BG 800 300 BE / A (0105) TPG 300
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4.7.4 »Switching functions« group
a) »Switching function selection« function
Switching functions 1 to 4 affect the relays of an interface
plug-in board (accessory). A and B can control the on/off
switching of the cold cathode gauge heads.
1 2 3 4 A B
mbar
0
10
Switching
function
Affects
1
2
3
4
A
B
Interface plug-in board relay 1
Interface plug-in board relay 2
Interface plug-in board relay 3
Interface plug-in board relay 4
Cold cathode measuring circuit(s) in slot A
Cold cathode measuring circuit(s) in slot B
b) »Threshold selection« function
Defining an upper and a lower threshold defines a hysteresis
for each switching function.
1 2 3 4 A B
mbar
0
10
When the pressure is dropping, the status changes to »on« at
the lower threshold and to »off« at the upper threshold.
OFF
ON
Status of switching function
lower
upper
threshold value
Pressure p
Hysteresis
∆
p is a minimum of 10% of the lower
threshold. This prevents unstable states.
If you set the upper threshold too low, the minimum hysteresis
will go into effect automatically.
