User manual | Catalogo interruptores-de

INTRODUCTION
Flow Switches
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Contents
Page Start
Thermal Dispersion Type................................... G-2
Thermal Dispersion
Piston
Shuttle
Paddle
Piston Type................................................................. G-4
Shuttle Type............................................................. G-18
Unique Designs . . . For Use in Liquids or Gases
GEMS’ line of flow switches features a broad range of configurations for
use in liquids or gases. At preset rates, ranging from 50 cc/min. to
100 GPM, GEMS switches will initiate alarm actuation or automatic
shut-down of a system.
Paddle Type............................................................. G-25
Thermal Dispersion Types
These switches feature high quality, corrosion-resistant materials for
use in the toughest environments. Material choices, ranging from
stainless steel to Ryton®, offer vast chemical compatibility. Versions
include switches with fixed or adjustable actuation settings, models for
viscosity compensation or high pressures, in-line models and designs
to satisfy any mounting or space requirement.
Variety of Operating Principles
The versatile GEMS Flow Switch line utilizes four basic operating
principles. This catalog is organized into four operational types: Piston,
Shuttle, Paddle and Electronic. The Shuttle models are for use with high
flow rates; the Piston types are designed for low flow rates; the Paddle
for large line sizes and the Electronic switches encompass state-of-theart electronics and positive visual indication.
Piston Types
Set Point
Water
Air
Switch
Series
50 cc to 300 cc/min.
2 to 50 SCFH
FS-926
0.1 to 1.0 GPM (oil)
—
FS-930
0.1 to 1.5 GPM
—
FS-4
0.1 to 1.5 GPM
0.5 to 25.0 SCFM
Body
Materials
Alloys
Engineered Plastics
FS-925
FS-927
FLOW SWITCHES
Flow Rate Selection Guide
Shuttle Types
Alloys
0.1 to 1.5 GPM
—
0.1 to 11 GPM
—
FS-600
0.1 to 60 GPM
—
RFS-2500 Rotorflow1
Eng. Plastics & Alloys
0.15 to 2.0 GPM
—
FS-380
Alloys
0.25 to 2.0 GPM
—
FS-380P
0.25 to 5.0 GPM
—
FS-500
0.5 to 3.0 GPM
—
FS-480
0.5 to 5.0 GPM
—
FS-150
0.5 or 2 GPM
—
FS-400P
0.5 to 20.0 GPM
1.0 to 160.0 SCFM
FS-10798
0.5 to 100 GPM
—
FS-200
0.75 to 10.0 GPM
—
FS-400
0.75 to 14.0 GPM
—
FS-400 Adjustable
1.0 to 15.0 GPM
—
FS-200 Adjustable
Dependent on Pipe Size
and Paddle Length
—
FS-550 Series
Engineered Plastics
Alloys
Engineered Plastics
Paddle Types
Alloys
Note:
1. See Section E.
Visit www.GemsSensors.com for most current information.
G-1
FS-600 Series – No Moving Part, Thermal
Dispersion Flow Switch
Flow Rate Settings: 0.1 GPM to 11 GPM (0.5 LPM to 41 LPM)
Port Size: 1/2˝ to 1-1/2˝ (NPT or G thread)
Ro H S
G
EM
®
S CO PLIAN
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Ro H S
G
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S CO PLIAN
M
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Setting Type: Fixed
The FS-600 series uses proven thermal dispersion technology to provide a robust no
moving part flow switch even without filtration. The solid state sensor is compatible
with both conductive and non-conductive fluids. Suitable for fluids with particulates or
slurries, and is immune to changes in media viscosity. The straight through switch is
designed for a long life and can be mounted in any orientation and can handle a wide
range of flow rates. No moving parts means years of reliable service.
Specifications
FLOW SWITCHES
Wetted Materials
Probe
Flow Body
Operating Pressure (Max.)
Operating Temperature
Power on Delay Time
Response Time
Inlet/Outlet Ports
Operating Voltage
Current Consumption
Switch Contact Rating
Switch Logic
Ingress Protection
Set point Accuracy
Set point Differential
Electrical Termination
Approvals
303 Stainless Steel
316 Stainless Steel
363 PSIG (25 bar)
-14° F to 140°F (-10°C to 60°C)
15 Seconds Max (Output On)
10 Seconds Max.
1/2˝, 3/4˝, 1˝, 1-1/2˝ NPT
1/2˝, 3/4˝, 1˝, 1-1/2˝ G Internal
24 Vdc or 24Vac +/- 15%
Less than 50mA
[email protected], 42Vdc @65mA
Normally Open
IP65
15%
20% (Max.)
M12 x 1 (4-Pin) (1 meter cable included)
CE, RoHS
Dimensions
3˝
(76 mm)
LABEL
ØC
B
NPTF
2 PLACES
D
A
SENSING ELEMENT
Calorimetric Principle/Thermal Dispersion
The operating principle of the FS-600 flow switch is based on the calorimetric
principle. The FS-600 uses the cooling effect of a flowing fluid or gas to monitor the
flow rate. The amount of thermal energy that is removed from the tip determines the
local flow rate. This temperature-based operating principle can reliably sense the flow
of virtually any liquid or gas.
The sensor tip of the FS-600 flow sensor houses two transistors and a heater element.
One transistor is located in the sensor tip, closest to the flowing fluid. This transistor
is used to detect changes in the flow velocity of the liquid. The second transistor is
bonded to the cylindrical wall and is a reference for ambient fluid conditions.
In order to make the sensor sense flow, it is necessary to heat one of the transistors
in the probe. When power is applied, the tip of the probe is heated. As the fluid starts
to flow, heat will be carried away from the sensor tip. Cooling of the first transistor
is a function of how fast heat is conducted away by the flowing liquid. The difference
in temperature between the two transistors provides a measurement of fluid velocity
past the sensor probe. When fluid velocity is high, the temperature differential is
small. As fluid velocity decreases, there is an increase in temperature differential.
Port Size
NPTF
A
B
C
D
1/2˝
1.13
(28.7)
2.65
(67.3)
0.62
(15.8)
3.06
(77.8)
3/4˝
1.50
(38.1)
2.75
(69.9)
0.824
(20.9)
4.00
(101.6)
1˝
1.50
(38.1)
2.75
(69.9)
1.05
(26.7)
4.00
(101.6)
1-1/2˝
2.25
(57.1)
3.00
(76.2)
1.61
(40.9)
4.25
(107.9)
Notes:
1. Standard calibration is in water with units in a horizontal position.
2. Consult Gems for special applications.
Wiring Diagram
Pin 1 (V+) - red
Pin 2 (switch) - green
Pin 4 (switch) - yellow
Pin 3 (V-) - blue
G-2
Visit www.GemsSensors.com for most current information.
THERMAL DISPERSION TYPE
1.2
230500-1-5
0.64
2.20
230500-3-5
0.24
0.90
230500-1-10
0.97
3.20
230500-3-10
0.35
1.31
230500-1-15
1.31
4.25
230500-3-15
0.46
1.73
230500-1-20
1.65
5.30
230500-3-20
0.57
2.14
230500-1-25
1.99
6.5
230500-3-25
0.68
2.56
230500-1-30
2.32
7.5
230500-3-30
0.79
2.98
230500-1-35
2.66
8.5
230500-3-35
0.90
3.39
230500-1-40
3.00
9.5
230500-3-40
1.01
3.81
230500-1-45
3.33
10.0
230500-3-45
1.12
4.23
230500-1-50
3.67
12.0
230500-3-50
1.23
4.64
230500-1-55
4.01
13.0
230500-3-55
1.34
5.06
230500-1-60
4.34
14.0
230500-3-60
0.35
1.31
230500-2-5
1.48
5.50
230500-4-5
0.57
2.15
230500-2-10
2.28
8.5
230500-4-10
0.79
2.99
230500-2-15
3.07
11.6
230500-4-15
1.01
3.83
230500-2-20
3.86
14.6
230500-4-20
1.23
4.67
230500-2-25
4.66
17.6
230500-4-25
1.46
5.51
230500-2-30
5.45
20.6
230500-4-30
1.68
6.00
230500-2-35
6.0
22.7
230500-4-35
1.90
7.00
230500-2-40
7.0
26.5
230500-4-40
2.12
8.00
230500-2-45
8.0
30.3
230500-4-45
2.34
9.00
230500-2-50
9.0
34.1
230500-4-50
2.57
10.00
230500-2-55
10.0
37.9
230500-4-55
2.79
11.00
230500-2-60
1-1/2˝
11.0
41.6
230500-4-60
FLOW RATE (GPM)
0.48
6
1.4
5
4
1
0.8
3
0.6
2
0.4
1
0.2
0
0
0
10
20
30
40
50
FLUID VELOCITY (cm/s)
60
70
3/4˝ NPT and 1˝ NPT Ports (3/4˝ and 1˝ G Ports)
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
16
14
12
10
1˝ NPT
8
6
3/4˝ NPT
4
2
0
0
10
20
30
40
50
FLUID VELOCITY (cm/s)
60
70
1-1/2˝ NPT Ports (1-1/2˝ G Ports)
12
45
40
10
35
8
30
25
6
20
4
15
10
2
Notes:
1. Setpoints based on water flow. Contact factory for setpoints of alternate media.
2. G threads are available upon request. Minimum order quantities apply. Contact factory.
3. -5 through -60 = fluid velocity (cm/s)
FLOW RATE (LPM)
1.6
FLOW SWITCHES
3/4˝
Part Numbers
0.13
1˝
1/2˝ NPT Ports (1/2˝ G Port)
FLOW RATE (GPM)
1/2˝
Part Numbers
Port Size Flow Setting
NPT
GPM LPM
FLOW RATE (GPM)
Port Size Flow Setting
NPT
GPM LPM
FLOW RATE (LPM)
Specify Part Number based on water flow rates for the FS-600 Series per the
following chart.
