OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2016 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or reduced to any electronic
medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA ENGINEERING, INC.
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST
OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR
number should then be marked on the outside of the return package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of
37 months
from date of purchase. OMEGA’s WARRANTY
adds an additional one (1) month grace period to the normal
three (3) year product warranty
to cover handling and shipping time. This ensures that OMEGA’s customers
receive maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an Authorized Return (AR) number immediately
upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does
not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper
repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a
result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control.
Components in which wear is not warranted, include but are not limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance
with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the company will be as specified and free of
defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY
WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of
purchaser set forth herein are exclusive, and the total liability of OMEGA with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the component upon which liability is based. In no event shall OMEGA be liable
for consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear
installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application, used
on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.
FOR
WARRANTY
RETURNS, please have the
following information available BEFORE contacting OMEGA:
1. Purchase Order number under which the product was PURCHASED,
2. Model and serial number of the product under warranty, and
3. Repair instructions and/or specific problems
relative to the product.
FOR
NON-WARRANTY
REPAIRS, consult OMEGA for current repair charges.
Have the following information available BEFORE contacting OMEGA:
1. Purchase Order number to cover the COST of the repair,
2. Model and serial number of the product, and
3. Repair instructions and/or specific problems
relative to the product.
RETURN REQUESTS/INQUIRIES
WARRANTY/DISCLAIMER
CHECKOUT
1. Verify that the unit is mounted in the correct position.
2. Verify appropriate input signal and supply voltage.
3. Verify appropriate configuration range.
Caution:
Never connect 120 VAC to these transducers. Never
connect AC voltage to a unit intended for DC supply.
CALIBRATION
Transducer
Operation
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.
Calibration of PX276 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
.
All units are factory calibrated to meet or exceed published specifications.
If field adjustment is necessary, follow the instructions below.
MAINTENANCE
Regular maintenance of the total system is recommended to assure
sustained optimum performance.
FIELD REPAIR
None. Replace with a functional unit.
WARRANTY
See Data Sheet for additional information.
Calibration of PX279 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.
Range 05
0 – 5.0 "wc / 1250 pa (default)
0 – 2.5 "wc / 625 pa
0 – 1.25 "wc / 312.5 pa
Range 15
0 – 15.0 "wc / 3750 pa (default)
0 – 7.5 "wc / 1875 pa
0 – 3.75 "wc / 937.5 pa
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
0 – 10 VDC (default)
0 – 5 VDC
1
2
O N
1
2
O N
NOTE: The PX276/PX279 is a highly accurate device. For
applications requiring a high degree of accuracy, the use of
laboratory quality meters and gauges are recommended.
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 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 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.
Figure 5 – Range Configurations for Pressure Transducers with mA Outputs
Figure 6 – Range Configurations for Pressure Transducers with VDC Outputs
Figure 4
–
Wiring for VDC Output Duct Pressure Transducers when applied with
External DC Supply.
Signal
+
Common
Supply
Common
Input Signal
O
Input Signal
+
Common
+
Shield/Ground
Controller / Meter / Recorder
VDC Output Transducer Only
12–40 VDC Power Supply
Range Configuration:
Switch 1 (S1)
Output Configuration:
Switch 3 (S3)
Switch 2 (S2)
Factory Sealed
2.66"
(67.5)
4.00"
(102)
3.00" (76.2)
3.00" (76.2)
3.25"
(82.6)
5.00” (127)
2.25”
(57.2)
8.00”
(203)
CHECKOUT
1. Verify that the unit is mounted in the correct position.
2. Verify appropriate input signal and supply voltage.
3. Verify appropriate configuration range.
Caution:
Never connect 120 VAC to these transducers. Never
connect AC voltage to a unit intended for DC supply.
CALIBRATION
Transducer
Operation
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.
Calibration of PX276 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
.
All units are factory calibrated to meet or exceed published specifications.
If field adjustment is necessary, follow the instructions below.
MAINTENANCE
Regular maintenance of the total system is recommended to assure
sustained optimum performance.
FIELD REPAIR
None. Replace with a functional unit.
