ultrasonic level sensor

8/12/2019 Ultrasonic Level Sensor

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March 2000

Instruction Manual

MDT Document Number 20-24

Level Monitor

Part Number:

222573-001

Ultrasonic Level

Monitor

Intrinsically Safeand

Non-Intrinsically Safe


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Page 2 Ultrasonic Level Monitor MDT 20-24

Introduction

Note:The Ultrasonic Level Monitor is to be used only in the manner

outlined in this instruction manual.

The ultrasonic level monitor combines sensor and electronics in asingle package. It is designed to measure liquid levels in open orclosed vessels. The process part (sensor) is Tefzel, allowing theUltrasonic Level Monitor to be used in a wide variety of industries,especially food and chemical.

The sensor houses the ultrasonic transducer and temperaturesensing element. The unit emits a series of ultrasonic pulses from thetransducer. Each pulse is reflected as an echo from the material andsensed by the transducer and is processed using Milltronics provenSonic Intelligence techniques. Filtering is applied to helpdiscriminate between the true echo from the material, and falseechoes from acoustical and electrical noises and agitator blades in

motion. The time for the pulse to travel to the material and back istemperature compensated and then converted into distance fordisplay, mA output.

Installation

EnvironmentalThe monitor should be mounted in an area that is within thetemperature range specified and that is suitable to the housingrating and materials of construction. The front lid should beaccessible to allow programming, wiring and display viewing.

It is advisable to install the unit away from high voltage or currentruns, contactors and SCR control drives.

Location

Locate the unit so that it will have aclear sound path perpendicular to

the liquid surface

The units sound path should notintersect the fill path rough walls,

seams, rungs, etc

sanitary

ferrule

pipe

rungs

seams

fill


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MDT 20-24 Ultrasonic Level Monitor Page 3

Mounting

Note:Mount the monitor so that the face of the sensor is at least 25 cmabove the highest anticipated level.

Threaded

The unit is available in three thread types: 2" NPT, 2" BSP or PF2.

Note:Before inserting the unit into its mounting hole, insure that thethreads are of the same type to avoid damage.

Flange Adapter (optional)

The monitor can be fitted with the optional 75 mm (3") flangeadapter for mating to 3" ANSI, DIN 65PN10 and JIS 10K3B flanges.

hinged lid

thread typeidentification

cable entryknock out

electronics286mm(11.3)

74mm(2.9)

mountingthread

sensor

ultrasonic level

monitoroptional

flangeadapter


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Interconnection

Cable Entry

A. with lid closed, remove cable

entry `knock out' on either sideas required

B. open lid by loosening the lidscrew

C. run cable to the unit

D. connect loop wiring

E. close lid. Tighten screw to 1.1 to1.7 N-m ( 10 to 15 in-lb ) of torque

System Diagram

Ultrasonic LevelMonitor

loopinstrumentation

Connection to DAQ


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Intrinsically Safe Model

FM / SAA(reference drawing 1-8600016Z-DX-A)

Under the entity evaluation concept, the Ultrasonic Level Monitorhas the following characteristics :

Vmax = 30 V dc Imax = 200 mA dc

Ci = 0 Li = 0

Definition :

The Entity Concept allows interconnection of intrinsically safe apparatusto associated apparatus not specifically examined in such combination.The criteria for interconnection is that the voltage and current whichintrinsically safe apparatus can receive and remain intrinsically safe,considering faults, must be equal or greater than the voltage (Voc or Vt)

and current (Isc or It) levels which can be delivered by the associatedapparatus, considering faults and applicable factors. In addition, themaximum unprotected capacitance (Ci) and Inductance (Li) of theintrinsically safe apparatus, including interconnecting wiring, must beequal to or less than the capacitance and inductance which can besafely connected to associated apparatus.

FM / SAA / CSA(reference drawing 1-8600016Z-DX-A)

Approved dust tight and water tight conduit seals are required forClass II, Div. 1, Gr. E, F, G, and outdoor NEMA 4X/ type 4 locations.

The maximum voltage of the non-intrinsically safe apparatus must

not exceed 250 V rms.

Use only intrinsically safe barriers as listed.

Terminal ConnectionMake Part no.

Barrier The monitor

3 1MTL 787s+

4 24 1

MTL 706+3 2

3 1STAHL

9002 / 13-

280-110-00 4 2

3 1STAHL

9001 / 51-

280-110-14 4 2

24 V dc

supply

load4 20

mA

4 20 mA

see terminalconnection

table

barrier


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DC Repeater

Safe Area Hazardous Area

AC Repeater

Safe Area Hazardous Area

Note:Power supply input is reverse polarity protected.

