MAMAC Systems PR-275 - Manual (Page 2)

Model PR-274/275
Technical Information
TI.274/275-06
LOW PRESSURE SENSOR
Page 2 of 4
PR-274/275 Low Pressure Transducer with mA Output
TYPICAL APPLICATIONS (wiring diagrams)
PR-274/275 pressure transducers with VDC output are field selectable 0-5 VDC
or 0-10 VDC output and can be powered with either a 12-40 VDC or 12-35 VAC.
The following describes the proper wiring of these pressure transducers with
VDC output:
Wiring PR-274/275 Units with VDC Output
1. Remove the terminal block by carefully pulling it off the circuit board.
2. Locate the [+], [-] and [O] terminal markings on the board.
3. Attach the power wires to the [+] and [-] terminals. The [-] terminal is also the
negative terminal.
4. Connect the [O] terminal, which is the positive VDC output terminal, to the
controller’s input terminal.
5. Re-insert the terminal block to the circuit board and apply power to the unit.
6. Check the appropriate VDC output using a voltmeter set on DC volts across
the [O] and [-] terminals.
PR-274/275 pressure transducers with 4-20 mA output are powered with a
12-40 VDC supply.
The following describes the proper wiring of these pressure transducers with
mA output:
Wiring PR-274/275 Units with mA Output
1. Remove the terminal block by carefully pulling it off the circuit board.
2. Locate the [+] and [-] terminal markings on the board.
3. Attach the supply voltage to the [+] lead.
4. Connect the 4-20 mA output ([-] terminal) to the controller’s input terminal.
5. Ensure that the power supply common is attached to the common bus of the
controller.
6. Re-insert the terminal block to the circuit board and apply power to the unit.
7. Check for the appropriate output signal using a DVM set on DC milliamps
connected in series with the [-] terminal.
PR-274/275 Low Pressure Transducer with VDC Output
TYPICAL APPLICATIONS (wiring diagrams)
Input Signal
+
Common
+ +
Shield/Ground
Controller / Meter / Recorder
mA Output Transducer Only 12-40 VDC Power Supply
Input Signal
+
Common
+
Shield/Ground
Controller / Meter / Recorder mA Output Transducer Only
Figure 1 and Figure 2 illustrate typical wiring diagrams for the mA output low
pressure transducer.
Figure 1 - Wiring for mA Low Pressure Transducers with an External DC Power
Supply
Figure 2 - Wiring for mA Output Transducers where the Controller or Meter has an
Internal DC Power Supply
Figure 3 and Figure 4 illustrate typical wiring diagrams for the VDC output low
pressure transducer.
Signal
+
Common
Supply
Neutral
Hot
O
Input Signal +
Common
+
Shield/Ground
Controller / Meter / Recorder
VDC Output Transducer Only 12-35 VAC Transformer
Figure 3 - Wiring for VDC Low Pressure Transducers When Applied with External
AC Supply
Figure 4 - Wiring for VDC Low Pressure Transducers When Applied with External
DC Power Supply
Signal
+
Common
Supply
O
Input Signal
+
Common
+
Shield/Ground
Controller / Meter / Recorder
VDC Output Transducer Only 12-40 VDC Power Supply
S1
S2
Zu
Zb
S
+
0
S3
ON
ON
ON
MAMA
C
9280
High
Low
MAMAC
9280
MAMA
C
9280
MAMAC
9280
S1
S2
ON
ON
Zu
Zb
S
S1
S2
Zu
S
+
0
S3
ON
ON
Zb
ON
S1
S2
ON
ON
Zu
Zb
S
Caution: If you are using grounded AC, the hot wire must be on the [+] terminal. Also, if you are using a controller without built-in isolation, use an isolation transformer to supply the PR-274/275.
Caution: This product contains a half-wave rectifier power supply and must not be powered off transformers used to power other devices utilizing non-isolated full-wave rectifier power supplies.
Caution: When multiple PR-274/275 units are powered from the same transformer, damage will result unless all 24G power leads are connected to the same power lead on all devices. It is
mandatory that correct phasing be maintained when powering more than one device from a single transducer.
High
Low
Zb
Zu
S
Zb
Zu
S
Zu
S
Zu
S
Zb
Zb
RoHS
High
Low
High
Low