Fluid Velocity vs. Flow Rate
in GPM/LPM in Water
FLOW RATE (LPM)
How To Order – Standard Models
5
0
0
0
10
20
30
40
50
FLUID VELOCITY (cm/s)
60
70
Accessories
Description
Part#
M12 cord Set-1 meter (Red 1, Green 2, Blue 3, Yellow 4) 22 AWG
557703-01M0
M12 cord Set-3 meter (Red 1, Green 2, Blue 3, Yellow 4) 22 AWG
557703-03M0
M12 cord Set-4 meter (Red 1, Green 2, Blue 3, Yellow 4) 22 AWG
557703-04M0
M12 cord Set-5 meter (Red 1, Green 2, Blue 3, Yellow 4) 22 AWG
557703-05M0
Visit www.GemsSensors.com for most current information.
G-3
Piston Type Switches – For Low Flow
Rates in Liquids and Gases
 Models for liquid flow rates as low as 50 cc/min. and gas flow rates
as low as 2 SCFH
 Small, compact housings with port sizes from 1/4˝ NPT
 Precision built for superior accuracy
Typical Applications
Protect your expensive electronic equipment from coolant flow failure on...
• Laser Heads • Welders • Power Supplies • High Speed Spindles • X-Ray Tubes
• Semiconductor Equipment
Assure proper lubrication flow to critical bearings or gears to prevent system
downtime on...
• Presses • Rotating Equipment • Conveyors • Machine Tools • Robotics
Ensure system integrity in processing and dispensing equipment on...
• Water Purifications and Filtering • X-Ray film Processing
• Beverage dispensing • Chemical additives • Gas sampling • Distilling
Design Data
General Operating PrinciplesLow-Flow Switches
Partial Cutaway
(FS-926)
24" (609.6 mm)
WIRE LEADS
NO. 18 AWG
O-RING
MAGNET CARRIER
PISTON
O-RING
POLYSULFONE
HOUSING
SPRING
PERMANENT
MAGNET
FLOW SWITCHES
BY-PASS
HOLES
METERING
ORIFICE
LOW-FLOW
PISTON
HERMATICALLY
SEALED SWITCH
PISTON
HOUSING
9/16" -18 UNF-2B
BOTH PORTS
O-RING
INLET
FITTING
(FS-4 and FS-925
Series shown)
A piston, encapsulating a permanent magnet, is
positioned in the flow path within the unit housing. When
displaced by the pressure differential from fluid flow, this
piston magnetically actuates a hermetically sealed reed
switch (SPST or SPDT, depending on the series) within
the unit. The piston metering land diameter precisely
sets the actuation point by regulating bypass clearance.
A stainless steel spring provides positive piston return as
flow decreases. The reed switch, when actuated, can be
used to operate remote alarms or indicators. Or, it may be
integrated into automatic system controls.
G-4
An additional, lap-fitting piston is used in GEMS FS-926
Series to accurately detect low-flow rates. Calibration
is determined by one or more metering holes in the top
of the low-flow piston, which regulates bypass flow,
and therefore the actuation setting. When metered
bypass flow is exceeded, the resultant pressure
differential displaces the low-flow piston, moving the
magnet carrier piston to actuate the reed switch. Two
large bypass holes in the piston skirt are exposed after
actuation to maintain low pressure drop.
Externally Adjustable Switches
W
H-FLO
SWITC
MAX
IN
The
OUT
MIN
FS-10798
Series offers
FLOW ACTUATION
infinite flow
ADJUSTMENT
settings
from 0.5 to 20 GPM. Versions suitable for gas flow
monitoring are also available.
Visit www.GemsSensors.com for most current information.
P/N
MFRS.
S/N
MFRS.
TYPE NO.
NO.
CONTR.
NO.
STOCK
SPEC.
PISTON TYPE
Viscosity Compensating Switches
Contents
Page Start
FS-4 Series
Molded Plastic Construction...................... G-6
O-RING
FS-150 Series
Straight-Through Flow Path,
Ryton Material.................................................... G-7
Partial Cutaway
(FS-930 Series)
VISCOSITY
COMPENSATING PISTON
FS-380 Series
High Pressure Inline........................................ G-8
When temperatures of viscous fluids change, so do their flow properties. With
viscosity lowered by increasing temperature, a greater flow is generally required to
create actuation pressure differential. A unique patented piston within GEMS FS-930
Series switches accommodates these changes in fluid viscosity while maintaining
accurate switch actuation. Units can detect flow rates with 20% accuracy for liquid
viscosities between 40 to 1000 SSU.
FS-380P Series
Inline – Plastic Flow......................................... G-9
FS-480 Series
Low Pressure Drop......................................... G-10
Low Pressure Drop Switches
FS-927 Series
Miniature Brass Switches........................... G-11
ENCAPSULATED
REED SWITCH
FS-925 Series
General Purpose.............................................. G-12
OVER-MOLDED PISTON
WITH MAGNET
FS-10798 Series
Externally Adjustable................................... G-14
METERING DISC
O-RING
FLOW SWITCHES
SPRING
FS-926 Series
Low Flow............................................................. G-12
FS-930 Series
Viscosity Compensating.............................. G-16
The key to the excellent flow qualities of the FS-150 and FS-380 Series switches
is the dual diameter internal bore. At flow rates below the actuation point, the fluid
passes around the piston and metering disc within the “metering bore.” As fluid flow
increases past the actuation point, the metering disc enters the “flow bypass bore”
where the increased diameter provides generous flow paths. The result is a low
pressure drop for high flow rates and less susceptibility to fouling.
Typical Piston and Spring Removal
PISTON
PISTON
SPRING
INLET
FITTING
PLUG
O-RING
SPRING
Accumulation of foreign debris should periodically be removed from these switches.
GEMS’ designs provide for easy piston and spring removal for this occasional
cleaning. Recommended cleaning procedures are provided in the Instruction Bulletin
shipped with each unit. 150 micron filtration is recommended for the FS-150 Series;
100 micron for FS-380, 50 micron filtration is recommended for all other piston type
switches.
NOTE: All air/gas Flow Switches are factory calibrated using a special piston. Water calibrated units are not
recommended for air/gas applications.
Visit www.GemsSensors.com for most current information.
G-5
FS-4 Series –
Low Cost, Molded Plastic Construction
Flow Rate Settings: 0.1 GPM to 1.5 GPM
Port Size: 9/16˝-18 UNF
Primary Construction Material: Ryton®
Setting Type: Fixed
Ro H S
G
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S CO PLIAN
M
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Ro H S
G
The FS-4 Series makes flow protection economical for a broad range of industrial
applications such as welders, lubrication systems, medical sterilizers and laundry
chemicals dispensing.
EM
®
S CO PLIAN
M
T
U.L. Recognized —
File No. E31926
CSA Listed —
File No. LR30200
Specifications
Wetted Materials
Housing and Piston
Ryton® R4
Spring
316 Stainless Steel
O-Ring
Viton®
Other Wetted Parts
Dimensions
Epoxy
1.90
48
Operating Pressure, Maximum
250 PSIG (17.2 bar) @ 70°F (21°C)
Operating Temperature
0°F to 225°F (-17°C to +107°C)
Set Point Accuracy
±15% Maximum
Set Point Differential
20% Maximum
Switch*
SPST or SPDT, 20 VA (SPDT: 240 VAC Max.)
Inlet/Outlet Ports
9/16˝ -18 UNF-2B Thread
Recommended Filtration
Electrical Termination
SPST
50 Microns or Better
.920 DIA
23
.586
15
1.00
25
LEADWIRES
18 AWG, Zipcord, 24˝ Long
SPDT
3.80
97
18 AWG, PVC 24˝ Long Leads
3.640
92
1.255
32
How To Order – Standard Models
Housing
and Piston
Material
Ryton
®
Flow
Setting
GPM
Part Numbers
SPST Switch
N.O., No Flow
N.C., No Flow
With
SPDT Switch
0.1
122340
122346
122352
0.25
122341
122347
122353
0.5
122342
122348
122354
0.75
122343
122349
122355
1.0
122344
122350
122356
1.5
122345
122351
122357
Note:
Flow settings are calibrated using water @ +70°F on increasing flow, with units in a vertical position
(lead wires up).
inch
mm
9/16˝ -18 UNF-2B THREAD
WITH O RING SEAL PORT
Pressure Drop – Typical
3.0
PRESSURE DROP (PSID)
FLOW SWITCHES
* See “Electrical Data” on Page X-5 for more information.
2.5
Part No. 122355
2.0
Part No. 122357
1.5
Part No. 122352
1.0
0.5
0
0
0.5
1.0
1.5
2.0
FLOW RATE - GPM
Tests conducted with units in vertical position (lead wires up) with water
at +70 F (21 C).
Port Adapters for FS-4
Converts 9/16˝ threaded ports to NPT or barbed connection. Made of Ryton®-R4 or
polypropylene with O-Rings in place.
CAUTION: Do not exceed 15 in./lbs. maximum torque when installing adapter fittings.
Material
Ryton®
Polypropylene
G-6
Adapter Size
Part Numbers
1/8˝ NPT*
123028
1/4˝ NPT*
123029
1/4˝ NPT*
158602
1/2˝ Barb**
158603
*Wrench flats provide for proper assembly.
**Accepts 1/2˝ I.D. flexible hose
­– Stock Items.
1/2˝ (12.7 mm) .54˝ (13.7 mm)
DIA.
DIA.
3/4˝ (19.0 mm)
HEX
.25˝
(6.3 mm)
1/2˝ Barb
1˝
(25.4 mm)
1/4˝ NPT
1/8˝ NPT
3/4˝ (19.0 mm) DIA.
.62 FLAT
3/8˝ (9.5 mm)
1/2˝ (12.7 mm)
Visit www.GemsSensors.com for most current information.
1˝ (25.4 mm)
DIA.
.87 FLAT
1/2˝
(12.7 mm)
5/8˝
(15.9 mm)
PISTON TYPE
FS-150 Series – Straight Flow Path with
Low Pressure Drop
Flow Rate Settings: Liquids: 0.5 GPM to 5 GPM
Port Size: 1/2˝ NPT
Primary Construction Material: Polypropylene
Setting Type: Fixed
These slim, inline switches reduce pressure drop to a minimum. They incorporate
a unique, dual-diameter, internal bore and piston configuration to minimize flow
constriction. Liquids are able to smoothly pass around the piston and flow through
the switch with little pressure loss to the down stream line.
