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Operation
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6.
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Menu item: „Calibrate“
Calibration:
When
search
lower point (Pmin)
is activated, evacuation is to the lower point. If the pres-
sure does not fall any further, the value can be entered by using a comparison measurement
device and confirmed with
Ok
. The system is vented and the ambient barometric pressure
entered as the
upper point (Pmax)
. Do not confirm until the value has been established.
If the controller is integrated in a complete system or pump system (LVS), evacuation and
venting take place automatically when the stated buttons are pressed.
The calculated correction values are displayed and can be stored with
save
.
CAUTION !
Ensure that the set pressure is also present at the sensor.
Designation
Explanation
Software
WELCH-Control 521
Control panel
at the controller
Lower point
CL
at low pressure -
pressure of comparison measurement device
(at lowest possible pressure, e.g. 10 mbar)
Upper point
CH
at normal pressure (high) -
barometric pressure