Installation, Operating & Maintenance Instructions
Series 612 DN 63-250 (I.D. 2.5“ - 10”), RS485
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel +41 81 771 61 61 Fax +41 81 771 48 30 [email protected] www.vatvalve.com
289857EA
2011-07-13
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3.10.1 Operation with 2 sensors
[applicable for 612 . . - . . . K - . . . . 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. It is required that the high range pressure gauge is connected to sensor 1 input and the low range pressure
gauge to the sensor 2 input.
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. 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.
For monitoring purpose each sensor signal may be read out individually.
Note: Make sure that both sensors are calibrated.
Note: Do not close optional gauge isolation valves during the transition phase between the sensors.
