Teledyne 9110T instruction manual Sensor MODULE, Reaction Cell, TC2, Not Used, TC1

Model 9110T NOx Analyzer Principles of Operation

TC2

Not Used

TC1

Purple Jumpers

Termination Selector 5 – 15 Type K Compensation 4 – 14 Type J Compensation 3 – 13 Output Scale Selector 2 – 12 Input Gain Selector 1 – 11

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 O3 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.

Teledyne Analytical Instruments 351