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Chapter 5 Troubleshooting Series 830/840/860 Instruction Manual
5-2 IM-83/84/86-H
Flow Meters and Flow Controllers with Electromagnetic Valves
Problem
Possible Cause
Solution
No output
Clogged sensor
PCB defective
Inlet filter screen clogged
Clean or replace sensor
Repair or replace PCB
Clean or replace screen
Unit will not zero
Gas leak
Application requires high pressure and
non-horizontal mounting
PCB defective
Find and correct leaks
Re-zero transducer
Repair or replace PCB
Controller does not
respond to set point
Low or no gas pressure
Faulty cable or connector
Set point is below 2% of full scale
Set correct gas pressure
Correct or replace
Increase set point or disable auto
shut off circuit
Flow does not match set point
No gas pressure
Inlet filter screen clogged
Out of adjustment
Set correct gas pressure
Clean or replace
Adjust R22 balance on 840 models,
consult factory for others
Reads full scale with no flow
or with valve shut
Defective sensor
Gas leak
Return to factory for replacement
Find and correct leaks
Out of calibration
Dirty or clogged sensor
Change in composition of gas
Gas leak
PCB defective
LFE dirty
Inlet filter screen clogged
Incorrect inlet conditions (high flow and
NPT models)
Clean or replace sensor
See K-factory tables
Find and correct leaks
Repair or replace PCB
Clean LFE
Clean or replace screen
Re-plumb transducer correctly