4.3
Table 4.2 Setting low and high calibration tolerances
L MENU to obtain top level menu
CALIBRATE/
SETUP
ALARMS/FAULTS
L < ENTER
SET ALARM/ASSIGN
DISPLAY/UTILITY
L ? < ENTER
ENTER PASSWORD
0000
To change the value of a digit L > or ?
To change to another digit L = or <
When the number shown is correct L ENTER
UTILITY 1
UTILITY 2
L ? ENTER
UTILITY 2
I1 Oxygen % 8
To select desired gas sensor module
L > or
?
then L ENTER, if only one module is fitted
this section will be omitted.
LOW & HIGH TOL L ENTER
I1 Oxygen LO TOL
00.00 % OF FSD
Enter the required low calibration tolerance.*
Any digit position may be used for the decimal
point.
To change the value of a digit
L > or ?
To change to another digit L = or <
When the value shown is correct L ENTER
I1 Oxygen HI TOL
00.00 % OF FSD
Enter the required high cal tolerance.*
Any digit position may be used for the decimal
point.
To change the value of a digit L > or ?
To change to another digit L = or <
When the value shown is correct L ENTER
LOW & HIGH TOL L MEASURE to return to measurement
display.
* The tolerance must not be greater than 10% FSD, if an illegal figure is entered
a prompt to enter a new number will be given.
4.4 Paramagnetic transducer low and high manual calibration
The low calibration gas for paramagnetic gas sensor modules may be specified
between -3% and +3% oxygen. This is to allow for the situation where the background
gas affects the paramagnetic zero (Appendix D). Zero grade nitrogen is recommended
for low calibration. See Section 2.11 for further discussion of recommended calibration
gases.
The high calibration gas can be in the range 5 to 100% oxygen. For the Pm1156
transducer a high calibration gas with approximately 21% oxygen is recommended.
Care should be taken when measuring gases with an oxygen content greater than the
high calibration gas.
The procedure for performing a paramagnetic low and high manual calibration is given
in table 4.3.
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