Model 267 & 267MR
Operating Instructions
Setra Systems, Inc.
159 Swanson Road, Boxborough, MA 01719
800.257.3872 • www.setra.com
1.0 General information
Every model 267 and Model 267MR (multi-range) has been tested and calibrated before
shipment. Specic performance specications are listed on page 9 of this guide.
The model 267 is single range only. The model 267MR has eld selectable range capability.
The 267MR is factory calibrated for the highest pressure range. The range label on the cover
of the unit indicates the factory-calibrated range. Should the 267MR be re-ranged in the eld,
other multi-range labels are included.
Setra Systems 267 and 267MR pressure transducers sense differential or gauge (static)
pressure and convert this pressure difference to a proportional high level analog output for both
unidirectional and bidirectional pressure ranges. Two output versions are offered: A congurable
voltage output of 0 to 5 VDC or 0 to 10 VDC, and a current output of 4 to 20 mA.
Sections 1 through 4 and 7 through 9 of this guide apply to both models 267 and 267MR.
Section 5 refers to the model 267 only. Section 6 refers to the model 267MR only.
2.0 Mechanical installation
2.1 Media compatibility
Model 267 and 267MR transducers are designed to be used with air or nonconducting gases.
Use with liquids or corrosive gases will damage the unit.
2.2 Environment
The operating temperature limits of the 267 and 267MR are as follows:
Operating temperature 0°F to +150°F (-18°C to +65°C)
Compensated temperature range +40°F to +150°F (+5°C to +65°C)
2.3 Pressure ttings
The Model 267 and 267MR can be supplied with three different pressure tting congurations:
A. 3/16” O.D. Barbed brass pressure ttings – Typically installed with 1/4” push-on tubing
B. 1/4”NPT Brass pressure ttings – Typically installed with mating NPT male tting.
C. Static pressure probe – Installed on the duct by drilling a 7/16” hole in the duct at the
desired mounting location, inserting the pressure probe into the duct, and mounting the
267 onto the duct with the mounting tabs.
For the 3/16” O.D. and 1/4” NPTF pressure ttings, both the positive (high) pressure port and
the reference (low) pressure port are located on the bottom of the unit, labeled “high” and “low”
respectively. For the best results (shortest response times), 3/16” I.D. for tubing is suggested
for tubing lengths up to 100 feet long, 1/4” I.D. for tubing lengths up to 300 feet, and 3/8” I.D.
for tubing lengths up to 900 feet.
The static pressure probe is positive (high) pressure port located on the back of the unit. The
reference (low) pressure port is located on the bottom of the unit and can be used for differential
pressure measurements.
3.0 Electrical installation
Wiring is through a 1/2” conduit opening or factory installed PG-9, PG-13.5 or 9 pin D-sub
connector. (See section 3.2 for instructions on wiring the 9 pin D-sub connector). Both current
and voltage output units are reverse wiring protected.
3.1 Voltage output units
1/2” conduit opening, PG9 or PG-13.5 electrical termination
Wiring terminations are identied on the circuit board below the terminal strip (see section 3.1
for voltage output units or Section 3.3 for current units). To access the terminal strip, turn the
screws on top of the case counter clockwise until the cover can be removed. The screws are
captured and will be secured in the top of the case.
The model 267and 267MR voltage output is a 3-wire circuit, with three terminals available for
winning (see diagram 1).The -excitation and -output are commoned on the circuit (see diagram
2). The excitation/output specications are:
Electrical
connections
Range select switches
(267MR version only)
+EXC GND +SIG
Zero
Span
Excitation Output
9 to 30 VAC/ 11.5 to 42 VDC 0 to 5 VDC
12 to 30 VAC/ 13 to 42 VDC 0 to 10 VDC
The 267MR has a eld selectable 0-5 or 0-10 VDC output. (See section 6.0 for switch settings
to determine whether the voltage output is set to 0-5 or 0-10 VDC). The 267 has either a 0-5
or 0-10 output, calibrated at the factory.
