INW SENSOR TECHNOLOGY

Future Ready

Sensor History at INWAnalog

PressureSensors

1985

AnalogpH & ISESensors

1995

Smart PressureSensors 2002

Smart pH & ISESensors 2006

SDI-12/MODBUS Sensors 2008

Smart Conductivity

Sensors2006

INW has been making sensors since 1985

What we will cover

Overview INW Analog sensors INW Digital Sensors INW Smart Recording Sensors INW Wavedata Wireless: Real time data

collection Meeting the USGS-HIF Requirements!

INW Analog Sensors

Analog Sensors

PS9800 Pressure Temperature Sensor

-4-20 mA output

-high accuracy .1% FSO

-thermal calibration

-submersible

-modular design : field servicable

-upgradeable to INW smart sensors: Pt2X

Analog Sensors

PS98i

- 4-20 mA

-Submersible

-0.1% FSO accurate

-Modular (field servicable sensor or cable harness

-upgradeable to 2 –protocol sensors with no internal AA’s.

SDI 12/Dual Protocol Sensor: Sdi12 or Modbus Digital

SDI12 Modbus Highly Temperature Compensated Low Power Absolute, Gauge, Wet-Wet differential Non-recording Competitive Price Upgradeable to Smart Recording Pt2X

INW Smart Recording Sensors

Common Features

Smart Sensors: Common Features

Recording from 1 to 4 mb Non-volatile Records in files, old files can be retained up to

memory limit Can upload files without stopping recording Can measure and record simultaneously

Smart Sensors: Common Features

Great for stand alone data collection and portable installations

User-replaceable, AA batteries, alkaline or lithium

Operate for a year without replacing batteries at 15 minute interval collection

Run on internal batteries: 3.0 or 3.6 VDC

Smart Sensors: Common Features

Allows for continuous operation

Switches off 3 volt supply so it becomes backup

Auxiliary power input : 5.5 – 15 VDC

Smart Sensors: General Features Modbus protocol: RS485

Programmable Baud rate 38,400 standard

Transmit data over radios and cell modems

Data accessible from the Internet

Network on 3-wire bus to 32 devices

Smart Sensors: General Features

SDI-12 output

Currently Implemented in CT2X-P and pt2x

Temphion has components and is sdi12 ready

T32 temp recorder is Sdi12 ready

GDL know includes sdi12 outputs

Smart Sensors: General Features

Digital Output Control line

Currently Implemented in Temphion for auto-sampling

Custom programmable if installed in firmware in other sensor models. Hardware is there!

Alarming and control

Smart Sensors: General Features Powerful Free utility Software

A4plus for general operation A4push for auto-network data

collection

Firmware Downloading

Allows for future improvements and features

General Features

Aqua4Plus General control Real time monitoring Recording data Calibration

Aqua4Push Gather data from

various sites and upload to FTP site

Powerful software

PT2X Smart PressureSensors

PT2X Smart Sensor & Datalogger

Pressure,Temperature & Time Absolute, gauge,wet-wet differential

or sealed gauge versions: Vented or Non vented!

Highly Thermally compensated Very Low power – two internal

AA batteries will record 500,000 records

Memory up to 520,000 records Small diameter – 0.75”

PT2X Smart Sensor & Datalogger

316 stainless or titanium Viton®, Delrin® and Teflon®

Variety of pressure ranges Networks with all INW Smart

Sensors Compatible with WaveData®

wireless data collection systems Cabled or Cableless

Cutaway View of PT2X

End cone

Smart Sensor circuit board

Top-cap/cable harness

Inlets 2 AA Size batteries Cable

Pressure Element

TempHion Smart pH/ISE/Redox

Sensors

TempHion Smart Sensor & Datalogger

pH / ISE / Redox & Temperature Thermally compensated Low power – two internal

AA batteries Over 65,000 records Small diameter – 0.75” Patented highly stable reference

electrode designed for long term monitoring

TempHion Smart Sensor & Datalogger

Solution ground for excellent noise protection

316 stainless steel Viton®, Delrin® and Teflon®

Networks with all INW Smart Sensors

Compatible with WaveData® wireless data collection systems

Cutaway View of TempHion

Solution ground and plated electrode (on other side)

