FLOW SWITCHES
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F-4
FLOW SWITCHES
F-5
Switch Actuation
Set Point for
Liquids (GPM)
Part Numbers
for Liquids
Switch Actuation Set Point
for Gases
Part Numbers
for Gases
5 PSI
100 PSI
0.05
165840
25 CFH
60 SCFH
165840-Air
0.25
165841
1 CFM
2.6 CFM
165841-Air
0.50
165842
2.5 CFM
5.6 CFM
165842-Air
1.00
165843
5 CFM
12 CFM
165843-Air
P (PSI)
FLOW RATE (GPM, WATER)
2
1.5
1
0.5
0
21.510.50
1.00˝
(25.4 mm)
.775˝
(19.7 mm)
4.10˝
(104 mm)
1/4˝ MNPT
PORTS (2)
FS-3 Series – Compact, Low Flow Units
for Clean Potable Water Applications
Flow Rate Settings:
Liquids:
0.05 GPM to 1.00 GPM
Gases:
25 CFH to 12 CFM
Port Size:
1/4˝ Male NPT
Primary Construction Material:
Noryl
®
Setting Type:
Fixed
These ultra compact switches have been speci cally designed for reliable operation
in clean post- ltered water. They are made primarily of Noryl
®
, with all other wetted
materials also FDA or NSF compliant. FS-3 switches are instrument-quality, yet
affordably priced for pure water equipment...from U.V. Lamp switching to Filter Life
Monitoring.
Speci cations
Wetted Materials*
Housing and Barbs
Noryl
®
Piston
Noryl
®
and Epoxy
Spring and Stop Pin
316 Stainless Steel
Pressure Rating
150 PSI @ 70°F; 50 PSI @ 212°F
Operating Temperature
0°F to 212°F (100°C), Max.
Required Filtration
50 Micron or Better
Switch**
SPST, N.O.
†
Pilot Duty 20 VA, 120-240 VAC or VDC
Electrical Termination
No. 22 AWG, 18˝ L., PVC Lead Wires
*
Materials of construction are either FDA or NSF compliant.
**
See “Electrical Data” on Page X-5 for more information.
†
N.O. switches in No Flow condition are standard.
Pressure Drop Data
Typical
P vs Flow Rate
How To Order
Specify the FS-3 Flow Switch using part numbers tabulated below. Set points other
than those listed are available as special order; contact GEMS with your requirements.
Notes:
1.
This device is designed to provide Flow/No Flow sensing. Tabulated set points specify maximum contact
closure thresholds on increasing uid ow. Re-establishment of a Normally Open contact occurs on
decreasing uid ow by 0 GPM.
2.
Flow settings are based on a vertical position (inlet port down), using water (for liquids) or air (for gases) at
+70°F on increasing ow. Some variation in set point actuation will occur with other gases or liquids, and
in other mounting orientations.
3.
Use of 50 micron, or better, ltration is required.
– Stock Items.
U.L. RECOGNIZED —
FILE NO. E31926
Dimensions
Other port sizes available; please call factory.
Special Requirements.
GEMS caters to OEM needs with special con gurations,
including Gas (Air) ow, and customer speci ed
electrical terminations.