Diagram 1
+EXC
GND
Model
267MR
Power
supply
Readout
or
DAS
Diagram 2
+SIG
+EXC Connected to positive terminal of DC or AC power supply
GND Connect as the reference for power supply and output signal
+SIG Connect to positive terminal of control or pressure monitor
3.2 Voltage output units:
9 pin D-sub connector electrical termination
The model 267 and 267MR voltage output is a 3-wire circuit, with three pins available
for wiring (see diagram 3). The voltage output pin designations are shown in diagram 4:
Connection
9 pin D-sub connector
electric termination
+Excitation 4
+Output 1
Common 9
Excitation Output
9 to 30 VAC / 11.5 to 42 VDC 0 to 5 VDC
12 to 30 VAC / 13 to 42 VDC 0 to 10 VDC
PIN 1
+ output
PIN 4
+ EXC
PINS 8,9*
common
Diagram 3
Diagram 4
* Pins 8 and 9 are internally commoned together, user can connect to either pin.
Voltage circuit diagram
3.3 Current output units:
1/2’’ conduit opening, PG9 or PG-13.5 electrical termination
The model 267 and 267MR is a two-wire loop-powered 4 to 20mA current output unit (see
diagram 5). The current flows into +EXC terminal and returns back to the power supply through
the -EXC terminal (see diagram 6). The power supply must be a DC voltage source with a voltage
range between 9 and 30 measured between terminal +EXC and -EXC. The unit is calibrated
with a 24VDCC loop supply voltage and a 250 ohm load.
Diagram 5 Diagram 6
267MR
9 to 30 VDC
+
_
Current
Monitor
Devce
+EXC -
Span
Zero
Range select switches
(267MR version only)
Electrical connections
3.4 Current output units:
9 pin D-sub connector electrical termination
The model 267 and 267MR is a two-wired loop-powered 4 to 20mA current output unit (see
diagram 6). The current flows into +EXC. Pin 4 (+EXC) and return to the power supply through
pin 9 (-EXC) (see diagram 7). The power supply must be a DC voltage source with a voltage
range between 9 and 30 measured between pin 4 and pin 9 (-EXC). The unit is calibrated with
a 24VDC loop supply voltage and a 250 ohm load. The current output9 pin D-sub connector
pin designations are shown in diagram 8.
Connection 9 pin D-sub connector
+Excitation 4
-Excitation 9
PIN 4
+ EXC
PIN 9
- EXC
Diagram 7 Diagram 8
3.5 4-20 mA circuit diagram
Minimum supply voltage (VDC)=9+0.02x (resistance of receiver plus line) maximum supply
voltage (VDC)=30+0.004x (resistance of receiver plus line). If the current loop has a current
limiter, the threshold should be adjusted to 35 mA minimum (see diagram 9).
Diagram 9
30
Loop supply voltage (Vdc)
Operating
range
9
Loop resistance (Ohms)
0
Loop power supply vs. Loop resistance for
4 to 20 mA current transducers
3.6 EMC compliance
This product complies with EN61326-1:2006 in accordance with EN61326-2-3:2006 to be
used in controlled EM immunity and class B emission environment. Special cautions much
be taken to fully meet EU EMC compliance:
1. Shielded cable must be used, and the shield must be tied to earth ground (not
power supply ground) on at least one end of the cable shield/drain wire. The
shield must be maintained all the way from sensor to the power supply
2. If unshielded cable is used, an earth grounded metal conduit tting can be used
to replace the shielded cable.
3. For a sensor with a metal body or enclosure, the body/enclosure must be
grounded to earth.
4. If a protective plastic housing is used, the housing must be able to withstand
at least 2 KV from the housing to earth ground, without damaging the circuit.
5. The unit shall be installed or operated in a controlled electromagnetic
environment.
4.0 Calibration
The 267 and 267MR transducer is factory calibrated and should require no eld adjustment.
