4. mV Calibration
The mV section is factory calibrated. There is no user-calibration facility for this
mode.
5. Temperature Calibration
The temperature readout must be calibrated or manually set before attempting pH
calibration. The decimal point in the temperature reading is replaced by a " ∗∗ " if
the reading is not calibrated.
5.1 Calibration Procedure
1. Switch the 901-PH on and select Temperature mode (see section 2).
2. Plug the temperature sensor (Part No 121245) into the Temp socket.
3. Place the sensor alongside a good quality mercury thermometer into a
beaker of room temperature water. Stir the sensor and the thermometer
gently to ensure an even temperature throughout the beaker.
4. When the reading has stabilised, press the key.
5. The 901-PH now enters temperature calibration. For example…
Enter True TempEnter True Temp
then:
26*0 26*0
oo
c c ↑↑ 25.0 25.0↓↓
6. Press the and keys until the display shows the same temperature as
the mercury thermometer.
7. Press the key to calibrate the temperature readout.
Alternatively, press the key to abort temperature calibration.
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