MAMAC SYSTEMS PR-274 Manual

Model PR-274/275
Low Pressure Transducer
Technical Information
Rev. 0
7400 Flying Cloud Drive • Minneapolis, MN 55344-3720 • USA
800-843-5116 • 952-835-1626 • Fax [phone]
www.mamacsys.com
IS.PR274/275-00
For additional information, see the accompanying data sheet for this transducer.
Ordering Information
Dimensions
Figure 1. Pressure Transducer Dimensions
Specifications
Accuracy*:±1% FS
Overpressure: 10 PSID
Supply Voltage: 12 - 40 VDC;
12 - 35 VAC (VDC output transducers only)
Supply Current: 10 mA maximum for VDC output
transducers; 20 mA maximum for mA output transducers
Enclosure: 18 gage C.R. steel NEMA 4 (IP65) or panel mount
chassis
Finish: Baked-on enamel PMS2GR88B
Compensated Temperature Range: 25°F to 150°F (-4°C to
65°C)
T. C. E r ro r:±0.0125%/°F (.02%/°C)
Operating Temperature Range: 0°F to 175°F (-18°C to 80°C)
Media Compatibility: Clean dry air or any inert gas
Environmental: 10 to 90% RH non-condensing
Termination: Unpluggable screw terminal block
Wire Size: 12 gage maximum
Load Impedance: 1.6K ohms maximum at 40 VDC (mA output
transducers)
1K ohms minimum (VDC output transducers)
Weight: Enclosure mount: 1.0 lb. (.45 kg);
Panel mount: 0.5lbs. (.25 kg)
*Includes nonlinearity and non-repeatability.
Installation
Inspection
Inspect the transducer packaging for signs of damage. If damaged, notify the carrier
immediately.
Requirements
• Tools (not provided):
- Digital volt-ohm meter (DVM)
- Appropriate screwdriver for mounting screws
- Appropriate drill and drill bit for mounting screws
• Appropriate accessories
• Two #8 self-tapping mounting screws (not provided)
• Training: Installer must be a qualified and experienced technician
WARNING!
• Disconnect the power supply before installing the transducer. Failure to do so can result in
electrical shock and equipment damage.
• Make all connections in accordance with the job wiring diagram and national and local
electrical codes. Use only copper conductors.
• Use electrostatic discharge precautions such as wrist straps when installing and wiring the
transducer.
• Avoid installing the transducer in locations where severe shock, vibration, excessive
moisture, or corrosive fumes are present. NEMA 4 housings are primarily intended for
outdoor use to provide a degree of protection against windblown dust, rain, and hose-
directed water.
• Do not exceed ratings for the transducer.
Mounting
1. Remove the transducer cover using a Phillips screwdriver.
2. Select the mounting location.
3. Mount the transducer on a vertical surface with two number eight self-tapping screws (not
provided).
4. Pull the wires through the bottom of the enclosure and make the necessary connections.
5. Replace the cover and make the pneumatic connections.
Wiring
Use 12 AWG wire maximum for wiring terminals. Use flexible 1/4-inch outer diameter (5/32-inch
inner diameter) tubing for the high and low pressure connections. See Figures 6 to 9 for wiring
diagrams and Figures 10 and 11 for jumper designations.
Wiring for mA Output
1. Remove the blue terminal block by carefully pulling it off the circuit board. See Figure 4.
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. Reinsert the terminal block to the circuit board and apply power to the transducer.
7. Check for the appropriate output signal by using a DVM set to DC milliamps connected in
series to the [-] terminal.
Figure 4. Pressure Transducer With mA Output
Wiring for VDC Output
The VDC output low pressure transducer is field selectable for 0 - 5 VDC or 0 - 10 VDC output
and can be powered with either 12 - 40 VDC or 12 - 35 VAC.
1. Remove the blue terminal block by carefully pulling it off the circuit board. See Figure 5.
2. Locate the [+], [-], and [0] terminal markings on the board.
3. Attach the power wires to the [+] and [-] terminals. The [-] terminal is also the negative
output terminal.
4. Connect the [0] terminal, which is the positive VDC output terminal, to the controller’s
input.
5. Reinsert the terminal block to the circuit board and apply power to the transducer.
6. Check the appropriate VDC output by using a DVM set to DC volts connected to the [0]
and [-] terminals.
CAUTION!
• If using grounded AC, ensure that the hot wire is on the [+] terminal. In addition, if using a
controller without built-in isolation, use an isolation transformer to supply the transducer.
• This transducer contains a half-wave rectifier power supply and must not be powered from
transformers powering other devices with non-isolated full-wave rectifier power supplies.
• When multiple transducers are powered from the same transformer, damage will result
unless all 24-gage power leads are connected to the same power lead on all transducers.
Maintain the correct phasing when powering more than one transducer from a single
transformer.
