MKS HPS 919 Series, Operation And Maintenance Manual

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Hot Cathode Ionization High Vacuum Senor System
AC Power Cord
The Series 919 System includes a standard 120 VAC, 50/60 Hz power cord
with a female IEC-320 connector.
If the available power source or connection is different, use only a detachable
cord set with conductors that have a cross-sectional area equal to or greater
than 0.75 mm
2
. The power cable should be approved by a qualified agency
such as VDE, Semko, or SEV.
Accessory Connector
Relay set point contacts and analog output voltage can be accessed from the
Accessory port on the rear panel of the Controller. A mating connector kit is
included with the Series 919 Hot Cathode System. The chart and figure below
identify the pin functions of the Accessory port.
Do not inadvertently short circuit the set point relay
terminals to the analog output voltage or to other
Controller functions.
Connect the following pins (9, 10, or 13) to a TTL low voltage or to ground to:
Pin 9 – Disable all Controller functions, Sensor voltage, and set point relays.
Pin 10 – Turn on the filament and grid voltage. The front panel Filament
switch must be set to remote.
Use pins 9 or 10 to connect the Controller to a medium pressure sensor, such
as a Pirani, to interlock the Hot Cathode Sensor to it and turn the Hot
Cathode Sensor off and on when appropriate.
Male, 15-pin
Accessory connector
Pin Description
1 set point relay 1 - normally closed contact
2 set point relay 1 - common
3 set point relay 1 - normally open contact
4 set point relay 2 - normally closed contact
5 set point relay 2 - common
6 set point relay 2 - normally open contact
7 not used
8 not used
9 Controller - disable
10 remote filament - enable
11 analog output voltage (+)
12 ground
13 remote degas - enable
14 Low Emission Current monitor
15 not used
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