Thermocouple Sensor; General; Connecting The Dv-6M Sensor - MKS HPS 937A Series Owner's Operation And Maintenance Manual

Thermocouple Sensor

Teledyne-Hastings DV-6M

General

Thermocouple sensors, like Pirani sensors, measure vacuum through thermal
conductivity. A thermocouple is used to measure temperature of a heated
wire. The temperature of the wire is directly related to the gas pressure.
Thermocouple sensors measure pressure from 1.0 x 10
low in cost, but are limited in range and accuracy.
Orienting the DV-6M Sensor
If installed in an area where condensable vapors are present, mount with the
open end face down to allow drainage.

Connecting the DV-6M Sensor

A thermocouple sensor is available with a
fitting . To install the Sensor with a
tightening. The Sensor's vacuum tubing has
Wrap about two turns of Teflon
direction of the threading to ensure a leak-free seal.
Do not use a compression mount (quick connect) to attach the
Sensor to a system in positive pressure applications.
Positive pressures might blow the Sensor out of a compression fitting,
damaging equipment and possibly injuring personnel.
A solid electrical connection between the Sensor and the
grounded vacuum system must be provided to shield the tube
element from external radiation sources.
The thermocouple sensor module has two female, 9-pin "D" connectors. A
thermocouple sensor is connected to the module with a multiconductor
shielded cable.
At the sensor, the cable has a female, 8-pin octal connector. Cables may be
fabricated using the information shown here (maximum length 25 ft).
A.18
1
/ " NPT-M or 0.410 compression
8
1 / " NPT, do not use the case for
8
9 / " hex flats for tightening.
16
® tape on the threads of the Sensor in the
937A Multi-Sensor System
-3
to 1 Torr. They are