Bronkhorst CORI-FLOW User Manual download pdf (Page 26)

BRONKHORST CORI-TECH B.V.

7 TROUBLESHOOTING

7.1 General

For a correct analysis of the proper operation of a CORI-FLOW meter or controller 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, this can be ascertained immediately by loosening the compression type couplings and, if applicable the

flange on the inlet side.

Furthermore remove the two covers and check if all connectors are fixed properly. Energising or de-

energising of the instrument indicates whether there is an electronic failure. When powering up the red LED

is on and the green LED is flashing for a second or two. Then the instrument should go in normal operation

mode. See document number 9.17.023 for detailed description of the LED indication.

After that, fluid pressure is to be applied in order to check behaviour.

7.2 Troubleshooting summary general

Symptom

Possible cause

Action

No output signal

No power supply

1a) check power supply

1b) check cable connection

Output stage blown-up due to long lasting

shortage and/or high-voltage peaks

1c) return to factory

Supply pressure too low, or differential pressure

across meter too low

1d) increase supply pressure

Valve blocked/contaminated

1e) connect 0 .. 15 Vdc to valve and slowly

increase voltage while supply pressure is ‘on’.

The valve should open at 7V ± 3V; if not open,

then clean parts and adjust valve (qualified

personnel only)

Screen in inlet fitting blocked

1f) clean screen

Sensor failure

1g) return to factory

Maximum output signal

Output stage blown-up

2a) return to factory

Sensor failure

2b) return to factory

Output signal much lower than

setpoint signal or desired flow

Screen blocked/contamined

3a) clean screen

sensor blocked/contaminated

3b) clean sensor with a gas or fluid

Valve blocked/contaminated

3c) clean valve

Valve internal damage (swollen seat in plunger)

3d) replace plunger assembly and adjust valve

or return

Incorrect type of gas is used and/or pressure/diff.

pressure is to low

3e) try instrument on conditions for which it was

designed

Flow is gradually decreasing

Condensation, occurs with

, hydrocarbons

such as

H ,C

3 8 4 10

etc.

4a) decrease supply pressure and/or heat gas

to be measured

Valve adjustment has changed

4b) see ‘1e’

Oscillation

Supply pressure/diff. pressure too high

5a) lower pressure

Pipeline too short between pressure regulator

and Cori-Flow

5b) increase length or diameter of piping

upstream

External vibration is present

5c) Remove external vibration

Valve sleeve or internals damaged

5d) replace damaged parts and adjust valve,

see ‘1e’ or return to factory

Controller adjustment wrong

5e) adjust controller

Software like FLOWPLOT can be used to do

this. Please contact the distributor for details.

Small flow at zero setpoint

Valve leaks due to damaged plunger or dirt in

orifice

6a) clean orifice and/or, when replacing plunger

assembly, see ‘1e’

Pressure too high or much too low

6b) apply correct pressure

Zero procedure not done

6c) Zero the instrument

High flow at zero setpoint

Damaged diaphragm (only applicable to valves

with membrane)

7a) replace membrane seal

Zero procedure not done

7b) Zero the instrument

Disturbances in the flow

Gas in the system

8a) Purge the system

Expansion of liquids to gasses

8b) Check properties fluid used

Calibration error

Zero procedure not done

9a) Zero the instrument

Gas in the system

9b) Purge the system

Measure time to short

9c) Measure long enough to get a reliable

measurement

Right reference instrument

9d) The Cori-Flow is a mass-flow

meter/controller and should not be checked with

a volume-meter.

Note: For other (more specific) problems see also troubleshooting parts in other documents.

page 26 9.17.031

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Bronkhorst CORI-FLOW User Manual Page 26

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