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M102E/M501 TRS THEORY OF OPERATION
(Addendum to M101E Manual - P/N 04740 Rev A)
9.4. Electronic Operation
9.4.1. Sensor Module
This Section replaces Section 10.4.2 of the M101E Manual - P/N 04740 Rev A.
Electronically, the M102E sensor module is a group of components that: create the UV light that
initiates the fluorescence reaction between SO
2
and O
3
; sense the intensity of that fluorescence
and generate various
electronic signals needed by the analyzer to determine the SO
2
concentration of the sample gas (see Section 9.1) and sense and control key environmental
conditions such as the temperature of the sample gas and the PMT.
PMT HOUSING
Reaction Cell
Sample Gas Outlet
Sample Gas Inlet
PMT Preamp PCA
Lamp Shutter Housing
UV Lamp
Reference Detector
SAMPLE CHAMBER
PMT Cooling System
Figure 9-2: M102E Sensor Module
These components are divided into two significant subassemblies. The sample chamber and the
PMT assembly.
• Figure 9-3 shows an exploded view of the sample chamber assembly
• Figure 9-5 shows an exploded view of the PMT Assembly
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