Mechanical Installation; Electrical Installation - Setra Systems 267 Installation Manual

2.0 MECHANICAL INSTALLATION

2.1 Media Compatibility
Model 267 and 267MR transducers are designed to be used with air or noncon-
ducting 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
Compensated Temperature Range
2.3 Pressure Fittings
The Model 267 and 267MR can be supplied with three different pressure fitting
configurations:
A. 3/16" O.D. Barbed Brass Pressure Fittings – Typically installed with 1/4"
push-on tubing
B. 1/4"NPT Brass Pressure Fittings – Typically installed with mating NPT
male fitting.
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 fittings, both the positive (high) pres-
sure port and the reference (low) pressure port are located on the bottom of the
unit, labeled "HIGH" and "LOW" respectively. For best results (shortest response
times), 3/16" I.D. 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 the 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 protect-
ed.
3.1 Voltage Output Units - 1/2" Conduit Opening, PG9 or PG-13.5 Elec-
trical Termination
Wiring terminations are identified 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.
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0°F to +150°F (-18°C to +65°C)
+40°F to +150°F (+5°C to +65°C)
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
Span Adjustment Output
5.0 VDC (±25 mV) 0-5 VDC
10 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
Zero Adjustment Output
4mA (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 ac-
curate 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 atmo-
sphere), 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
Span Adjustment Output
20mA (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 LCD is connected to the zero and
span adjustment potentiometers. Therefore, adjustment of the zero and span ac-
cording to Section 4 adjusts the LCD display.
Bidirectional Pressure Ranges
Span Adjustment Output
2.5 VDC (±25 mV) 0-5 VDC
5 VDC (±50 mV) 0-10 VDC
Bidirectional Pressure Ranges
Zero Adjustment Output
12 mA (0.08 mA) 4-20 mA
Bidirectional Pressure Ranges
Span Adjustment Output
20 mA (0.08 mA) 4-20 mA
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