1

Waterproof Handheld Meters

IQ160 pH Meter

IQ170 pH/mV/Temperature/Conductivity TDS/Salinity Meter

IQ340 Conductivity Meter

IQ350 Conductivity/TDS/Salinity Meter

2

Conductivity Calibration Quick Start Guide

Model IQ170, IQ340 and IQ350

Connect probe to meter. Put probe in first cali-brating solution.

Press ON/OFF to turn on meter.

If necessary, press CON until COND icon is seen on the display.

Press CAL. The conductivity value will flash. Press the ▲ or ▼ key until the display matches the calibrating solution.

Press ENTER Rinse probe in deionized water and place in sample.

1

pH Calibration Quick Start Guide

Model IQ160 and IQ170

Connect probe to me-ter.

Put probe in first calibrating buffer.

Press ON/OFF to turn on meter.

If necessary, press pH until pH icon is seen on the display.

Press CAL. If necessary, press the ▲ or ▼ key until display matches first buffer value.

Press ENTER and wait until the large number display stops flashing.

When complete, meter will display the next stored buffer value. CAL 2 will be displayed

Rinse probe in deion-ized water and place in second calibrating buffer.

If necessary, press the ▲ or ▼ key until display matches second buffer value.

Press ENTER and wait until the large number display stops flashing.

Rinse probe in deionized water and place in sample.

1

2

INTRODUCTION

IMPORTANT NOTICE SAFETY PRECAUTIONS

IF THE METER IS USED IN A MANNER OTHER THAN AS DESCRIBED,

THE SAFETY AND PERFORMANCE OF THE METER CAN BE IMPAIRED.

IF THE SEAL ON THE BACK OF THE METER IS TAMPERED WITH, THE

WARRANTY IS IMMEDIATELY VOIDED.

The IQ160 pH meter and IQ170 multi-parameter meter accept both traditional style glass sensor electrodes with BNC connectors and non-glass pH probes with ISFET (Ion Sensitive Field Effect Transistor) silicon chip sensors. The IQ170 multi-parameter meter, and the IQ340 and IQ350 meters accept conductivity probes. Throughout this manual, non-glass pH probes with silicon chip sensors will be referred to as “ISFET” probes. Glass sensor pH electrodes will be referred to as “BNC” probes. The pH meters have a standard BNC connector for attachment of glass sensor pH electrodes and a separate connector for ISFET probes. The pH meters are designed to use only one pH electrode (either a BNC pH probe or an ISFET pH probe) at a time. The meter automatically identifies which type of electrode is attached when the meter is turned on. If both ISFET and BNC probes are attached at the same time, errors may occur. Always turn off the meter when changing electrodes. NOTE: Both pH and conductivity probes can be attached simultaneously to the model IQ170.

ESTIMATED LIFE OF AN ISFET SENSOR pH PROBE

Depending upon the application, the expected life of an ISFET probe is approximately 18 months. The reference electrode contains a KCl gel, which becomes increasingly diluted with usage and time. The reference is sealed and is not refillable. When it becomes difficult to calibrate (pH buffer value does not stop flashing during calibration or takes an excessively long time to stop flashing), the probe should be replaced. A probe that is dirty, miscalibrated, or has reached the end of its useful life will give an error message E06 on the meter display. Your ISFET probe is warranted to be free from manufacturing defects for six (6) months from the date of purchase.

3

Table of Contents

Quick Start Guide — Conductivity Calibration. . . . . . . . . . . . . . . . . . . . . i Quick Start Guide — pH Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Section 1: Techniques and Tips for Best Performance. . . . . . . . . . . . . . . 4

Section 2: Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Section 3: Instrument Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Section 4: Keypad Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Section 5: Probes and Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Section 6: Probe Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Section 7: pH Calibration (Model IQ160 and IQ170 Only). . . . . . . . . . . . . 22

Section 8: Conductivity and TDS Calibration (Model IQ170, IQ340, and IQ350 only). . . . . . . . . . . . . . . . . . . . . . . . .

26

Section 9: Setup Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

pH Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2 or 3 Point pH Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Stabilization Lock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Temperature Display in oC or oF. . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Manual Temperature Compensation for Glass Electrodes. . . . . . . . . . . 35

Conductivity Temperature Compensation Coefficient. . . . . . . . . . . . . . 37

Reviewing Conductivity and TDS Calibration Points. . . . . . . . . . . . . . . 38

Conductivity Temperature Normalization . . . . . . . . . . . . . . . . . . . . . 40

TDS Conversion Factor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Setting TDS Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Setting Salinity Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Sound. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Clear Glass pH, Conductivity, and TDS Calibration Points. . . . . . . . . . . 48

Section 10: Troubleshooting Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Section 11: Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Conductivity Probe Cell Constants. . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Meter Automatic Shutoff Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

