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51-638 Echotel Model 338 Two-Wire Ultrasonic Transmitter

2.6.2 Transmitter

Supply voltage

12 to 36 VDC

Power consumption

48 to 720 mW

Output signal

4-20 mA isolated,
600 ohm load

Diagnostic alarm

3.6, 22 mA, or Hold

User Interface:

Keypad

4-button menu-driven data
entry

Display

Removable 6 digit custom
LCD module with dual
function bar graph

LED status indication

Echo strength and power

Ambient temperature

-22° to +140° F
(-30° to +60° C)

LCD module temperature

-13° to +140° F
(-25° to +60° C)

Enclosure

Plastic (PBT)
NEMA 6 (IP 67)

Cable entry

Two –

⁄

" NPT and

Two – PG16

2.6.3 Transducer

Maximum range

20 feet (6 meters)

Dead zone

10 inches (250 mm)

Frequency

80 kHz

Process connection

2 inch NPT
(flanges optionally available)

Process temperature

-22° to +195° F
(-30° to +90° C)

Process pressure

Atmospheric to 44 psi (3 bar)

Ultrasonic beam angle

5° conical

Temperature compensation

Automatic over the operating
temperature range of the
transducer

Transducer

Polypropylene NEMA 6P
(IP 68)

These units have been tested to EN 50081-2
and EN 50082-2 and are in compliance with
the EMC Directive 89/336/EEC.

Содержание STI Echotel 338

Страница 1: ...Installation and Operating Manual Two Wire Non Contact Ultrasonic Transmitter For Level Volume and Open Channel Flow Measurement Echotel Model 338...

Страница 2: ...unless power has been switched off or the area is known to be non hazardous Low Voltage Directive For use in Installation Category II Pollution Degree 2 If equipment is used in a manner not specified...

Страница 3: ...arameters 26 1 6 8 Open Channel Flow Head and Totalizers 28 1 6 9 Output Test Parameters 28 1 6 10 Simulation Mode 29 1 6 11 Additional Software Parameters 30 1 7 Configuration without LCD Module 31 1...

Страница 4: ...iderations that should be evaluated prior to installing a non contact ultrasonic trans mitter The next few pages should be read thoroughly to ensure that the Model 338 will perform as expected in the...

Страница 5: ...m Another alternative is to install the transducer in a stilling well that extends below the lowest level to be measured in the tank 1 2 7 Vapors Closed tanks that contain chemicals or other liquids t...

Страница 6: ...ve the LCD module to access the 4 position terminal block 2 The two wires are connected to the 4 position removable terminal block with negative at position 2 and positive at position 3 Caution Termin...

Страница 7: ...g or replacing the LCD module The 338 is fully functional without the plug in LCD module The LCD module consists of a bar graph that indicates echo strength or level as a percentage of span and a cus...

Страница 8: ...normal operating mode as shown below Push button While Configuring Unit In Normal Mode ENTER QuickSet Configuration saves the displayed data Not used and proceeds to the next parameter register Comple...

Страница 9: ...ete Configuration 2 Range maximum measuring distance 3 4 mA setpoint 4 20 mA setpoint 5 Fail safe indication of 3 6 mA 22 mA or Hold 6 Damping time of up to 60 seconds The Model 338 is shipped with Le...

Страница 10: ...existing parameter value will keep blinking This is due to 1 The value is out of range example would be trying to enter a range value larger than 20 00 feet 2 The parameter value is not valid for this...

Страница 11: ...d save it with the ENTER key Automatic Entry Use the Get Level function UP DOWN to display the actual measured value with level in the tank or to a fixed target Push ENTER to save value and proceed to...

Страница 12: ...Register must be blinking press for 3 seconds to enter or exit the Complete Configuration menu UP DOWN Scroll up or down Parameter Registers Increase or decrease Parameter Value ENTER Switches blinki...

Страница 13: ...ch register is d c b a P00 cba Application and Engineering Units Factory default value for P00 is 000 c Measuring System 0 Metric 1 US b Engineering Units see c English Metric 0 feet meter 1 inch cm P...

Страница 14: ...Factory default value for P02 is 000 Engineering units for volume are selected in b and units for open channel flow are selected using b and c Metric or US for b is selected by the value of c in P00 T...

Страница 15: ...ues 2 5 10 20 50 represent the numeric steps the calculat ed value will change in the last one or two digit s Examples P03 1 steps by 2 1 000 1 002 1 004 1 006 P03 5 steps by 50 1 000 1 050 1 100 1 15...

Страница 16: ...level mark While in P04 press the ENTER key so that the four digit parameter is blinking Press the UP DOWN keys simultaneously for 3 seconds and the unit will display the measured distance between th...

Страница 17: ...im of a standpipe or from any object protruding into the ultrasonic beam close to the transducer Since the 338 will not measure any value inside the dead zone the full tank usually 20 mA value will ne...

Страница 18: ...ettings P10 4 mA current output value P11 20 mA current output value The mA current output values are calculated according to the Measurement Mode that was selected in P01 For measurements LEV or VOL...

Страница 19: ...e two or more echoes when the transducer is mount ed in the center of a domed top tank If the transducer can not be positioned away from the center of the domed top the 338 provides compensation to re...

