G-9
FLOW SWITCHES
Visit www.GemsSensors.com for most current information.
Flow Settings
GPM
Part Numbers
Brass Stainless Steel
Normally Open @ No Flow Normally Closed @ No Flow Normally Open
0.10 70820 70826 26969
0.25 70821 70827 26970
0.50 70822 70828 26971
0.75 70823 70829 26972
1.00 70824 70830 26973
1.50 70825 70831 26974
2-3/4"
(69.9 mm)
1/4" NPT
1"
(25.4 mm)
OUT
1"
(25.4 mm)
1"
(25.4 mm)
IN
5/8"
(15.9 mm)
3/8"
(9.5 mm)
1/4" NPT
G-12a ill
4
2
1
3
0
0 0.5 1.0 1.5 2
FLOW RATE - GPM
PRESSURE DROP (PSID)
Part No. 70823
Part No. 70820
Tests conducted with units in vertical position (lead wires up) with water at
+70°F (21°C).
PISTON TYPE
FS-927 Series – Small Design
for Tight Instrumentation Packages
Flow Rate Settings: 0.10 GPM to 1.50 GPM
Port Size: 1/4˝ NPT
Primary Construction Material: Brass, Stainless Steel
Setting Type: Fixed
Measuring only 1˝ x 2-3/4˝, these compact switches are ideal for use where space
is at a premium. Designed for use with water and oil, these switches are suitable for
high volume OEM applications. They are ideal for coolant or lubricant flow monitoring
in portable equipment and many other applications with space constraints.
Specifications
Wetted Materials
Housing and Piston Brass, Stainless Steel
Spring 316 Stainless Steel
Other Wetted Parts Stainless Steel
Operating Pressure, Maximum 1000 PSIG (69 bar)
Operating Temperature -20°F to +200°F (-29°C to +93.3°C)
Set Point Accuracy ±15%
Set Point Differential 20% Maximum
Switch* SPST, 20 VA
Inlet/Outlet Ports 1/4˝ NPT
Electrical Termination No. 18 AWG, 24
˝
L., PVC Lead Wires
*See “Electrical Data” on Page X-5 for more information.
How To Order – Standard Models
Specify Part Number based on flow setting and switch operation.
Liquids other than water: Special calibration is available from Gems for media other
than water. Please consult factory with your requirements, including flow media,
operating pressure, flow set point and liquid viscosity (SSU).
Notes:
1. Flow settings are calibrated using water @ +70°F on increasing flow, with units in a vertical position
(lead wires up).
2. Care should be taken by specifiers to ensure fluid compatibility with the above listed wetted materials.
3. Use of 50 micron filtration is recommended.
– Stock Items.
U.L. Recognized —
File No. E31926
CSA Listed —
File No. LR30200
Dimensions
Pressure Drop – Typical
