Page 1
8189 Century Boulevard • Minneapolis, MN 55317-8002 • USA
800-843-5116 • 952-556-4900 • Fax 952-556-4997
[email protected] • www.mamacsys.com
For Additional Information See PR-276 Data Sheet
SPECIFICATIONS
Accuracy*: ± 1% FS
Overpressure: 10 PSID
Supply Voltage: 12–40 VDC
12–35 VAC (VDC output units only)
Supply Current: VDC Units – 10 mA max.
mA Units – 20 mA max.
Enclosure: 18 Ga C. R. Steel NEMA 4 (IP-65)
6061T aluminum probe
Finish: Baked on enamel – PMS2GR88B
EMC Conformance: EN 55022, 55024, 61000-3-3,
61000-4-2, 3, 4, 5, 6 & 11
Compensated Temp Range: 25°F to 150°F (-4°C to 65°C)
T. C. Error: ±0.0125%/°F (.02%/°C)
Operating Temp Range: 0°F to 175°F (-18°C to 80°C)
Media Compatibility: Clean dry air or any inert gas
Environmental: 10–90%RH Non-Condensing
Termination: Unpluggable screw terminal block
Wire Size: 12 Ga max.
Load Impedance: 3K ohms max. at 40 VDC (mA
output units)
1K ohms min. (VDC output units)
Weight: Enclosure 1.0 lbs. (.45 kg)
*Includes non-linearity, hysteresis and non-repeatability
ORDERING INFORMATION
RoHS
INSTALLATION
Inspection
Requirements
Inspect the package for damage. If damaged, notify the
appropriate carrier immediately. If undamaged, open the
package and inspect the device for obvious damage.
Return damaged products.
• Tools (not provided)
• Appropriate accessories
• Two #8 self-tapping mounting screws (not provided)
• Training: Installer must be a qualified, experienced technician
Warning:
• Do not use on oxygen service, in an explosive/hazardous
environment, or with flammable/combustible media.
• Disconnect power supply before installation to prevent
electrical shock and equipment damage.
• Make all connections in accordance with the job wiring
diagram and in accordance with national and local
electrical codes. Use copper conductors only.
Caution:
• Use electrostatic discharge precautions (e.g., use of wrist
straps) during installation and wiring to prevent equipment
damage.
• Avoid locations where severe shock or vibration, excessive
moisture or corrosive fumes are present. NEMA Type 4
housings are intended for outdoor use primarily to provide
a degree of protection against wind-blown dust, rain, and
hose-directed water.
• Do not exceed ratings of the device.
Model PR-276
Technical Information
TI.276-06
DUCT PRESSURE SENSOR
- Digital Volt-ohm Meter (DVM)
- Appropriate screwdriver for mounting screws
- Appropriate drill and drill bit for mounting screws
RANGE OUTPUT
R10 ("wc)
R11 ("wc)
R12 (pa)
R13 (pa)
0 TO 5.0 / 0 TO 2.5 / 0 TO 1.25
0 TO 15.0 / 0 TO 7.5 / 0 TO 3.75
0 TO 1250 / 0 TO 625 / 0 TO 312.5
0 TO 3750 / 0 TO 1875 / 0 TO 937.5
mA
(4–20 mA 2-wire)
VDC
(0–5 VDC/0 –10 VDC
field selectable)
Mounting
Wiring
Refer to Figure 7 for mounting dimensions.
1. Remove the transducer cover using a Phillips head
screwdriver.
2. Select the mounting location.
3. Mount transducer on a vertical surface with two #8 self-tapping
screws (not provided).
4. Pull wires through bottom of enclosure and make necessary
connections.
5. Replace cover and make pneumatic connections.
Use maximum 12 AWG wire for wiring terminals. Refer to Figures
1, 2, 3, & 4 for wiring information and Figures 5 & 6 for switch
designations.
(Wiring Instructions continued on pages 2 and 3.)
Page 2
Page 2 of 4
RoHS
Wiring PR-276 Units with mA Output
PR-276 Duct Pressure Transducer with mA Output
Model PR-276
Technical Information
TI.276-06
DUCT PRESSURE SENSOR
Wiring PR-276 Units with VDC Output
PR-276 Duct Pressure Transducer with VDC Output
Zu
Zb
S1 S2
ON
ON
Zu
S
MAMAC 9248
S
PR-276 pressure transducers with 4–20 mA output units are powered with a
12–40 VDC supply.
The following describes the proper wiring of these pressure transducers 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.
TYPICAL APPLICATIONS (wiring diagrams)
Figures 1 & 2 illustrate typical wiring diagrams for the PR-276 Series,
4–20 mA, two- wire output duct pressure transducers.
Figure 1 – Wiring for mA Output Duct Pressure Transducers with External DC
Power Supply
mA Output Transducer Only 12–40 VDC Power Supply
+
+
Controller / Meter / Recorder
Input Signal
+
Common
Shield/Ground
S3
Zu
ON
+
0
Zb
S1
ON ON
S2
Zu
S
MAMAC 9248
S
PR-276 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:
1. Remove the terminal block by carefully pulling it off the circuit board.
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 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 [0] and [-] terminals.
TYPICAL APPLICATIONS (wiring diagrams)
Figures 3 & 4 illustrate typical wiring diagrams for the PR-276,
0–5/0–10 VDC output duct pressure transducers.