4

SECTION 1: Techniques and Tips for Best Performance

DO DO: (ISFET non-glass probe ONLY) Soak the probe in pH 7.00 buffer for at least five minutes if the probe is new or has been stored dry for an ex-tended period. This will hydrate the sensor and dissolve any reference mate-rial, which may have crystallized on the sensor surface. NOTE: If a probe is in regular use, pre-soaking is not necessary DO: (ISFET non-glass probe ONLY) Clean the probe regularly with a toothbrush and mild detergent. DO: (ISFET non-glass probe ONLY) STORE THE PROBE DRY with the black protective cap covering the probe tip. No electrode storage solution is re-quired. DO: (BNC probe ONLY) Store the probe in electrode storage solution. DO: Always begin each measuring session with a two-point calibration. Up-date often with one-point, two-point or three point calibrations. DO: Use fresh buffers and deionized rinse solution. DO: Use buffer solutions with pH values no greater than three pH units apart. Buffers should bracket the anticipated values of the samples to be measured. DO: Use deionized water to rinse residual buffer and sample solutions from the probe after calibration and measurement. DO: Calibrate at the same temperature as the sample solution. Although the meter has automatic temperature compensation, best results will be achieved if the calibration buffers and sample are the same temperature. DO: Keep the connectors clean and dry. Dirty or damp connectors can cause unstable readings.

5

DO NOT DO NOT: change pH probe types (switch between BNC and ISFET probes) while the meter is turned on. Always turn off the meter before changing probes. DO NOT: simultaneously use ISFET and BNC probes. Only have one type of probe attached to the pH meter at a time. NOTE: Both pH and conductivity probes can be simultaneously attached to the IQ170 multi-parameter meter. DO NOT: store an ISFET probe in solution or use for long-term pH measuring applications. Unlike BNC electrodes, stainless steel ISFET electrodes should be stored dry. Extended immersion will shorten the life of the probe. DO NOT: leave an ISFET probe uncapped for long periods of time. Always place the protective cap over the probe tip when finished measuring. DO NOT: allow oil, fat, food particles, starch, protein, or other materials to remain on the probe tip after use. DO NOT: use a sharp metal object (needle, pin, etc.) to clean the sensor surface. DO NOT: take readings in direct sunlight. Direct sunlight may cause unsta-ble readings or difficulty in calibration. Call IQ Scientific Instruments or your Authorized Dealer for optional light shields. DO NOT: use the probe in an environment that will damage the sensor, such as hydrofluoric acid or abrasive samples. DO NOT: use the probe in environments that will damage the epoxy materi-als used in the probe tip. Avoid acetone, toluene, methylene chloride, xylene, and other strong organic solvents. DO NOT: use in environments with static electricity. Electrostatic discharge may permanently damage the probe. DO NOT: expose the ISFET probe to repeated temperature extremes (60 oC or higher). Do not use the probe for applications that require the probe to cycle between hot and room temperature samples. DO NOT: put any other active measurement devices in buffers or samples while measuring pH or conductivity. Even if another device is not actually turned on, AC power interference can still occur.

6

SECTION 2: Specifications

Tab

le 1

: S

peci

fica

tion

s

pH

m

V

Tem

pera

ture

C

ondu

ctiv

ity

TD

S

Salin

ity

Ran

ge

0.00

– 1

4.00

A

utor

angi

ng

± 19

9.9

mV

± 19

99 m

V

-5.0

to

105

.0 °C

20

.0 to

199

.9 °F

A

utor

angi

ng

0.00

to 1

9.99

µS

20.0

to 1

99.9

µS

200

to 1

999

µS

2.00

to

19.9

9 m

S 20

.0 t

o 19

9.9

mS

Aut

oran

ging

0.

00-9

.99

ppm

10.0

-99.

9 pp

m

100-

999

ppm

1.

00-9

.99

ppt

10.0

-99.

9 pp

t 10

0-20

0 pp

t

Will

als

o di

spla

y in

mg/

L 0.

00-1

99.9

mg/

l 20

0-19

99 m

g/l

2.00

-19.

99 g

/l 20

.0-5

0 g/

l

0-42

ppt

Res

olut

ion

0.01

pH

A

utor

angi

ng

0.1

and

1

0.1

°C

0.1

°F

0.01

µS

0.1

µS

1 µS

0.

01 m

S 0.

1 m

S

0.01

ppm

0.

1 pp

m

1 pp

m

0.01

ppt

0.

1 pp

t 1

pt

0.1

mg/

l 1

mg/

l 0.

01 g

/l 0.

1 g/

l

0.1

ppt

Acc

urac

y ±0

.01

pH

±0.1

mV

±0

.5 °C

±

1% fu

ll sc

ale

or ±

1 di

git

± 1%

full

scal

e or

±1

digi

t +/

- 0.

1 pp

t (-

2 to

35

°C)

Cal

ibra

tion

Up

to th

ree

poin

ts

With

aut

omat

ic

buff

er re

cogn

ition

1.

68,4

.01,

6.8

6,

7.00

, 9.1

8, 1

0.01

, 12

.45

Non

e O

ffse

t in

0.1

°C

incr

emen

ts

Up

to fi

ve p

oint

s U

p to

five

poi

nts

Non

e (d

eriv

ed fr

om

cond

uctiv

ity)

7

Sound: Sounds will occur as follows:

• Three short beeps any time measurement stability is reached during calibration mode, regardless of the Stabilization Lock setting.

• Three short beeps when stabilization is reached when in Stabilization Lock ON mode. The READY icon will illuminate. (NO beep if Stabilization Lock is in the OFF mode)

• Two long beeps if an error condition occurs. An error code will be displayed.

