Edwards PGC201, Instruction Manual

Page: 40 / 68

D0300040001EN - Parameters
Page 30
Figure 13 Behaviour of a switching function in response to pressure changes
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 hysteresis prevents rapid
switching on and off of the switching function when the pressure is close to a switching
threshold.
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.

The instrument is now running the parameter mode in the parameter group

.

Press the pushbutton (PARA) to select the desired parameter.

The name and the value of the parameter are displayed.

Use the arrow pushbuttons to change the threshold value.

The value of the parameter is changed.

Repeat the steps to change further parameters of the parameter group.
Adjustment range
The upper and the lower threshold value can be changed depending on the type of sensor in
the range between 5 x 10
2
and 1 x 10
-8
mbar.
Hysteresis amounts to at least 10% of the lower threshold value.
CAUTION:
Select the threshold values for the CPG in the range from 1 x 10
-8
to 1 x 10
-2
mbar and for
the PRG in the range from 5 x 10
-3
to 5 x 10
2
mbar.
p Pressure
t Time
NO Normally open contact
COM Common contact
NC Normally closed contact