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Copyright © Greystone Energy Systems Inc. All Rights Reserved

www.greystoneenergy.com

PS-GLFS1XXX-03

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

LIQUID FLOW SWITCH

GLFS-1 SERIES

PRODUCT DESCRIPTION

The Liquid Flow Switch is suitable for flow

monitoring and control of water and normal media

in industrial plants, heating, air conditioning, and

refrigeration systems. Enclosed in a water-proof IP65

enclosure, it includes multiple stainless steel paddle

sizes for pipes up to 203.2mm (8”) in diameter. The

switch is suitable for liquid temperatures up to

120°C (248°F) and a maximum working pressure of

up to 13.5 Bar (195.8 PSI).

LIQUID FLOW RATE

LINE PIPE SIZE (IN)

1

1 1/4" 1 1/2"

2

2 1/2"

3

4

4Z

5

5Z

6

6Z

8

8Z

MINIMUM FLOW

GPM (M3/H)

Flow increase

1 & 2 Connected

4.2

(1.0)

5.8

(1.3)

7.5

(1.7)

13.7

(3.1)

17.6

(4.0)

27.5

(6.2)

64.7

(14.7)

35.2

(8.0)

12.5

(28.4)

57.01

(12.9)

90.0

(43.1)

74.0

(16.8)

374.7

(85.1)

204.7

(46.5)

Flow Decrease

1 & 3 Connected

2.5

(0.6)

3.7

(0.8)

5.0

(1.1)

13.7

(2.2)

11.9

(2.7)

19

(4.3)

50.1

(11.4)

26.9

(6.1)

101.1

(22.9)

41.0

(9.3)

158.0

(35.9)

54.0

(12.3)

319.7

(72.6)

170.0

(38.6)

MAXIMUM FLOW

GPM (M3/H)

Flow Increase

1 & 2 Connected

9.2

(2.1)

13.3

(3.0)

17.6

(4.)

26.9

(6.1)

30.8

(7.0)

50.2

(11.4)

127.6

(29.0)

81.0

(18.4)

245.0

(55.6)

18.0

(18.4)

374.7

(85.1)

144.0

(32.7)

759.5

(172.5)

415.0

(94.2)

Flow Decrease

1 & 3 Connected

8.1

(1.9)

12.5

(2.8)

16.3

(3.7)

25.1

(5.7)

28.6

(6.5)

471

(10.7)

122.0

(27.7)

76.2

(17.3)

234.7

(53.3)

111.0

(25.2)

359.7

(81.7)

134.7

(30.6)

729.6

(165.7)

400.6

(90.8)

TYPICAL INSTALLATION

For complete installation and wiring details,

please refer to the product installation

instructions.

The flow switch can be installed in any position,

as far from elbows or obstructions as possible with

the arrow pointing in the direction of the flow. If the

pipe is vertical, recalibrate the range to balance the

paddle weight.

ORDERING INFORMATION

GLFS-1

PADDLE SIZES

PIPE

1”

1 1/4”

1 1/2”

2”

2 1/2”

3”

4”

4”Z

5”

5”Z

6”

6”Z

8”

8”Z

NUMBER

1

1

1

1, 2

1, 2

1, 2, 3

1, 2, 3

1, 2, 3, 4

1, 2, 3

1, 2, 3, 4 1, 2, 3

1, 2, 3, 4 1, 2, 3

1, 2, 3, 4

NOTE: Refer to dimensional drawings above for corresponding paddle numbers.

NOTE: For flow rates with suffix “Z”, the 6 inch paddle must be installed.

TYPE OF OPERATION

On/Off, single-stage, micro switch

OUTPUT

SPDT 15(8A) 24/250 Vac

FLOW RATES

See flow rate table

FLOW RATE SETTING ADJUSTMENT

Internal screw

SENSING ELEMENT

Paddle

TYPICAL LIQUID APPLICATIONS

Hot, chilled, well, pool, and sea water, brine or ethylene glycol

PROCESS CONNECTION

1”NPT

PARTS MATERIAL IN CONTACT WITH

FLUID

Brass

PADDLE MATERIAL

Stainless steel

LIQUID TEMPERATURE

-20 to 120°C (-4 to 248°F)

AMBIENT OPERATING RANGE

-40 to 85°C (-40 to 185°F), 10 to 90 %RH non-condensing

CABLE ENTRY

M18 fitting

ENCLOSURE

White ABS or PC, IP65 (NEMA 4X)

WEIGHT

1.0kg (2.2lbs)

SPECIFICATIONS

65 mm

2.56”

98 mm

3.85”

M18

29 mm

1.14”

1

2

3

4