Johnson Controls SERIES DPT 209 OPERATING INSTRUCTIONS

SETRA

OPERATING INSTRUCTIONS

SERIES DPT 209

PRESSURE TRANSDUCERS

1.0 GENERAL INFORMATION

Every Model DPT209 has been tested and calibrated before shipment.
Setra Systems DPT209 pressure transducers sense gauge pressure and convert this pressure

difference to a proportional high level analog output. Three standard output and excitation
versions are offered:

Excitation Output
9 to 28 VDC 4 to 20mA – (Must Observe Polarity)

9 to 30 VDC 0.5 to 5.5 VDC – (Reverse Excitation Protection)

4.9 to 8.1 VDC 0.5 to 4.5 VDC – (No Reverse Wire Protection)

2.0 MECHANICAL INSTALLATION

2.1 Media Compatibility

Model DPT209 transducers are designed to be used with any gas or liquid compatible with 17-4 PH
stainless steel. Never totally submerge the unit in any liquid.

2.2 Environment

The operating temperature limits of the DPT209 are –40° to +185°F (-40 to +85°C). The
compensated temperature range is –4 to +176°F (-20 to +80°C)

2.3 Pressure Fittings

Typically, standard pipe fittings should be used. However, for pressure ranges in excess of 500 psig,
we suggest the use of a sealant such as Loctite Hydraulic Sealant. Excessive torquing of metal
fittings may cause a slight zero shift. The use of plastic fittings typically results in no noticeable
zero shift. Torquing does not appreciably affect linearity or sensitivity.

2.4 Tube Stub Welding Instructions

Standard welding practices should be followed. Caution must be taken to protect the sensor against
current paths that could damage the circuit board. Apply a heat sink between the weld zone and
the sensor that is large enough to protect the sensor from overheating. Failure to use a heat sink
may damage the housing seal or circuit board.

2.5 Venting

Because the reference pressure in a sealed gage transducer will vary due to changes in
temperature and will affect overall accuracy (especially in units of less than 500 psig range), all
DPT209 Series transducers are available as vented or sealed to atmosphere.

Vented units are ordered as PSIG ranged units. Sealed units are ordered as PSIS range units. The
DPT209 PSIG transducers are vented through the cable. Hirschmann PSIG transducers are vented
through the connector. Packard PSIG units are vented through a porous filter plug supplied on the
unit.

3.0 ELECTRICAL INSTALLATION

The Model DPT209 is available in four electrical terminations:

1. Two foot Cable

2. Packard Connector

3. Hirschmann Connector

4. Conduit Adapter, 1/2 inch

3.1 Voltage Output Units

black

The Model DPT209 voltage output is a 3-wire circuit. If the DPT209 is supplied with 2 feet of
cable, the electrical connection is as follows:

Red = + Excitation; connect to appropriate power supply
Green = + Output; connect to controls or monitor.
Black = Common; connect to return of power supply.
White = -Output; connect to controls or monitor.
Shielding = Connected to system or earth ground.

3.2 Current Output Units

The Model DPT209 (current output) transducer is a true 2-wire, 4-20 mA current output device and
delivers rated current into any external load of 0-800 ohms. The 4-20 mA current output units are
designed to have current flow in one direction only - PLEASE OBSERVE POLARITY. We suggest
that the electrical cable shield be connected to the system’s loop circuit ground to improve
electrical noise rejection. The electrical connection is as follows:

Model C209

Setra

Transmitter

(4-20 mA)

red +

Power Supply

The DPT209 has a 2-wiere cable, where red is positive and black is negative.

_ _

_

+

++

Load

(Monitor)

3.3 Hirschmann or Packard Connectors – Voltage and Current Output

If the unit is provided with a Hirschmann or a Packard Connector, pin number designation are as
follows:

Hirschmann Connector

Top View: Hirschmann Connector
Type: G4A1M#931807-106

Voltage Output Current Output

Pin # Function Pin # Function

1 + Excitation (connect to appropriate power supply 1 Positive
3 + Output (connect to controls or monitor 2 Negative
2 Common (connect to return of power supply)