• Audible click on key tap. Automatic Ranging of mV Display From -199.9mV to +199.9mV the meter will display 0.1 resolution. From 200mV to 1999mV the meter will display 1 mV resolution. Automatic Ranging of Conductivity, TDS and Salinity values. Auto ranges between the five display ranges. Automatic Detection of Cell Constant. The meter will automatically detect the cell constant of a conductivity electrode. Auto Power off: Will automatically power off 20 minutes after last key press. LED Display Light: LED light goes on when the light button is pressed. Light stays on for 2 minutes after the last keystroke. Conversion factor for TDS: User adjustable.

8

Temperature Compensation:

Glass pH Temperature Compensation If the meter is in the glass pH mode and a temperature probe is plugged in to the 3.5mm phono jack, the meter defaults to Automatic Temperature Compensation (ATC). If no temperature probe is detected it defaults to Manual Temperature Compensation at 25 °C. ISFET pH Temperature Compensation ISFET pH is always automatically temperature compensated using the thermistor built-in to the probe. Conductivity Temperature Compensation The internal temperature sensor in the conductivity probe is used for conductivity temperature compensation. The Conductivity automatic temperature compensation coefficient is user selectable. Default is 2% per degree C.

NOTE ON pH ATC: Automatic Temperature Compensation (ATC) for pH only occurs when using an ISFET pH probe (built-in temperature sensor) or when a BNC pH electrode is used with the separate temperature plug attached. After calibration is complete and the meter is in the pH mode, the pH values displayed will be temperature compensated. If no temperature plug is attached when using a BNC electrode,

9

The table below shows the pH values of buffers at various temperatures.

Nominal Value

25 oC 0 oC 5 oC 10 oC 20 oC 30 oC 40 oC 50 oC

1.68 1.67 1.67 1.67 1.67 1.68 1.69 1.71

4.01 4.00 4.00 4.00 4.00 4.01 4.03 4.06

6.86 6.98 6.95 6.92 6.87 6.85 6.84 6.83

7.00 7.12 7.09 7.06 7.01 6.99 6.97 6.97

9.18 9.46 9.40 9.33 9.23 9.14 9.07 9.02

10.01 10.32 10.25 10.18 10.06 9.97 9.89 9.83

12.45 13.42 13.21 13.00 12.63 12.29 12.04 11.70

Table 2: Temperature Compensation Tables

10

13 12

14 15

16

1

2 3 4

5

22

6 7

9

11

17 18

19

20

21

23

SECTION 3: INSTRUMENT FEATURES Display Features

Item No.

Description IQ160 IQ170 IQ340 IQ350

1 ISFET probe indicator. ISFET is displayed when the meter has detected the presence of an ISFET probe. (Model IQ160, Model IQ170)

• •

2 Indicates that the meter is receiving input from the pH probe. Will be displayed in both pH and mV reading modes. (Model IQ160, Model IQ 170)

• •

3 The meter is in the Conductivity reading mode (Model IQ170, IQ340, IQ350)

• • •

4 The meter is in the Salinity reading mode (Model IQ170, Model 350)

• •

5 The meter is in the TDS reading mode (Model IQ170, Model IQ350)

• •

6 TDS or Salinity value is in mg/L or g/L (Model IQ170, IQ350)

• •

7 TDS or Salinity value is in ppm (Model IQ170, IQ350)

• •

8 TDS or Salinity value is in ppt (Model IQ170, IQ350)

• •

9 The displayed value is a mV value • •

10 The displayed value is a pH value • •

11 The Conductivity value is in mS • • •

10

8

11

12 The Conductivity value is in µ S • • •

13 The Salinity value is in % • •

14 The pH, Conductivity, TDS or Salinity value is automatically temperature compensated.

• • • •

15 Indicates the meter is in a calibration mode. When calibrating pH, indicates the current point of a multiple point calibration.

• • • •

16 The Temperature value is in oF • • • •

17 The Temperature value is in oC • • • •

18 Low battery power indicator • • • •

19 Meter is in SETUP mode • • •

20 Temperature value • • • •

21 Main Display value • • • •

22 Stable reading (Endpoint) in pH, Conductivity, TDS or Salinity

• • • •

23 The display is in HOLD mode • • • •

Item No.

Description IQ160 IQ170 IQ340 IQ350

12

Model IQ170 shown

SECTION 4: Keypad Functions

13

Table 4: Keypad Functions

Key Action

ON/OFF Turns on/off meter

pH Displays pH

mV Displays mV

Light Turns on light for two minutes

TDS Displays estimated TDS. If no Conductivity probe is attached, will not go into TDS mode.

COND Displays Conductivity. If no Conductivity probe is attached, will not go into conductivity mode.

SAL Displays Salinity. If no Conductivity probe is attached, will not go into Salinity mode.

HOLD Toggles HOLD mode. Readings “frozen” until HOLD key pressed again to release display. Only operates in measurement modes.

CAL Puts into the pH calibration mode. If the meter is in the Conductivity or TDS mode it will put it in the Conductivity or TDS calibration mode.

▲ Scrolls pH buffer values when in pH calibration mode. Scrolls values in COND or TDS calibration mode. Used to view setup screens.

▼ Scrolls pH buffer values when in pH calibration mode. Scrolls values in COND or TDS calibration mode. Used to view setup screens.

