OPERATION
Series
82/116
Edition 2018-08-20 605262EE
5.5.1 Pressure control operation with 2 sensors
[applicable with 612 . . - . . . F - . . . . version only]
If 2 sensor operation is enabled, changeover between the sensors is done automatically during pressure
control. For configuration refer to chapter «Setup procedure». We recommend a ratio of 10:1 between the
pressure gauges. Max. ratio is 100:1. High range respectively low range pressure gauge may be either
connected to sensor 1 or sensor 2 input.
It’s required to do correct sensor configuration.
Between 90 and 100% of the low range sensor full scale, the low range sensor is phased out while high
range sensor is phased in during pressure rise. During pressure decrease the high range sensor is
phased out while low range sensor is phased in. This maintains a functional response behavior in case of
small calibration errors between the two sensors. The PRESSURE output in this range is a blend
between both sensors.
Make sure that both sensors are calibrated. Do not close optional gauge isolation
valves during the transition phase between the sensors.
Above picture shows a 2 sensor system. In this configuration sensor 2 covers low range (100 mTorr)
and sensor 1 covers high range (1 Torr). RANGE CONFIGURATION for PRESSURE resp. SENSOR
READING is set to 1000’000. Switchover between sensors is done automatically.
sensor
sensor
0 – 1000’000
100 mTorr
0 mTorr
0 – 1000’000
0 – 1000’000
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