Sub MkIIIF
User Manual
Int. Approved
Document ref: ASF3-800-08
November 2018
Page 54 of 79
Copyright © 2009 Analox Ltd. All Rights Reserved.
Commercial in Confidence
the value of the set-point by a step change pre-defined within the instrument. The value is limited
by a pre-set minimum and maximum value. Pressing F3 (SET) will programme the new set-point
into the instrument, and return to the previous menu. Alternatively pressing RESET will restore the
value to that before making any changes. Press BACK to return to the previous menu without
making any changes.
To effectively disable an alarm, adjust it’s
set-point to a value that the sensor is unlikely to
measure. For instance, an absolute pressure sensor could be set to 0.5 BarA in a system that was
never expected to be less than 0.8 BarA.
8.4
Calibration Menu
WARNING: INCORRECT USE OF THE CALIBRATION SYSTEM
AFFECTS THE ACCURACY OF GAS /PRESSURE
MEASUREMENTS. ONLY TRAINED PERSONNEL
SHOULD USE THESE FEATURES.
The calibration menu provides the user with the facility to calibrate each of the sensors. The
figures that follow show the calibration options available. The use of these functions will be further
discussed in the Calibration section (Section 10).
Within this section, all that needs to be noted for now is that the calibration data is adjusted in a
very similar way to the alarm set-points, using the UP/DOWN/SET and RESET keys. In order to
avoid accidental calibration, when SET is pressed, a confirmation is required that the user does
indeed intend to calibrate the sensor. A command is then sent to the appropriate sensor to
calibrate.
Note that CO2 is a slightly special case. When performing a zero, there is no screen to define the
calibration value. It is assumed to be zero always. Therefore the user is only asked to confirm that
the calibration should be performed.
Quick calibration is a facility to make calibration of oxygen and carbon dioxide a little easier. It is
usual to carry two gases
–
oxygen (Gas1) to both span O
2
and zero CO
2
, and a CO
2
gas in N
2
or
Helium (Gas 2) to zero oxygen and span CO
2
. Quick Calibration allows the O
2
and CO
2
sensors to
be calibrated at the same time, requiring far fewer button presses than doing the two tasks
individually. However, the gas calibration data must have been entered once previously for this to
happen. Do this whenever changing from one supply of calibration gas to another with a different
concentration.
Summary of Contents for Sub Mk III F
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