SETUP Enters setup mode

ENTER Used to confirm values to begin calibration.

IQ160

•

•

•

•

•

•

•

•

•

•

IQ170

•

•

•

•

•

•

•

•

•

•

•

•

•

IQ340

•

•

•

•

•

•

•

•

•

IQ350

•

•

•

•

•

•

•

•

•

•

•

14

SECTION 5: Probes and Connections

IQ170 multi-parameter meter

1. Conductivity probe connector

2. BNC Connector for glass pH electrode

3. Phono jack for glass pH elec-trode temperature sensor

4. ISFET pH probe connector

Connector dust caps

IQ160 pH Meter

IQ340 and IQ350 Conductivity Meters

CAUTION: Do not operate meter with both an ISFET and a BNC probe attached.

15

Probe connections Glass and ISFET pH probes The Model IQ160 and IQ170 meters accept two different types of pH sensing technologies, ISFET pH probes and glass electrodes (BNC probes). The meters automatically identify whether a BNC or ISFET pH probe is attached when the meter is first turned on. Do not attach both types of pH probe at the same time. The meter is designed to use only one type of pH probe at a time. Always turn off the meter when changing probes. pH and Conductivity Probes The Model IQ170 multi-parameter meter allows both a pH probe (either glass or ISFET) and a conductivity probe to be connected simultaneously.

1. Conductivity Probe.

The IQ170, IQ340 and IQ350 meters accept conductivity probes of different cell constants. The cell constant is automatically detected by the meter.

2. BNC Connector for Probes.

The IQ160 and IQ170 multi-function meter accepts any pH, ORP, or Ion Selective Electrode with BNC connector. Be sure that both the receptacle on the meter and the connector on the probe are clean and dry; wet or dirty connections may cause unstable readings.

3. Temperature Probe Connector for use with BNC Probes. The temperature probe uses a 3.5 mm phono jack. When a temperature probe is connected, the meter will Automatically Temperature Compensate (ATC) pH values. Contact IQ Scientific Instruments for temperature probes or pH electrodes with built-in temperature sensors.

4. ISFET pH Probe Connector.

The Model IQ160 and IQ170 multi-function meter accepts ISFET non-glass pH probes. The temperature sensor is built-in to the ISFET probe so a separate temperature probe is not required

16

The ISFET probe connector and conductivity probe connector are keyed differently to prevent attaching a probe to the wrong connector. All of the connectors, including the 3.5mm phono jack are sealed to protect flooding of the interior meter in the event of submersion. NOTE: If the meter is submerged, the interior of the 3.5mm phono jack may fill with water although the interior of the meter itself is sealed. If the 3.5 mm phono jack is flooded, it must be dried immediately. Best solution is to invert the me-ter to allow any water to run out of the connector. Automatic pH Probe Detection (Model IQ160 and IQ170 only). If the instrument does not detect the presence of an ISFET probe, it defaults to glass pH electrode mode and reads pH from the BNC connector. Automatic Conductivity Probe Detection (Model IQ170, IQ340 and IQ350): If a conductivity probe is detected, conductivity measurement and calibration is enabled. The cell constant of the conductivity probe is automatically detected. The following cell constants are recommended for the following applications: Automatic Detection of Cell Constant. (Model IQ170, IQ340 and IQ350). The meter will automatically detect the cell constant of a conductivity electrode. No user setup is required.

17

Temperature probe for use with glass pH (Model IQ160 and IQ170): IQ Scientific Instruments BNC probes have a built-in temperature sensor and the probe cable has a “Y” with a BNC connector and a 3.5mm phono jack. If the instrument detects the presence of a temperature probe plugged into the 3.5mm phono jack, the meter defaults to ATC for the glass pH measurement. ISFET pH: IQ Scientific instruments’ silicon chip pH sensor (ISFET) probes have a built-in temperature sensor. If an ISFET pH probe is detected, the BNC and the 3.5mm phono jack are disabled and the ISFET probe pH measurement and calibration is enabled. The internal temperature sensor in the ISFET probe is used for pH temperature compensation. ISFET pH is always automatically temperature compensated (ATC).

Cell Constant (k) Recommended Range Application Notes

K 0.3 0 to 100,000 µS General purpose. Dirty samples.

Altem body, anti-fouling flush tip. Stainless steel contacts

K 0.5 0 to 100,000 µS General purpose Graphite body.

K 1 0 to 120,000 µS High accuracy Glass body, platinum bands

K10 0 to 200,000 µS High conductivity samples, brackish water, seawater

Epoxy body, platinum bands

Table 5: Cell Constants

18

SECTION 6: Probe Cleaning

Cleaning and Reconditioning ISFET (non-glass) Probes Recommended cleaning solution for any probes used in samples containing protein: IQ Scientific Instruments pepsin-based cleaning solution, Part #PCS50. Cleaning with Detergent

CAUTION: Do not use metal objects such as pins or paperclips to clean the sensor. The sensor can be permanently damaged with aggressive abrasion of the sensor surface.

Reconditioning with Warm Buffer

ISFET probes are designed to be stored dry and have a virtually unlimited shelf life; however an extended period of

dry storage can crystallize the KCl gel at the reference junction. Heat pH 7.00 buffer to between 45 oC and 60 oC

(115 oF and 140 oF). Soak the probe for 2 minutes. Place the probe in room temperature pH 7.00 buffer and allow to cool.

