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www.h2flow.net
10.
alarm information
PCB of electromagnetic flow meter converters uses SMT, so the user cannot service or open the shell of the converter.
FM750 Intelligent converters have a self-diagnose function. Without impacting the power and hardware circuitry, the unit will
raise an alarm when any issue arises. This information is indicated on the left side of the display as follows:
SYS
-- System Excitation Alarm
HIG
-- Flow Upper Limit Alarm
REV
-- Reverse Flow Removal Alarm
ABN
-- Abnormal Suppression Alarm
FST
-- Noise Sensitivity Alarm
CUT
-- Small Signal Excision Alarm
MTP
-- Fluid Empty Pipe Alarm
LOW
-- Flow Lower Limit Alarm
PSM
-- Peak Suppression Alarm
11.
troubleshooting
Symptom
Probable Cause
Solution
Measurement is not
accurate
1. Parameter is incorrect
Check the parameters (Transmitter, K-factor and size)
2. Pipe is not fully filled
Check if meter is fully filled
Flow rate indication is
unstable
1. Grounding issue
(1) Make sure the meter is properly grounded to earth
(2) Please use a Ground Ring when the pipe is not conductive, such as with
PVC or other types of plastic pipe
2. Air
Make sure fluid does not contain air bubbles
3. Converter location - outside electrical
interference
Make sure the converter is not too close to sources of electrical
interference
No display
1. No power
Apply correct power
2. Incorrect power
Check the power value
3. Wiring connections
Check power input / output connections
4. Fuse blown
Replace fuse
5. Contrast of LCD is too low
Increase the contrast
Empty Pipe Alarm
1. The pipe is not filled with fluid
Increase the flow rate
2. Electrode was polluted
Clean the electrode if voltage of DS1 and DS2 > 1V
3. Fluid’s conductivity is not high enough
If connecting terminals SIG 1, SIG 2, and SIGGND results in the alarm
stopping, then the fluid’s conductivity is not high enough for this flow meter.