Generally, the mounting position will have a zero shift effect on ranges below 1” WC.
Whenever possible, any zero and/or span offsets should be corrected by software
adjustment in the user’s control system. However, both zero and span adjustments are
accessible under the cover of the unit, below and to the right of the terminal strip. The
267 and 267MR transducer is calibrated in the vertical position at the factory (mounting
tabs vertical).
4.1 Voltage output units zero adjustment
While monitoring the voltage between the positive output (+SIG) and common (GND), and
with both pressure ports open to atmosphere, the zero may be adjusted by turning the zero
adjustment screw. (See diagram 1 for location of zero adjustment.)
Factory settings are:
Unidirectional pressure ranges Bidirectional pressure ranges
Zero adjustment Output Zero adjustment Output
0.05 VDC (±25 mV) 0-5 VDC 2.5 VDC (±25 mV) 0-5 VDC
0.05 VDC (±50 mV) 0-10 VDC 5 VDC (±50 mV) 0-10 VDC
4.2 Voltage output span adjustment
(Complete the zero adjustment before setting span.)
Span or full scale output adjustments should only be performed by using an accurate pressure
standard (electronic manometer, digital pressure gauge, etc.), with at least comparable accuracy
to the 267 or 267MR transducer (<±1% FS).
With full range pressure applied to the high pressure port (reference port open to atmosphere),
the span may be adjusted by turning the SPAN adjustment screw. (See diagram 1 for location
of SPAN adjustment). Factory settings are:
Unidirectional pressure ranges Bidirectional pressure ranges
Span adjustment Output Span adjustment Output
5.0 VDC (±25 mV) 0-5 VDC 2.5 VDC (±25 mV) 0-5 VDC
10 VDC (±50 mV) 0-10 VDC 5 VDC (±50 mV) 0-10 VDC
Example 1: Unidirectional pressure range of 0 to 1” W.C. with 0 to 5 VDC output
Apply 1.00” W.C., adjust span to 5 VDC (± mv)
Example 2: Bidirectional pressure range of ±5” W.C. with 0 to 5VDC output
Apply 5.00” W.C., adjust span to 5 VDC (±25 mV)
4.3 Current output zero adjustment
While monitoring the current output, and with both pressure ports open to atmosphere, the
zero may be adjusted by turning the zero adjustment screw. (See diagram 3 for location of zero
adjustment) Factory settings are:
Unidirectional pressure ranges Bidirectional pressure ranges
Zero adjustment Output Zero adjustment Output
4mA (0.08 mA) 4-20 mA 12 mA (0.08 mA) 4-20 mA
4.4 Current output span adjustment
Span or full scale output adjustments should only be performed by using an accurate pressure
standard (electronic manometer, digital pressure gauge, ect.) with at least comparable accuracy
to the 267 or 267MR transducer (<±1% FS). With full range pressure applied to the high pressure
port (reference port open to atmosphere), the span maybe adjusted by turning the SPAN
adjustment screw. (see diagram 1 for location of SPAN adjustment). Factory settings are:
Unidirectional pressure ranges Bidirectional pressure ranges
Span Adjustment Output Span Adjustment Output
20mA (0.08 mA) 4-20 mA 20 mA (0.08 mA) 4-20 mA
Example 1: Unidirectional pressure range of 0 to 1” W.C. with 4 to 20 mA output
Apply 1.00” W.C., adjust span to 20 mA (±0.08mA)
Example 2: Bidirectional pressure range of 5” W.C. with 4 to 20 mA output
Apply 5.00” W.C., adjust span to 20 mA (±0.08 mA)
5.0 Model 267 optional LCD display
The model 267 is available with an optional 3 1/2 digit LCD display. The LCD display is adjusted
at the factory prior to shipment. The LDC is connected to the zero and span adjustment
potentiometers. Therefore, adjustment of the zero and span according to section 4 adjusts
the LCD display.