CAUTION: Do not use the probe as a thermometer to determine if the buffer is above 60 oC. Sudden immersion in excessively hot water may permanently damage the probe.

19

Cleaning With Alcohol or Methanol The ISFET sensor (recessed shiny blue-green spot in the side of the probe near the tip) can be gently cleaned using alcohol or methanol and a wooden toothpick tipped with a small amount of cotton wool. Be sure that the cotton tip is small enough to actually make contact with the recessed sensor.

CAUTION: Cleaning with alcohol is not recommended if the sample you are testing contains proteins. Use IQ Scientific Instruments Pepsin-based Probe cleaning solution Part #PCS50

Cleaning with Pepsin (Protein Deposit Removal) Digest proteins by soaking for 15 minutes to one hour in Probe Cleaning Solution, available from IQ Scientific Instruments as item #PCS50. Rinse well with deionized water.

Cleaning with Sodium Hypochlorite (Bleach)

If the ISFET probe has been exposed to fat or protein, the response time may begin to slow. Soak the probe for five minutes in a 10:1 dilution of deionized water to household

bleach (0.5% solution of sodium hypochlorite). Brush with a soft bristle brush or toothbrush to remove deposits. The

sensor is slightly recessed, be sure to make gentle contact with the sensor surface. Rinse well with deionized water.

CAUTION: Do not soak the probe in sodium hypochlorite for more than 5 minutes. Extended immersion will permanently damage the probe.

20

Cleaning and Reconditioning BNC (Glass Sensor) Electrodes

Cleaning with Detergent Vigorously stir the BNC probe in a solution of warm water and detergent (a few drops of dish detergent in a cup of warm water) for 5 minutes. Rinse well with deionized water. Reconditioning with Warm Buffer Many glass sensor problems are related to the reference junction. If using a BNC pH electrode with a gel filled reference, the reference can be reconditioned by soaking in 60 oC (140 oF) pH 4.00 buffer with added KCl for ten minutes. Place the probe in room temperature electrode soak solution (pH 4.00 buffer with added KCl) and allow it to soak for 30 minutes. Cleaning with Acid Soak the BNC probe for 30 minutes in 0.1 molar HCl (about a 100:1 dilution of distilled water to 37% hydrochloric acid).

Rinse well, then soak in pH 4.00 buffer for 30 minutes.

CAUTION: When mixing acid, wear protective clothing and eyewear. Al-ways add acid to water-- NOT water to acid.

21

Cleaning with Pepsin (Protein Deposit Removal) Digest proteins by soaking for 15 minutes to one hour in Probe Cleaning Solution, available from IQ Scientific Instruments as item #PCS50. Rinse well with deionized water. Etching with Ammonium Biflouride (DO NOT ETCH ISFET PROBES) This is generally considered the method of last resort. If the BNC electrode response is still sluggish after trying other cleaning methods, immerse electrode tip in 0.1M NH4HF2 (ammonium biflouride) for one minute. This is a solution of about 5.7 grams ammonium biflouride to 1 liter of distilled water. This will etch the surface of the glass and may restore performance. Rinse well with deionized water. Soak the probe overnight in pH 4.00 buffer.

CAUTION: This solution is extremely hazardous. Protective clothing and eyewear must be worn. Dispose of used solution properly.

22

Section 7: pH Calibration MODEL IQ160 and IQ170 only

One, two or three point calibration procedure for pH.

1. Press pH to put in pH mode.

2. Place probe in first buffer solution. Press CAL. The

Cal 1 icon will begin flashing.

23

3. If the buffer is correctly identified, press ENTER. CAL

1 will stop flashing and the pH buffer value will flash until calibration is complete.

NOTE: Calibration can be aborted while the pH value is flash-ing by pressing the pH key.

4. If pH buffer is incorrect, press the ▲ or ▼ key to select

another buffer. Repeatedly pressing will display the choices of available buffers 1.68, 4.01, 6.86, 7.00, 9.18, 10.01, 12.45 (if on CAL 2 or CAL 3 the meter omits the values already used in previous calibrations).

5. When calibration is complete, meter will beep three

times, and the display will show a flashing CAL2 and the next pH value (default is 4.01).

24

6. Press Enter if OK, or ▲ or ▼ to change value, press pH to accept just a 1 point calibration and display pH measurement mode.

7. If ENTER is selected, CAL 2 will stop flashing and the

buffer value will start flashing until calibration is complete.

8. If the meter is set for only a two point calibration,

upon completion of the second point the meter will beep three times and the display will return to the pH measurement mode. If the meter is set up for three point calibration (see SETUP modes) the display will show a flashing CAL 3 and the next pH value (default is 10.01).

25

9. IF SETUP FOR 3 POINT CALIBRATION: Press Enter if

OK, or ▲ or ▼ to change value, press pH to accept just a 2 point calibration and display pH measurement mode.

10. If ENTER is selected, CAL 3 will stop flashing and the

buffer value will start flashing until calibration is complete.

11. When done with the third calibration point, calibration

is complete and the meter will beep three times and the meter is ready to begin reading the pH value of any solution.

