9. Initialising the 901-PH
If the calibration settings of the 901-PH exceed the allowable limits, the unit may
need to be initialised to factory default values. This action may be required if the
sensor is replaced.
To initialise the 901-PH…
1. Switch the 901-PH OFF and wait for 10 seconds.
2. Press and hold the key while switching the 901-PH back on.
3. The following messages are now displayed…
InitializingInitializing
then:
901PHs V5 R1234901PHs V5 R1234
(The "ss" after "901PH901PH" is shown when the optional RS232 port is fitted.)
4. The 901-PH now goes on to pH mode. Note that a " ∗∗ " replaces each of the
decimal points in the pH and Temperature readings, indicating that the unit
requires calibration.
Note: When the 901-PH is initialised, automatic buffer recognition is re-set to
pH4.00, pH6.88 and pH9.23. See section 8 if you wish to select pH7.00
buffer instead of pH6.88 and pH10.01 instead of pH9.23.
When the optional RS232 port is fitted, the Baud Rate is set to 9600 and
the Send Rate is set to zero. See sections 6.1 and 6.2 for details if these
settings need to be altered.
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