Operating Instructions PS27
10
7.
Display (Option)
To show up the readings, the PS27 can also be fitted out with a display. The readings
will be shown in either Pa or kPa depending on the limiting value of the measuring
range. The number of the measuring range selected is always shown on the bottom
line of the display.
On switching on a display-equipped appliance, the first thing shown is the PS27
programme version followed by a 1.5 second screening of the limiting value of the
selected measuring range and then the actual readings.
8.
Setting the Relay Operating Point (Option)
The relay operating point can be adjusted with the aid of the potentiometer P2.1 (Set
Relay). Adjustment is easiest when the desired switching pressure is applied and the
potentiometer set so that the relay is just triggered.
Please note: The relay is connected to the sensor's output so that any adjusted
time delay will also cause a delay in relay triggering.
9.
In case of Malfunctions
Fault description
Possible cause
Corrective action
No output signal
• Supply voltage is not
connected
• Incorrect supply voltage
connected
• Defective input protection diode
Only for DC power:
• defective reverse polarity diode
• Connect correct supply
voltage
• Connect correct supply voltage
(see rating plate)
• Send the appliance to the
manufacturer for repairs
• Send the appliance to the
manufacturer for repairs
Output signal is
constant despite
change in pressure
• Defective output protection
diode
• Pressure ports reversed
• Send the appliance to the
manufacturer for repairs
• Connect the pressure as described in
"3. Installation"
Output signal
incorrect
• Faulty pressure sensor
• Zeroing with pressure applied
For current output:
• load too high
For voltage output
• Load resistance too low
• Send the appliance to the
manufacturer for repairs
• Renewed zeroing without pressure
• Note maximum 500
load
• Note minimum 50 k load resistance
(see "7 Specifications")
10.
Specifications
