ATA Pro
Technical Manual
Int. Approved
Document ref: HEL-810-12
December 2017
Page 10 of 27
Copyright © 2017 Analox Ltd. All Rights Reserved.
Commercial in Confidence
4.
Quick Check
SYMPTOM
CONDITION
ACTION
‘bAt L’ symbol
flashing
intermittently on
display
Low battery
Change battery
No display
Switched off
Bad connection
Switch on
Check battery connection
Return to supplier
Zero reading on O2
O2 Sensor disconnected
O2 sensor polarity
incorrect
O2 Sensor expired
No Oxygen
Check connection
Check sensor is connected
correctly
Change sensor
Check in air and ensure
sensor face is free from
obstruction
‘Err’ shown on
helium display
He Zero knob turned too
far left
Helium sensor
disconnected Helium
sensor fault
Turn knob to mid point
before calibrating
Check connection
Carry out He coarse
calibration
Return to supplier
He Reading is
negative
Zero Adjust required
Adjust the reading using
the He zero pot on the
front
If still negative
Recalibrate using internal
pots
Reading erratic
Pressure on sensor
Radio transmission
Sensor old or faulty
Condensation on sensor
Check flow
Move unit away
Change sensor
Dry sensor face
Reading does not
change when
calibration knob is
turned
Faulty connections
Sensor failure
Return to supplier
Change O2 sensor
Recalibrate the Helium
sensor using internal pots
Display segments
missing
Display faulty
Return to supplier
Will not calibrate
Sensor faulty
Sensor not in air
High altitude
Change sensor
Check flow adapter is
correct Calculate percent
equivalent = 20.9% x bar
Reading drifts
Rapid temperature
change
Do not move analyser
from one temperature to
another immediately
before use