Bronkhorst LIQUI-FLOW mini (from 01-07-2013) - Manual (Page 28)

LIQUI-FLOW™ mini 9.17.065
Bronkhorst High-Tech BV
28
5 Troubleshooting and service
5.1 General
For a correct analysis of the proper operation of an instrument 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
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For more information check the instruction manual for digital communication 9.17.023 at
http://www.bronkhorst.com/files/downloads/
manuals_english/917023_operation_instructions_digital_instruments.pdf
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