Download Druck DPI 145 Multi-Function Pressure Indicator User Manual K147

3: Installation
3-13
To connect an external transducer, plug the connector into the appropriate socket.
Resonant sensors should be plugged into the socket labelled EXT RPT and
Piezo Resistive sensors into the socket labelled EXT PDCR.
NOTE: The external transducer input sockets, although of the same pattern, are
electrically different i.e. a Piezo Resistive device will not operate if
plugged into the Resonant Sensor socket and similarly, vice versa.
Secure the connector into the socket by tightening the connector securing
screws.
For information on the use of external transducers with the equipment, refer to
Section 4.6.1. Section 5, Calibration, gives details of the calibration procedures for
external transducers. When a conventional PRT (not Digitally Characterised) is
connected to the instrument for the first time, the pressure reading will be shown
on the display in units of voltage not pressure. This is because the zero and full
scale offsets of the transducer must be corrected by compensation before
voltage can be interpolated as pressure. Refer to Section 5 for compensation
details.
3.7
Switch Test and Analogue (I/V) Output
Connections to the Switch Test and the I/V Output sockets are made via
coaxial BNC connectors. To connect to either of these sockets, plug a lead fitted
with a BNC connector into the socket.
The Pin-out of both sockets is shown in Fig. 3.9.
I/V Output
Shell
Centre
Switch
(-ve)
(+ve)
Shell
Centre
Switch -ve
Switch +ve
+5V
200
Voltage
or
Current
Source
+
GND
EXT
Load
Current or Voltage Output
+ve
+
External
Switch
GND
-ve
Switch Test Input
Figure 3.9 - Switch Test and I/V Output Socket Connections
K147 Issue No. 4
3