Gems Sensors & Controls FS-500 Specifications
FLOW SWITCHES
BONNET AND
SHUTTLE LIFT
OUT OF HOUSING
BONNET IS
RELEASED
WITH A
COUNTERCLOCKWISE
TWIST
HOUSING STAYS
IN PIPING
SYSTEM
8
1.48"
(37.5mm)
1.8"
(45mm)
3.80"
(96.5mm)
BONNET
HOUSING
2.00"
(50.8mm)
1.32"
(33.5mm)
10
2
1
0
0 64 14 1682 12 18 20 22 24
4
3
5
FLOW RATE - GPM
Tests conducted with units in vertical position (lead wires up) with
water at +70°F (21°C).
PRESSURE DROP (PSID)
Part No. 170235
Part No. 170231
FS-500 Series – Low Cost Units for
Threaded Plastic Piping
Flow Rate Settings: 0.25 GPM to 5.0 GPM
Port Size: 3/4˝ NPT
Primary Construction Material: Polypropylene
Setting Type: Fixed
The FS-500 offers low cost flow monitoring with a variety of switch actuation points
and low pressure drop. All wetted parts are polypropylene or stainless steel, making this
switch ideal for a wide range of chemical and temperature requirements. The materials
are also NSF or FDA approved for potable water treatment applications including
chlorinators, purifiers and heaters. The FS-500 is ideal for equipment cooling
including welders, lasers, etc. A J-box version with a 5 amp relay is also available for
direct control of higher electrical loads, such as chlorinator pumps.
Specifications
Wetted Materials*
Housing, Bonnet, Shuttle, Shuttle Cap Polypropylene, Hydrolytically Stable
O-Ring Viton® or Buna N
Spring 316 Stainless Steel
Retaining Clip PH 15-7 Mo Stainless Steel
Operating Pressure, Maximum 100 PSIG (6.9 bar) @ +70°F (21°C)
50 PSIG (3.4 bar) @ +180°F (82°C)
40 PSIG (2.8 bar) @ + 212°F (100°C)
Operating Temperature, Maximum 0° to 212°F (100°C)
Set Point Accuracy ± 20%
Set Point Differential ± 20% Maximum
Switch** SPST, N.O. Pilot Duty 20 VA, 120-240 VAC or VDC
J-Box with 5A Relay
Coil 120 VAC 50/60 Hz
Contacts SPDT 5A – 240 VAC Res
1/3 HP – 120 VAC
5A – 28 VDC Res.
Inlet/Outlet Ports 3/4˝ Female NPT
Electric Termination
Pilot No. 22 AWG, 24˝ Zip Cord Lead Wires
J-Box 6´ PVC Cable
* Materials of Construction are available for FDA or NSF Compliance.
** See “Electrical Data” on Page X-5 for more information.
File No. E31926
FS-500
Series
Dimensions
J-Box with
5-Amp Relay
How To Order – Standard Models
Specify Part Number based on switch actuation set point. Set points other than
those listed are available as special order; contact GEMS with your requirements.
Normally closed switch logic units available as special orders.
Switch Actuation
Set Point
GPM
0.25
G-22
0.50
1.00
2.00
2.50
5.00
Note: Use of 100 micron filtration is recommended.
– Stock Items.
Pilot Duty J-Box w/5A Relay
170231 175901
170232 175902
170233 —
175117 —
170234 —
170235 —
Part Numbers
Pressure Drop - Typical
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