6.0 Multi-range operation - model 267MR only
The 267MR is re-rangeable by accessing the switches located internal to the transducer
housing. To access the “Dip” switches, remove the screws on the top of the case and lift off
the cover. The “Dip” switches are located on the electronics board as shown in diagrams 1 and
5. The voltage output version has 5 switches. The current version has 4. The location of these
switches, “on” (up position) or “off” (down position), determine what range has been selected.
See table 1 or 2 below for switch positions for in WC or Pascals.
Multi-range units are factory set to the highest range. As an example, an MR2 range is factory
set to 0 to 1” W.C.
If the 267MR range is re-congured from the factory calibration, place the correct range label
(enclosed) on the cover label, over the area indicating the factory default range.
NOTES: Voltage output is set based upon ordering code. See switch settings below to conrm
voltage output. The 4-20 mA current version has only 4 switches.
ON
1
2 345
ON
1 2 3 4 5
To change the range to
0 to .25”W.C. with a 0-10
VDC output, change the
switches to:
If it is a 0-5 VDC output,
the switches are set:
NOTE: Black square in diagram indicates switch position.
Table 1: Range switching instructions for inches of water column
Table 2: Range switching instructions for pascal ranges
MR1
range
MR2
range
MR3
range
MR4
range
Switch settings
0-5V output
Switch settings
0-10V output
Switch settings
4-20MA output
0-.5” 0-2.5” 0-15”
ON
1 2 3 4
ON
123 4 5
ON
1 234 5
0-.25” 0-1.25” 0-7.5”
ON
1 2 3 4
ON
1 2 3 4 5
ON
1 2 3 4 5
±0.05” ±.5” ±2.5” ±15”
ON
1 2 3 4
ON
1 234 5
ON
123 4 5
±.25” ±1.25” ±7.5”
ON
1 2 3 4
ON
1 2 3 4 5
ON
1 2 3 4 5
±1.25” ±.625” ±3.75”
ON
123 4
ON
123 4 5
ON
123 4 5
0-0.1” 0-1” 0-5” 0-30”
ON
1 2
3 4 5
ON
1
2 3 4 5
ON
1 2 3 4 5
Factory default setting
MR5
range
MR6
range
MR7
range
MR8
range
MR9
range
Switch settings
0-5V output
Switch settings
0-10V output
Switch settings
4-20mA output
0-100 Pa 0-500 Pa 0-1250 Pa 0-3750 Pa
ON
1 2 3 4
ON
1 2 3 4 5
ON
1 234 5
0-50 Pa 0-250 Pa 0-625 Pa 0-1875 Pa
ON
1 2 3 4
ON
1 2 3 4 5
ON
1 2 3 4 5
±12.5 Pa ±100 Pa ±500 Pa ±1250 Pa ±3750 Pa
ON
1 2 3
4
ON
1
2 3 4 5
ON
1 2 345
±50 Pa ±250 Pa ±625 Pa ±1875 Pa
ON
1 2 3 4
ON
1 2
3 4 5
ON
1 234
5
±25 Pa ±125 Pa ±312 Pa ±937 Pa
ON
1 2 3
4
ON
1 2 3 4 5
ON
1 2 3 4 5
0-25 PA 0-200 Pa 0-1000 Pa 0-2500 Pa 0-7500 Pa
ON
1 2 3 4
ON
1 2 3 4 5
ON
1 2 3 4 5
Factory default setting
NOTE: Black square in diagram indicates switch position.
NOTE: Black square in diagram indicates switch position
7.0 Model 267 & 267MR performance specications
8.0 Model 267 desiccant cover
The desiccant can be easily regenerated or replaced. When the desiccant has absorbed all
the moisture it can hold, the user is alerted through the clearly visible status window, which
changes from blue (dry) to pink (saturated).
(Note: Life expectancy of the desiccant is approximately six months)
8.1 Regenerate the desiccant
The desiccant can be regenerated by removing the cover from the base and baking it in a
conventional oven at 200°F for 3-4hours or until it returns to its dry status (blue).
