Johnson Controls DPT267 Series, DPT267MR Series Installation Guide

Setra Systems

Operating Instructions

DPT267 and DPT267MR Series Low Pressure Transducers

1. GENERAL INFORMATION

Every Model 267 and Model 267MR (Multi-Range) has been tested and calibrated before shipment.
Specific performance specifications are listed on Page 9 of this Guide.
The Model 267 is single range only. The Model 267MR has field 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 field, the 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 voltage output, configurable: 0 to 5
VDC or 0 to 10 VDC, and a current output: 4 to 20 mA
Sections 1 through 4 and 7 through 9 of this Guide apply to both Model 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 non-conducting 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:

1. 3/16” O.D. Barbed Brass Pressure Fittings – Typically installed with 1/4” push-on tubing.

2. 1/4” NPT Brass Pressure Fittings – Typically installed with mating NPT male fitting.

3. 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” NPT pressure fittings, 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 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 an optional PG-9 or 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, PG-9 or PG-13.5 Electrical Termination

(267MR version only)

Wiring terminations are identified on the circuti 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

Range Select Switches

Connections

Diagram 1

The Model 267 and 267MR voltage output is a 3-wire circuit, with three terminals available for wiring
(see Diagram 1). The -Excitation and -Output are commoned on the circuit (see Diagram 2). The
excitation/output specifications 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 field 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 VDC or 0-10 VDC
output, calibrated at the factory.

Voltage Circuit Diagram

Power
Supply

Readout or

DAS

Diagram 2

+EXC Connected to positive terminal of DC or AC Power Supply
GND Connect as the reference port for power supply and output signal
+SIG Connect to positive terminal of Control or Pressure Monitor

+EXC

GND

+SIG

Model

267MR

3.2 Voltage Output Units – 9 pin D-sub Connector Electrical Termination

Device

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 shows in Diagram 4.

Diagram 4

PIN 1

PIN 4

CONNECTION 9 pin D-sub Connector

Electrical Termination

+EXCITATION 4
+OUTPUT 1

COMMON 9

Excitation Output

PIN 9

- EXC

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 3

3.3 Current Output Units 1/2” Conduit Opening, PG-9 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 24 VDC
loop supply voltage and a 250 ohm load.

Electrical
Connections

Range Select Switches
(267MR version only)

Diagram 5

9 to 30 VDC

Current

Monitoring

Diagram 6

+

-

267MR