Operating Instructions SS2100i-2 TDLAS Gas Analyzer
42 Endress+Hauser
6 Maintenance and troubleshooting
INVISIBLE LASER RADIATION — Avoid exposure to beam. Class 3b Radiation Product. Refer servicing to the
manufacturer-qualified personnel.
The optical head has a seal and “WARNING” sticker to prevent inadvertent tampering with the device. Do not
attempt to compromise the seal of the optical head assembly. Doing so will result in loss of device sensitivity and
inaccurate measurement data. Repairs can then only be performed by the factory and are not covered under
warranty.
This section presents recommendations and solutions to common problems, such as gas leaks, excessive sampling
gas temperatures and pressures, electrical noise, and contamination. For other issues related to the sample
conditioning system (SCS), please refer to the SCS Operating Instruction.
Contact Service if your analyzer does not appear to be hampered by one of these related problems. Refer to Service →
.
6.1 Gas leaks
The most common cause of erroneous measurements is outside air leaking into the sample supply line. It is
recommended the supply lines be periodically leak-tested, especially if the analyzer has been relocated or has been
replaced or returned to the factory for service and the supply lines have been reconnected.
Do not use plastic tubing of any kind for sample lines. Plastic tubing is permeable to moisture and other
substances which can contaminate the sample stream.
Using electro-plated coated ¼ in O.D x 0.35 in wall thickness, seamless stainless steel tubing is recommended.
The SS2100 for trace analytes utilize SilcoTek SN2000 coated tubing. SN2000-coated tubes may be used for the
sample supply. Coated tubing is not needed for instrument air, nitrogen, or sample return.
Process samples may contain hazardous material in potentially flammable and/or toxic concentrations.
Personnel should have a thorough knowledge and understanding of the physical properties of the sample and
prescribed safety precautions before operating the analyzer.
6.2 Excessive sampling gas temperatures and pressures
The embedded software is designed to produce accurate measurements only within the allowable cell operating
range. Refer to Specifications → for more information on operating ranges.
The cell temperature operating range for analyzers that are equipped with heated enclosures is equal to the
enclosure temperature set point ±5 °C.
Pressures and temperatures outside this range will trigger a Pressure Low Alarm, Pressure High Alarm, Temp Low
Alarm, or Temp High Alarm fault. Refer to the Description of Device Parameters → for more information on
alarms.
If the pressure, temperature, or any other readings on the LCD appear suspect, they should be checked against
the Specifications → .
6.3 Electrical noise
High levels of electrical noise can interfere with laser operation and cause it to become unstable. Always connect the
analyzer to a properly grounded power source.
6.4 Contamination
Contamination and long exposure to high humidity are valid reasons for periodically cleaning the gas sampling lines.
Contamination in the gas sampling lines can potentially find its way to the sample cell and deposit on the optics or
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