Onicon F-5100 Insertion Manuel d'utilisateur télécharger pdf (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 ow 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).

• Conrm that the control system is programmed for correct ow 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 ow 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 ow 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 ow of a different gas or gas mix than

the sensor was specied and calibrated for.

• Please contact ONICON for further assistance.

Erratic readings • Conrm that the sensor is connected to earth and all cabling is

properly shielded.

• Please contact ONICON for further assistance.

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Onicon F-5100 Insertion Manuel d'utilisateur Page 26