Figure 3 – Wiring for VDC Output Duct Pressure Transducers when applied
with External AC Supply
VDC Output Transducer Only 12–35 VAC Transformer
Supply
Common
Signal
+
O
Controller / Meter / Recorder
Hot
+
Neutral
Input Signal
+
Common
Shield/Ground
Figure 2 – Wiring for mA Output Duct Pressure Transducers where Controller or
Meter has Internal DC Power Supply
mA Output Transducer Only
+
Controller / Meter / Recorder
Input Signal
+
Common
Shield/Ground
Figure 4 – Wiring for VDC Output Duct Pressure Transducers when applied
with External DC Power Supply
VDC Output Transducer Only 12–40 VDC Power Supply
Supply
Common
Signal
+
O
+
Controller / Meter / Recorder
Input Signal
+
Common
Shield/Ground
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-276 transducer.
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-276 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.
mandatory that correct phasing be maintained when powering more than one device from a single transducer.
Page 3
Page 3 of 4
RoHS
Model PR-276
Technical Information
TI.276-06
DUCT PRESSURE SENSOR
mA Output
Range Configuration:
R10 / R12 0 – 5.0 "wc / 1250 pa (default)
0 – 2.5 "wc / 625 pa
0 – 1.25 "wc / 312.5 pa
R11 / R13 0 – 15.0 "wc / 3750 pa (default)
0 – 7.5 "wc / 1875 pa
0 – 3.75 "wc / 937.5 pa
Factory Sealed
Figure 5 – Range Configurations for Pressure Transducers with mA Outputs
Switch 1 (S1)
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
Switch 2 (S2)
+ -
1
S1
ON
2
Zu S
Range Configuration:
R10 / R12 0 – 5.0 "wc / 1250 pa (default)
0 – 2.5 "wc / 625 pa
0 – 1.25 "wc / 312.5 pa
R11 / R13 0 – 15.0 "wc / 3750 pa (default)
0 – 7.5 "wc / 1875 pa
0 – 3.75 "wc / 937.5 pa
Factory Sealed
Figure 6 – Range Configurations for Pressure Transducers with VDC Outputs
VDC Output
Switch 1 (S1)
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
Switch 2 (S2)
ON
1
2
S3
+ - 0
Output Configuration:
0 – 10 VDC (default)
0 – 5 VDC
S1
ON
1
2
Zu S
Switch 3 (S3)
O N
1
2
O N
1
2
Page 4
Page 4 of 4
RoHS
Model PR-276
Technical Information
TI.276-06
DUCT PRESSURE SENSOR
CHECKOUT DIMENSIONAL DATA
Transducer
Operation
CALIBRATION
1. Verify that the unit is mounted in the correct position.
2. Verify appropriate input signal and supply voltage.
CAUTION: Never connect 120 VAC to these transducers.
Never connect AC voltage to a unit intended for DC supply.
3. Verify appropriate configuration range.
This is a rough functional check only.
1. Adjust the pressure to obtain maximum output signal for
appropriate range.
2. Output should be 20 mA or 5 or 10 VDC.
3. Adjust the pressure to obtain minimum output signal.
4. Output should be 4 mA or 0 VDC.
NOTE: The PR-276 is a highly accurate device. For
applications requiring a high degree of accuracy, the use of
laboratory quality meters and gauges are recommended.
All units are factory calibrated to meet or exceed published
specifications. If field adjustment is necessary, follow the
instructions below.
Calibration of PR-276 mA Units
1. Connect terminals [+] and [-] to the appropriate power
source.
2. Connect the DVM in series on the [-] terminal.
3. Apply low pressure to the unit and carefully adjust the zero
trimmer [Zu] to obtain desired low output.
4. Apply high pressure to the unit and adjust span trimmer [S]
to obtain the desired high output pressure.
5. Repeat steps 3 and 4 until desired calibration is achieved.
Figure 7 – PR-276 Duct Pressure Transducer Dimensions shown in inches and
millimeters (mm).
MAINTENANCE
FIELD REPAIR
WARRANTY
Calibration of PR-276 VDC Units
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 [0] and [-] terminal.
3. Apply low pressure to the unit and carefully adjust the zero
trimmer [Zu] to obtain desired low output.
4. Apply high pressure to the unit and adjust span trimmer [S]
to obtain the desired high output pressure.
5. Repeat steps 3 and 4 until desired calibration is achieved.
Regular maintenance of the total system is recommended to
assure sustained optimum performance.
None. Replace with a functional unit.
See Data Sheet for additional information.
For Technical / Application Assistance call your nearest office
8189 Century Boulevard • Minneapolis, MN 55317-8002 • USA
800-843-5116 • 952-556-4900 • Fax 952-556-4997
[email protected] • www.mamacsys.com
EUROPE
4200 Waterside Centre
Solihull Parkway
Birmingham • West Midlands
B37 7YN • United Kingdom
01384-271113 • Fax 01384-271114
ASIA
1 Fullerton Road #02-01
One Fullerton
Singapore • 049213
65-31581826 • Fax 65-31581826
MAMAC Systems, Inc., reserves the right to change any specifications
without notice to improve performance, reliability, or function of our products.
905-474-9215 • Fax 905-474-0876
08-8395-4333 • Fax 08-8395-4433
CANADA
675 Cochrane Drive
East Tower • 6th Floor
Toronto • Ontario
L3R 0B8 • Canada
AUSTRALIA
4 Armiger Court, Unit 2
Adelaide • S.A.
5088 • Australia
TI.276-06
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