ATA Pro
Technical Manual
Int. Approved
Document ref: HEL-810-12
December 2017
Page 5 of 27
Copyright © 2017 Analox Ltd. All Rights Reserved.
Commercial in Confidence
The low battery warning is a shown by ‘bAt L’ on the display. When present,
change the battery before using the instrument (see section 5.0 After Sales
Service).
Waterproof calibration and zero adjustment knobs are located on the front of the
instrument for Oxygen and Helium sensor adjustments. Turn them fully from left
to right and then fully left, the reading should increase and then decrease. (If
the reading does not change see section 4.0 Quick Check). When the Helium
sensor adjustment is fully left the instrument display may show ‘Err’, this is not
a fault if the display returns to numbers when the adjustment is set to the mid-
point
WARNING
Do NOT use when the LOW BATTERY symbol is on!
3.2
Oxygen Sensor Calibration
Oxygen sensor calibration in clean air is essential before every use and is
performed as follows;
1. Remove the flow adaptor from the sensors.
2. Expose the analyser to clean air for two minutes and adjust the calibration
knob until the display reads the correct value using the oxygen
compensation chart (you can find this chart on the inside of the back
cover). If this is not possible refer to paragraph 3 below or to sections 4.0
Quick Check and 5.0 After Sales Service.
O
2
calibration in clean air
