Operating Instructions PS27
8
3.3 Connections for Two-Wire System (Option):
One measurement range
Four measurement ranges
ST4 Pin
Connection name
Meaning
1
24V
+terminal 15-32VDC
2
GND
Not used
3
OUT
-terminal
4
GND
Not used
5
SET 0
Zero-point input
4.
Resetting Offset
After starting the pressure transducer, give it some 15 minutes to warm
up. During this time the output signal may be unstable.
Zero-point calibration of the appliance is only effected via the input assigned
for this purpose.
The user must ensure that the appliance is not subjected to any
pressure during the calibration process as this might lead to a wrong offset
value which, in turn, would result in a wrong output signal.
The 24V input makes
it possible to activate a 3/2 directional control valve with the same signal, which
switches the PS27's pressure inputs at zero pressure during the zero calibration
process. In this case the zero point calibration signal must be applied until there is no
doubt that the pressure has fallen to zero.
While Resetting Offset is in progress, the power supply must not be
switched off. This might result in a loss of the device setting and may
leave the PS27 unusable.
5 4 3 2 1
5 4 3 2 1
