Preparing The Sensor For Bakeout; Series 421 Cold Cathode Sensor; Connecting The Series 421 Sensor; Disassembling The Series 421 Sensor - MKS HPS 937A Series Owner's Operation And Maintenance Manual

The I-MAG Sensor is ready for installation. If it is not immediately installed,
cover the flange with clean, vacuum grade aluminum foil and cap with a
flange protector.

Preparing the Sensor for Bakeout

To prepare the sensor for bakeout up to 400°C, remove the sensor cable and
magnet assembly as described in "Disassembling the I-MAG sensor".

Series 421 Cold Cathode Sensor

Connecting the Series 421 Sensor

The Series 421 Cold Cathode Sensor and Series 937A Controller are
connected to one another using coaxial cables with SHV and SMA
connectors as shown below.
Ion Current Lead
Series 421 Cold Cathode Sensor cable
Connect the SHV and SMA connectors to their respective connectors on
the rear panel of the Controller – H.V. (SHV connector) and Ion Current
(SMA connector).
Where stress might be applied to the cable, use separate strain relief to avoid
damage to the sensor, cable, or the Controller. Cables are available from the
factory in standard lengths of 10, 25, 50, and 100 feet and in custom lengths
up to 300 ft.
Some applications may require the use of special cables, such as when the
connection must be routed through restrictive barriers or through a conduit.
Custom cables may be fabricated for these situations. Use SHV and SMA
connectors for all applications.

Disassembling the Series 421 Sensor

For the following section, please refer to the figure shown
on page A.7.
The Sensor breaks down into three subassemblies – the backshell, the
internal, and the body subassemblies. Only the internal and body
subassemblies are exposed to vacuum.
A.6
High Voltage Lead
937A Multi-Sensor System