PULSAR MEASUREMENT
35
FIELD TROUBLESHOOTING
The AVFM 6.1 uses an ultrasonic level sensor to determine flow area and an ultrasonic Doppler sensor to measure
flow velocity.
The QZ02L sensor combines both sensors in one housing.
An optional configuration uses the PZ15-LP “down-looking” level sensor and a QZ02L-B velocity sensor.
To troubleshoot the AVFM 6.1, verify correct operation of level and velocity measurements separately.
Note: Selecting “
Restore Defaults
” in the
SPECIAL FUNCTION
menu will return the
instrument to “as-shipped” factory settings.
LEVEL (QZ02L SENSOR)
SYMPTOMS
FAULTS
SOLUTIONS
EC percent at zero
- very turbulent flow
- very aerated flow
- relocate sensor or use PZ15-LP
- sensor not level
- level sensor with “Bullseye” level
- sediment/dirt/grease build-up on
sensor
- clean sensor with liquid soap
Level Inaccurate
- sensor not mounted at bottom of
pipe/channel
- set a “Lvl Offset” in Calibration
menu
VELOCITY (QZ02L SENSOR)
SYMPTOMS
FAULTS
SOLUTIONS
No velocity reading
- grease/sediment on sensor
- improper hook-up
- not enough suspended solids or
aeration in water.
- water too clean for Doppler
- clean sensor with detergent
- check sensor connections
- drop Alka-Seltzer tab into flow
stream to create bubbles to
verify lack of air in pipe.
- perform bucket test to prove
Doppler works.
Velocity reading too High/Low
- poor velocity profile in
channel/pipe
- Cal Constant changed
- release sensor per suggestions in
sensor location section
- change Cal Constant in
Calibration menu
