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Temperature
Controller
Heated Sample
Thermo Fisher Scientific
Figure 7–2. Sample Probe
The probe is designed so that changing the filter element does not involve
the use of tools. In this operation neither the sample probe tube nor sample
line need to be removed, thus avoiding contamination of the clean gas path
and maintaining the integrity of the system.
The system includes a temperature control module which is used to control
the temperatures of the following system components:
FTIR cell
●
Heated pump/valve assembly
●
Heated sample lines
●
In addition, the FTIR cell pressure is measured with this controller.
A USB connection is included to report the system temperatures and
pressure to the PC.
The heated sample line may be from 33 feet to 100 feet in length,
depending on manufacturer. It includes two 1/4-inch lines for sample and
Line
calibration and one 3/8-inch line for blowback. The lines may be PTFE or
PFA, depending on manufacturer. All lines are heated to 185 °C, and the
maximum current necessary to heat these lines is 15 Amps at 220-240VAC
50/60 Hz. The sample line temperature is monitored using a 2-wire 100
ohm RTD. Additional electrical lines are included to hook up the probe
temperature alarm and blowback valve.
System Component Description
Temperature Controller
Omni FTIR Multi Gas CEMS Instruction Manual
7-3
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