ADM, HBOT & Sub Aspida
User Manual
Int. Approved
Document ref: PSA-811-14
June 2017
Page 26 of 43
Copyright © 2017 Analox Ltd. All Rights Reserved.
Commercial in Confidence
1 x 20l 100% N2
1 x Fine control valve and tubing
9100-1060RK
Replacement O2 sensor and extraction kit
6.2
Calibration
The sensors within the
Aspida
device should be calibrated periodically to compensate for the effect of
aging. It is therefore important that the sensors are periodically re-calibrated.
The regularity of calibration depends upon the sensor.
•
Carbon dioxide sensors should be calibrated every 12 months.
•
Oxygen sensors should be calibrated every 3 months and also when a new sensor is installed.
Additionally, if the unit is dropped or accidentally immersed this can affect the oxygen sensor
calibration so recalibration may be required. See section 6.5 below in case of accidental
immersion.
Since charging the batteries causes the unit to heat up which in turn causes some variation in readings,
it is inadvisable to calibrate the unit when actively charging the batteries or soon after.
6.3
Sensor calibration
Each Aspida offers an on-device calibration feature. The set of calibrations available on each Aspida
type are shown in the table below. In order for a calibration due notification to be cleared for a particular
sensor, the user must perform all of the calibrations available for the sensor. For example, an ADM
Aspida requires both a low and high oxygen calibration to be performed using calibration gas in order
to clear a calibration due notification, whereas a Sub Aspida and a HBOT Aspida need only a high
oxygen calibration in fresh air.
Aspida type
Carbon dioxide calibrations
available on device
Oxygen calibrations available
on device
Sub Aspida
High and low
High cal (fresh air) only
HBOT Aspida
High and low
High cal (fresh air) only
ADM Aspida
High and low
High and low
To perform a sensor calibration:
1)
Press the
button to access the device menu.
2)
Use the
button multiple times to highlight the
icon (initially off the display to the
right) and press
.
3)
Using the
and
. Buttons and and icons, adjust the displayed value to the correct
calibration value corresponding to the calibration gas used.
WARNING:
Always ensure that the calibration gas is suitable for use. Inaccuracy in calibration
of the unit will cause an inaccuracy of the displayed and alarmed values. Certified calibration
gas should always be used when calibrating CO
2
sensors.
HBOT Aspida:
For accurate measurements of high concentrations of O
2
Analox would
recommend that the device is calibrated on 100% O
2
.
