Hach ORBISPHERE 3658 Manuel D'utilisation Simplifié page 22

A thermistor at the top of the sensor (position No 1) is used to
measure the sample temperature, and an air duct (position No 2) is
used for the purge gas inlet. Do not bend or damage either of these
components by trying to twist the flow chamber off the sensor.
Unscrew the protection cap, using the tool provided in the maintenance kit.
Never remove the protection cap, unless you plan to replace the
membrane.
Pull up the membrane holding ring with the tool provided in the maintenance
kit.
Remove the old membrane and discard it.
7.3.2 Installing the membrane
To install the new membrane, follow the steps below:
The membrane mounting surface must be clean and even (on top of the
sensor, where the membrane and sensor have contact).
Replace the membrane O-ring on the sensor head with a new one.
Note: The 29039.0 Nitril O-ring can be reused if it is still in good condition. Membrane O-rings are part
of the protection cap kit.
In the maintenance kit, pick up the two part membrane mounting tool.
Install the sleeve over the sensor head (end with shoulder downwards).
Note: Once installed, a membrane cannot be reused. Avoid touching the membrane with bare fingers,
as this may affect its sensitivity.
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