Service Instructions; The Sensors; Instruction: Cleaning The Wedge Windows - Siemens LDS 6 Operating Instructions Manual

Instructions for Maintenance and Service
ATEX manual for LDS 6
A5E01206710-02
3.2

Service Instructions

The following sections give step-by-step instructions for mainte-
nance and service tasks for the LDS 6 ATEX sensors.

3.2.1 The Sensors

Cleaning the Wedge Windows
If the transmission for a channel drops below the level set by the
user, the transmission alarm will be activated. This means that
the sensors for this channel are in need of service (cleaning of
the optical surfaces and aligning the sensors).
Before the sensors are removed make sure that:
•
If there is steam purging – make sure it is turned off.
NOTE
It is very important to turn off the steam since overheated steam is
invisible and can cause severe burn injuries.
•
No hazardous or hot gases can escape from the process.
•
Appropriate protection against hot surfaces on and around
the sensor is used.
Then use the following steps to clean the wedge windows:
1. Remove the quick connect (use the hook spanner from the
Sensor Alignment Kit) and pull the sensor out.
2. Clean the window on the wedge tube. If the optical lens
needs cleaning, extra care should be taken since it is anti-
reflection coated and sensitive to scratches.
3. Clean the optical surface with a soft cloth or window cleaner
containing ammonia. Soapy water also works well in many
cases. Start at the centre and work with circular movements
towards the rim.
4. Remove all particles using pressurized air or flushing water.
5. When the sensor is re-installed make sure that the guide pin
fits the hole on the intermediate tube. Mount the quick con-
nect and tighten it with the hook spanner.
This operation is recommended to be followed by checking the
sensor alignment, since it may cause the sensors to slightly
change position.
23