Inficon PCG550 - Page 41

tina56e1-f (2015-09) 41
The current threshold setting
• can be read / written via the diagnostic port
• is output at the measurement signal output instead of the
pressure signal, can be measured with a voltmeter, and is
displayed on the LCD display after the <SP1> or <SP2>
button is pressed
• can be read / written via the DeviceNet, Profibus, EtherCAT
and RS485 interface.
Switching characteristics and hysteresis
The switching characteristics and the hysteresis of each set
point can be programmed (→  44).
Low Trip Point (default)
If the pressure in the vacuum system is lower than the setpoint,
the corresponding LED (<SP1> or <SP2>) is lit solid and the
corresponding relay is closed.
Time t
M
e
a
s
u
r
e
m
e
n
t
v
a
l
u
e
OffOn
Hysteresis
(10% of threshold)
Off
Setpoint
Measurement signal
(Pressure p)
Threshold value
The setpoints SP1 and SP2 are factory set to the lower
measurement range limit and therefore do not switch.