horiba TW-150 Instruction Manual page 172

7 MAINTENANCE
3. Remove the protective cap, liquid junction washer, rubber cap and connector cap
from the new pH sensor.
4. Push the brown protrusion on the side of the sensor into the pH cell, as shown in
the following figure, and turn the sensor to the left.
Note
The pH sensor top is made of glass. Take care not to break it when pushing the sensor in.

Be careful not to loose the protective cap, liquid junction washer, rubber cap and connector cap

as they are used to store the sensor.
5. Connect the pH sensor to the connector.
Storing the removed pH sensor

1. Soak the sponge of the protective cap in pure water.
2. Fit the cap onto the receptor glass.
3. Place the washer at the bottom of the protective cap, and attach it to the pH sensor.
For details, see the operating manual for the pH sensor.
146
Rubber cap
Liquid junction washer
Protective cap
pH cell
pH sensor
Brown protrusion
Connector cap
Stop valve
must be closed.