Inficon BPG402-SE - Switching Functions

tina46e1-b (2017-12) BPG402.om 39
The BPG402-S, SL have one, the gauges BPG402-SD, BPG402-SE and
BPG402-SP have two independent, manually adjustable switching functions. Each
switching function has a floating, normally open relay contact. The relay contacts
are accessible at the sensor cable connector (→  19, 20).
The threshold values of the switching functions can be set within the pressure
range 1×10
-9
mbar … 100 mbar via potentiometers "SETPOINT" (BPG402-S, SL)
or "SETPOINT A" and "SETPOINT B" (BPG402-SD, -SE, -SP).
The following rule applies:
U
Threshold
= 0.75 × (log p
Set
p
oint
– c) + 7.75
Where constant c is pressure unit dependent (→ Appendix A).
M
e
a
s
u
r
e
d
v
a
l
u
e
Off
On
Switching function
Measuring Signal
(Pressure p)
(Setpoint A, B)
Time t
Off
U
Threshold
Hysteresis
10% U
Threshold
The hysteresis of the switching functions is 10% of the threshold setting.
4.13 Switching Functions