Gems Sensors & Controls FS-600 Specifications
FS-600 Series – No Moving Part, Thermal
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Dispersion Flow Switch
FLOW SWITCHES
Flow Rate Settings: 0.1 GPM to 11 GPM (0.5 LPM to 41 LPM)
Port Size: 1/2˝ to 1-1/2˝ NPT
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
Wetted Materials
Probe 316L Stainless Steel
Flow Body 316 Stainless Steel
Operating Pressure (Max.) 363 PSIG (25 bar)
Operating Temperature -14° F to 140°F (-10°C to 60°C)
Power on Delay Time 15 Seconds Max (Output On)
Response Time 10 Seconds Max.
Inlet/Outlet Ports 1/2˝, 3/4˝, 1˝, 1-1/2˝ NPT
Operating Voltage 24 Vdc or 24Vac +/- 15%
Current Consumption Less than 50mA
Switch Contact Rating 30Vac@45mA, 42Vdc @65mA
Switch Logic Normally Open
Ingress Protection IP65
Set point Accuracy 15%
Set point Differential 20% (Max.)
Electrical Termination M12 x 1 (4-Pin) (1 meter cable included)
Approvals CE, RoHS
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 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.
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.
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How To Order – Flow Switch Only
Specify Part Number based on Fluid Velocity for the
FS-600 Series per the following chart.
Fluid
Velocity
(cm/s)
Notes:
1. Standard calibration is in water with units in a horizontal position.
2. Consult Gems for special applications.
5
10
15
20
25
30
35
40
45
50
55
60
Part Numbers
230500-5-05
230500-5-10
230500-5-15
230500-5-20
230500-5-25
230500-5-30
230500-5-35
230500-5-40
230500-5-45
230500-5-50
230500-5-55
230500-5-60
2.90
(73.7)
0.81
(20.6)
LABEL
Ø0.84
(21.3)
1/2˝-14 NPT
Wiring Diagram
Pin 1 (V+) - red
1 METER
inch
(mm)
Pin 2 (switch) - green
Pin 4 (switch) - yellow
Pin 3 (V-) - blue
G -2
Visit www.GemsSensors.com for most current information.
FS-600 Series / p1of2 / 3-JAN-17
THERMAL DISPERSION TYPE
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0 0
1
2
3
4
5
6
0 10 20 30 40 50 60 70
FLUID VELOCITY (cm/s)
FLOW RATE (GPM)
FLOW RATE (LPM)
5
4.5
3.5
4
3
2.5
1
1.5
2
0.5
0 0
2
4
6
8
10
12
16
14
0 10 20 30 40 50 60 70
FLUID VELOCITY (cm/s)
FLOW RATE (GPM)
FLOW RATE (LPM)
3/4˝ NPT
1˝ NPT
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0 0
1
2
3
4
5
6
0 10 20 30 40 50 60 70
FLUID VELOCITY (cm/s)
FLOW RATE (GPM)
FLOW RATE (LPM)
How To Order – Flow Switch with Fitting
Specify Part Number based on Line Size and Flow Setting per the following chart.
1/2˝ NPT Port 3/4˝ NPT Port 1˝ NPT Port 1-1/2˝ NPT Port
inch
(mm)
2.65
(67.3)
Flow Setting
GPM LPM
0.13 0.48
0.24 0.90
0.35 1.31
0.46 1.73
0.57 2.14
0.68 2.56
0.79 2.98
0.90 3.39
1.01 3.81
1.12 4.23
1.23 4.64
1.34 5.06
Notes:
1. Setpoints based on water flow. Contact factory for setpoints of alternate media.
2. -5 through -60 = fluid velocity (cm/s)
Fluid Velocity vs. Flow Rate in GPM/LPM in Water
1/2˝ NPT Port
1.6
1.4
1.2
1
0.8
0.6
0.4
FLOW RATE (GPM)
0.2
0 0
Cord Set Options — A 1 meter cord set is included with switch
Description Part#
Ø0.703
(17.9)
1/2˝ NPT
1.125
(28.6)
2 PLACES
4.00
(101.6)
Part Numbers
230500-1-05
230500-1-10
230500-1-15
230500-1-20
230500-1-25
230500-1-30
230500-1-35
230500-1-40
230500-1-45
230500-1-50
230500-1-55
230500-1-60
0 10 20 30 40 50 60 70
FLUID VELOCITY (cm/s)
M12 cord Set-1 meter (Red 1, Green 2, Blue 3, Yellow 4) 22 AWG
M12 cord Set-3 meter (Red 1, Green 2, Blue 3, Yellow 4) 22 AWG
M12 cord Set-4 meter (Red 1, Green 2, Blue 3, Yellow 4) 22 AWG
M12 cord Set-5 meter (Red 1, Green 2, Blue 3, Yellow 4) 22 AWG
2.735
(69.5)
1.50 A/F
(38.1)
Flow Setting
GPM LPM
0.35 1.31
0.57 2.15
0.79 2.99
1.01 3.83
1.23 4.67
1.46 5.51
1.68 6.00
1.90 7.00
2.12 8.00
2.34 9.00
2.57 10.00
2.79 11.00
6
5
4
3
2
FLOW RATE (LPM)
1
Ø0.834
(21.2)
3/4˝ NPT
2 PLACES
4.00
(101.6)
Part Numbers
230500-2-05
230500-2-10
230500-2-15
230500-2-20
230500-2-25
230500-2-30
230500-2-35
230500-2-40
230500-2-45
230500-2-50
230500-2-55
230500-2-60
2.75
(69.9)
1.50 A/F
(38.1)
Flow Setting
GPM LPM
0.64 2.20
0.97 3.20
1.31 4.25
1.65 5.30
1.99 6.5
2.32 7.5
2.66 8.5
3.00 9.5
3.33 10.0
3.67 12.0
4.01 13.0
4.34 14.0
3/4˝ NPT and 1˝ NPT Ports
5
4.5
4
3.5
3
2.5
2
1.5
FLOW RATE (GPM)
1
0.5
0 0
0 10 20 30 40 50 60 70
1˝ NPT
3/4˝ NPT
FLUID VELOCITY (cm/s)
557703-01M0
557703-03M0
557703-04M0
557703-05M0
Ø1.066
(27.1)
3/4˝ NPT
2 PLACES
4.00
(101.6)
Part Numbers
230500-3-05
230500-3-10
230500-3-15
230500-3-20
230500-3-25
230500-3-30
230500-3-35
230500-3-40
230500-3-45
230500-3-50
230500-3-55
230500-3-60
1-1/2˝ NPT Port
16
14
12
10
8
6
4
FLOW RATE (LPM)
2
FLOW RATE (GPM)
2.25
(57.2)
Ø1.619
(41.1)
1-1/2˝ NPT
2 PLACES
4.00
(101.6)
Part Numbers
230500-4-05
230500-4-10
230500-4-15
230500-4-20
230500-4-25
230500-4-30
230500-4-35
230500-4-40
230500-4-45
230500-4-50
230500-4-55
230500-4-60
3.00
(76.2)
Flow Setting
GPM LPM
1.48 5.50
2.28 8.5
3.07 11.6
3.86 14.6
4.66 17.6
5.45 20.6
6.0 22.7
7.0 26.5
8.0 30.3
9.0 34.1
10.0 37.9
11.0 41.6
12
10
8
6
4
2
0 0
0 10 20 30 40 50 60 70
FLUID VELOCITY (cm/s)
45
40
35
30
25
20
15
10
5
FLOW SWITCHES
FLOW RATE (LPM)
FS-600 Series / p2of2 / 3-JAN-17
Visit www.GemsSensors.com for most current information.
G-3
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