U.L. RECOGNIZED —
FILE NO. E31926
CSA Listed —
File No. LR30200
Specifications
G
EM
®
S CO PLIAN
M
T
Ro H S
G
EM
®
S CO PLIAN
M
T
Polypropylene, Hydrolytically Stable, Glass Reinforced
Piston
Ryton® -R4, 316 Stainless Steel
O-Ring
Viton®
Spring
316 Stainless Steel
Dimensions
Operating Pressure, Maximum
200 PSIG (13.8 bar) 
@+70°F to +150°F (+21.1°C to 65.5°C)
150 PSIG (10.3 bar)
@+150°F to +212°F (+65.5°C to +100°C)
Operating Temperature
0°F to 212°F (-17.8°C to +100°C)
Set Point Accuracy
±15% 
1-1/16"
(26.9 mm)
HEX
1/2" NPT
1/4" (6.3 mm)
QUICK CONNECT
TERMINALS
Set Point Differential
20% Maximum
Switch*
SPST, 20 VA
Inlet/Outlet Ports
1/2˝ NPT Male
Electrical Termination
1/4˝ Male Quick Connect Terminals (2)
7/8"
(22.2 mm)
DIA. REF.
5-29/32"
(139.7 mm)
REF.
*See “Electrical Data” on Page X-5 for more information.
How To Order – Standard Models
1/2" NPT
Specify Part Number based on flow setting and switch operation.
1-3/8"
(34.9 mm) REF.
2-5/32"
(54.8 mm) REF.
Part Numbers
Flow Settings
GPM
Normally Open @ No Flow
Normally Closed @ No Flow
0.5
129660
129666
1.0
129661
129667
2.0
129662
129668
3.0
129663
129669
4.0
129664
129670
5.0
129665
129671
1-13/64"
(30.5 mm) REF.
1-5/16"
(33.3 mm)
HEX
Note: Cable output available. Please consult factory.
Pressure Drop - Typical
5
PRESSURE DROP (PSID)
Notes:
1. Flow settings are calibrated using water @ +70°F on increasing flow, with units in a horizontal position
(terminals up).
2. Care should be taken by specifiers to ensure fluid compatibility with the above listed wetted materials.
3. Use of 150 micron filtration is recommended.
­– Stock Items.
Ro H S
FLOW SWITCHES
Wetted Materials
Housing
Patent #
4.996.396
4
Part No.
129663
3
Part No.
129664
2
Part No.
129665
Part No. 129660
Part No. 129661
Part No. 129662
1
0
3
4
5
6
7
FLOW RATE - GPM
Tests conducted with units in a horizontal position with water at +70°F (21°C).
Data will vary slightly for vertically mounted units.
0
Visit www.GemsSensors.com for most current information.
1
2
G-7
FS-380 Series – Compact Flow Switch
for High Inline Pressures
Flow Rate Settings: 0.15 GPM to 2.00 GPM
Port Size: Multiple
Primary Construction Material: Brass or Stainless Steel
Setting Type: Fixed
These rugged inline flow switches require 100 micron filtration and are less
susceptible to clogging than other high-pressure inline flow switches. The onepiece magnetic PPS composite piston makes the FS-380 ideal for high-pressure
applications such as industrial cleaning equipment. The FS-380 is also an excellent
choice for semicon cooling applications where simple design and reliable operation
are required.
Specifications
U.L. Recognized
File No. E31926
G
EM
®
S CO PLIAN
M
T
Ro H S
Dimensions
G
Brass or 316 Stainless Steel
Piston
PPS Composite, Epoxy
Spring
316 Stainless Steel
O-Ring
Fluorocarbon
FLOW
1.16
(29.5)
2 PLCS
0.518
(13.1)
Operating Temperature
-20°F to +275°F (-28.8°C to +135°C)
Set Point Accuracy
±20% Maximum
Set Point Differential
20% Maximum
Switch*
SPST, 20VA, N.O. at no Flow
Electrical Termination
No. 22 AWG, 24˝ to 26˝ Polymeric leads
T
1.13
(29)
Gems FS-380
1500 PSI (107 bar); 500 PSI (34 bar) for 1/2˝ Barb Models
®
S CO PLIAN
M
24˝-26˝
LEAD WIRES
0.605
(15.4)
Operating Pressure, Maximum
EM
inch
(mm)
1/2˝ Hose Barb Fitting
Wetted Materials
Housing
0.836
(21.2)
3/4˝ A/F HEX
4.63
(117.6)
3/8˝ Tube End Compression Fitting
24˝-26˝
LEAD WIRES
1.13
(29)
FLOW
*See “Electrical Data” on Page X-5 for more information.
1/2˝ NPT Ports
To prevent sensor to sensor magnetic field interference, follow the spacing
guidelines below.
1 1/4˝
2 3/8˝
0.86
(22)
24˝-26˝
LEAD WIRES
1.25
(32)
Gems FS-380
1 1/2˝
FLOW
2 13/64˝
FLOW
7/8˝ HEX
4.0
(102)
Gems FS-380
FLOW
Gems FS-380
FLOW
Gems FS-380
FLOW SWITCHES
Spacing
11/16˝ HEX
4.02
(102)
3/8˝ NPT Ports
FLOW
Gems FS-380
NOTE SWITCH
ORIENTATION
24˝-26˝
LEAD WIRES
Gems FS-380
1.00
(25)
FLOW
How To Order – Standard Models
3/4˝ HEX
3.45
(88)
Specify Part Number based on flow settings.
Flow
Brass
Settings
GPM1 1/2˝ NPT Male 3/8˝ NPT Male 3/8˝ NPT Male
Stainless Steel
0.85
(22)
Pressure Drop – Typical
3/8˝ Compression
1/2˝ Barb
14
—
181130
193482
212136
239693
12
0.25
192562
168432
179992
177592
239692
10
0.50
192563
168433
179993
177593
239691
1.00
192564
168434
179994
177594
239690
1.50
192566
168435
179995
177595
239689
2.00
192567
178353
179996
225525
239688
­– Stock Items.
PSI DROP
0.15
Note:
1. Flow settings are calibrated using water @ 70°F on increasing flow with units in horizontal position.
Consult factory for other fluid compatibility.
G-8
Ro H S
8
6
SPRING 170342 4
1.5 + 2.0 GPM
2
SETTINGS
0
0
1
SPRING 10397
0.15 - 1.00 GPM
SETTINGS
Visit www.GemsSensors.com for most current information.
2
3
4
FLOW RATE - GPM
5
6
7
PISTON TYPE
FS-380P Series – Industrial Strength
Inline Plastic Flow Switch
Flow Rate Settings: 0.07 GPM to 2.00 GPM
Port Size: 3/8˝ NPT Male and 1/4˝ Quick Disconnect (QDC) Male
Primary Construction Material: Polypropylene
Setting Type: Fixed
This rugged inline flow switch offers the same superior performance to
non-clogging as its metal cousin (FS-380). The fixed set point and simple design
make it a dependable switch. The FS-380P is an ideal choice for coolant applications
requiring reliable flow detection in HVAC, semiconductor, welding, medical and
other industries. 1/4˝ quick disconnect units have a host of snap-on mating
adapters to fit most piping requirements.
Specifications
G
EM
®
S CO PLIAN
M
T
Ro H S
G
EM
®
S CO PLIAN
M
T
Dimensions
See table at bottom right for adapter Part Numbers.
Glass Reinforced Polypropylene
PPS Composite
Spring
316 Stainless Steel
O-Ring
Fluorocarbon
11/16˝ HEX
11/16˝ HEX
1.00˝
1.00˝
(25 mm)
(25 mm)
Operating Pressure
125 PSI (8.6 bar) @ 70°F (21°C),
50 PSI (3.4 bar) @ 212°F (100°C)
Operating Temperature
0°F to 212°F (-18°C to +100°C)
Set Point Accuracy
20% of Set Point
Set Point Differential
20% Maximum
Switch*
SPST, 10VA, N.O. at no Flow
Electrical Termination
24˝ to 26˝ Polymeric Leads, 22 AWG
3/8˝ NPT Port
11/16˝ HEX
11/16˝ HEX
1.00˝
1.00˝
(25 mm)
(25 mm)
*See “Electrical Data” on Page X-5 for more information.
Part Numbers
3/8˝ NPT Male
216445**
216446**
0.15
209876
203206
0.25
197081
197091
0.50
197082
197092
1.00
197083
197093
1.50
197084
197094
2.00
197085
197095
* See selection of adapters at right.
QDC = Quick Disconnect
** Set point accuracy 0.06 to 0.1 GPM
4.00˝
(102 4.00˝
mm)
(102 mm)
Acetal Adapters for 1/4˝ Quick Disconnect
Male Tube Fitting Units (180°F max.)
These adapters are available with or without an integral
shut-off valve. The shut-off valve will stop line flow
when the adapter is removed from the unit. Flow
resumes when connected.
Typical shown: 1/4˝ NPT Male
Pipe Thread with Shut-off Valve
1/4˝ QDC Male*
0.07
FLOW
FLOW
0.75˝
0.75˝
(19 mm)
(19FLATS
mm)
ACROSS
ACROSS FLATS
ApprovalsCUL, RoHS
Specify Part Number based on flow settings. Adapters
for the 1/4˝ Quick Disconnect (QDC) Male unit are listed
in the table at right.
4.22˝
(107 4.22˝
mm)
(107 mm)
0.75˝
0.75˝
(19 mm)
(19FLATS
mm)
ACROSS
ACROSS FLATS
0.43˝
0.43˝
(11 mm)
(11 mm)
DIA. TYPICAL
DIA. TYPICAL
Filtration100 Micron
How To Order
FLOW
FLOW
FLOW SWITCHES
Piston
­– Stock Items.
