Filter
Top Products
Model 9110T NOx Analyzer Principles of Operation
Teledyne Analytical Instruments 351
Input Gain Selector 1 – 11
Type K Compensation 4 – 14
Output Scale Selector 2 – 12
Termination Selector 5 – 15
TC2
Not Used
TC1
Type J Compensation 3 – 13
Purple Jumpers
Figure 13-19: Thermocouple Configuration Jumper (JP5) Pin-Outs
13.4. SENSOR MODULE, REACTION CELL
The 9110T sensor assembly consists of several subassemblies, each with different tasks:
The Photo Multiplier Tube (PMT) detects the intensity of the light from the chemiluminescence
reaction between NO and O
3
in the reaction cell. It outputs a current signal that varies in relationship
with the amount of light in the reaction cell.
The PMT Preamplifier PCA converts the current output by the PMT into a voltage and amplifies it to
a signal strong enough to be usable by the motherboard’s A D converter.
It also supplies the drive voltage and gain adjustment for the PMT’s High Voltage Power Supply
(HVPS)
The Thermo-Electric Cooler (TEC) controls the temperature of the PMT to ensure the accuracy and
stability of the measurements.