Smart Sensor circuit board

Top-cap/cable harness

Patented reference electrode (inside)

Reference solution reservoir 2 AA batteries Cable

pH/Redox or Nitratemodule

Embedded Thermistor

TempHion Measurement Theory

The TempHion works on the principle of direct potentiometry—the same principle that governs any other pH or ISE electrode.

Two electrodes

Sensing electrode (button)

Reference electrode (in reservoir)

TempHion Measurement Theory

• Reference electrode immersed in filling solution of known chloride content. Chloride content stays constant as long as solution is not contaminated or diluted.

• Filling solution must be in contact with solution being tested to complete the electrical circuit.

Liquid junction port

Measurement Theory

• “Cell potential” is measured across the two electrodes.

• Potential of sensing electrode varies logarithmically with the concentration of the ion it senses.

• Aqua4Plus uses this reading and applies calibration and temperature compensation to arrive at highly accurate readings.

Sensing electrode

Reference electrode

CT2X Smart Conductivity/Pressure

Sensors

CT2X Smart Sensor & Datalogger

Conductivity & Temperaturewith Pressure optional

Low power – two internal AA batteries

Over 349,000 records Linear and nLFn temperature

compensation Small diameter – 0.75” 316 stainless or titanium Viton®, Delrin® and Teflon®

CT2X Smart Sensor & Datalogger

10 μS/cm to 100,000 μS/cm Variety of pressure ranges Absolute, gauge, or sealed gauge Networks with all INW Smart

Sensors Compatible with WaveData®

wireless data collection systems

Cutaway View of CT2X

Optional pressure module

Conductivity probe

Circuit board

2 - AA Batteries

Cableharness

CT2X Measurement Theory

Epoxy/Graphic probe Durable Easy to clean with cotton swap or small brush

4-pole electrode Reduces fringe field interference Lessens errors caused by polarization effects Lowers contact resistance problems Allows one electrode to work over wide range of

conductivity

INW Technology

GDL:

General Data Logger

GDL: General Data Logger

7 standard channels

1 custom channel

Programmable warm-up time

RS485 Modbus® interface

Sdi-12 output to bridge analog party sensors

One-read modbus to convert analog sensors to digital

Controlled via Aqua4Plus and A4push

Compatible with WaveData® Wireless Systems

Can be networked with other AquiStar® Smart Sensors

Specifications

GDL board

Power

3 or 12 vdc

Communication

Digital board

2 4-20 mA 2 Thermistor

Strain Guage 3 Voltage

GDL and Booster Board

Enabled during readings

Supplies 12 VDCto sensors

T8, T16 & T32 Temperature Data loggers

Thermistor or One-wire Temperature

Data logger

Various thermistors available

Up to 16 thermistors per unit

Up to 32 one-wire temp chips per unit

Weatherproof surface control box

29,000 – 174,000 records, depending on number of active channels

Specifications

Cellular and Radio Frequency Modems

Instrumentation Northwest Presents…

Wavedata Overview

Easy Wellhead installation

Multiple low-power configurations

Cellular, License free, or Both

Watertight Assembly RS485

communication allowing networking of up to 32 devices

Each project specifically designed to lower costs

At Right: Design Set for site specific InstallationCenter: Wavedata site installation with solar power

At Left: Typical installation includes wavedata control boxes mounted at each wellhead.