WARRANTY
See Data Sheet for additional information.
Calibration of PX279 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.
Range 05
0 – 5.0 "wc / 1250 pa (default)
0 – 2.5 "wc / 625 pa
0 – 1.25 "wc / 312.5 pa
Range 15
0 – 15.0 "wc / 3750 pa (default)
0 – 7.5 "wc / 1875 pa
0 – 3.75 "wc / 937.5 pa
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
0 – 10 VDC (default)
0 – 5 VDC
1
2
O N
1
2
O N
NOTE: The PX276/PX279 is a highly accurate device. For
applications requiring a high degree of accuracy, the use of
laboratory quality meters and gauges are recommended.
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 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 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.
Figure 5 – Range Configurations for Pressure Transducers with mA Outputs
Figure 6 – Range Configurations for Pressure Transducers with VDC Outputs
Figure 4
–
Wiring for VDC Output Duct Pressure Transducers when applied with
External DC Supply.
Signal
+
Common
Supply
Common
Input Signal
O
Input Signal
+
Common
+
Shield/Ground
Controller / Meter / Recorder
VDC Output Transducer Only
12–40 VDC Power Supply
Range Configuration:
Switch 1 (S1)
Output Configuration:
Switch 3 (S3)
Switch 2 (S2)
Factory Sealed
2.66"
(67.5)
4.00"
(102)
3.00" (76.2)
3.00" (76.2)
3.25"
(82.6)
5.00” (127)
2.25”
(57.2)
8.00”
(203)
CHECKOUT
1. Verify that the unit is mounted in the correct position.
2. Verify appropriate input signal and supply voltage.
3. Verify appropriate configuration range.
Caution:
Never connect 120 VAC to these transducers. Never
connect AC voltage to a unit intended for DC supply.
CALIBRATION
Transducer
Operation
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.
Calibration of PX276 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
.
All units are factory calibrated to meet or exceed published specifications.
If field adjustment is necessary, follow the instructions below.
MAINTENANCE
Regular maintenance of the total system is recommended to assure
sustained optimum performance.
FIELD REPAIR
None. Replace with a functional unit.
WARRANTY
See Data Sheet for additional information.
Calibration of PX279 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.
Range 05
0 – 5.0 "wc / 1250 pa (default)
0 – 2.5 "wc / 625 pa
0 – 1.25 "wc / 312.5 pa
Range 15
0 – 15.0 "wc / 3750 pa (default)
0 – 7.5 "wc / 1875 pa
0 – 3.75 "wc / 937.5 pa
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
0 – 10 VDC (default)
0 – 5 VDC
1
2
O N
1
2
O N
NOTE: The PX276/PX279 is a highly accurate device. For
applications requiring a high degree of accuracy, the use of
laboratory quality meters and gauges are recommended.
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 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 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.
Figure 5 – Range Configurations for Pressure Transducers with mA Outputs
Figure 6 – Range Configurations for Pressure Transducers with VDC Outputs
Figure 4
–
Wiring for VDC Output Duct Pressure Transducers when applied with
External DC Supply.
Signal
+
Common
Supply
Common
Input Signal
O
Input Signal
+
Common
+
Shield/Ground
Controller / Meter / Recorder
VDC Output Transducer Only
12–40 VDC Power Supply
Range Configuration:
Switch 1 (S1)
Output Configuration:
Switch 3 (S3)
Switch 2 (S2)
Factory Sealed
2.66"
(67.5)
4.00"
(102)
3.00" (76.2)
3.00" (76.2)
3.25"
(82.6)
5.00” (127)
2.25”
(57.2)
8.00”
(203)
CHECKOUT
1. Verify that the unit is mounted in the correct position.
2. Verify appropriate input signal and supply voltage.
3. Verify appropriate configuration range.
Caution:
Never connect 120 VAC to these transducers. Never
connect AC voltage to a unit intended for DC supply.
CALIBRATION
Transducer
Operation
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.
Calibration of PX276 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
.
All units are factory calibrated to meet or exceed published specifications.
If field adjustment is necessary, follow the instructions below.
