ANALOX Sub Mk III F, Руководство пользователя

Страница: 66 / 79

Sub MkIIIF
User Manual
Int. Approved
Document ref: ASF3-800-08 November 2018 Page 66 of 79
Copyright © 2009 Analox Ltd. All Rights Reserved.
Commercial in Confidence
10.5 Carbon Dioxide Sensor Calibration
The CO2 range will depend on the application. Calibration is best performed at atmospheric
pressure using 0% CO2 (eg air or oxygen or nitrogen, or helium) and typically CO2 concentration
equivalent to around 50%-90% of the scale eg 1.0- 1.8% CO2 for a 20mBar pCO2 sensor.
In saturation diving applications, it is best to use helium based gases for CO2 calibration.
1 Fit the supplied calibration adaptors to the sensor inlets and pass calibration gas
containing no carbon dioxide (typically calibrated air 20.9% or nitrogen or 100%
oxygen, or pure helium) across the sensors at a flow rate of approximately 20-60 litres
per hour (0.3-1.0 litres per minute)
2 Wait for the sensor reading to stabilise
3 From the Main menu press CALIB, REM1, CO2, ZERO
4 Confirm calibration by pressing YES.
5 Observe after a few seconds that the carbon dioxide reading adjusts to zero.
6 Now pass a certified calibration gas (see note above regarding scale of sensor) across
the sensors at a flow rate of approximately 20-60 litres per hour (0.3-1.0 litres per
minute)
7 Wait for the sensor reading to stabilise
8 From the MAIN menu press CALIB, REM1, CO2, SPAN and adjust the gas concentration
to the desired value (e.g. 1.80%) The actual gas can be in the range 0.10-2.00%
(depending on range)
9 Press SET to inform the remote sensor of the calibration gas value.
10 Confirm the action by pressing YES
11 Observe after a few seconds that the carbon dioxide reading adjusts to the new
calibration value (taking the pressure into account).
12 Remove the calibration flow adaptors after use and confirm that the sensor readings
are sensible for the atmosphere in which they are exposed.