Symptom Solution
1. 1. Ground shield of signal cable
2. Re-route cable from high electrical energy sources
2. 1. Remove source of air or gas entrapment
2. Install an upstream air eliminator
3. 1. Increase back pressure on pump
2. Install a fast response one way check valve
3. Install a surge arrestor between pump & meter
4. Re-calibrate meter in situ to compensate for pulsations
5. Change pump style to smooth delivery type pump
1. Damaged or 1. Inspect, repair, clean or replace rotors
worn rotors
2. 1. Inspect measuring chamber for damage - repair
2. Check concentricity of rotor shafts within chamber
3. 1. Ground shield of signal cable
2. Re-route cable from high electrical energy sources
3. Check all electrical terminations & wires for continuity.
1. Rotors fouled 1. Check that rounded teeth are towards base of chamber
2. Check for obstruction due to foreign particles
3. Clean, repair or replace rotors
2. 1. See instructions for reassembly of meter with
particular emphisis on positioning of rotors & magnets
3. 1. Check terminal connections & solder joints
2. Ensure dc voltage is available at Vdc & 0v and
receiving instrument is fitted with a pull up resistor
3. Replace output board
1. 1. Check DIP switch settings & program data
2. Check terminal connections & electrical continuity
3. Repair / replace receiving instrument
Possible cause
Output signal
interference
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