Ro H S
1/4˝ Quick Disconnect Male Adapter
Wetted Materials
Housing
Flow Settings
GPM
File No. E31926
Part Numbers
Description
Straight Through with Shut-Off Valve
1/4˝ NPT Male Pipe Thread
195787
198063
1/4˝ BSPT Male Pipe Thread
198064
195788
3/8˝ NPT Male Pipe Thread
198065
198066
3/8˝ BSPT Male Pipe Thread
198067
198068
1/4˝ O.D., .27˝ I.D. (6 mm O.D., 4.3 mm I.D.) Polytube
198096
198097
3/8˝ O.D., 1/4˝ I.D. (9.5 mm O.D., 6 mm I.D.) Polytube
198099
198098
1/4˝ (6.4 mm) I.D. Barb
198401
198402
5/16˝ (7.9 mm) I.D. Barb
198403
198404
3/8˝ (9.5 mm) I.D. Barb
198408
198405
®
1/4˝ O.D. (6.4 mm) O.D. JG
198470
198406
3/8˝ O.D. (9.5 mm) O.D. JG®
198459
198407
JG® is a registered trademark of John Guest USA, Inc.
Visit www.GemsSensors.com for most current information.
G-9
FS-480 Series – Stainless Steel Flow
Switch for Large Flow, Low Pressure Drop
Flow Rate Settings: 0.50 GPM to 3.00 GPM
Port Size: 1/2˝ NPT, 3/4˝ NPT, 1/2˝ Tube Compression Fitting
Primary Construction Material: 316 Stainless Steel
Setting Type: Fixed
The FS-480 large-body inline flow switch delivers ample flow rates with minimal
pressure drop. 25% larger than its FS-380 sibling, the FS-480 is ideal for processes
that push more fluid through their systems and demand low pressure drops. Designed
to accommodate the Semiconductor Industry’s move to larger 300 mm wafer and
cross-over equipment, this switch is also perfect for critical medical equipment
applications. A glass-reinforced PPS piston and forged 316 stainless steel body make
this sensor rugged enough for high pressure lubrication and cooling systems as
well. This simple, yet meticulously perfected design provides the reliability required
in critical applications while allowing for much lower pressure drop rates than other
available switches.
File No. E31926
G
Specifications
PPS, Epoxy
Spring
316 Stainless Steel
O-Ring
Fluorocarbon
®
S CO PLIAN
M
T
SPRING
PISTON ASSY.
FLOW SWITCHES
1000 PSI (69 bar)
Operating Temperature
-20°F to +250°F (-28.8°C to +121°C)
Set Point Accuracy
±20% Maximum
Set Point Differential
20% Maximum
Dimensions
Recommended Filtration
100 Micron or better
1/2˝ NPT Ports
Switch*
SPST, 20VA, 120/240 VAC, N.O. at no Flow
Electrical Termination
No. 22 AWG, 24˝ PVC Cable
Straight design and large bore body minimizes pressure drop.
*See “Electrical Data” on Page X-5 for more information.
1.00˝
1.00˝
1.00˝
REFREF
REF
25.4
25.4
25.4
1.50˝
1.50˝
1.50˝
REFREF
REF
38 38
38
Pressure Drop – Typical 1.0 GPM Set Point
1.00˝
1.00˝
1.00˝
REFREF
REF
25.4
25.4
25.4
4.94˝
4.94˝
4.94˝
REFREF
REF
125125
125
3/4˝ NPT Ports
1.00˝
1.00˝
1.00˝
REFREF
REF
25.4
25.4
25.4
1.50˝
1.50˝
1.50˝
REFREF
REF
38 38
38
2.0
EM
FLOW BODY
316 Stainless Steel
Piston
1.0
T
G
Operating Pressure, Maximum
PSID
®
S CO PLIAN
M
Ro H S
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
FLOW RATE IN GPM
1.00˝
1.00˝
1.00˝
REFREF
REF
25.4
25.4
25.4
4.95˝
4.95˝
4.95˝
REFREF
REF
125125
125
1/2˝ Tube End Compression Fitting
How To Order – Standard Models
1.00˝
1.00˝
1.00˝
REFREF
REF
25.4
25.4
25.4
Specify Part Number based on flow settings.
Flow Settings*
GPM
1/2˝ NPT Port
3/4˝ NPT Port
1/2˝ Tube
Compression Fitting
0.50
206915
204715
204710
1.00
206916
204716
204711
1.50
206917
204717
204712
2.00
206918
204718
204713
3.00
206919
204719
204714
1/2˝1/2˝
TUBE
END
1/2˝
TUBE
TUBE
END
END
COMPRESSION
COMPRESSION
COMPRESSION
FITTING
FITTING
FITTING
1.50˝
1.50˝
1.50˝
REFREF
REF
38 38
38
1.00˝
1.00˝
1.00˝
REFREF
REF
25.4
25.4
25.4
7/8˝7/8˝
HEXHEX
7/8˝
HEX
*Calibrated with unit in horizontal position.
G-10
EM
SWITCH ASSY.
Wetted Materials
Housing/End Fitting
15.00
14.00
13.00
12.00
11.00
10.00
9.00
8.00
7.00
6.00
5.00
4.00
3.00
2.00
1.00
0.00
0.0
Ro H S
Visit www.GemsSensors.com for most current information.
7/8˝7/8˝
HEXHEX
7/8˝
HEX
5.40˝
5.40˝
5.40˝
REFREF
REF
137137
137
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
U.L. Recognized —
File No. E31926
CSA Listed —
File No. LR30200
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.
Ro H S
G
EM
®
S CO PLIAN
M
T
Ro H S
G
EM
®
S CO PLIAN
M
T
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
Dimensions
OUT
*See “Electrical Data” on Page X-5 for more information.
2-3/4"
(69.9 mm)
How To Order – Standard Models
5/8"
(15.9 mm)
3/8"
(9.5 mm)
1/4" NPT
IN
1"
(25.4 mm)
1"
(25.4 mm)
1"
(25.4 mm)
1/4" NPT
FLOW SWITCHES
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).
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
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.
Pressure Drop – Typical
4
PRESSURE DROP (PSID)
Flow Settings
GPM
3
Part No. 70823
2
Part No. 70820
1
0
0
0.5
1.0
1.5
2
FLOW RATE - GPM
Tests conducted with units in vertical position (lead wires up) with water at
+70°F (21°C).
Visit www.GemsSensors.com for most current information.
G-11
FS-925 Series – General Purpose
Flow Rate Settings: Liquids: 0.1 GPM to 1.5 GPM
Air/Gases: See Flow Settings at right
FS-926 Series – Low Flow
ed
pprov
UL A on-Proof
si
Explo
Port Size: 1/4˝ NPT
Primary Construction Material: Brass or Stainless Steel
Setting Type: Fixed
Flow Rate Settings: Liquids: 50-300 cc/min.
Air/Gases: See Flow Settings at right
These two series of precision-calibrated switches provides reliable and consistent
performance; repeatability is within 1%. FS-925 and FS-926 units are factory preset
for actuation at specified flow rates.
These switches provide accurate detection of excessive or insufficient flow rates
in such applications as: protecting against loss of fluid flow in hydraulic systems,
assuring proper coolant flow in semiconductor processing equipment, monitoring high
pressure lubrication systems, and ensuring proper air flow in water/waste systems.
U.L. Recognized — File No. E31926
CSA Listed — File No. LR30200
FM Approved — File No. 1H3A2.AX
and 0A8A3AE
FS-925/926 Series
Ro H S
G
EM
®
S CO PLIAN
M
T
Ro H S
G
EM
®
S CO PLIAN
M
T
Specifications
Wetted Materials
Housing
Piston
In Brass Housing
Stainless Steel Housing
Low Flow Piston (FS-926)
FLOW SWITCHES
Spring
O-Ring
Other Wetted Parts
Pressure Rating
Operating, Maximum
Proof
Burst
Operating Temperature 
With Brass or S.S. Piston
With Polysulfone Piston
Brass or 316 Stainless Steel
Polysulfone for water; Brass for oil or air
316 Stainless Steel
Viton®
Epoxy
Both the FS-925 and FS-926 use a spring-loaded
piston to detect positive flow with great precision. They
act upon direct fluid flow and will not show “falsepositive” flow indication as can happen with sensors
using indirect sensing methods such as pressure
measurement. The FS-926 incorporates an additional
lap-fitted piston for very low flows; see below.
1000 PSIG (69 bar)
Dimensions
316 Stainless Steel
Same as Housing
5000 PSIG (345 bar)
-20°F to +300°F (-29°C to +148.9°C)
1% Maximum Deviation
Set Point Accuracy
 ±10%
Set Point Differential
15% Maximum
Switch*
SPDT, 20 VA
Inlet/Outlet Ports
1/4˝ NPT
Electrical Termination
No. 18 AWG, 24˝ L., Polymeric Lead Wires
4-1/8"
(104.7 mm)
1-1/4" (31.7 mm)
27/32" (21.4 mm)
Double Piston Detects Minute Flow – FS-926
MAGNET CARRIER
PISTON
An additional, lap-fitted
piston is used in Gems
FS-926 Series to accurately
detect low-flow rates.
Calibration is determined
by one or more metering
holes in the end of the lowflow piston, which regulate
bypass flow, and therefore
the actuation setting.
1/4" NPT
BOTH PORTS
3/4"
(19.0 mm)
1"
(25.4 mm)
1-3/4"
(44.4 mm)
Electrical Connection, 1/2˝ NPT Conduit
When metered bypass flow is exceeded, the resultant pressure differential displaces
the low-flow piston, moving the magnet carrier piston to actuate the reed switch.
Two large bypass holes in the piston skirt are exposed after actuation to maintain low
pressure drop.
G-12
2-3/8"
(60.3 mm)
1/2" (12.7 mm)
*See “Electrical Data” on Page X-5 for more information.
BY-PASS
HOLES
METERING
ORIFICE
LOW-FLOW
PISTON
9/32" DIA. (7.1 mm)
MTG. HOLES (2)
-20°F to +225°F (-29°C to +107.2°C)
Repeatability
O-RING
1/4" (6.3 mm)
2500 PSIG (172 bar)
Visit www.GemsSensors.com for most current information.
