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5. pH Calibration

5.1 Calibration Procedure

1. Plug the pH sensor into the pH socket. Temperature measurements

are made via the Conductivity sensor, so this needs to be connected

for Automatic Temperature Compensation.

2. Switch the meter on.

3. Ensure that temperature has been calibrated or manually set (see

sections 7.1 & 7.4). If the decimal point in the temperature reading is

shown by a ““, then the temperature value is not calibrated.

4. Remove the wetting cap from the pH sensor. Rinse the pH and

Conductivity sensors in distilled water and blot them dry.

5. Ensure that you are using buffers which have been selected for

automatic buffer recognition. See section 17 for a detailed

explanation.

6. Place both sensors into a small sample of pH7.00 (or pH6.86) buffer,

so that the bulb and reference junction are both covered, as per the

diagram below. DO NOT place the sensors directly into the buffer

bottle.

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TPS WP-81 Specifications

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