MAINTENANCE
Regular maintenance of the total system is recommended to assure
sustained optimum performance.
FIELD REPAIR
None. Replace with a functional unit.
WARRANTY
See Data Sheet for additional information.
Calibration of PX279 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.
Range 05
0 – 5.0 "wc / 1250 pa (default)
0 – 2.5 "wc / 625 pa
0 – 1.25 "wc / 312.5 pa
Range 15
0 – 15.0 "wc / 3750 pa (default)
0 – 7.5 "wc / 1875 pa
0 – 3.75 "wc / 937.5 pa
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
0 – 10 VDC (default)
0 – 5 VDC
1
2
O N
1
2
O N
NOTE: The PX276/PX279 is a highly accurate device. For
applications requiring a high degree of accuracy, the use of
laboratory quality meters and gauges are recommended.
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 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 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.
Figure 5 – Range Configurations for Pressure Transducers with mA Outputs
Figure 6 – Range Configurations for Pressure Transducers with VDC Outputs
Figure 4
–
Wiring for VDC Output Duct Pressure Transducers when applied with
External DC Supply.
Signal
+
Common
Supply
Common
Input Signal
O
Input Signal
+
Common
+
Shield/Ground
Controller / Meter / Recorder
VDC Output Transducer Only
12–40 VDC Power Supply
Range Configuration:
Switch 1 (S1)
Output Configuration:
Switch 3 (S3)
Switch 2 (S2)
Factory Sealed
2.66"
(67.5)
4.00"
(102)
3.00" (76.2)
3.00" (76.2)
3.25"
(82.6)
5.00” (127)
2.25”
(57.2)
8.00”
(203)
CHECKOUT
1. Verify that the unit is mounted in the correct position.
2. Verify appropriate input signal and supply voltage.
3. Verify appropriate configuration range.
Caution:
Never connect 120 VAC to these transducers. Never
connect AC voltage to a unit intended for DC supply.
CALIBRATION
Transducer
Operation
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.
Calibration of PX276 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
.
All units are factory calibrated to meet or exceed published specifications.
If field adjustment is necessary, follow the instructions below.
MAINTENANCE
Regular maintenance of the total system is recommended to assure
sustained optimum performance.
FIELD REPAIR
None. Replace with a functional unit.
WARRANTY
See Data Sheet for additional information.
Calibration of PX279 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.
Range 05
0 – 5.0 "wc / 1250 pa (default)
0 – 2.5 "wc / 625 pa
0 – 1.25 "wc / 312.5 pa
Range 15
0 – 15.0 "wc / 3750 pa (default)
0 – 7.5 "wc / 1875 pa
0 – 3.75 "wc / 937.5 pa
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
0 – 10 VDC (default)
0 – 5 VDC
1
2
O N
1
2
O N
NOTE: The PX276/PX279 is a highly accurate device. For
applications requiring a high degree of accuracy, the use of
laboratory quality meters and gauges are recommended.
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 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 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.
Figure 5 – Range Configurations for Pressure Transducers with mA Outputs
Figure 6 – Range Configurations for Pressure Transducers with VDC Outputs
Figure 4
–
Wiring for VDC Output Duct Pressure Transducers when applied with
External DC Supply.
Signal
+
Common
Supply
Common
Input Signal
O
Input Signal
+
Common
+
Shield/Ground
Controller / Meter / Recorder
VDC Output Transducer Only
12–40 VDC Power Supply
Range Configuration:
Switch 1 (S1)
Output Configuration:
Switch 3 (S3)
Switch 2 (S2)
Factory Sealed
2.66"
(67.5)
4.00"
(102)
3.00" (76.2)
3.00" (76.2)
3.25"
(82.6)
5.00” (127)
2.25”
(57.2)
8.00”
(203)
CHECKOUT
1. Verify that the unit is mounted in the correct position.
2. Verify appropriate input signal and supply voltage.
3. Verify appropriate configuration range.
Caution:
Never connect 120 VAC to these transducers. Never
connect AC voltage to a unit intended for DC supply.
CALIBRATION
Transducer
Operation
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.
Calibration of PX276 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
.