26

SECTION 8: Conductivity and TDS Calibration Model IQ340: Conductivity Model IQ170 and IQ 350: Conductivity and TDS. Salinity derived from conductivity. Conductivity and TDS Calibration The meter can be calibrated with up to five calibration points. If a calibration point is greater than 20% of a previously stored calibration point, the previously stored calibration point will be retained and a new calibration point will be saved. If the calibration point is less than 20% of a previously stored calibration point, the closest stored calibration point will be replaced. If five calibration points are already stored, the closest stored calibration point will be replaced with the new calibration data. The meter can be calibrated with either Conductivity or TDS standards (TDS function is only found in the Model IQ170 and IQ350). Stored calibration points can be reviewed in SETUP. All calibration data can be cleared using the RESET function. Note: The meter defaults to a temperature compensation coefficient of 2% per C. The coefficient is user selectable in SETUP. Note: Calibration is automatically cleared if the conductivity probe is changed to a probe of a different cell constant. 1. Press COND to put in Conductivity mode or press TDS

to put in TDS mode. 2. Place probe in first standard solution. Meter will begin

reading the conductivity value. 3. Press CAL. The main display value will begin flashing.

27

4. Press the ▲ or ▼ key to scroll to the value of the conductivity or TDS standard.

5. When the correct value is displayed, press ENTER to store the calibration. The meter is ready to begin reading the conductivity or TDS value of any solution.

NOTE: At any time during the calibration you may exit the

calibration mode by pressing the CON button. The meter will keep the old calibration data.

6. If you wish to have multiple calibration points , repeat

steps 1-5 for up to five calibration points Note: Calibrating the meter in the conductivity mode also

calibrates a corresponding TDS value (IQ170 and IQ350). Calibrating in TDS mode calibrates a corresponding conductivity value.

28

SECTION 9: Setup Functions

General Navigation for setup options:

1. Press SETUP to start or exit Setup mode. 2. Press the ▲ or ▼ keys to scroll to the setup

option you want to change. 3. Press ENTER to indicate you want to change

this setting. 4. Press the ▲ and ▼ keys until the setting you

want to use appears on the display. 5. Press ENTER to store the new setting in

memory. Setup is only available in measurement reading modes. Setup is disabled during calibration.

29

TABLE 6: SETUP FUNCTIONS

SETUP MODE IQ160 IQ170 IQ340 IQ350

pH Resolution — • • pH Calibration— • • pH stabilization lock • • Display Temperature • • • • Glass pH manual temperature compensation

• •

Conductivity/TDS temperature compensation coefficient

• • •

Conductivity temperature normalization

• • •

TDS Conversion Factor • • TDS units • • SAL units • •

Sound • • • •

Clear all pH, conductivity, and TDS calibration points

• • •

OPTIONS

0.1 or 0.01 Default: 0.01

2 or 3 point Default: 2 point

ON or OFF Default: ON

C or F Default: C

User selectable Default: 25 C

User selectable Default: 2% per degree C

20 C or 25 C Default: 25 C

User selectable Default: 0.5

mg/L or ppm Default: mg/L

ppt or % Default ppt

ON or OFF Default: ON

No or Yes Default: No

Review conductivity and TDS calibration values

View stored calibration values

• • •

Conductivity probe cell constant

Shows cell constant value. .000 if no probe

• • •

1

2

3

4

5

6

7

8

9

10

11

12

13

15

14 Meter automatic shutoff time

Shutoff time in minutes. 1 to always on Default: 20 min

• • • •

30

1. Setting pH Resolution: 0.1 pH or 0.01 pH pH can be displayed in two resolutions 0.1 pH or 0.01 pH Default mode is 0.01 To select resolution 1. Press SETUP to put in the setup mode. 2. Press the ▲ or ▼ until the pH resolution setup screen is

displayed.

3. Press ENTER. The display will show the pH

resolution

Pressing the ▲ or ▼ keys will toggle between 0.01 and 0.1 resolution

4. Use the ▲ or ▼ to set the pH resolution 5. Press Enter to save changes and return to

SETUP MODE

31

3. Press ENTER. The display will show the current Calibration points

Pressing the ▲ or ▼ keys will toggle between CAL 2 CAL 3

4. Use the ▲ or ▼ to set calibration points

(options are 2 or 3 points) 5. Press Enter to save changes and return to

SETUP MODE

2. Setting Up for 2 point or 3 Point pH Calibration To select number of calibration points. Default is 2 point 1. Press SETUP to put in the setup mode. 2. Press the ▲ or ▼ until the pH calibration point setup

screen is displayed.

32

3. Setting Stabilization Lock ON or OFF pH, conductivity, and TDS can be displayed with a Stabilization Lock mode. When a stable reading is reached, the display locks on the value and the meter ignores very slight changes in the measurement. The “Ready” icon turns on when an endpoint is reached and the Stabilization Lock is active. The display automatically unlocks after a significant measurement change is detected. When performing titrations or attempting to detect very slight changes, the Stabilization Lock should be OFF Default is Stabilization Lock ON Default is stable reading indication mode. 1. Press SETUP to put in the setup mode. 2. Press the▲ or ▼ until the Stabilization Lock screen is

displayed.

