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JF-1A Conductivity Sensor

A440-009

Page 12 of 56

FEBRUARY 2009

7.2 4 – 20 mA CONDUCTIVITY READINGS

The following table details current output readings for the JF-1A sensor with a
nominal 0-500 pS/M range representing 4 – 20 mA. (Please consult the factory
for alternate range settings of the current output):

CONDUCTIVITY (Ps/M)

Current (mA)

Voltage * (Volts)

0.0

4.0

1.00

62.5

6.0

1.50

125.0

8.0

2.00

187.5

10.0

2.50

250.0

12.0

3.00

312.5

14.0

3.50

375.0

16.0

4.00

437.5

18.0

4.50

500.0

20.0

5.00

•

250 Ohm Voltage Sensing Resistor Used

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Содержание JF-1A

Страница 1: ...this manual to answer your questions regarding our product If you have any suggestions or comments please contact us at Mail D 2inc com This document is provided with the understanding that future ve...

Страница 2: ...ION 5 4 0 THEORY OF OPERATION 6 5 0 D 2 JF 1A SENSOR 7 6 0 MECHANICAL INSTALLATION 8 7 0 ELECTRICAL INSTALLATION 9 8 0 TEST PROCEDURE 15 9 0 SENSOR REMOVAL 17 10 0 SPECIFICATIONS 17 11 0 SERIAL DATA I...

Страница 3: ...JF 1A CONDUCTIVITY SENSOR A440 009 Page 3 of 56 FEBRUARY 2009 Appendix A Service Warranty Policy 30...

Страница 4: ...ed range of conductivity User configurations and instrument calibration terms are stored in internal non volatile memory The D 2 sensor is continuously internally electronically calibrated Absolute ca...

Страница 5: ...ows for its use with industry standard PID Controller Display units combined with additive injector pumps to provide real time control over addition of conductivity enhancing additives during the tran...

Страница 6: ...to the electrodes Conduction through the fuel results in an AC electrical current that is amplified detected and output as either direct serial ASCII data or as a standard 4 20 mA industrial current l...

Страница 7: ...ined in a sealed approved housing The sensor is designed to be fully intrinsically safe for operation in fuel facilities The back cover allows for direct conduit connection to the meter and offers bot...

Страница 8: ...e mounted well away from possible sources of electromagnetic noise such as large pump motors AC power Lines or electrical circuits containing large transient switching currents Note Prior to arc weldi...

Страница 9: ...r may be activated The 4 20 mA Loop supply open circuit voltage must be consistent with the Open Circuit Supply needs of the JF 1A at both its minimum and maximum indicating currents The JF 1A has bot...

Страница 10: ...he loop and should comply with the requirements of the local electric code R Loop By Pass OHMS uF 250 1 350 2 2 500 3 3 In the figure below a typical loop wiring with by pass capacitors is shown for t...

Страница 11: ...F 1 SENSOR 4 20 mA DC POWER SUPPLY R1 SENSE R2 SENSE C1 BY PASS C2 BY PASS C3 GROUND SHUNT PROPERLY BY PASSED 4 20 mA INSTRUMENTATION LOOP EARTH GROUND NOTE Sensor wiring should be performed as define...

Страница 12: ...1A sensor with a nominal 0 500 pS M range representing 4 20 mA Please consult the factory for alternate range settings of the current output CONDUCTIVITY Ps M Current mA Voltage Volts 0 0 4 0 1 00 62...

Страница 13: ...ure 8A 4 WIRE ELECTRICAL CONNECTION DETAIL 1 2 4 3 3 2 1 3 2 1 The 4 Terminal Screw Connector has both Power Input and RS 232 RS 485 Connections as listed in Table 1 below TABLE 1 SCREW TERMINAL CONNE...

Страница 14: ...power supply See Section 7 0 for detailed electrical connections Attach D 2 Test Cable P N B440 079 to the 4 Wire connector located on the user connection interface See Figure 7 8 2 TERMINAL SOFTWARE...

Страница 15: ...ble Data is displayed as Conductivity Temperature Compensated Conductivity CR LF Note The sensor is factory calibrated in certified zero conductance fluid The serial port may read a slightly negative...

