INFICON Stripe CDG045Dhs 0.01 ... 1000Torr / mbar, new 10mTorr - Manual (Page 33)

tina84e1 (2014-07) 33
4.5 ATM Setpoint
The setpoints SP1 and SP2 of gauges with separate atmos-
pheric pressure sensor
8)
can be programmed to atmospheric
pressure setpoint (ATM setpoint) via the diagnostic port or the
EtherCAT interface.
The ATM setpoint is defined as a factor of the current atmos-
pheric pressure. The relay switches when the pressure in the
vacuum system has reached the defined value (differential
pressure in relation to the atmospheric pressure).
Example: ATM setpoint: 110% of the atmospheric pressure
(= factor 1.1)
Switching characteristic: High Trip Point
Hysteresis: 10 mbar
Measurement signal
(pressure p)
1078 mbar
980 mbar
Atmospheric pres/
sure (ambience)
ATM setpoint 110%
(= factor 1.1)
Hysteresis (1% F.S.)
Off On Off
Threshold value
Reset value
8 )
The atmospheric pressure sensor measures the atmospheric pressure
(pressure outside the vacuum system and can be calibrated against the
diaphragm capacitive sensor in the gauge (
→  Fehler! Textmarke
nicht definiert. ).