Operating Instructions PT-LE
9
7.
Display (Option)
To show up the readings, the PT-LE 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 PT-LE
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 P2.1 potentiometer.
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 descritpion
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 tot he manufacturer
for repairs
- Renewed zeroing without pressure
- Note maximum
ȍ
load
- Note minimum 50 k load resistance
ȍ
(see „7 Specifications“)
