Installation, Operating & Maintenance Instructions
Series 615 DN 40 (I.D. 1½”), DeviceNet
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel +41 81 771 61 61 Fax +41 81 771 48 30 CH@vatvalve.com www.vatvalve.com
3.6.6 ZERO
ZERO allows for the compensation of the sensor offset voltage.
When ZERO is performed the current value at the sensor input is equated to pressure zero. In case of a 2 sensor system
both sensor inputs will be adjusted. A max. offset voltage of +/- 1.4 V can be compensated. The offset value can be read
via local and remote operation.
Local operation:
(‘Control View’, ‘Control Performance Analyzer’ or
‘Service Box 2‘)
Remote operation:
(Refer to chapter «Selection Object» resp. «S-Singel
Stage Controller Object» for details)
Go to menu ‘Zero / ZERO’ and follow instructions.
1. Send EXECUTING
(if not yet selected)
2. Select SETPOINT TYPE
= position control
3. Select CONTROL MODE for position
= open valve
4. Wait until process chamber is evacuated and
sensor signal is not shifting anymore.
Note: Do not perform ZERO as long as pressure gauge voltage is shifting otherwise incorrect pressure reading is the
result. Refer to manual of sensor manufacturer for warm up time.
Note: Do not perform ZERO, if the base pressure of your vacuum system is higher than 1‰ of sensor full scale. We
recommend disabling ZERO function in this case; refer to «Valve and sensor configuration» of the setup procedure.
Otherwise incorrect pressure reading is the result.
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