Configuring The Switching Functions; Adjustment Range - LEYBOLD COMBIVAC CM 51 Instruction Manual

The range between the lower and the upper threshold value produces a certain amount of
hysteresis between switching on and switching off of the relay. The hysterisis prevents rapid
switching on and off of the switching function when the pressure is close to a switching
threshold.
7.1.2

Configuring the Switching Functions

 Select the desired measurement channel by operating the pushbutton CH several
times.
 Keep the pushbutton PARA depressed for approximately 2 seconds.
o The instrument is now running the parameter mode in the parameter group SP.
 Press the pushbutton PARA to select the desired parameter.
o The name and the value of the parameter are displayed.
 Use the arrow pushbuttons so as to change the threshold value.
o The value of the parameter is changed.
 Repeat the steps to change further parameters of the parameter group.
7.1.3

Adjustment Range

The upper and the lower threshold value can be changed depending on the type of sensor
in the range between 510
Hysteresis amounts to at least 10% of the lower threshold value.
CAUTION:
Select the threshold values for the PENNINGVAC in the range from 1·10
-2
1·10
34
2 -8
und 110
mbar and for the THERMOVAC in the range from 5·10
Figure 19 – Behaviour of a switching function in
p Pressure
t Time
NO Normally open contact
COM Common contact
NC Normally closed contact
mbar.
response to pressure changes
-3
to 5·10
GA130001441_002_C0 – 09/2016
-8
to
2
mbar.