SS2100i-2 TDLAS Gas Analyzer Operating Instructions
Endress+Hauser 17
Fig 10. Components on a 0.1 sample cell panel enclosure
1. Heater 6. Transition plate thermistor
2. High temp. limit thermostat set at 70 °C 7. Measurement cell
3. AC terminal block for heater 8. Pressure sensor
4. Terminal blocks 9. Sample temperature thermistor
5. Fan
In the electronics enclosure, the analyzer power supply provides power to the analyzer control electronics and relays
controlling valves. The analyzer control electronics drive the laser, collect the signal and analyze the spectra.
Powered relays control valves while unpowered relays serve as alarm contacts. An AC line filter is used to condition
the input power.
The auxiliary switch-mode power supply provides power to the heater temperature controller and the RS-232/RS-
485 converter. The power supply is rated for 1.3 A at 24VDC output at ambient temperatures T
a
60 C. The
operational state is indicated by LEDs on the front face, where green means the output voltage is on and within
specification, and red means the output voltage is on but below specification.
The thermostat prevents the temperature inside the enclosure from getting too hot. The thermostat is preset at the
factory to open the power circuit if the temperature inside the analyzer enclosure exceeds 70 4 C. The power
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