Inside the Type 146 Unit
Chapter Three: Overview
54
Cold Cathode
Located on the end of the Cold Cathode board are two coaxial connectors. Table 12 shows the
connector pinout. A list of MKS sensors, along with their cables, is shown in Table 13.
Cold Cathode Connector Pinout
High Voltage
High Voltage BNC
High Voltage
Center
Chassis Ground
Shield
Ion Current SMA
Ion Current
Center
Chassis Ground
Shield
Table 12: Cold Cathode Connector Pinout
Cold Cathode Sensors And Cables
Sensor and Cable Type
Part Number
Cold Cathode with NW-40-KF
104210001
Cold Cathode with 2¾” CF
104210002
Cold Cathode with 1” tube
104210003
Cold Cathode with NW-25-KF
104210004
Cold Cathode Cable (10 ft.)
100006171
Table 13: Cold Cathode Sensors and Cables
Note
One characteristic common to all ion gauges is an inability to establish an
ion current at high pressures. The gauge may, therefore, respond as if the
pressure is extremely low. Keep this characteristic in mind when setting
a disconnect threshold, alarm trip points, or if you designate an ion gauge
as a reference channel.
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