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Troubleshooting and service, 1 general, 2 led indication – Bronkhorst IQ+FLOW (till 01-07-2013) User Manual

Page 27: 3 troubleshooting summary general, General, Led indication, Troubleshooting summary general

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9.17.045

page 27

5. Troubleshooting and service

5.1 General

For a correct analysis of the proper operation of a flow meter it is recommended to remove the unit from the process

line and check it without applying fluid supply pressure. In case the unit is dirty or clogged, this can be ascertained

immediately by loosening the fittings and inspecting visually.

Energizing or de-energizing of the instrument indicates whether there is an electronic failure. After energizing, fluid

pressure is to be applied in order to check behaviour. If there should be suspicion of leakage, do not disassemble the

sensor for inspection but contact your local distributor for service or repairs.

5.2 LED indication

The red LED on the instrument gives error or warning information.

Red LED

Time

Indication

Off

Continuously

No error

On

Continuously

Critical error message

A serious error occurred in the instrument

Instrument needs service before further use

5.3 Troubleshooting summary general

Symptom

Possible cause

Action

No output signal

No power supply

Check power supply and hook-up

Check cable connection and hook-up.

Check status of LED’s

(see manual 9.17.023)

Cable damaged or hooked-up

incorrectly

Check and compare signals at both ends

of cable.

PC-board damaged due to long lasting

shortage and/or high-voltage peaks

Return to factory

No or too low inlet pressure

Increase inlet pressure

Open shut-off at inlet and outlet

Supply pressure too high, or differential

pressure across meter too high

Reduce supply pressure

Sensor failure

Return to factory

Maximum output signal

Sensor failure

Return to factory

Output signal much lower than

setpoint signal or desired flow

Incorrect type of fluid or too low inlet

pressure

Test instrument on conditions for which

it was designed

Oscillation / Signal noise

Pressure regulator of supply pressure is

oscillating or wrong sized

Replace pressure regulator

Small flow indication when

flow is definetly zero

Increased zero reading without flow

caused by raised zero-point

Perform an auto-zero action

No digital communication

Occupied or wrong bus address

Change address with software

For more information check the instruction manual for digital communication 9.17.023 at

http://www.bronkhorst.com/en/downloads/instruction_manuals/