Inficon BPG400 - Switching Functions Configuration; Setting the Switching Functions

38 tina03e1 (0206) BPG400 v1.om
The gauges BPG400-SD and BPG400-SP have two independent, manually
settable switching functions. Each switching function has a floating normally open
relay contact. The relay contacts are accessible at the sensor cable connector
(
® 2 23).
The threshold values of switching functions A and B can be set within the pressure
range 1×10
-9
mbar … 100 mbar via potentiometers "SETPOINT A" and
"SETPOINT B".
The Formula applied to calculate the corresponding threshold voltage
U
Threshold
depends on the gauge version used (BPG400-SD or
BPG400-SP).
For BPG400-SD: U
Threshold
= 0.75 × (log p
Setpoint
– c) + 7.75
For BPG400-SP: U
Threshold
= 0.8129401 × (log p
Setpoint
– c + 9.30102999)
Constant c is pressure unit dependent (® Appendix A).
Time t
Off
Off
On
Hysteresis
10% U
Threshold
Switching function
Threshold
U
Measuring Signal
(Pressure p)
(Setpoint A, B)
M
e
s
s
u
r
e
d
v
a
l
u
e
The hysteresis of the switching functions is 10% of the threshold setting.
The threshold values of the two switching functions "SETPOINT A" and
"SETPOINT B" are set locally on the potentiometers of the gauge that are acces-
sible via the openings on one side of the gauge housing.
· Voltmeter
· Ohmmeter or continuity checker
· Screwdriver, max. ø2.5 mm
4.9 Switching Functions
(BPG400-SD,
BPG400-SP)
4.9.1 Setting the Switching
Functions
Required tools