Multi 197i Operation
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4.3.2 Measuring the pH value
AutoRead AR
(Drift control) and hold
function
The AutoRead function (drift control) checks the stability of the mea-
surement signal. The stability has a considerable impact on the repro-
ducibility of the measured values. With the aid of the hold function the
measured value display is frozen.
With identical measurement conditions, the following criterion is valid
for the AutoRead function:
For D. O. measurements, use the AutoRead function and hold function
like this:
1 Perform the preparatory activities according to section 4.3.1.
2 Immerse the pH electrode in the test sample.
3 Press the <▲> <▼> keys repeatedly until pH appears on the
status display. The pH value appears on the display.
4 When measuring without a connected temperature sensor:
Options:
z Determine the current temperature using a thermometer
and, while keeping the <RUN/ENTER> key depressed, en-
ter this temperature value with <▲> <▼>.
z TP display indicator not displayed, socket for the second
sensor is free:
Connect the second sensor (Oxi or Cond) and immerse it in
the same sample. TP flashes, the temperature is automati-
cally measured using the second sensor.
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