Setra 267 Operating Manual
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.
Electrical
connections
+EXC GND +SIG
Range select switches
(267MR version only)
Span
Zero
Diagram 1
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 common on the circuit (see diagram
2). The excitation/output specications are:
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.
Voltage circuit diagram
Power
supply
Readout
or
DAS
+EXC
GND
+SIG
Model
267MR
Diagram 2
+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:
PIN 1
+ output
Diagram 3
PIN 4
+ EXC
PINS 8,9*
common
9 pin D-sub connector
Connection
+Excitation 4
+Output 1
Common 9
electric termination
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
Diagram 4
* Pins 8 and 9 are internally commoned together, user can connect to either pin.
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.
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