1/2"
(12.7 mm)
PISTON TYPE
Flow Settings, Air (Typical)
Pressure Drop - Typical
Dependent on operating line pressure. Examples of set point ranges at a given line
pressure are shown below.
FS-925 Series
Line
Pressure
FS-925
FS-926
Min.
Max.
Min.
Max.
5 PSIG (Minimum)
0.5 SCFM
10 SCFM
2 SCFH
15 SCFH
100 PSIG
1.5 SCFM
25 SCFM
7 SCFH
50 SCFH
4
PRESSURE DROP (PSID)
Actuation Point
Part No. 26919
3
Part No. 26917
2
1
Part No. 26914
Minimum 5 PSI line pressure required.
0
0.05
Gas Calibration
Water flow units should not be used for air/gas applications: Gas flow units have a
special dash-pot piston for reliable operation. Gas calibration is dependent upon line
pressure, switch orientation, and the specific type of gas. The calibrated flow set point
is subject to change with fluctuations in line pressure.
How To Order – Standard Models – Water Calibration
.75
1.0
1.5
2
FLOW RATE - GPM
Tests conducted with units in vertical position (lead wires up) with water at
+70°F (21°C).
FS-926 Series
FS-925 Series – General Purpose
PRESSURE DROP (PSID)
2.0
Specify Part Number based on desired housing material and flow setting.
Liquids other than water: Special calibration is available from GEMS for media other
than water. Please consult factory with your requirements, including housing material
(brass or stainless steel), flow media, operating pressure, flow set point and liquid
viscosity (SSU). A lot charge will be applied for special calibrations.
Gas flow: Consult factory for available calibrations. Specify: Housing material (brass
or stainless steel), gas type, mounting orientation, operating pressure and actuation
setting (SCFM or SCFH) and normal flow rate. A lot charge will be applied for special
calibrations.
Part No.
26938
1.5
Part No. 26941
Part No. 26944
1.0
0.5
0
0
50
100
150
200
250
300
350
400
FLOW RATE - cc/Min.
Tests conducted with units in vertical position (lead wires up) with water at
+70°F (21°C).
Brass
316 S.S.
0.10
26914
26926
0.25
26915
26927
0.50
26916
26928
0.75
26917
26929
1.00
26918
26930
1.50
26919
26931
FS-925 and FS-926 switches are U.L. Approved for
Class I, Division 2, Groups A, B, C, D hazardous
locations.
They are also available with FM-approved, explosionproof junction box for Class I, Division 1, Group
D hazardous locations. Units must be assembled
completely at GEMS.
U.L. Approved — File No. E183854
FS-926 Series – Low Flow
FLOW SWITCHES
Part Numbers
Flow Settings
GPM, ±10%
Standard Wiring Color Code
Flow Setting
Part Numbers
Wire Color
Terminal
cc/Min. ±10%
Equiv. GPM
Brass Material
316 S.S. Material
Orange
N.O.
50
.013
26938
26951
Black
Common
100
.025
26939
26952
Red
N.C.
150
.045
26941
26953
200
.055
26942
26954
250
.065
26943
26955
300
.075
26944
26956
Notes:
1.Flow settings are calibrated using water @ +70°F on increasing flow, with units in a vertical position
(lead wires up). Consult factory regarding special flow setting calibration.
2.Temperature changes will slightly affect the standard water or gas flow settings listed. Oil flow settings
will vary with viscosity.
3.Use of 50 micron filtration is recommended.
­– Stock Items.
Visit www.GemsSensors.com for most current information.
G-13
FS-10798 Series – Externally Adjustable for
Water, Oils and Gases
Flow Rate Settings: Liquids: Infinite Adjustment between 0.5 GPM and
20.0 GPM
ed
pprov
UL A on-Proof
si
Explo
Air/Gases: See Gas Flow Adjustment Ranges below
Port Size: 1/2˝ NPT
Primary Construction Material: Brass or Stainless Steel
Setting Type: Adjustable
These externally adjustable switches are ideal for protecting machine tools from
coolant flow failure, for protecting bearings from loss of lubricant or to assure proper
air flow. They offer an infinite number of flow settings at pressures up to 1000 PSIG,
with low pressure drop and precise repeatability.
The adjusting vane is easily field adjustable using an ordinary flat-bladed screwdriver.
The adjustment is set-screw-locked for tamper-free operation after field calibration.
Shown with optional 1/2”
conduit connector.
Ro H S
G
Specifications
®
S CO PLIAN
M
T
Ro H S
G
EM
®
S CO PLIAN
M
T
With Wire Leads and Strain Relief
Brass or 316 Stainless Steel
Piston
In Brass Housing
Polysulfone for water; Brass for oil or air
In Stainless Steel Housing
FLOW ACTUATION ADJUSTMENT
3/4"
(19.0 mm)
Spring
316 Stainless Steel
O-Ring
Viton
Other Wetted Parts
Epoxy
®
FLOW SWITCHES
Pressure Rating
Operating
2"
(50.8 mm)
LOW
ITCH-F
316 Stainless Steel Only
SW
OUT
P/N
MFRS.
S/N
MFRS.
.
TYPE NO
NO.
R.
NT
CO
NO.
STOCK
SPEC.
5/8"
(15.8 mm)
MAX
MIN
4-1/8"
(104.7 mm)
1-1/4"
(31.7 mm)
1/2" NPT BOTH PORTS
1000 PSIG (69 bar)
Proof
2500 PSIG (172 bar)
Burst
5000 PSIG (345 bar)
Operating Temperature
With Brass or S.S. Piston
-20°F to +300°F (-29°C to +148.9°C)
With Polysulfone Piston
-20°F to +225°F (-29°C to +107.2°C)
Repeatability
1% Maximum Deviation
Set Point Accuracy
±10% Maximum
Set Point Differential
15% Maximum
Switch*
SPDT, 20 VA
Inlet/Outlet Ports
1/2˝ NPT
Electrical Termination
No. 18 AWG, 24˝ L., Polymeric Lead Wires
With 1/2˝ NPT Conduit Connector
1/2"
(12.7 mm)
1-1/16"
(26.9 mm)
MAX.
*See “Electrical Data” on Page X-5 for more information.
Air/Gas Flow Adjustment Ranges
Water or oil flow units should not be utilized for air/gas applications. The FS-10798
Gas Flow configuration utilizes a special dash-pot piston for reliability. The flow
adjustment ranges are typical for air service. For other gases, the flow range will vary
with the density of the gas. Please consult factory for more information.
1 to 75 SCFM Approx.
3 to 160 SCFM Approx.
* Minimum 5 PSI line pressure required.
G-14
EM
Dimensions
Wetted Materials
Housing
For 5 PSIG Line*
For 100 PSIG Line
U.L. Recognized — File
No. E31926
CSA Listed —
File No. LR30200
Visit www.GemsSensors.com for most current information.
IN
IN
PISTON TYPE
How It Works
HERMETICALLY SEALED
SPDT SWITCH
0.5 GPM
PERMANENT MAGNET
PISTON
2.5
PRESSURE DROP (PSID)
SPRING
Pressure Drop - Typical
HOUSING
VALVE ADJUSTMENT
LOCKING SET SCREW
2.0
1.5
Part No. 25357
1.0
0.5
0
FLOW ADJUSTMENT
VANE
0
0.5
1.0
2.0
FLOW RATE - GPM
MAGNETIC SWITCH
10 GPM and 20 GPM
Flow diagram with switch
shown actuated.
ADJUSTMENT
An externally rotatable vane is positioned in the main flow path within the unit. The
magnet carrier piston is located in a bypass flow chamber. Pressure differential,
caused by flow around the adjusting vane, displaces the spring-biased piston which
actuates a hermetically sealed SPDT reed switch within the unit.
12
Part No. 25358
8
4
0
0
5
10
15
20
25
How To Order – Standard Models
Specify Part Number based on desired media, piston material and electrical termination.
Housing
Liquids
Gases
Part Numbers
With 1/2˝
With Lead
Conduit
Wires
Connector
Materials
Media
Brass
Piston
Brass (for Oils)
61205
49073
Polysulfone (for Water)
30
FLOW RATE - GPM
Tests conducted with units in horizontal position with water at +70°F (21°C).
Data will vary slightly for vertically mounted units.
FS-10798 switches are U.L. Approved for Class I,
Division 2, Groups A, B, C, D hazardous locations.
U.L. Approved — File No. E183854
FLOW SWITCHES
PISTON
PRESSURE DROP (PSID)
16
Standard Wiring Color Code
25357
25363
316 Stainless Steel
25358
25364
Wire Color
Brass
25359
25365
Orange
N.O.
316 Stainless Steel
25360
25366
Black
Common
Red
N.C.
Notes:
1. Temperature changes will slightly affect the standard water or gas flow settings listed.
Oil flow settings will vary with temperature and viscosity.
2. Use of 50 micron filtration is recommended.
Terminal
­– Stock Items.
Visit www.GemsSensors.com for most current information.
G-15
FS-930 Series – Oil Flow Switch,
Compensates For Viscosity Change In Fluids
Flow Rate Settings: 0.1 GPM to 1.0 GPM
Port Size: 1/4˝ NPT
Primary Construction Material: Brass
Setting Type: Fixed
ed
pprov
UL A on-Proof
si
Explo
A unique, patented piston design assures accuracy within 20% over a full range of
viscosities—from 40 to 2000 SSU. Ideal for use in applications where liquids of different
viscosities are blended; or for use in lubrication systems where oil flow monitoring is
critical at start-ups. Switch compensates for viscosity changes automatically. Each unit
is factory preset, using 300 SSU oil, for actuation at specified flow rates.
