INSTALLATION Series
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Edition 2017-11-24 742280ED
4.6.6 ZERO
This function is available on the (Master valve only).
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 «RS232 control commands»
resp. «RS232 setup commands» for details)
Go to menu ‘Zero / ZERO’ and follow
instructions.
1. Send OPEN VALVE
2. Wait until process chamber is evacuated and
sensor signal is not shifting anymore.
3. Send ZERO
• 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.
• 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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