8.2 Replacing the desiccating cover
To ensure the uninterrupted system operation, replacement covers with desiccant are available.
Contact your local representative or Setra System’s customer service department at
(800) 257-3872 to order.
General specications
Accuracy RSS* (at constant temperature ±1.0% FS
Non-linearity, BFSL ±0.98 FS
Hysteresis ±0.2% FS
Non-repeatability ±0.1% FS
Compensated temperature range 40° to 150°F (5° to 65° C)
Zero/span shift, %FS/°F(°C) 0.033 (0.06)
Maximum line pressure 10 PSI
Overpressure Up to 10 PSI (range dependent)
Warm-up shift ±0.1% FS total
Position effects (unit is factory calibrated at 0g effect in the vertical position
Range Zero offset (%FS/G)
0 to 0.1” W.C. 2.1
0 to 1” W.C. 0.22
0 to 5” W.C. 0.14
*RSS of non-linearity, non-repeatability and hysteresis.
9.0 Returning products for repair
Please contact a Setra application engineer (800-257-3872, 978-263-1400) before returning
unit for repair to review information relative to your application. Many times only minor eld
adjustments may be necessary. When returning a product to Setra, the material should be
carefully packaged and shipped prepaid to:
Setra Systems, Inc.
159 Swanson Road
Boxborough, MA 01719-1304
Attn: Repair Department
To ensure prompt handling, please supply the following information and include it inside the
package or returned material:
• Name and phone number of person to contact.
• Shipping and billing instructions.
• Full description of the malfunctions.
• Identify any hazardous material used with the product.
NOTES:
Please remove any pressure ttings and plumbing that you have installed and enclose any
required mating electrical connectors and wiring diagrams.
Allow approximately 3 weeks after receipt at Setra for the repair and return of the unit. Nonwarranty repairs will not be made without customer approval and a purchase order to cover
repair chargers.
Calibration services
Setra maintains a complete calibrations facility that is traceable to the National Institute of
Standards and Technology (NIST). If you would like to recalibrate or re-certify your Setra
pressure transducers or transmitters, please call our Repair Department at 800-257-3872
(978-263-1400) for scheduling.
10.0 Limited warranty & limitation of repair
Setra warrants its products to be free from defects in materials and workmanship, subject to
the following terms and conditions. Without charge, Setra will repair or replace products found
to be defective in materials or workmanship within the warranty period; provided that:
A) The product has not been subjected to abuse, neglect, accident, incorrect wiring
not our own, improper installation or servicing, or use in violation of instructions
furnished by Setra
B) The product has not been repaired or altered by anyone except Setra or its
authorized service agencies
C) The serial number or date code has not been removed, defaced, or otherwise
changed
D) Examination discloses, in the judgment of Setra, the defect in materials or
workmanship developed under normal installation, use, and service
E) Setra is notied in advance of and the product is returned to Setra transportation
prepaid
Unless otherwise specied in a manual or warranty card, or agreed to in a writing signed by a
Setra ofcer, Setra pressure, and acceleration products shall be warranted for one year from
date of sale.
The foregoing warranty is in lieu of all warranties, express, implied or statutory, including but
not limited to, any implied warranty of merchantability for a particular purpose.
Setra’s liability for breach of warranty is limited to repair or replacement, or if the goods cannot
be repaired or replaced, to a refund of the purchase price.
Setra’s liability for all other breaches is limited to a refund of the purchase price. In no instance
shall Setra be liable for incidental or consequential damages arising from a breach of warranty,
or from the use or installation of its products.
No representative or person is authorized to give any warranty other than as set out above or
to assume for Setra any other liability in connection with the sale of its products.
SS2039 Rev. H 08/2018
Setra Systems, Inc.
159 Swanson Road, Boxborough, MA 01719
800.257.3872 • www.setra.com
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