3.3
SECTION 3 OPERATION
This section contains a detailed description of the full operating procedure of the 1100A
analyser. Before operating the analyser it is advisable to check that the various services,
sample and calibration gases are correctly connected and leak tight.
Some of the procedures described in this section are only available when certain options are
fitted.
3.1 OPERATING PRINCIPLE
With the exception of the mechanical zero adjustment on the Transducer unit, which normally
only requires adjustment after changing the cell, the analyser contains no analogue
adjustments. All functions are done by the keyboard which has sealed pressure sensitive
keypads.
There are three modes of control:
1. Oxygen - The display shows the oxygen concentration to two decimal
places.
2. Display mode - Used for displaying information, e.g. alarm levels. The
display changes to, for example;
10.00 41
Where 10.00 is a low oxygen alarm level and 41 is the
'Parameter Number' associated with low oxygen alarm.
3. Operator mode - Used for changing information. The display has the same
format as in the DISPLAY mode.
A password has to be entered before the operator mode can
be used to prevent unauthorised alteration of the analyser
parameters.
In both the Display and Operator modes the display changes to show a two digit parameter
code number on the right and its associated value on the left. Day to day operation is carried
out using the coloured keys which duplicate the parameter numbers. A full listing of parameter
numbers is given in Appendix 3.
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