1-8 | Model 900 ADA / Model 930 Sulfur Pit Analyzers
Temperature Control System
Sample and Vent Lines
To ensure the temperature of these lines do not fall below the dewpoint of
the sample gas, the lines are controlled at a Set Point of 150 °C.
ASR900 Sample Probe
The temperature of the ASR900 Sample Probe is maintained at 130 °C by a
control loop utilizing a temperature sensor (PT100 RTD) and a flameproof
heater. The heater is protected from overheating by a temperature switch,
which will disconnect power if the heater exceeds approximately 170 °C.
Measuring Cell
The Measuring Cell temperature is controlled to create a stable condition
for the analysis of the sample gas to take place and to ensure that no con-
densation forms which can obscure the light path of the analyzer. Control
is accomplished using a RTD embedded in the Heater Plate. The RTD
makes contact with the Measuring Cell mount.
The default and recommended temperature Set Point for the Measuring
Cell is set at 150 °C but can be modified through the keypad.
If Sv is the only condensable in the sample stream, the nominal Set Point
(150 °C) should be adequate to prevent condensation. If there is indication
of the accumulation of Ammonia salt on the Measuring Cell Windows
(e.g., NDR reading increases steadily and does not dissipate during pro-
longed Zeroing of the analyzer), increase the Measuring Cell Set Point to
155 °C.
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