Ro H S
G
EM
®
S CO PLIAN
M
Ro H S
G
Brass
Piston
Brass
Spring
316 Stainless Steel
O-Ring
Other Wetted Parts
Pressure Rating
Operating, Maximum
Viton®
Epoxy
1000 PSIG (69 bar)
Proof
2500 PSIG (172 bar)
Burst
5000 PSIG (345 bar)
FLOW SWITCHES
Operating Temperature 
-20°F to + 300°F (-29°C to +148.9°C)
Repeatability
1% Maximum Deviation**
Set Point Accuracy
±10%
Set Point Differential
15% Maximum
Switch*
SPDT, 20 VA
Inlet/Outlet Ports
1/4˝ NPT
Electrical Termination
No. 18 AWG, 24˝ L., Polymeric Lead Wires
Explosion-Proof Approvals
U.L. Approved for Class I, Division 2, Groups A, B,
C, D. Also available with FM approved, explosion
proof junction box for Class I, Division 1, Group D
hazardous locations.
U.L. Approved — File No. E183854, RoHS
* See “Electrical Data” on Page X-5 for more information
**Reference at 300 SSU set point.
Dimensions
1/4" (6.3 mm)
9/32" DIA. (7.1 mm)
MTG. HOLES (2)
4-1/8"
(104.7 mm)
2-3/8"
(60.3 mm)
1/2" (12.7 mm)
1-1/4" (31.7 mm)
27/32" (21.4 mm)
1/4" NPT
BOTH PORTS
3/4"
(19.0 mm)
1"
(25.4 mm)
1-3/4"
(44.4 mm)
Electrical Connection, 1/2˝ NPT Conduit
1/2"
(12.7 mm)
G-16
EM
®
S CO PLIAN
M
T
U.L. Recognized —
File No. E31926
Specifications
Wetted Materials
Housing
T
Visit www.GemsSensors.com for most current information.
PISTON TYPE
How To Order – Standard Models
Pressure Drop – Typical
5
Flow Setting
GPM, ±10%
Part
Numbers
0.10
51582
0.25
51586
0.50
51590
0.75
51594
1.00
51598
4
Part No. 51590
3
2
Part No. 51598
Part No. 51582
1
0
0.1
Notes:
1. Flow settings are calibrated in a vertical position (lead wires up) with 300 SSU oil. Set points will
be maintained within 20% of settings in a liquid viscosity range of 40 to 2,000 SSU.
2. Use of 50 micron filtration is recommended.
0.5
1.0
1.5
FLOW RATE - GPM
Tests conducted with units in vertical position (lead wires up) with water at
+70°F (21°C).
FS-930 switches are U.L. Approved for Class I,
Division 2, Groups A, B, C, D hazardous locations.
They are also available with FM-approved, explosionproof junction box for Class I, Division 1, Group
D hazardous locations. Units must be assembled
completely at GEMS.
U.L. Approved — File No. E183854
Standard Wiring Color Code
Wire Color
Terminal
Orange
N.O.
Black
Common
Red
N.C.
FLOW SWITCHES
­– Stock Items.
PRESSURE DROP (PSID)
Specify Part Number based on flow setting.
Visit www.GemsSensors.com for most current information.
G-17
Shuttle Type Switches –
For Moderate to High Liquid Flow Rates
 Models for flow rate settings from .5 GPM to 100.0 GPM
 Rugged housings with port sizes ranging from 3/4˝ NPT to 3˝ NPT
 Efficient flow paths assure low line pressure drop at full flow
Typical Applications
Protect bearings or gears from loss of lubricant flow. Can reduce maintenance costs on…
• Oil separators • Fuel Systems • Pumps • Compressors • Presses
Provide instant, automatic shutdown if coolant flow falls off in electronics or machinery, such as…
• Heat Exchangers • Semiconductor Manufacturing Equipment
• Induction Furnaces • Radio Transmitters
Assure efficient operation of process systems, including…
• Water Filtration and Reverse Osmosis • Chlorinators • De-icers
• Sterilizers • Evaporators
Design Data
General Operating Principle (FS-200 Series Shown)
Adjustable Versions
LEAD
WIRES
BONNET
HERMETICALLY
SEALED SWITCH
PERMANENT
MAGNET
SPRING
FLOW SWITCHES
OUTLET
PORT
INLET
PORT
HOUSING
SHUTTLE
As liquid flow increases
to the actuation setting, a
magnet-equipped shuttle
is displaced. When
displaced by fluid flow,
this shuttle actuates
a hermetically sealed,
SPDT or SPST reed
switch within the unit
stem. A compression
spring or gravity
provides shuttle return
when flow decreases.
This reed switch, when actuated, can be used to
operate remote alarms or indicators, or may be
integrated into automatic system controls.
Typical flow diagram
showing switch actuated.
90° Flow Path Versions
OUTLET
PORT
BONNET
SPRING
PERMANENT
MAGNET
Replace an ordinary 90° pipe joint with an
FS-400 Series switch to monitor liquid flow
with 1% repeatability. A choice of seven
flow rate actuation settings ranging from
0.75 GPM to 10.0 GPM are offered.
Vane fully open
(high flow)
SHUTTLE
FS-400 Series
(Partial Cutaway)
INLET PORT
G-18
FS-400 Adjustable
(Partial view)
Adjustable versions of the FS-200 and FS-400 Flow
Switches incorporate an internal adjustable bypass
vane which is controlled externally using an ordinary,
flat-blade screwdriver. As the bypass vane is rotated
to its open position, an increasing amount of liquid is
allowed to bypass the shuttle assembly, resulting in
the need for a higher rate of flow to actuate the switch;
closing the adjustable bypass vane results in switch
actuation at lower flow rates. Switch actuation can be
set from 0.75 GPM to 15 GPM.
Regulating action of the bypass vane is
shown here for the FS-400 Adjustable
unit, and functions the same in the
FS-200 Adjustable versions.
LEAD WIRES
HOUSING
FS-200 Adjustable
(Partial view)
Visit www.GemsSensors.com for most current information.
Vane fully closed
(low flow)
SHUTTLE TYPE
All Plastic, Transparent Versions
Contents
BONNET
The FS-400P Series is an inexpensive
alternative for plastic piping systems.
Units are available in clear PVC
housings. The clear version, with a
bright red shuttle, provides highly
visible affirmation of flow status.
Low-cost, all PVC versions are for use
in systems where liquid pressures are
below 120 PSIG and temperatures do
not exceed 120°F. An easily removed,
one-piece bonnet and shuttle assembly
for quick clean-out is featured.
SHUTTLE
HERMETICALLY
SEALED SWITCH
HOUSING
Typical Bonnet and Shuttle Removal
While a slight accumulation of foreign material within shuttle type units will not affect
operation, 150 micron filtration is suggested. Any sizable amount of contamination
should be removed. Removing the bonnet nut on FS-200, and FS-400 Series units
allows the shuttle assembly to be removed for cleaning without disturbing the
installation. Sliding keys on the FS-400P are removed, or the bonnet is twisted on the
FS-500, for the one-piece bonnet/shuttle to be lifted out of its housing. Consult the
factory for replacement parts. Damaged electrical components must be replaced at the
factory.
LOCKING KEYS
SLIDE OUT
TO RELEASE
BONNET
FS-200 Series
General Purpose,
Straight-Through Flow Path...................... G-20
FS-200 Series Adjustable
Externally Adjustable
Actuation Set Point........................................ G-20
FS-400 Series
General Purpose, 90° Flow Path.............. G-22
FS-400 Series Adjustable
Externally Adjustable
Actuation Set Point........................................ G-22
FS-400P Series
Low-Cost, All PVC........................................... G-23
FS-500 Series
Low-Cost, All Polypropylene.................... G-24
FS-500 Series
BONNET AND
SHUTTLE LIFT
OUT OF
HOUSING
HOUSING
STAYS IN
PIPING
SYSTEM
BONNET IS
RELEASED
WITH A
COUNTERCLOCKWISE
TWIST
BONNET AND
SHUTTLE LIFT
OUT OF HOUSING
HOUSING STAYS
IN PIPING
SYSTEM
Visit www.GemsSensors.com for most current information.
FLOW SWITCHES
FS-400P Series
Page Start
G-19
FS-200 Series – General Purpose,
Straight-Through Flow Path
Flow Rate Settings: Fixed: 0.5 GPM to 100.0 GPM
Adjustable: 1.0 GPM to 15.0 GPM
ed
pprov
UL A on-Proof
si
Explo
Port Size: 1˝ NPT to 2˝ NPT
FS-200 Series
Ro H S
G
EM
U.L. Recognized
File No. E31926
CSA Listed —
File No. LR30200
and LR22666
FM Approved —
File No. 0A8A3.AE
and 1H3A2.AX
®
S CO PLIAN
M
T
Ro H S
G
EM
®
S CO PLIAN
M
T
Primary Construction Material: Bronze or Stainless Steel
Setting Type: Fixed or Adjustable
The FS-200 Series offers accurate flow detection, with 1% repeatability, over a broad
range of flow settings and port sizes. Its durable construction delivers long-life
reliability in either water or oil. Generous flow paths keep pressure drop low. These
switches are ideal for detection of improper flow rates in high volume lubrication,
cooling or process systems.
FS-200 Adjustable Series switches offer the same accuracy and are as rugged as those
with fixed settings, but provide one additional feature: external adjustability. With these
versatile switches your choice of flow settings is diverse within a given range. An
ordinary, flat-blade screwdriver is all that’s required for the actuation adjustment.
