3.6
Transducer temperature may be checked by displaying parameter 17 (Refer to section 3.5.1).
Each time the analyser is switched on a self-check routine will be initiated. This routine will
produce various indications on the front panel display as follows:-
1. Random numbers will show and the buzzer will sound.
2. The Software Issue Number will be displayed. (See Section 3.3)
3. If software with customised default values is fitted then a 6 digit reference number will
be displayed. (Not on systems with Interface units).
4. A character check of the digits, nine to zero, at every position will be displayed.
If the self-check routine fails the keyboard bleeper will remain on and power will not be
supplied to the heaters in the Transducer unit. (Refer to section 5 in this case).
Once the self-check routine has been completed the analyser will enter the oxygen mode.
3.5 USE OF THE KEYPAD
See Figure 3.1 and Figure 3.2
The keypad contains twenty-one touch sensitive keys which are colour coded to simplify its
operation. The colour codes used are as follows:
Black - Six keys, used for calibrating.
Green - Four keys, used to set or display the span range and zero offset of
the analogue output
Blue - Five keys, for oxygen level alarm codes.
Grey - Four command keys, a decimal point, minus sign and ten numerical
keys, some of which are multi function.
NOTE: Up to S/N 1101/5199 the colour code for keys was as follows:
Yellow - Replaced by black.
Orange - Replaced by Green
Red - Replaced by Blue
Grey - Remains
The analyser is operated with two digit 'Parameter codes'. A full listing is given in Appendix 3.
For day to day operation the coloured keys duplicate the two digits.
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