Страница 16: ...of reading However due to fuel measurement characteristics the repeatability and reproducibility limits are as follows Table 2 SENSOR SPECIFICATIONS SENSORS Parameter Conductivity Temperature Range 0...

Страница 17: ...lectrical adjustments All instrument calibration constants and configurations are stored in internal non volatile memory The unit also has programmable output span range for the 4 20 mA output allowin...

Страница 18: ...15 4 Temperature of Fuel in Celsius 23 8 Compensated Conductivity 11 2 CONTINUOUS DATA To have the unit send data continuously without polling the user can send the SC Set Continuous Command The unit...

Страница 19: ...67 759354 MT 9 510620E 05 TREF 20 100000 MC 1 280000E 02 N 1 000000 W 30 NREF 1 000000 DAO 375 DAF 500 000000 In the Table Below the definition of each of these constants is given Table 4 OPERATIONAL...

Страница 20: ...volatile memory using the E command Note cycling power after changing constants and before storing them in non volatile memory using the E command will result in the unit reverting to the original val...

Страница 21: ...l constants To enter the CALIBRATION MODE the C command sent from the OPEN MODE See Open Mode Above After entering CALIBRATION MODE the unit will send the following frame of data when polled using a c...

Страница 22: ...electric constant from air to fuel 12 1 SENSOR REMOVAL To remove the probe from the fuel load line please refer to section 9 0 12 2 POWER SENSOR Using D 2 Test Cable P N A440 043 Connect the sensor to...

Страница 23: ...held meter or other suitable and industry accepted standardization device Verify reported conductivity from JF 1A and hand held are within acceptable limits 13 0 COMPENSATED OUTPUT The D 2 JF 1A Cond...

Страница 24: ...394 506 30 63 190 316 443 570 34 71 214 356 499 641 38 80 240 401 561 721 42 90 270 451 631 811 46 101 304 507 710 913 50 114 342 571 799 1027 The D 2 JF 1A Current Output is base on Compensated Cond...

Страница 25: ...F 1A Conductivity Sensor A440 009 Page 25 of 56 FEBRUARY 2009 In the table below 63 and 90 response times are given for each box card setting See Section 10 0 for setting the box car number constant n...

Страница 26: ...e JF 1A sensor output can change from scan to scan W has units pS cm scan and can be set from 0 999 W is an effective tool to reduce data output spikes in installations where sudden physical changes o...

Страница 27: ...15 2 Cleaning The JF 1A Conductivity Sensor should be cleaned every 6 months of use Fuel additives or particulate may build up on the sensor degrading its performance The sensor can be cleaned using t...

Страница 28: ...is connected to JP2 Terminals These are snap out Molex screw terminals which can be removed to assist in wiring Cabling used should be in compliance with the JF 1A Ex examination certificate The 2 wi...

Страница 29: ...The supply should have high isolation 500 Mohm and be single point grounded The current loop should be wired using shielded twisted pair wire The shield should also be single point grounded to a solid...

Страница 30: ...us freight costs will be borne by the customer All equipment supplied by D 2 that is designed for use under hydrostatic loading has been certified by actual pressure testing prior to shipment The cust...

Страница 31: ...e covered If repair is necessary the customer will be contacted and apprised of the additional cost The customer will be charged the standard repair cost which includes repair and calibration In the e...

Страница 32: ...o meet the full expectations of our customers and we welcome comments on the structure content and the ability of this manual to answer your questions regarding our product If you have any suggestions...

Страница 33: ...e calibration relies only on the sensor cell constant that is very stable by design The conductivity sensor has a built in temperature sensor Output from the temperature sensor is used to fully compen...

Страница 34: ...trument power and validate that power up banner is received from the unit Request data from the unit after 10 seconds and confirm data responses are received to validate serial data out connection to...

Страница 35: ...ibration value using command ZERO ZERONEW g Check by returning to run mode using the R command h Iterate steps a g as is needed to gain a reading less than 2 pS M i Save constant by returning to Open...

