Maintenance and Service
6.4 Calibration Verification
LDS 6
72 Operating Instructions, 01/2009, A5E00295894-05
To clean the wedge windows proceed as follows:
1. Release the lock ring closest to the process – use an appropriate tool – and pull the
sensor out.
2. Clean the window on the wedge tube. If the optical lens needs cleaning the second lock
ring needs to be released. Extra care should be taken since the lens is anti-reflection
coated and sensitive to scratches.
3. Clean the optical surface with a soft cloth or window cleaner containing ammonia. Soap
water also works fine in many cases. Start at the centre and work with circular
movements towards the rim.
4. Remove all dust 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 purging
flange. Screw on the lock ring and tighten it gently with the tool.
If this operation is performed properly, it will not affect the alignment of the sensor.
6.4 Calibration Verification
For ammonia (NH
3
) a calibration check of LDS 6 analyzer can be done using a reference cell
arrangement containing a mixture of the measurement gas and nitrogen. The unit should be
used in conjunction with the 2 meter hybrid cable that is delivered with each calibration
verification kit. This calibration check is described in a specific instruction.
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