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ST100 Series Flow Meter
TROUBLESHOOTING
Fluid Components International LLC
43
If you are troubleshooting the flow meter and the readings are good, the flow transmitter is good and the problem may involve the flow element
or interconnecting cable. If the readings are off, a flow element calibration may be required or the flow transmitter needs to be setup. Contact FCI
Customer Service.
Heater Current Check
The heater current can be checked at TP1 on the FES-200. Set the DMM to measure VDC.
1. Connect the positive lead of the DMM to TP1 on the FES-200
2. Connect the negative lead of the DMM to the HTR EXC terminal of the flow transmitter.
The measured mV value of heater current will be 10x larger than the actual mA heater current. For example, 750 mV indicates 75 mA heater current.
The measured value of heater current must be within ±0.15 mA of the factory set value. See table below.
FCI Transmitter Model
Factory-set Heater Current
DMM Reading
ST100
90 mA
900 mV
ST100
75 mA
750 mV
Heater Current
Figure 20
1-5 Volts, Connect DMM Across 250
Ω
Resistor (A)
Figure 21
4-20 mA, Connect DMM in Series (B)
5. Turn power ON and allow the instrument 10 minutes to stabilize.
6. Verify the transmitter is in the calibration group matching the Delta R data sheet.
7. On the FES-200, dial in a Delta R value with the thumbwheel from the column marked Delta R (ohms) on the Delta R data sheet. Compare
to the output value column (VDC Across 250 Ohms or mA Output) and/or the Indicated Display column. Verify that the meter reading is
within the stated tolerance of the flow transmitter. See examples 1, 2 and 3 at the end of this section, as applicable.
8. Repeat for each point on the Delta R table, except for the step value and zero value.
9. Turn power OFF and disconnect the FES-200 and DMM. Reconnect the sensor element connector.
10. Close the enclosure, making sure none of the wires are strained. Ensure any seals and gaskets are properly installed.
11. Restore power to the meter.
Содержание ST100 series
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Страница 80: ...APPENDIX C ADDITIONAL INFORMATION ST100 Series Flow Meter 74 Fluid Components International LLC ...
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Страница 94: ...APPENDIX E APPROVALS ST100 Series Flow Meter 88 Fluid Components International LLC Intentionally Left Blank ...