INFICON SQM-160 Thin Film Deposition Monitor - Manual (Page 40)

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SQM-160 Operating Manual
3.11 Shutter Operation
The SQM-160 Shutter switch controls a relay that is normally connected to the
source shutter.
To open or close the Shutter relay, press the Shutter switch in the front panel
Control section.
The Open and Closed LEDs illuminate to indicate the shutter status.
NOTE: If Relay 2 is set to Sensor 2 in System Menu, the operation of the Shutter
switch/relay changes slightly. In this case, the shutter relay will activate
only if Sensor 1 is assigned to the active film. If sensor 2 is assigned to the
active film, Relay 2 will close instead.
3.12 Dual Sensors
Dual shuttered sensors provide a backup (secondary) sensor in case of primary
sensor failure. When Relay 2 is programmed for Dual sensors in the System menu,
the SQM-160 will automatically switch to Sensor 2 when Sensor 1 readings stop or
become erratic.
To program the SQM-160 for dual sensors:
1 Press Program to enter Program mode.
2 Press Prev to enter the System Menu.
3 Press Next until RELAY 2 is shown.
4 Turn the Control Knob right to select DUAL sensor function.
5 Press the Control Knob to accept the value.
6 Press Program to exit the System Menu and return to normal mode.
7 In the film menu, assign only Sensor 1 to the film. The backup sensor 2 is
automatically assigned internally.
NOTE: Relay 2 is a multi-function relay. It can be programmed as a dual sensor
shutter, or to close when a programmed time has elapsed, or as a sensor
2 shutter relay.
section 3.20, I/O Connections, on page 3-16 discuss the
other Relay 2 functions.