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www.greystoneenergy.com

PS-DPFSXXX-02

Greystone Energy Systems, Inc.

150 English Drive, Moncton,

New Brunswick, Canada E1E 4G7

Ph: +1 (506) 853-3057 Fax: +1(506) 853-6014

North America: 1-800-561-5611

E-mail: mail@greystoneenergy.com

DIFFERENTIAL PRESSURE FLOW SENSOR

DPFS SERIES

PRODUCT DESCRIPTION

The DPFS sensors are designed to sense differential

pressure in the inlet section of VAV (Variable Air

Volume) terminal units and fan terminal units. They

can also be used to sense differential pressure at

other locations in the main or branch duct systems.

The differential pressure read between the high “H”

port and the low “L” port can be used to determine

the air flow. Models offer up to nine sensing points

and sensing lengths of 8.02 to 55.01 cm (3-5/32 to

21-21/32”) to accommodate box size diameters of

10 to 76 cm (4 to 30”).

TYPICAL INSTALLATION

For complete installation and wiring details, please refer to the product installation instructions.

1.

Install the unit horizontally to assure accurate velocity readings for units ranging from 8.02 to 25.26 cm (3-5/32˝ to 9-29/32˝). If using a unit longer than the

DPFS5, which is 25.26 cm (9-29/32˝), vertical mounting is recommended.

2.

Determine the duct’s flow direction and install the Series DPFS based on the unit’s flow arrow imprint.

3.

Cut a 2.25 cm (7/8˝) hole in the ducting to accept the unit.

4.

Attach using two self-tapping screws inserted in the 4.75 mm (3/16˝) mounting holes.

The Series DPFS utilizes 6.35 mm (1/4˝) ID, 9.5 mm (3/8˝) OD tubing. First check that there are no sharp bends in the tubing at any connection. Bends and creases

may leak overtime as the tubing ages. Connect the “H” Port to the high input on the differential pressure gage, transmitter,or switch. Connect the “L” Port to the

low input on the differential pressure gage, transmitter,or switch. It may be necessary to calibrate in order to insure an accurate measurement. You can do this by

completing a traverse of the duct or fan to determine the delta P sensed by the DPFS vs. the actual flow.

MATERIAL

Light grey ABS/Polycarbonate, UL94-5V

MOUNTING

Integral flange with gasket

CONNECTION

6.35 mm (0/4”) nipple for 9.5 mm (3/8”) OD polyethylene tubing

OPERATING TEMPERATURE

4 to 49°C (40 to 120°F)

WEIGHT

28 grams (1 oz)

12” up - Welded Construction

APPROVALS

RoHS compliant

PROBE DIAMETER

6 mm (0.236”)

COUNTRY OF ORIGIN

Canada

SPECIFICATIONS

PRODUCT

DPFS

Differential Pressure Flow Sensor

SENSOR

2

4

5

6

7

8

9

10

8.02 cm (3-5/32”)

19.55 cm (7-21/32”)

25.26 cm (9-29/32”)

31.75 cm (12-1/2”)

37.47 cm (14-3/4”)

43.50 cm (17-1/8”)

49.29 cm (19-13/32”)

55.01 cm (21-21/32”)

ORDERING

DPFS

PART NUMBER

NOTE: Greystone Energy Systems, Inc. reserves the right to make design modifications without prior notice.

57.15 mm

1.25”

88.9 mm

3.5”

69.85 mm

2.75”

11.11 mm

0.4375”

Puch-on connections for 9.53 mm

(3/8”) OD poly tubing

Various Probe Lengths

See Ordering Chart

Foam Gasket 6.35 mm (1.4”) thick

Mounting Holes

2X ø 3/16 [ø4.76]