Setra System 267MR - Manual (Page 5)

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 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 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
Electrical 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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