FS-200 Adjustable
U.L. Recognized
File No. E31926
CSA Listed —
File No. LR22666
FM Approved —
File No. 0Q2A8.AE
Ro H S
G
EM
®
S CO PLIAN
M
T
Ro H S
G
EM
®
S CO PLIAN
M
T
Specifications
Wetted Materials
Housing
FS-200
FS-200 Adjustable
Bronze or 316 Stainless Steel
Bronze
FLOW SWITCHES
Shuttle
Teflon®
Bonnet
Bronze or Stainless Steel
Spring
316 Stainless Steel
Other Wetted Parts
Viton®, Ceramic
Pressure Rating
Operating
Proof
400 PSIG (27.6 bar) @ 100°F (37.8°C)
Dimensions
#18 AWG., 24" L.,
POLYMERIC JACKET
1/2" -NPT
BONNET
SWITCH
HOUSING
B
800 PSIG (55.2 bar) @ 100°F (37.8°C)
INLET PORT
Operating Temperature
FS-200
-20°F to +300°F (-29°C to +148.9°C)
FS-200 Adjustable
-20°F to +200°F (-29°C to +93.3°C)
Repeatability
1% Maximum Deviation
Set Point Accuracy
±10%
Set Point Differential
15% Maximum
Switch*
SPDT, 20 VA
Electrical Termination
No. 18 AWG, 24˝ L., Polymeric Lead Wires
Red NC, Black Common, Orange NO
NPT PORT
A
Model
C
Port Size
NPT
A
inch (mm)
B
inch (mm)
C Hex
inch (mm)
1˝
3-1/4 (82.6)
3 (76.2)
1-25/32 (45.2)
1-1/4˝
4 (101.6) 3-3/16 (80.9) 2-3/16 (55.5)
FS-200
and
1-1/4˝ ss 4-1/2 (114.3) 3-3/16 (80.9) 2-3/16 (55.5)
FS-200
Adjustable 1-1/2˝ 4-1/2 (114.3) 3-1/2 (88.9) 2-1/2 (63.5)
*See “Electrical Data” on Page X-5 for more information.
2˝
5-3/8 (136.5)
4 (101.6)
3-3/32 (78.5)
Notes:
1. Adjustable versions available in 1 inch port sizes only.
2. Standard calibration is in water with units in a horizontal position.
3. Viscosity changes will affect setpoints. Typically, as viscosity
increases setpoints will decrease.
4. Consult Gems for special applications.
G-20
Visit www.GemsSensors.com for most current information.
SHUTTLE TYPE
How To Order – Standard Models
Pressure Drop - Typical
Specify Part Number for the FS-200 Series based on desired housing material, port
size and flow setting, or based on flow setting range for FS-200 Adjustable versions.
1˝ NPT and 1-1/2˝ NPT Ports
1.6
FS-200 Series
1”
1-1/4”
Port Size
NPT
Flow
Setting
GPM
1.5
Part Numbers
Stainless
Bronze
Steel
27085
27093
1.6
1.6
27052
27060
3
27086
27094
2
27053
27061
5
27087
27095
1.6
3
27054
27062
7.5
27088
27096
0
4
27055
27063
10
27089
27097
5
27056
27064
15
27090
27098
6
27057
27065
20
27091
27099
8
27058
27066
30
27092
27100
1
27067
27076
2
27101
27109
2
27068
27077
4
27102
27110
4
27069
27078
5
27103
27111
6
27070
27079
10
27104
27112
8
27071
27080
15
27105
27113
10
27072
27081
25
27106
27114
12
27073
27082
35
27107
27115
16
27074
27083
50
27108
27116
20
27075
27084
1-1/2”
2”
Port Size NPT
1”
Part No. 27051
1.6
1
Part No. 27085
1.6
0
5
10
15
20
25
30
35
40
60
70
80
FLOW RATE - GPM
2˝ NPT Ports
2.0
1.5
Part No. 27101
1.0
0.5
0
0
10
20
30
40
50
FLOW RATE - GPM
Tests conducted with units in horizontal position (lead wires up) with water at
+70 F (21 C).
FS-200 Series Flow Switches are U.L. Approved for
Class I, Division 2, Groups A, B, C, D hazardous areas.
FS-200 Adjustable
Flow Setting Adjustment Range GPM
Part Numbers
1.0-6.0
26615
5.0-15.0
26616
2.0-8.0
26838
Notes:
1. Flow settings for fixed versions are calibrated using water at +70°F on increasing flow, with units in a
horizontal position (lead wires up). Consult factory regarding special flow setting calibration, or liquids other
than water. Temperature changes will slightly affect the flow settings listed. Oil flow settings will vary with
viscosity.
2. Adjustable units that are set to customer specification are subject to GEMS test stand accuracy.
3. Use of 150 micron filtration is recommended.
4. Minimum 5 PSI line pressure required.
­– Stock Items.
1.6
They are also available with FM-approved,
explosion-proof junction box for Class I,
Division 1, Group D hazardous locations.
Units must be completely assembled at GEMS.
U.L. Approved — File No. E183854
FLOW SWITCHES
0.5
Part Numbers
Stainless
Bronze
Steel
27051
27059
PRESSURE DROP (PSID)
Flow
Setting
GPM
PRESSURE DROP (PSID)
Port Size
NPT
1.6
For Remote Alarms –
See Page E-30
• Adjustable Volume
• Indoor Outdoor
• Solid-State
Visit www.GemsSensors.com for most current information.
G-21
FS-400 Series –
General Purpose, 90° Flow Path
ed
pprov
UL A on-Proof
si
Explo
Flow Rate Settings: Fixed Version: 0.75 GPM to 10.0 GPM
Adjustable Version: 0.75 GPM to 14.0 GPM
G
EM
®
S CO PLIAN
M
T
Ro H S
G
EM
®
S CO PLIAN
M
T
Ro H S
G
Port Size: 3/4˝
Ro H S
EM
®
S CO PLIAN
M
T
Ro H S
G
EM
®
S CO PLIAN
M
T
Primary Construction Material: Bronze
Setting Type: Fixed or Adjustable
Provides accurate flow detection in water and oil with 1% repeatability. Flow settings
on the adjustable version can be easily changed without disassembly. A shuttle bypass vane inside the housing is controlled externally using an ordinary flat-blade
screwdriver. These switches are ruggedly constructed of non-corrosive materials and
resist shock and vibration. Suitable for triggering alarms on interlocking shutdown
circuitry when flow rate is improper to protect bearings, gears and cooling systems.
Specification
Wetted Materials
Housing
FS-400 Adjustable
U.L. Recognized —
File No. E31926
CSA Listed —
LR30200 and LR22666
FM Approved —
File No. 0A8A3.AE and
1H3A2.AX
CSA Listed —
File No. LR22666
FM Approved —
File No. 0A8A3.AE
Bronze
Shuttle
Delrin®
Spring
316 Stainless Steel
O-Ring
Viton®
Other Wetted Parts
Ceramic
Pressure Rating, Maximum
Operating
Dimensions
1-7/16" HEX
(36.5 mm)
800 PSI (55.2 bar) @ 100°F (+37.8°C)
3-27/32"
(97.6 mm)
-20°F to +180°F (-29°C to +82.2°C)
Repeatability
1% Maximum Deviation
Set Point Accuracy
±10%
Set Point Differential
15% Maximum
Switch*
SPDT, 20 VA
Inlet/Outlet Ports
3/4˝ NPT
Electrical Termination
No. 18 AWG, 24˝ L., Polymeric Lead Wires
1-3/8"
(34.9 mm)
1-3/8"
(34.9 mm)
Pressure Drop - Typical
*See “Electrical Data” on Page X-5 for more information.
30
How To Order – Standard Models
25
Specify Part Number based on flow settings for the FS-400 Series, based on flow
setting range for the FS-400 Adjustable version.
FS-400 Series
FS-400 Adjustable
Flow Setting
GPM
Part
Numbers
0.75
26440
1.5
26441
2.0
26442
2.5
26443
5.0
26444
7.5
26445
10.0
26446
NPT
3/4˝
Flow Setting
GPM
Part
Numbers
0.75-4.0
26600
2.0-8.0
26601
7.0-14.0
26602
PRESSURE DROP (PSID)
FLOW SWITCHES
Operating Temperature
3/4˝
20
Part No. 26446
15
10
Part No. 26443
5
Part No. 26440
0
0
5
10
15
20
FLOW RATE - GPM
Tests conducted with units in vertical position (lead wires up) with water at
+70°F (21°C).
FS-400 switches are U.L. Approved for Class I,
Division 2, Groups A, B, C, D hazardous areas.
Notes:
1. Flow settings for Fixed Version are calibrated using water at +70°F on increasing flow, with units in a
vertical position (lead wires up). Temperature changes will slightly affect the flow settings listed.
2. Adjustable units that are set to customer specifications are subject to GEMS test stand accuracy.
3. Use of 150 micron filtration is recommended.
4. Minimum 5 PSI line pressure required.
Available with FM-approved, explosion-proof junction
box for Class I, Division 1, Group D hazardous locations.
Units must be assembled completely at GEMS.
U.L. Approved — File No. E183854
­– Stock Items.
G-22
1/2" NPT
400 PSI (27.6 bar) @ 100°F (+37.8°C)
Proof
NPT
FS-400 Series
Visit www.GemsSensors.com for most current information.
SHUTTLE TYPE
FS-400P Series – Low Cost Units for
Plastic Piping
Flow Rate Settings: 0.5 GPM or 2.0 GPM
Port Size: 3/4˝ or 1˝ IPS
Primary Construction Material: Clear PVC
Setting Type: Fixed
U.L. Recognized —
File No. E31926
CSA Listed —
Ro H S File No. LR30200
G
EM
®
S CO PLIAN
M
T
Ro H S
G
EM
®
S CO PLIAN
M
T
Designed for low cost flow/no-flow monitoring. This series is available with a clear
transparent PVC housing which is ideal for use where visual flow confirmation is
desirable. These corrosion-resistant switches offer broad chemical compatibility.
With only one moving part, their rugged construction offers long life with minimum
maintenance. Ideal for water heating or purification, equipment cooling and general
chemical processing use.
Specifications
PVC
O-Ring
Buna N
Other Wetted Parts
Epoxy
Operating Pressure, Maximum
120 PSIG (8.3 bar) @ +70°F to +100°F
@ +21°C to +37.8°C
50 PSIG (3.4 bar) @ +101°F to +120°F
@ +38.3°C to +48.9°C
Operating Temperature, Maximum
Clear Version
+120°F (+48.9°C)
Set Point Accuracy
± 20%
Set Point Differential
20% Maximum
Switch*
SPST, 20 VA N.O. @ No Flow
Inlet/Outlet Ports
3/4˝ or 1˝ IPS and 1/2˝ NPT
Mounting Attitude
Vertical, Inlet Down
Electric Termination
No. 22 AWG, 24˝ L., PVC Lead Wires
BONNET AND
SHUTTLE LIFT
OUT OF
HOUSING
Cleanout is quick and
easy. Two locking
keys slide out to allow
removal of a one-piece
bonnet and shuttle
assembly. Housing
and piping are left
undisturbed.