Well Head

Wave Data Unit

Wavedata Overview

License Free Low Power 900 MHz and 2.4 GHz Multiple Power Levels

.01 watt▪ 1000 feet range

1 watt▪ Five mile range▪ 38,400 baud rate

Variety of antennas available

Above: Buoy based Wavedata installation for Twin Lakes project in Colorado

Wavedata Overview

Power Options: Battery Power

Replaceable alkaline batterys Life expectancy = 5 years

Solar Power Low cost solar panels Maintenance-free site

Hybrid Batteries charge for winter use Batteries used as back-up power source

Available Configurations• Remote radios can be used at ranges up to five miles

• Addition of ip Cell modems allows real-time communication at unlimited distances

• Combination configurations are more economical for applications with multiple points of data

Remote Radio connected to sensors.

• Data availability in several formats through INW’s Aqua4Plus software.• Polling and hosting services offered through INW’s Wavedata system

Software

REMOTE ACCESS MADE EASY.

• Allows easy access to remote data•Mitigates risk of on-the-job injuries•Lowers overall project costs•Improves data quality•Allows access to ecologically sensitive environments•Minimizes environmental impact from access

Unique Features

Capability of working in cross-platform environments: Non-proprietary file types work with most data

management suites and tools, as well as in-house applications.

System design allows for many types of sensor and data inputs, including those not manufactured by INW

Dedicated and knowledgeable support staff throughout your projects duration

“Future ready” design accommodates future changes to project scope and design

Meeting HIF and Mcert Requirments:

INW’s History in Sensor InnovationAdvancements in Sensing: Strain Gauge

ImprovementSmart Sensors: Advances in thermal

compensationSmart Sensors: Advances in linearization and

Long Term drift

INW Patents

-Submersible Sensor – 1991

-Temperature Compensation – 1995

-Cable & Harness – 1999

INW’s Progress & Improvement

Submersible Sensor

Patented water-tight O-ring seal at each end

Installs without rotating or twisting

Multiparameter sensing

Modular construction

Patent # 5,033,297 – July 23, 1991

Temperature Compensation

Better temperature compensation methods

Unique algorithims using sophisticated characterization

Advanced Calibration methodology

Patent # 5,460,049 – October 24, 1995

Temperature Compensation

Compensates for temperature related errors. Calibration of each unit eliminates differences between

individual sensors. No additional temperature sensors needed for temperature

measurements. Uses a relatively inexpensive strain-gauge device for high-

accuracy readings.(.03% FSO for 5 psi device at 0° – 35° C)

Advantages of INW’s Patented Solution

Patent # 5,460,049 – October 24, 1995

Rapid Assembly High pressure rating High pull strength Reduces materials exposed

to water Marked measurement cable Double-redundant sealing

Patent # 5,857,714 – January 12, 1999

Cable/Harness Patent

Measurement Specialties IC86 “Ultra-Stable” Pressure Sensor .02% Repeatibility

.05% Pressure Hysterisis

.05% Temperature Hysterisis

.75% FS Span Thermal error (-20 to 85 C): Challenge to Solve

.5% FS Zero Offset Thermal error (-20 to 85 C): Challenge to Solve

.1% FS non-linearity: Challenge to Solve

Stability

Solving Thermal Error

Elements have thermal Character

Measure Temperature and Pressure over Range to optimize for each sensor

Generate Calibration Coefficients

Apply Cal Values to each measurement

Improves Thermal error to .1% over -20 to 85 C, .05% over 0 to 40

Solving linearization error

Once sensor is thermally compensated to range, you can apply additional linearization math

Currently 3 pt algorithm

Long-Term Drift: Last Challenge

Currently specificed at .1% FS Span/yr Typical

Depends on many factors

Current recommendation: Service every 6 months, by doing this you eliminate installation variables as well

Results: Less than .01 Feet error over 3 years with our 30 psi units!!!

Questions?Suggestions for improvement?

Current needs?Please visit us at

http://www.inwusa.com

Thank You!

Instrumentation Northwest8901 122nd Ave NE, Kirkland WA, USA 98033

www.inwusa.com