Страница 20: ...ise within the vessel Register P25 provides two different echo selection modes for the 338 to use in forming the measurement window around the prop er signal Received signal amplitude Echo 1 Echo 2 t...

Страница 21: ...isplay and 4 20 mA output at their last value during an echo loss If the echo loss continues for a period of time 10 seconds longer than twice the damping set in P20 then the dis play will change to n...

Страница 22: ...an adjust ment to be made for this difference This parameter should only be used if the gas is homogenous throughout the tank It should not be used if there are stratified layers of a gas in the tank...

Страница 23: ...from the shapes shown below P41 45 Tank dimensions Factory default values for P41 45 are 0 00 Enter appropriate dimension as shown below for the tank P40 Tank Shape Also to be set b0 Vertical cylindri...

Страница 24: ...the appropriate dimensions into P41 through P45 depending on which type of primary flow element is being used P40 Primary element Flume Weir Also set 09 Parshall flume for any size Parshall flume P46...

Страница 25: ...6 The sensor is mounted over the flume at a distance of 2 3 A behind the throat The head h is also shown at left When configuration is completed the head value can be viewed in P76 P40 10 Palmer Bowlu...

Страница 26: ...wing equation Q m3 s P42 1 744 h1 5 0 091 h2 5 Enter the values for P42 and P46 as shown at left P40 14 Bottom step weir The flow through a bottom step weir is derived from the following equation Q m3...

Страница 27: ...ues for P40 P42 and P46 P40 18 V notch weir 0 0002 Q m3 s 1 20 P42 100 0 05 h m 1 Q m3 s 1 320 tg P42 2 h2 47 The range P04 value is larger than the reference distance P46 as shown at left Enter value...

Страница 28: ...The left column indicated as L in the display contains the level values measured by the Model 338 unit The right column indicated as r in the display contains the volume open channel flow or level va...

Страница 29: ...linearization table after rec ognizing an L level value of 000 0 An error code will be displayed if the above format is not followed when enter ing values into the linearization table 1 6 7 Informatio...

Страница 30: ...the selected echo into the 338 transmitter Parameters P71 through P73 display data concerning the Measuring Window These are readout only parameters P74 Signal to Noise Ratio P74 gives an indication...

Страница 31: ...up for open channel flow P76 can not be viewed P77 Resettable totalizer T1 P77 displays the value of the resettable totalizer used for open channel flow To reset T1 1 While in P77 press NEXT DOWN simu...

Страница 32: ...the simulation mode configuration Note that the simula tion levels must be within the programmed values for measuring range P04 and deadzone P05 To start the simulation mode return to the measurement...

Страница 33: ...password the password protection will automatically be activated when the unit is returned to the Measurement Mode If password protection is activat ed the software parameters can only be viewed this...

Страница 34: ...mA current output can also be assigned in inverted mode with 4 mA 100 full tank and 20 mA 0 empty tank NOTE Programming without the LCD module is only possible if the unit is receiving a valid echo th...

Страница 35: ...nimum distance in the tank Action LED indication Check for a valid echo Valid echo received transmitter is to be programmed Press NEXT steadily Transmitter is in programming mode While continuing to p...

Страница 36: ...ir original settings Action LED indication Press NEXT steadily Transmitter is in programming mode While continuing to press Reset in progress NEXT press the ENTER steadily Release both buttons Factory...

Страница 37: ...ion Causes and actions to be done Memory error Contact local representative or the factory Echo loss No echo received no reflection reposition the unit Hardware error Contact local representative or t...

Страница 38: ...transducer also meas ures the temperature in the vessel to provide compensation for changing temperature By inputting the type and geometry of the vessel the intel ligent electronics can calculate the...

Страница 39: ...EAM Vapors can cause problems when the liquid No condensation 1 0 process temperature is well above the temperature of the airspace The Little condensation 0 9 greater the difference the more expected...

Страница 40: ...6 5 feet 2 m 2 mm for 6 5 to 16 4 feet 5 m 5 mm for 16 4 to 20 feet 6 m Velocity Velocity Gases Chemical Formula ft sec m s Acetaldehyde C2H4O 829 4 252 8 Acetylene C2H2 1118 2 340 8 Ammonia NH3 1410...

Страница 41: ...LCD module temperature 13 to 140 F 25 to 60 C Enclosure Plastic PBT NEMA 6 IP 67 Cable entry Two 1 2 NPT and Two PG16 2 6 3 Transducer Maximum range 20 feet 6 meters Dead zone 10 inches 250 mm Frequen...

Страница 42: ...module 5 12 to 36 VDC P Plastic PBT NEMA 6 338 Integrally mounted transmitter with 80 kHz transducer plastic housing polypropylene transducer 2 6 4 Physical 2 NPT PG16 2 1 2 NPT 2 2 4 60 2 1 54 4 7 12...

Страница 43: ...ed P96 not used P97 30 Software Code P98 not used P99 30 Password Protection Par Page Description Value P00 10 Application and Engineering Units P01 10 Bar Graph and Measurement Mode P02 11 Calculatio...

Страница 44: ...arranty period and 2 The factory inspection finds the cause of the claim to be covered under the warranty If the trouble is the result of conditions beyond our con trol or is NOT covered by the warran...

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