Operating Instructions SS2100i-2 TDLAS Gas Analyzer
46 Endress+Hauser
Replace mirror and components
1. Carefully replace the mirror assembly onto the cell in the same orientation as previously marked.
2. Add a very thin layer of non-outgassing grease to the O-ring.
3. Replace the O-ring and ensure it is properly seated.
4. Tighten the socket-head cap screws evenly with a torque wrench to 30 in-lbs (28 m or 8 m measurement cell) or
13 in-lbs (0.1 m or 0.8 m measurement cell).
6.5.4 Replacing the stainless steel mirror
If your system is configured with a stainless steel mirror in the 0.1 m or 0.8 m measurement cell, use the following
instructions for replacing the mirror. If stainless steel mirrors are replacing another type of mirror in the field, such
as glass, the analyzer may need to be returned to the factory for recalibration to ensure optimal cell function. Refer to
Service → .
Process samples may contain hazardous material in potentially flammable and toxic concentrations.
Personnel should have a thorough knowledge and understanding of the physical properties and safety
precautions for the sample contents before operating the SCS.
All valves, regulators, switches, etc. should be operated in accordance with site lockout/tagout procedures.
The sample cell assembly contains a low-power, 10 mW MAX, CW Class 3B invisible laser with a wavelength
between 750 to 3000 nm.
Never open the sample cell flanges or the optical assembly unless the power is turned off.
Always handle the optical assembly by the edge of the mount. Never touch the optical surfaces of the mirror.
Refer to Service → if a glass mirror requires replacement. Do not attempt to replace a glass mirror with a
stainless steel mirror or system calibration may be adversely affected.
To replace a stainless steel mirror, follow the instructions for purging the sample conditioning system and removing
the mirror assembly, and replacing the mirror, below.
Purge the sample conditioning system and remove the mirror assembly
1. Power down the analyzer following the procedure outlined in the section called Powering Down the Analyzer in
the Standard documentation → .
2. Isolate the analyzer from the sample bypass flow by shutting off the appropriate valve(s) and pressure regulator.
Disconnect the sample supply and return tubes from the analyzer.
3. Purge the system with nitrogen for 10 minutes.
4. Gently remove the mirror assembly from the cell by removing the socket-head cap screws and set on a clean,
stable, and flat surface.
5. Confirm the need to replace mirror due to contamination. If yes, set mirror aside and following remaining steps.
If no, restore the mirror to the measurement cell.
Replace the mirror
1. Put on clean acetone-impenetrable gloves.
2. Obtain the new stainless steel mirror.
Fig 29. Stainless steel mirror
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