Страница 36: ...nd k Repeat the Zero Adjustment in 2 4 Above 2 5 4 20 mA OUTPUT CALIBRATION General The JF 1 Sensor can be used with fuel conductivities from 0 2000 pS M Normally the sensor has the 4 20 mA output sca...

Страница 37: ...Non Standard Range c Connect the serial cable to the test jack on the JF 1 Sensor On the PC press enter and confirm connection is made by the receipt of a single line of data from the JF 1 Sensor d P...

Страница 38: ...of the low end j To test this value we need only to set conductivity to our desired full scale value by sending Cond 0 to the JF 1 unit Then temporarily disconnect the serial port from the computer a...

Страница 39: ...ct Outputs Conductivity is output as a 4 20 mA signal This 2 Wire port is also used to supply power to the instrument when used alone The current that flows in the loop is proportional to the conducti...

Страница 40: ...ces I E if two isolated power supplies are in use you cannot measure the voltage of one with the return lead of the voltage measuring device attached to the other All power sources used with the JF 1A...

Страница 41: ...JF 1A Conductivity Sensor A440 009 Page 41 of 56 FEBRUARY 2009 3 2 1 3 2 1 24 VDC ISOLATED POWER SUPPLY GND GND PLC CURRENT DETECTOR 1 2 4 3...

Страница 42: ...p current detector are normally isolated from ground A second fully isolated 24 VDC supply is needed for the temperature current loop This is required as the conductivity loop which powers the JF 1A h...

Страница 43: ...power supply supplies loop power and a 250 ohm sense resistor is used to sense the current in the conductivity loop convert the current to a voltage in the PLC As in example 1 the JF 1A derives its p...

Страница 44: ...nection to the RS 232 data port The isolator again prevents the data ground from interfering with the virtual ground needed by the two current loops operating at the same time Note the power is not ne...

Страница 45: ...Warning Prior to connecting serial ports or other equipment to the JF 1A sensor carefully follow the instructions in Application Note 10 006 Power Ground Requirements for JF 1A when 4 20 mA and Serial...

Страница 46: ...errors of reference resistor A D s etc are completely incorporated If you are calibration the current loop output directly to your PLC proceed to Section 3 0 Equipment Required f JF 1 Serial Test Cabl...

Страница 47: ...or and will not exactly be equal to the range f As we are changing the range to 1000 pS m full scale we can make an initial assumption the DAF value will need to 20 higher than the span of interest i...

Страница 48: ...5 volts for the 100 ohm sense Note the user may be required to disconnect the serial port connections to attain the zero value this is due to the amount of current consumption required by the connecte...

Страница 49: ...ingle line of data from the JF 1 Sensor Or turn the unit on add see the turn on banner being received d Place the unit in open mode using the O command followed by the enter key Verify the unit is in...

Страница 50: ...he COND command i After steps 5 6 are complete the user should now check the low end of the range to ensure the slope adjustment has not resulted in significant errors of the low end j To test this va...

Страница 51: ...e for a specific application The JF 1 is nominally set for 20 C 60 C representing the output range of 4 20 mA This is detailed in Table 2 below WARNING CONSULT THE SAFE USE MANUAL FOR SAFE AMIBENT OPE...

Страница 52: ...ual in series with either the 100 or 200 ohm sense resistor to the temperature loop terminals 2 Power the JF 1A either from the conductivity loop or from the 4 wire connection port Note the power supp...

Страница 53: ...the TDAF value will need to be lower i e TDAF 65 5 This value is temporarily entered into TDAF by sending TDAF 65 5 9 To test this value we need only to set conductivity to our desired full scale valu...

Страница 54: ...ease the value if the voltage is low TDAO is set using the TDAO XXX where XXX is the new entry Repeat these unit the correct voltage current is attained 14 Full scale can then again be checked using t...

Страница 55: ...offset value TRL enter the request TRL the unit will return TRL 20 where 20 is the current setting as we want to change the lowest value to b 0 C we need to change TRL to 0 enter the comment TRL 0 sto...

Страница 56: ...of the range to ensure the slope adjustment has not resulted in significant errors of the low end 27 To test this value we need only to set conductivity to our desired 4 mA value by sending TEMP 0 to...

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