33

2. Press ENTER. The display will show the Stabilization Lock status.

Pressing the ▲ or ▼ keys will toggle stabilization lock ON or OFF

3. Use the ▲ or ▼ to set the Stabilization Lock mode 4. Press Enter to save changes and return to SETUP

MODE

34

4. Setting the Temperature Display to oC or oF Temperature can be displayed in oC or oF Default mode is oC To select temperature units 1. Press SETUP to put in the setup mode. 2. Press the ▲ or ▼ until the Temperature units setup

screen is displayed.

3. Press ENTER. The display will show the current units

4. Use the ▲ or ▼ to set the temperature units 5. Press Enter to save changes and return to SETUP

MODE

35

5. Manual Temperature Compensation for Glass Electrodes

Glass electrodes are automatically temperature compensated if a temperature probe is detected in the 3.5mm phono jack. If no probe is detected, the system defaults to manual temperature compensation at 25.0 oC. Manual temp compensation is always in oC (No oF conversion is necessary) 1. Press SETUP to put in the setup mode. 2. Press the ▲ or ▼ until the Manual Temp screen is

displayed.

3. Press ENTER. The display will show the Manual Temp value

Pressing the ▲ or ▼ keys will scroll the temperature compensation value up or down

36

4. Use the ▲ or ▼ to set the manual temp

compensation 5. Press Enter to save changes and return to

SETUP MODE

37

6. Conductivity Temperature Compensation Coefficient

Conductivity is automatically temperature compensated. Default is 2% per oC. The user selectable range is 0-10%. No oF conversion is required. 1. Press SETUP to put in the setup mode. 2. Press the ▲ or ▼ until the Conductivity Temperature

Compensation Factor screen is displayed.

3. Press ENTER. The display will show the Conductivity temperature compensation factor.

4. Use the ▲ or ▼ to set the compensation coefficient 5. Press Enter to save changes and return to SETUP

MODE

38

7. Reviewing Conductivity and TDS Calibration Points

The meter will show the calibration points of up to five calibration points. The display will indicate either “ppm” , “ppt” , “mg/l”, “µS” , or “mS” depending upon whether the meter was calibrated in the conductivity or TDS mode. 1. Press SETUP to put in the setup mode. 2. Press the ▲ or ▼ until the Review Conductivity and TDS

Calibration Values screen is displayed.

NOTE: If the Conductivity to TDS conversion factor has been changed after calibration, any stored TDS calibration points will be adjusted by the new conversion factor. Recalibration is recommended after any changes made to the conversion factor.

39

3. Press ENTER. The display will show the value each

calibration point.

If no calibration points are stored, this screen will be displayed

4. Use the ▲ or ▼ to scroll through calibration points 1

thru 5 5. Press Enter to return to SETUP MODE

40

8. Conductivity Temperature Normalization Conductivity varies greatly with temperature. The conductivity Automatic Temperature Compensation (ATC) adjusts conductivity measurements to factor out the conductivity changes in the reading caused by temperature. The readings are referenced to or “normalized” at a standard temperature. The options are 20 oC or 25 oC. The ATC will give the equivalent conductivity or TDS of a solution normalized at 20 oC or 25 oC. Default 25 oC 1 Press SETUP to put in the setup mode. 2. Press the ▲ or ▼ until the Conductivity Temperature

Normalization screen is displayed.

3. Press ENTER. The display will show the Conductivity

normalization value.

41

4. Use the ▲ or ▼ to toggle 20.0 oC and 25.0 oC 5. Press Enter to return to SETUP MODE

42

9. Setting the TDS Conversion factor TDS values are related to conductivity. The operator can calibrate using a TDS standard or calibrate using conductivity standards then program the meter with a conversion factor. The range is .40 to 1.00. The default is .50 To set the TDS conversion factor: 1. Press SETUP to put in the setup mode. 2. Press the ▲ or ▼ until the TDS conversion factor

screen is displayed.

3. Press ENTER. The display will show the current

conversion factor

4. Use the ▲ or ▼ to set the conversion factor. 5. Press ENTER to save changes and return to SETUP

MODE

43

10. Setting TDS Units: mg/L (g/L) or ppm (ppt) TDS can be displayed in metric units mg/l (g/L) or ppm (ppt).

1. Press SETUP to put in the setup mode. 2. Press the ▲ or ▼ until the TDS units screen is

displayed.

3. Press ENTER. The display will show the TDS units.

Pressing the ▲ or ▼ keys will toggle between mg/L and ppm

4. Use the ▲ or ▼ to set the TDS units. 5. Press Enter to save changes and return to SETUP

MODE

44

11. Setting Salinity Units: ppm (ppt) or %

1. Press SETUP to put in the setup mode. 2. Press the ▲ or ▼ until the Salinity units screen is

displayed.

3. Press ENTER. The display will show the Salinity units

Pressing the ▲ or ▼ keys will toggle between ppm and %

4. Use the ▲ or ▼ to set the Salinity units. 5. Press Enter to save changes and return to SETUP

MODE

45

12. Conductivity Probe Cell Constant

This screen displays the cell constant of an attached conductivity probe. If no conductivity probe is attached, the display will read .000.