Figure 5. Pressure Transducer With VDC Output
PACKAGING RANGE OUTPUT
274 (enclosure mount)
275 (panel mount)
R1 (“ wc)
R2 (“ wc)
R3 (“ wc)
R4 (“ wc)
R5 (pa)
R6 (pa)
R7 (pa)
R8 (pa)
0 to 0.10 / -0.05 to 0.05
0 to 1.0 / 0 to 0.5 / 0 to 0.25 /
-0.5 to 0.5 / -0.25 to 0.25 /
-0.125 to 0.125
0 to 5.0 / 0 to 2.5 / 0 to 1.25 /
-2.5 to 2.5 / -1.25 to 1.25 /
-0.625 to 0.625
0 to 30 / 0 to 15 / 0 to 7.5/
-15.0 to 15.0 / -7.5 to 7.5 /
-3.75 to 3.75
0 to 25 / -12.5 to 12.5
0 to 250 / 0 to 125 / 0 to 62.5 /
-125 to 125 / -62.5 to 62.5 /
-31.25 to 31.25
0 to 1250 / 0 to 625 /
0 to 312.5 / -625 to 625 /
-312.5 to 312.5 / -156.25 to
156.25
0 to 7500 / 0 to 3750 /
0 to 1875 / -3750 to 3750 /
-1875 to 1875 / -937.5 to 937.5
mA
VDC
4 - 20 mA two-wire
0 - 5 or 0 - 10 VDC
(field selectable)
Figure 2. Enclosure Mount
Transducer
Figure 3. Panel Mount
Transducer

Page 2 of 2
IS.PR274/275-00
Typical Applications (wiring diagrams)
Figures 6 and 7 illustrate typical wiring diagrams for the mA output low pressure transducer.
Figure 6. Wiring mA Output Transducers With an External
DC Power Supply
Figure 7. Wiring mA Output Transducers Where the Controller or Meter Has
an Internal DC Power Supply
Figures 8 and 9 illustrate typical wiring diagrams for the VDC output low pressure transducer.
Figure 8. Wiring VDC Output Transducers With an External AC
Power Supply
Figure 9. Wiring VDC Output Transducers With an
External DC Power Supply
Adjustments
Jumper Configuration
Jumper configuration varies according to the output type of the low pressure transducer. Range
configurations are shown in Table 1. Jumper selections for mA output low pressure transducers
are shown in Figure 10; jumper selections for VDC output low pressure transducers are shown
in Figure 11.
Figure 10. Jumper Selections for Pressure Transducers
With mA Output
Figure 11. Jumper Selections for Pressure Transducers With
VDC Output
Checkout
1. Verify that the transducer is mounted in the correct position.
2. Verify the appropriate input signal and supply voltage.
3. Verify the appropriate configuration range.
CAUTION!
• Never connect 120 VAC to the pressure transducer. AC voltage should never be connected
to a transducer intended for a DC power supply.
Transducer Operation
1. Adjust the pressure to obtain the maximum output signal for the appropriate range.
2. Ensure that output is either 20 mA or 5 or 10 VDC.
3. Adjust the pressure to obtain a minimum output signal.
4. Ensure that output is either 4 mA or 0 VDC.
Note:
This pressure transducer is a highly accurate device. For applications requiring a high degree of
accuracy, use laboratory quality meters and gages.
Calibration
All transducers are factory calibrated to meet or exceed published specifications. If field
adjustment is necessary, follow these instructions:
Calibration of All Pressure Transducers
1. Connect terminals [+] and [-] to the appropriate power source.
2. Connect the DVM in series to the [-] terminal.
3. Apply low pressure to the transducer and carefully adjust the zero trimmer [Z] to obtain the
desired low output pressure.
4. Apply high pressure to the transducer and adjust the span trimmer [S] to obtain the desired
high output pressure.
5. Repeat steps 3 and 4 until the transducer is fully calibrated.
Calibration of VDC Output Pressure Transducers Only
1. Connect terminals [+] and [-] to the appropriate power source. The [-] terminal is also the
negative output terminal.
2. Connect the DVM on DC volts across the [0] and [-] terminals.
3. Apply low pressure to the transducer and carefully adjust the zero trimmer [Z] to obtain the
desired low output pressure.
4. Apply high pressure to the transducer and adjust the span trimmer [S] to obtain the desired
high output pressure.
5. Repeat steps 3 and 4 until the transducer is fully calibrated.
Maintenance
Perform regular maintenance on the total system to ensure the sustained optimum performance
of the low pressure transducer.
Field Repair
Do not attempt to repair the low pressure transducer. Replace a malfunctioning transducer with
a functional transducer if necessary.
Warranty
See the accompanying data sheet for additional information.
Copyright ©Mamac Systems 2003. All rights reserved.
Mamac Systems reserves the right to change any specifications without notice to improve the
performance, reliability, or function of our products.
Table 1. Jumper Range Configurations
Range A B C D F E G H
R1 0 to.10 -.05
to.05
——— — — —
R2 ——0to
1.0
0 to.5 0 to.25 -.05
to.05
-.25
to.25
-.125
to.125
R3 ——0to
5.0
0 to
2.5
0 to
1.25
-2.5 to
2.5
-1.25 to
1.25
-.625
to.625
R4 — — 0 to 30 0 to 15 0 to
7.5
-15.0 to
15.0
-7.5 to
7.5
-3.75 to
3.75
R5 0 to 25 -12.5
to 12.5
——— — — —
R6 ——0to
250
0 to
125
0 to
62.5
-125 to
125
-62.5 to
62.5
-31.25 to
31.25
R7 ——0to
1250
0 to
625
0 to
312.5
-625 to
625
-312.5
to 312.5
-156.25
to 156.25
R8 ——0to
7500
0 to
3750
0 to
1875
-3750 to
3750
-1875 to
1875
-937.5 to
937.5