Master Catalog — Gems Sensors & Controls - G-2

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

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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

316L 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
24 Vdc or 24Vac +/- 15%
Less than 50mA
30Vac@45mA, 42Vdc @65mA
Normally Open
IP65
15%
20% (Max.)
M12 x 1 (4-Pin) (1 meter cable included)
CE, RoHS

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)

Part Numbers

230500-5-05

Calorimetric Principle/Thermal Dispersion

230500-5-10

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.

230500-5-15

230500-5-20

230500-5-25

230500-5-30

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.

230500-5-35

230500-5-40

230500-5-45

230500-5-50

230500-5-55

230500-5-60

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.

LABEL

1 METER

2.90
(73.7)

0.81
(20.6)

1/2˝-14 NPT

Ø0.84
(21.3)

inch
(mm)

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.

FS-600 Series / p1of2 / 3-JAN-17

http://www.GemsSensors.com

Master Catalog — Gems Sensors & Controls

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