HOUSING
STAYS IN
PIPING
SYSTEM
Dimensions
3/4˝ IPS Size (Both Ports)
1˝ IPS Size (Both Ports)
(All other dimensions are
the same as 3/4˝ size)
1-5/8"
(41.3 mm) DIA
BONNET
FLOW SWITCHES
Materials
Housing, Shuttle and Bonnet
LOCKING KEYS
SLIDE OUT
TO RELEASE
BONNET
HOUSING
3-13/16"
(96.8 mm)
*See “Electrical Data” on Page X-5 for more information.
1-1/2"
(38.1 mm)
How To Order – Standard Models
Specify Part Number based on material and port size.
PVC
Material
Clear
Port
Size
Actuation on
Increasing Flow
Part
Numbers
1/2˝ NPT*
0.5 GPM ±20%
135805
3/4˝ IPS
0.5 GPM ±20%
135810
1˝ IPS
2.0 GPM ±20%
135815
1/2˝ NPT
4-3/8"
(111.1 mm)
*3/4˝ IPS model with 1/2˝ NPT port adapter installed.
Notes:
1. Care should be taken by specifiers to ensure fluid
compatibility with the above listed wetted materials.
2. Use of 150 micron filtration is recommended.
2-1/16"
(52.4 mm)
Pressure Drop - Typical
3
PRESSURE DROP (PSID)
­– Stock Items.
2
Part No.135810
1
Part No. 135815
0
0
3
6
9
12
15
18
FLOW RATE - GPM
Tests conducted with units in vertical position (lead wires up) with water at
+70°F (21°C).
Visit www.GemsSensors.com for most current information.
G-23
FS-500 Series – Low Cost Units for
Threaded Plastic Piping
File No. E31926
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
FS-500
Series
J-Box with
5-Amp Relay
Polypropylene, Hydrolytically Stable
O-Ring
Spring
Retaining Clip
Operating Pressure, Maximum
Viton® or Buna N
316 Stainless Steel
PH 15-7 Mo Stainless Steel
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)
FLOW SWITCHES
Operating Temperature, Maximum
0° to 212°F (100°C)
Set Point Accuracy
± 20%
Set Point Differential
Switch**
J-Box with 5A Relay
Coil
Contacts SPDT
± 20% Maximum
SPST, N.O. Pilot Duty 20 VA, 120-240 VAC or VDC
Inlet/Outlet Ports
3/4˝ Female NPT
Electric Termination
Pilot
No. 22 AWG, 24˝ Zip Cord Lead Wires
120 VAC 50/60 Hz
5A – 240 VAC Res
1/3 HP – 120 VAC
5A – 28 VDC Res.
J-Box
HOUSING STAYS
IN PIPING
SYSTEM
Dimensions
BONNET
HOUSING
6´ PVC Cable
3.80"
(96.5mm)
* Materials of Construction are available for FDA or NSF Compliance.
** See “Electrical Data” on Page X-5 for more information.
2.00"
(50.8mm)
1.32"
(33.5mm)
1.48"
(37.5mm)
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.
Pressure Drop - Typical
Pilot Duty
J-Box w/5A Relay
0.25
170231
175901
0.50
170232
175902
1.00
170233
—
2.00
175117
—
2.50
170234
—
5.00
170235
—
Part Numbers
5
PRESSURE DROP (PSID)
Switch Actuation
Set Point
GPM
­– Stock Items.
8
1.8"
(45mm)
How To Order – Standard Models
Note: Use of 100 micron filtration is recommended.
BONNET AND
SHUTTLE LIFT
OUT OF HOUSING
BONNET IS
RELEASED
WITH A
COUNTERCLOCKWISE
TWIST
4
Part No. 170235
3
2
Part No. 170231
1
0
0
10 12 14 16 18 20 22 24
FLOW RATE - GPM
Tests conducted with units in vertical position (lead wires up) with
water at +70°F (21°C).
G-24
2
Visit www.GemsSensors.com for most current information.
4
6
8
PADDLE TYPE
Paddle Type Flow Switches – For Flow/
No-Flow Detection in Large Line Sizes
Engineered for positive liquid flow detection at pressures to
2000 PSIG (138 bar)
Contents
Page Start
FS-550 Series
High Pressure, Metal Version................... G-26
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
Typical Applications
Assure flow and/or leak detection in large, high pressure in...
• Compressors • Heat Exchangers • Turbines • Engines • Boilers • Chillers
Protect high or low pressure pumps from cavitation, sense critical, reverse flow and
protect...
• Valves • Pumps • Regulators
Design Data
Simple Installation and Easy Maintenance
General Operating Principle
Installs in a standard pipe tee or reducing fitting. If
excessive particle build-up necessitates occasional
cleaning, simply remove the unit and manually remove
particles actuate paddle for free movement.
HOUSING
AND STEM
ASSEMBLY
Easy Installation
HERMETICALLY
SEALED
SPDT SWITCH
SPRING
.66" (16.7 MM) MAX. HEIGHT
OF BOSS FROM PIPE OR
TEE I.D.; FOR PROPER
OPERATION OF SWITCH,
DO NOT EXCEED .66" (16.7 MM).
PADDLE
AND CAM
ASSEMBLY
De-actuated (no-flow)
Actuated (flow)
1" NPT BOSS
.66" (16.7 MM)
121 "
2"
1
2 2"
3"
Liquid flow in either direction deflects the paddle which, by cam
action, displaces a permanent-magnet-equipped shuttle along the
unit stem. The magnet actuates a hermetically sealed, magnetic
reed switch within the stem to operate a remote alarm or indicator.
FLOW
FLOW SWITCHES
Installs in a standard pipe tee
or reducing fitting.
PERMANENT
MAGNET
SPACER
SHUTTLE
RECOMMENDED PIPE
IS SCHEDULE 40
Paddles Cut-to-Length For Broad Range of Pipe Sizes
Cutting the paddle to length selects a standard flow rate as shown on the tables on the
following pages. Approximate pipe sizes are marked on the paddle. These units can be
used in pipe with diameters greater than the 5˝ paddle length. They provide flow/
no-flow detection where there is a velocity of 0.5 ft. per second.
10"
8"
3"
1 1/4"
Visit www.GemsSensors.com for most current information.
G-25
FS-550 Series – High Pressure, Metal
Paddle Switch
Ro H S
Pipe Line Size: 1-1/4˝ and Up
Primary Construction Material: Stainless Steel or Brass
Setting Type: Fixed
G
EM
®
S CO PLIAN
M
T
Ro H S
G
EM
®
S CO PLIAN
M
T
U.L. Recognized
File No. E31926
CSA Listed —
File No. LR30200
and LR22666
FM Approved —
File No. 0A8A3.AE
and 1H3A2.AX
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.
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 (138 bar)
Pressure Drop
3 PSIG (0.2 bar) Maximum
Operating Temperature
-30°F to + 300°F (-34.4°C to + 148.9°C)
Set Point Accuracy
± 25%
Dimensions
1/2" NPT
Switch*
SPDT, 20 VA
Repeatability
± 5%
Electrical Termination
No. 18 AWG, 24˝ L., Polymeric Lead Wires
3-7/16"
(87.2 mm)
*See “Electrical Data” on Page X-5 for more information.
Standard Actuation and De-actuation Set Points
FLOW SWITCHES
1-11/16"
(42.8 mm)
1" NPT
The Table below indicates paddle lengths which achieve switch actuation for specific
flow rates. Approximate pipe line sizes are marked on paddle.
Short
Paddle Unit
Long
Paddle Unit
Pipe Size
Marked
at Paddle
Cut-Off
Point
1-1/4˝
1-1/4˝
5 (3)
13 (8)
22 (15)
29 (22)
1-1/2˝
—
15 (11)
28 (21)
2˝
—
­—
22 (15)
2-1/2˝
—
—
3˝
—
—
4˝
—
—
Pipe Line Sizes
1-1/2˝
2˝
2-1/2˝
3˝
4˝
1-1/2"
1-1/2" -3"
(LONG)
PADDLE
2"
2-1/2"
3"
—
—
38 (30)
—
—
27 (20)
48 (38)
—
—
21 (14)
40 (26)
52 (39)
—
—
31 (20)
45 (32)
—
—
—
39 (25)
FS-550 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.
LOAD
Select switch type, paddle length and housing material, then specify adjacent part
number.
SPDT
Standard
Unit
Long
Short
Housing
Material
Switch
Operation
Brass
316 S.S.
Brass
N.O.
or
N.C.
316 S.S.
Part Numbers
Standard
3-Pin J-Box
29609
56730
29608
56729
30641
66914
30640
61189
1-1/2"
2"
2-1/2"
3"
VAC
Using GEMS SAFE-PAK
SAFE-PAK
Relays and barriers,
these switches provide
FS-550
automatic flow/no
SWITCH
flow interlock and
HAZARDOUS
are intrinsically-safe
AREA
without explosion-proof
housing and piping.
U.L. Approved — File No. E183854
Note: The FS-550 Switch is not recommended for use with 1˝ plastic tees.
G-26
1"
(25.4 mm)
1"
(25.4 mm)
How To Order – Standard Models
Paddle
Length
1-1/4"
(SHORT)
PADDLE
Approximate Actuation and (De-Actuation) Flow Rates
GPM Water
All flow rate tests for the above table were conducted with the switch installed in a
standard “T” fitting. For calculation of flow rates in pipe sizes larger than 5˝, a flow
velocity of approximately 0.5 ft. per sec. actuates the switch with a full length (5˝ )
paddle. The paddle can be trimmed to achieve different actuation points.
Switch
Type
5-1/2"
(139.7 mm)
1"
Visit www.GemsSensors.com for most current information.

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