20 35 V

dc supply

load

4 20 mA


table

MTL 3041 / 20 35 V dc

4 20 mA

N / L2

load

4 20 mA


table

MTL 2441 / 120V & 240 V

4 20 mA

L1


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Baseefa / Cenelec

System Approval 95C2033 (reference drawing 1-8600018Z-DX-A)

Approval compliance requires the use of one of the followingbarriers or equivalent (see EU Equivalency).

Terminal ConnectionMake Part No.

(certification) Barrier The monitor

3 1MTL

787s+(EX832452) 4 2

4 1MTL

706+(EX87B2428) 3 2

3 1

STAHL

9002 / 13-

280-110-00(EX-91.C.2045X) 4 2

3 1STAHL

9001 / 51-280-110-14

(EX-91.C.2046X) 4 2

DC Repeater

AC Repeater

* EExia IIC, Tamb = 60 C, Ex 95C2032

24 V dc

supply

load

4 20mA

4 20 mA

Ultrasonic levelmonitor*barrier

20 35 V

dc supply

load

4 20 mA


table

MTL 3041 / 20 35 V dc

4 20 mA

N / L2

load

4 20 mA


table

MTL 2441 / 120V & 240 V

4 20 mA

L1


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Operation

Start Up

With the unit correctly installed (or aimed at a wall 0.25 to 5 m

away), apply power.

The Ultrasonic Level Monitor starts up displaying the following:

It then defaults to the Run mode, which is the measurement readingof the distance from the transducer face to the material level in theunits indicated:

If the default display differs form that shown, refer to OperationStatus on page 10.

CalibrationThe calibration of the mA output may be done such that its span willbe either proportional or inversely proportional to the material level.

proportional span inversely proportional span

high level = 20mA high level = 4 mA

low level = 4 mA low level = 20mA

Note:The 4 and 20 mA levels may be calibrated in any order.

Calibration: Reference Method

With the vessel (or a target) at a distance corresponding to the

desired calibration value, press the respective "4" or "20" key. Aviewing sequence of the stored value is automatically initiated.During this time a calibration can be done by pressing the key asecond time. After viewing or calibrating, operation automaticallyreverts to the Run mode (6 sec).

The calibration value is referenced from the face of the monitors

sensor, in the units displayed.

program mode

alphanumeric

units

LOE / fault

operation status

4key

20key


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4 mA calibration

4 mAcalibration

new 4mAcalibration

calibration invalid

if

retry

20 mA calibration

20 mAcalibration

new 20 mAcalibration

calibration invalid

if

retry

Note:

Calibration bypasses the measurement response rate.

Operation Status

The graphic portion of the display gives the user a visual indicationof the monitors operating status. Viewing the graphic can assist theuser in properly locating and installing the unit to achieve optimum

performance.

GOOD WAITING LOE / FAULT

The logo will change from full to partial to indicate operation status.

After the `Waiting' period, the `?' icon will appear for an `LOE /FAULT' indication. When a valid echo is again received, a `Good'indication will resume. Refer to Troubleshooting on page 17.


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Adjustments

There are several operating adjustments that can be made to theUltrasonic Level Monitor.

To access the operating adjustments, simultaneously press the "4"and "20" keys until the desired adjustment is obtained. A viewingsequence of the stored value is automatically initiated. During thistime the value can be changed by pressing either the "4" or "20"key. After viewing or changing, operation automatically reverts to theRun mode (6 sec).

4 mA calibration,scrolling

20 mA calibration,scrolling

blanking

speed of response

alarm

fail-safe

units


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Calibration, Scrolling Method

The 4 and 20 mA calibration values can be selected wherereference levels, either from the material in the vessel or from atarget, cannot be provided. This method can also be used to trim theoutput levels obtained by the Reference Method (see page 9).

To change the stored calibration value, obtain the `c 4' or `c 20'display. The calibration value may be increased by pressing the "20"key or decreased by pressing the "4" key. When the display hasscrolled to the desired value, stop pressing the key. The displayautomatically reverts to the Run mode (6 sec).

4 mA calibration

4 mA calibrationinitiated

view stored 4 mAcalibration value i.e.

4.50 m

press to increase tonew calibration value

i.e. 4.60 m

new calibration value

20 mA calibration

20 mA calibrationinitiated

view stored 20 mAcalibration value i.e.

0.50 m

press to decrease tonew calibration value

i.e. 0.45 m

new calibration value

Note:For faster scrolling, hold the key depressed during the calibrationadjustment and release when desired value is obtained.


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Blanking

Blanking is used to ignore the zone in front of the transducer wherefalse echoes are at a level that interfere with the processing of thetrue echo. It is measured outward from the sensor face. Theminimum recommended blanking value is 0.25 m (0.82 ft) but can

be increased in order to extend the blanking.

To change the stored blanking value, obtain the `bL' display. Theblanking value may be increased by pressing the "20" key or

subsequently decreased by pressing the "4" key. When the displayhas scrolled to the desired value, stop pressing the key. The displayautomatically returns to the Run mode (6 sec).