All units are factory calibrated to meet or exceed published specifications.
If field adjustment is necessary, follow the instructions below.
MAINTENANCE
Regular maintenance of the total system is recommended to assure
sustained optimum performance.
FIELD REPAIR
None. Replace with a functional unit.
WARRANTY
See Data Sheet for additional information.
Calibration of PX279 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.
Range 05
0 – 5.0 "wc / 1250 pa (default)
0 – 2.5 "wc / 625 pa
0 – 1.25 "wc / 312.5 pa
Range 15
0 – 15.0 "wc / 3750 pa (default)
0 – 7.5 "wc / 1875 pa
0 – 3.75 "wc / 937.5 pa
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
0 – 10 VDC (default)
0 – 5 VDC
1
2
O N
1
2
O N
NOTE: The PX276/PX279 is a highly accurate device. For
applications requiring a high degree of accuracy, the use of
laboratory quality meters and gauges are recommended.
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 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 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.
Figure 5 – Range Configurations for Pressure Transducers with mA Outputs
Figure 6 – Range Configurations for Pressure Transducers with VDC Outputs
Figure 4
–
Wiring for VDC Output Duct Pressure Transducers when applied with
External DC Supply.
Signal
+
Common
Supply
Common
Input Signal
O
Input Signal
+
Common
+
Shield/Ground
Controller / Meter / Recorder
VDC Output Transducer Only
12–40 VDC Power Supply
Range Configuration:
Switch 1 (S1)
Output Configuration:
Switch 3 (S3)
Switch 2 (S2)
Factory Sealed
2.66"
(67.5)
4.00"
(102)
3.00" (76.2)
3.00" (76.2)
3.25"
(82.6)
5.00” (127)
2.25”
(57.2)
8.00”
(203)
CHECKOUT
1. Verify that the unit is mounted in the correct position.
2. Verify appropriate input signal and supply voltage.
3. Verify appropriate configuration range.
Caution:
Never connect 120 VAC to these transducers. Never
connect AC voltage to a unit intended for DC supply.
CALIBRATION
Transducer
Operation
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.
Calibration of PX276 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
.
All units are factory calibrated to meet or exceed published specifications.
If field adjustment is necessary, follow the instructions below.
MAINTENANCE
Regular maintenance of the total system is recommended to assure
sustained optimum performance.
FIELD REPAIR
None. Replace with a functional unit.
WARRANTY
See Data Sheet for additional information.
Calibration of PX279 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.
Range 05
0 – 5.0 "wc / 1250 pa (default)
0 – 2.5 "wc / 625 pa
0 – 1.25 "wc / 312.5 pa
Range 15
0 – 15.0 "wc / 3750 pa (default)
0 – 7.5 "wc / 1875 pa
0 – 3.75 "wc / 937.5 pa
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
1
2
O N
0 – 10 VDC (default)
0 – 5 VDC
1
2
O N
1
2
O N
NOTE: The PX276/PX279 is a highly accurate device. For
applications requiring a high degree of accuracy, the use of
laboratory quality meters and gauges are recommended.
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 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 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.
Figure 5 – Range Configurations for Pressure Transducers with mA Outputs
Figure 6 – Range Configurations for Pressure Transducers with VDC Outputs
Figure 4
–
Wiring for VDC Output Duct Pressure Transducers when applied with
External DC Supply.
Signal
+
Common
Supply
Common
Input Signal
O
Input Signal
+
Common
+
Shield/Ground
Controller / Meter / Recorder
VDC Output Transducer Only
12–40 VDC Power Supply
Range Configuration:
Switch 1 (S1)
Output Configuration:
Switch 3 (S3)
Switch 2 (S2)
Factory Sealed
2.66"
(67.5)
4.00"
(102)
3.00" (76.2)
3.00" (76.2)
3.25"
(82.6)
5.00” (127)
2.25”
(57.2)
8.00”
(203)
M3505/0816
Servicing North America:
U.S.A.
Omega Engineering, Inc.
Headquarters: Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: (203) 359-1660 • Fax: (203) 359-7700 • e-mail: [email protected]
