Teledyne 9110AH - Nitrogen oxides analyzer - Manual (Page 175)

TELEDYNE Model 9110AH NO
X
Analyzer Operator Manual, 01620, Rev. F
9-59
9.3.8.4 PMT Cooler
The PMT cooler uses a Peltier cooler supplied with DC current from the switching power
supply in the Power Supply Module. An overall view is shown in Figure 9-11. The temperature
is controlled by a proportional temperature controller located on the Preamp board. The input
voltage from the supply is 15 VDC. Typical current through the cooler at room temp is about
1.5 to 2 A. At normal room temperatures the 7 C set point should be maintained within 0.1 C.
The current and voltage can be measured at test points on the fan shroud at one end of the NO
x
sensor module. See the Schematic in the Appendix.