Instruction Manual 2009
Rev 3
DFS2 Doppler Flow Switch
5
Trouble Shooting
Relay Operates With No Flow
Possible Cause
- Trip points set too low
- Vibration on pipe
Corrective Action
- Adjust trip points above 0 m/s
- Relocate transducer
- Use Neoprene rubber pad in transducer
mounting
Relay Does Not Operate
Possible Cause
- High trip point set below low trip point
- Unit faulty
Corrective Action
- Adjust high trip point above low trip point
- Return unit to factory
Signal Strength LED Not Illuminated, or Flickering slowly
Possible Cause
- No flow
- Insufficient suspended solids in fluid
- Bad coupling of transducer
- Incorrect transducer connections
Corrective Action
- Confirm flow
- Inject air into pipeline
- Check transducer mounting
- Check transducer connections
