ONICON F-5100 Insertion - Manual (Page 26)

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F-5100 Insertion Thermal Mass Flow Meter Manual 05/15 - 0663-20 / 18333 Page 26
SECTION 5.0: TROUBLESHOOTING GUIDE
NOTE: Also refer to the START-UP AND COMMISSIONING GUIDE located on page 24.
REPORTED PROBLEM POSSIBLE SOLUTIONS
No signal • Verify that the sensor is properly inserted into the pipe.
• Verify that the electronics enclosure is parallel with the pipe.
• Verify supply voltage.
• Verify correct wiring to control system (see wiring diagram).
• Verify that there is flow in the pipe.
• Please contact ONICON for further assistance.
Reading is too high or
low • Verify pipe size. Contact ONICON if pipe size is different from that
shown on the sensor tag.
• Verify that the sensor is properly inserted into the pipe.
• Verify that the electronics enclosure is parallel with the pipe.
• Verify correct wiring to control system (see wiring diagram).
• Confirm that the control system is programmed for correct flow range
or pulse scale factor.
• Verify that the sensor cable shield is connected to earth at the control
system. Lack of proper shielding can lead to excessive noise that can
affect the flow reading.
• Verify that the sensor is connected to earth.
• Check for ground loop or offset voltage: Disconnect analog signal
input from control system and measure analog output directly from
the flow sensor. Reconnect signal input to control system and measure
the analog signal again. Any difference between these readings
indicates a potential ground loop or offset voltage.
• Sensor may be contaminated. Remove sensor from pipe and wipe off
or clean with mild detergent and water.
• Sensor is being used to measure flow of a different gas or gas mix than
the sensor was specified and calibrated for.
• Please contact ONICON for further assistance.
Erratic readings • Confirm that the sensor is connected to earth and all cabling is
properly shielded.
• Please contact ONICON for further assistance.