46

13. Sound ON/OFF 1. Press SETUP to put in the setup mode. 2. Press the ▲ or ▼ until the Sound icon is displayed

3. Press ENTER. The display will show the Sound status

(“on” or “off”)

4. Use the ▲ or ▼ to toggle ON or OFF. 5. Press Enter to save changes and return to SETUP

MODE

47

14. Meter Automatic Shutoff Time The meter will shutoff automatically to conserve battery power after a predetermined period of time. Range 1 minute to always on. Default: 20 minutes. 1. Press SETUP to put in the setup mode. 2. Press the ▲ or ▼ until the Meter Automatic Shutoff

Time screen is displayed.

3. Press ENTER. The display will show the number of

minutes until the meter automatically shuts off.

4. Use the ▲ or ▼ to set the shutoff time in minutes. Set

to 0 for continuously on. 5. Press Enter to save changes and return to SETUP

MODE

48

15. Clearing Glass pH, Conductivity, and TDS Calibration points

1. Press SETUP to put in the setup mode. 2. Press the ▲ or ▼ until the Clear All Calibration Points

screen is displayed.

3. The meter will prompt if you want to clear all calibration points. The default is “No”. Press the ▲ or ▼ key to toggle to “Yes” and then press ENTER to clear.

NOTE: This procedure DOES NOT clear calibration data for an

ISFET probe.

Pressing the ▲ or ▼ keys will toggle from No to YES

49

SECTION 10: Troubleshooting Guide

INDICATION CAUSE USER ACTION

No Display. Auto Power Off has cleared display.

Press Power button.

No Power. Replace AA batteries in meter

Unstable reading. Dirty probe. Follow the probe cleaning procedures described in this manual.

Dirty probe/meter connectors.

Clean probe contacts on probe cable connector and on meter with methanol and a cotton swab and let dry completely. Reconnect probe to meter.

Reference junction not flowing.

Follow warm buffer cleaning procedure.

ISFET probe not properly hydrated.

Soak probe for at least five minutes in pH 7.00 buffer.

Interference from other devices.

Remove other devices from solution. Unplug water baths, stirrers, etc.

Interference from direct sunlight.

If working outside, shield the probe from direct sunlight.

Probe is in a very low ionic strength solution.

Stable reading may not be possible.

pH or temperature of solution is changing.

Stable reading not possible until pH and temperature is constant.

50

Trouble calibrating. Display does not stop flashing during calibration.

Probe sensor surfaces are dirty or probe needs reconditioning.

Follow cleaning and reconditioning instructions.

Reference junction not flowing.

Follow warm buffer cleaning procedure.

Buffers may be contaminated or expired.

Recalibrate with fresh buffers.

Interference from other devices in solution. Such as improperly grounded stirrers, water baths, or other devices.

Remove any other devices from solution. Unplug water baths, stirrers, or any other electrical devices near the probe.

Battery is low. Replace batteries if the battery icon indicates low battery power.

Interference from direct sunlight.

Shield probe from sunlight.

If trouble persists, probe may have reached the end of its useful life and may need to be replaced.

Replace probe.

INDICATION CAUSE USER ACTION

51

INDICATION CAUSE USER ACTION

Meter continually displays 14.00 or 0.00 with electrode attached. ISFET icon not displayed when ISFET probe is attached

Presence of ISFET probe not detected by meter or probe

Turn on the meter. If the ISFET icon is not displayed, replace ISFET probe.

Out of calibration. Carefully follow two point calibration instructions.

Probe not in solution. Place probe in liquid. Gently shake probe to be sure no air bubbles are trapped on the sensor surface.

No probe attached. Turn off meter. Attach pH probe. Turn on meter.

Dirty probe. Follow cleaning instructions.

Damaged probe. If problem persists, replace probe.

52

SECTION 11: Error Codes

ERROR CODE CAUSE USER ACTION

E03 Glass electrode offset error.

E03 is displayed if the mV reading in pH 7.00 buffer is greater 0.000 mV ±30 mV.

An offset error indicates poor pH electrode condition. Follow cleaning instructions.

If E03 persists, replace electrode.

E04 Glass electrode slope error

E04 is displayed if the glass electrode slope is less than 85% or over 102% of 59.16 mV per pH unit.

An slope error indicates poor pH electrode condition. Follow cleaning instructions.

If E04 persists, replace electrode.

Override E04 by pressing the pH key for temporary use of a damaged electrode

53

E06 ISFET electrode slope error

EO6 is displayed if the ISFET slope is out of out of specification and indicates poor electrode condition or damaged probe. Follow cleaning instructions.

If EO6 persists, replace electrode

EO8 Too long to calibrate

Calibration over 4 minutes. Follow cleaning instructions. Use IQ Scientific Instruments Probe Cleaning Solution Part#PCS50.

If E08 persists, replace electrode

E13 ISFET probe temperature sensor out of range

Replace electrode

E20 Conductivity probe temperature sensor out of range

Replace electrode.

ERROR CODE CAUSE USER ACTION

54

Technical Support

On-line: www.pHmeters.com Toll Free (U.S.A. and Canada): 1-800-276-0723

Telephone: 760-930-6501 FAX: 760-930-0615

IQ Scientific Instruments, Inc. 2075-E Corte del Nogal Carlsbad, CA 92011 U.S.A.

Copyright © 2005 IQ Scientific Instruments, Inc.

Revision 1.32