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6.
Resistance Reading for CEP Sensor Tube
Looking at the connector end of the gauge tube, you will see a male 9 pin
D connector. (See diagram below). It will have 5 pins in one row and
4 pins in the other row. With the 5-pin row on top, pin #1 is on the left
side of the top row and pin #6 is on the left side of the bottom row.
These measurements must be made while the gauge is at atmospheric pressure;
do not use a method which applies more than 10 mA to the pins or you will damage
the fine internal wires.
For a good tube, the following are the approximate resistances, pin to pin:
Between Pins;
Resistance
Pin 1 to Pin 7
20 ohms
Pin 1 to Pin 8
200 ohms
Pin 5 to Pin 7
48 ohms
Figure 12: MKS/HPS Model 317 CEP
(end view)
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