3 sec

blanking

stored blanking valuei.e. 0.25 m

increase blanking i.e.0.36 m

oops - too far!

decrease to desiredblanking value i.e.

0.35 m

6 sec

new blanking value

Note:For faster scrolling, hold the key depressed during the blankingadjustment and release when desired value is obtained.

UltrasonicLevel

Monitorblanking


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Speed of Response

The speed of response adjustment allows the user to collectively seta number of operating parameters.

measurementresponse: is the limit to which the monitor will be able tokeep up with rates of change.

If measurement cannot keep up with the rate oflevel change, set the adjustment from `1' to `2'.If the monitor still cannot keep up with the rateof level change, set the adjustment option to `3'.Avoid choosing an option that is too fast foryour application.

agitatordiscrimination:

discriminates between agitator blades inmotion, and the material (target) surface.

filter: discriminates between false echoes fromacoustical and electrical noise and the material(target) surface.

fail-safe timer: establishes the `Waiting' period from the time aloss of echo or operating fault condition startsuntil the fail-safe default is effected.

SPmeasurement

responseagitator

discriminationfilter

fail-safetimer

1*1 m/min

(3.3 ft/min) on on 10 min

25 m/min

(16.4 ft/min)on on 3 min

3 immediate off off 3 min

40.03 m/min(0.1 ft/min)

on on 10 min

*= factory setting.

To change the speed of response, obtain the `SP' display. Scrollforward through the options (1-2-3) by pressing the "20" key. Scrollbackward through the options (3-2-1) by pressing the "4" key. Whenthe desired option is displayed, stop pressing the key. The displaywill automatically return to the Run mode (6 sec).

3 sec

speed of response

current optioni.e. 1 m/min

option 2i.e. 5 m/min

6 sec

option 2selected


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Fail-Safe

In the event a loss of echo or fault condition exceeds the `Waiting'period (see Speed of Response on page 14), the ` ? ' icon appearsand one of the following fail-safe defaults is immediately effected.

FLS default mAp mAi reading

1* full 22 4 hold

2 empty 4 22 hold

3 hold hold hold hold

p = proportional span

i = inversely proportional span*= factory default

To change the fail-safe default obtain the `FLS' display. Scrollforward through the options (1-2-3) by pressing the "20" key. Scrollbackward through the options (3-2-1) by pressing the "4" key. Whenthe desired option is displayed, stop pressing the key. The display

will automatically return to the Run mode (6 sec).

3 sec

fail-safe

current optioni.e. full

option 2i.e. empty

6 sec

option 2selected


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Units

The units of the measurement reading can be selected as follows:

1 = metres, m (factory setting)2 = feet, ft

The selected units are also applicable to the `Blanking' and `Alarm'adjustments.

To change the units obtain the `Un' display. Scroll forward throughthe options ( 1 - 2 ) by pressing the "20" key. Scroll backwardthrough the options ( 2 - 1 ) by pressing the "4" key. When thedesired option is displayed, stop pressing the key. The display will

automatically return to the Run mode (6 sec).

3 sec

units

current optioni.e. m

option 2

i.e. ft

6 sec

option 2selected


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Supplement

Measurement Interval

Troubleshooting

The echo is not reliable and the monitor iswaiting for a valid echo before updating the

measurement.Waiting Probable causes are:

material or object in contact with sensorface

The unit is too close to the fill point

The unit is not perpendicular to the liquidsurface

change in level too fast

measurement out of range

foam on liquid surface

high level of vibration in the mountingstructure

level inside the blanking zone

The `Waiting' period has expired.Investigate the probable causes listedabove.

LOE/Fault Refer to Speed of Response on page 14 forduration of `Waiting' periods.

mA

loop current

interval

seconds


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Specifications

Power:12 to 28 V dc,(at monitor), 0.1 A surge loop current 4 to 20 mA max

Environmental: location: indoor / outdooraltitude: 2000 m max.ambient continuous: -40 to 60C (-40* to 140F)

temperature -20C (-5F) if metal mounting relative humidity: suitable for outdoor (Type 4X / NEMA 4X / IP65

enclosure)

installation category:

IIpollution degree: 4

Range:0.25 to 5 m ( 0.8 to 16.4 ft ) (liquids only)

Beam Angle:10at -3 dB boundary

Memory:non-volatile EEPROM, no battery required

Programming:2 tactile keys

Temperature Compensation:built-in to compensate over the operating range.

