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C A Briggs Company

The LevelWorks^® People

FS-550 Series
High Pressure, Metal Paddle Switch

	Engineered for Positive Liquid Flow Detection at Pressures to 2000 PSIG
	Unique, Patented Cam Design Assures Low Pressure Drop and Does not Require Bellows, Seals, or Mechanical Linkages
	Minimum In-Line Restriction; Paddle Pivots to Move Out of Liquid Path with Increasing Flow
	Pipe Line Size: 1 1/4" and up
	Primary Construction Material: Stainless Steel or Brass
	Setting Type: Fixed

Standard FS-550 switches sense liquid flow in either direction to monitor flow/no-flow conditions. They are supplied in two paddle lengths. The paddle is trimmed during installation to permit switch actuation at the desired flow rate. As flow increases in a pipe, the paddle of the switch pivots to move out of the liquid path, producing less than 3 PSIG of pressure drop regardless of pipe size.

Typical Applications:

	Compressors
	Heat Exchangers
	Turbines
	Engine
	Boilers
	Chillers
	Valves
	Pumps
	Regulators

Specifications:

Wetted Materials
- Housing	Brass or 316 Stainless Steel
- Paddle	302 Stainless Steel
- Spring	316 Stainless Steel
- Other Wetted Parts	Ceramic and Teflon®
Operating Pressure, Maximum	2000 PSIG
Pressure Drop	3 PSIG Maximum
Operating Temperature	-30°F to + 300°F (-34.4°C to + 148.9°C)
Set Point Accuracy	± 25%
Switch	SPDT, 20 VA
Repeatability	± 5%
Electrical Termination	No. 18 AWG, 24" L., Polymeric Lead Wires

How To Order:
Simply select the part number in the chart below. Then call the C A Briggs Company.

Switch Type	Paddle Length	Housing Material	Switch Operations	Part Numbers
Switch Type	Paddle Length	Housing Material	Switch Operations	Standard	3-Pin J-Box
SPDT Standard Unit	Long	Brass	N.O. or N.C.	29609	56730
SPDT Standard Unit	Long	316 S.S	N.O. or N.C.	29608	56729
SPDT Standard Unit	Short	Brass	N.O. or N.C.	30641	66914
SPDT Standard Unit	Short	316 S.S	N.O. or N.C.	30640	61189

Stock items
The FS-550 Switch is not recommended for use with 1" plastic tees.

FS-550 Series Flow Switches are U. L. Approved for Class I, Division 2, Groups A, B, C, D hazardous areas.
They are also available as FM-approved when used with GEMS Junction Boxes which are explosion-proof for Class I, Division 1, Groups B, C, D, E, F, G hazardous locations.

Using GEMS SAFE-PAK Relays and Barriers, these switches provide automatic flow/no flow interlock and are intrinsically-safe without explosion-proof housing and piping.

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