Dwyer Series PUF - Manual (Page 48)

5: Troubleshooting
44
Automatic signal loss recovery
If the signal is lost or the Quality falls below 40%, the set up procedure, normally invoked by Read Flow in the
main menu, is automatically run until a good quality signal is found.
5.2 General Troubleshooting Procedure
Figure 5.1 Troubleshooting chart
Is the display blank?
Recharge the battery.
If battery won't recharge then
replace the charger (if faulty) or
return the instrument for repair.
No
Turn instrument OFF/ON.
If the display is still scrambled/
hung up press the microprocessor
reset button. Return instrument
for repair if fault still present.
Yes
Is the display
scrambled or
hung up?
Yes
Measurement differs from expected value. Unstable measurements. No (or poor) signal.
Problem probably due to non-constant fluid flow.
Check the following:
- the pipe data has been entered correctly.
- the fluid type has been entered correctly.
- the correct transducer type has been selected.
- the pipe diameter is within specifications of the
selected transducers.
- the pipe is completely full.
- the pipe surface is not corroded, or protective
surface loose.
- no particles in the fluid.
Ensure the temperature is set correctly.
Ensure that the transducer cables are connected
correctly.
Ensure transducers are positioned in accordance
with the recommended distance from bends etc.
Ensure flow velocity >0.1m/s.
Ensure that sufficient acoustic couplant has been
applied to the transducers.
If triple reflex mode is selected, try selecting
double or single reflex instead.
Check the instrument using the test block.
No
START
Are any
status messages
shown?
No
Note any active messages.
Refer to the message table in this
chapter to interpret the message
and view suggested response.
Yes