Display: liquid crystal three 9 mm (0.35") digits for reading of distance between sensor face and

materialmultisegment graphic for operation status

mA Output range: 4 20 mAspan: proportional or inversely proportional

accuracy:

0.25% of full scale resolution: 3 mm (0.125") loading: 600 ohms max loop load at 24 V dc supply

Construction:combined sensor and electronics packagesensor housing: material: Tefzel

mounting: threaded: 2" NPT, 2" BSP PF2

optional: flange adapterelectronics material: PVC

housing: access: hinged lid22 mm (0.87") dia. `knock out' for

conduit entrance, 2 places2 screw terminal block for 2.5 mm

2

(14 ga) solid wire / 1.5 mm2(16 ga)

stranded wire max

Enclosure Rating:Type 4X/ NEMA 4X / IP65

Weight:1.5 Kg (3.3 lb)

Approvals:CE, EMC performance available on request. intrinsically safe CSA, FM, intrinsically safe for Class I & II, Div. 1, GR.

A, B, C, D, E, F, G hazardous locationSAA, Exia IIC T6 IP65, Class I Zone 0BASEEFA / CENELEC, EExia IIC T4, Tamb = 60C Ex

95C2032


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Important Safety NoticeProper service and repair is important to the safe, reliable operation of all M/D Totcoequipment. The service procedures recommended by M/D Totcoand described in thetechnical manuals are recommended methods of performing service operations.When these service operations require the use of tools specially designed for thepurpose, those special tools should be used as recommended. Warnings against the

use of specific service methods that can damage equipment or render it unsafe arestated in the manuals. These warnings are not exclusive, asM/D Totco could notpossibly know, evaluate and advise service people of all conceivable ways in whichservice might be done or of all possible associated hazardous consequences.Accordingly, anyone who uses service procedures or tools which are notrecommended by M/D Totcomust first satisfy themselves thoroughly that neitherpersonnel safety nor equipment safety will be jeopardized by the method selected.

Limited Product WarrantyTHE FOLLOWING WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHERWARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING,BUT NOT BY WAY OF LIMITATION, ANY WARRANTY OF MERCHANTABILITY ORFITNESS FOR ANY PARTICULAR PURPOSE.

Martin-Decker TOTCO (Company) warrants to Buyer (Purchaser) of new productsmanufactured or supplied by the Company that such products are, at the time ofdelivery to the Purchaser, free of material and workmanship defects, subject to the

following exceptions:

A. Any product which has been repaired or altered in such a way, in the Company'sjudgement, as to affect the product adversely, including any repairs, rebuilding,welding or heat treating outside of Company authorized facility.

B. Any product which has, in the Company's judgement, been subject to negligence,accident, or improper storage.

C. Any product which has not been installed, operated and maintained in accordance

with normal practice and within the recommendations of the Company.

D. For all items of special order by Buyer which are not manufactured by Company,Buyer should submit warranty claims directly to the manufacturer thereof.

The Company's obligation under this warranty is limited to repairing, or at its option,replacing any products which in its judgement proved not to be as warranted within theapplicable warranty period. All costs of transportation of products claimed not to be aswarranted to authorized Company service facility shall be borne by Buyer. Costs ofreturn transportation to Buyer of products accepted for repair or replacement byCompany under the warranty provisions of the Sales Agreement shall be borne by theCompany. Company may, at its sole option elect to refund the purchase price of theproducts, and Company shall have no further obligation under the Sales Agreement.

The cost of labor for installing a repaired or replacement part shall be borne by Buyer.Replacement parts provided under the terms of this warranty are warranted for theremainder of the warranty period of the product upon which installed to the sameextent as if such parts were original components thereof.

The warranty periods for various products are:

A. Hydraulic, Mechanical, Electronic Equipment: one (1) year from date of installationor fifteen (15) months from date of shipment from Company, whichever occurs first.

B. All Elastomer Diaphragms: six (6) months from date of shipment from Company.

No deviations from the Company's standard warranty terms or period as stated hereinwill be honored unless agreed to in writing by an authorized Company representativeprior to acceptance of the order.

EXCLUSIVITY OF REMEDY AND LIMITATION OF LIABILITY. THE REMEDIESPROVIDED FOR IN THIS WARRANTY SHALL CONSTITUTE THE SOLERECOURSE OF BUYER AGAINST COMPANY FOR BREACH OF ANY OFCOMPANY'S OBLIGATIONS UNDER THE SALES AGREEMENT WITH BUYER,WHETHER THE CLAIM IS MADE IN TORT OR IN CONTRACT, INCLUDING CLAIMSBASED ON WARRANTY, NEGLIGENCE, OR OTHERWISE.

IN NO EVENT SHALL COMPANY BE LIABLE FOR DIRECT, INDIRECT,

INCIDENTAL OR CONSEQUENTIAL DAMAGES, REGARDLESS OF THE FORM OFACTION, WHETHER IN CONTRACT, STRICT LIABILITY OR IN TORT (INCLUDINGNEGLIGENCE), NOR FOR LOST PROFITS.

iii April 1981M/D Totco

iv April 1981M/D Totco

ultrasonic level sensor

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