Wiring diagram:
→
→
example 3, page 26
.
■
■
Combination of two different physical quantities
Temperature-dependent pressure monitoring
• The pressure sensor monitors a permissible maximum pressure and
provides a switched signal when it is exceeded.
• The maximum permissible pressure decreases when the medium
temperature rises: At 0°C it is 100 bar, at 100°C only 90 bar.
• The medium temperature is detected by a temperature sensor
(measuring range 0 ... 200°C; analogue output 4 ... 20 mA). It
transmits its analogue signal to the pressure sensor and is to reduce
the switch point from 100 to 90 bar.
Wiring diagram:
→
→
example 2, page 25
.
34
SP1 = 100
OU1 = Hno
Output 1 is to switch (= ON) when the maximum pressure
exceeds the value of 100 bar.
InP2 = I
The temperature sensor provides a current signal.
ILP2 = 4
For a medium temperature of 0°C the temperature sensor
provides 4 mA.
IHP2 = 12
For a medium temperature of 100°C the temperature sensor
provides 12 mA.
IEP2 = -10
The switch point of the pressure sensor is to be reduced by
10 bar when the medium temperature is 100°C.
SP1[bar]
IEP2 = -10
90
100
4mA
12mA
I
ext
Display: Dmod = P1: system pressure is displayed.
above the line output 1 is switched
