Piston Flow Switch SI-210

Piston flow switches are used for flow control of liquids, gases and oils. The housing material of the piston flow switch: plastic, stainless steel and aluminum are optional. Sino-Inst’s piston flow switch supports customization and OEM.

Inline installation: Direct connection to the pipeline
Mechanical flow switch
For liquid or gaseous media.
Material options: Plastic, aluminum or stainless steel housing optional
Minimal pressure loss
Good repeatability
Strong anti-fouling ability
Complete isolation of mechanical and electronic parts
Economical for small flow
With switch setting scale
LED display switch status
Dual switch output is optional

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Piston Flow Switch Introduction

The piston flow switch contains a magnetic piston. Piston is supported by a precision spring inside, which pushes the piston to move backward. The magnetic piston triggers an external micro switch or reed switch. The pointer flow meter head can be optionally equipped to display the instantaneous flow.When measuring, it is a sensor device that converts water flow into a switch-type electrical signal when a certain flow rate is reached. The DC power supply LED displays the switch status, and the AC has no LED display. It can prevent idling and dry burning.

In engineering projects, we often encounter some installed target flow switches. Due to the large water flow resistance, many users have to replace it with other flow switches during debugging. Target flow switches usually rust and have a short service life. Therefore, in this case, if the pipe size is small, it is recommended that users choose a piston flow switch.

Piston Flow Switch Parameters

Setting range	See the parameter table for details
Accuracy	±5% total range
Hysteresis	Depending on the switch point, the minimum amount is 0.5L/min
Switch the scale setting	The calibration is carried out when the medium is water, the temperature is 20℃, and the horizontal installation state is used.
Installation position	The medium and temperature changes will slightly affect the switch value.
Wiring method	M12 5-pin connector, Hirschmann connector optional.
LED display	DC power supply LED displays the switch status, AC has no LED display
Output	Reed switch, capacity 24VDC/250VAC, 100mA
Withstand pressure	50bar (aluminum type), 100bar (stainless steel type)
Average pressure loss	0.3bar (at 25L/min)
Medium temperature	Maximum 90℃
Protection level	IP65

Anodized aluminum (stainless steel)
Model	Pressure ( bar)	Maximum flow rate L/min (water)	Adjustable range L/min (water)	G(mm)	L	H	B	X	Weight (kg)
Model	Pressure ( bar)	Maximum flow rate L/min (water)	Adjustable range L/min (water)	G(mm)	mm	mm	mm	mm	Weight (kg)
210-G14…L010	50	40	0.6(0.1)..8(7)	G1/4	93	36	30	12	0.22(0.53)
210-G38…L010	50	40	0.6(0.1)..8(7)	G3/8	93	36	30	15	0.20(0.51)
210-G12…L010	50	40	0.6(0.1)..8(7)	G1/2	93	36	30	15	0.18(0.48)
210-G34…L010	50	40	0.6(0.1)..8(7)	G3/4	105	36	35	15	0.23(0.65)
210-G1…L010	50	60	0.6(0.1)..8(7)	G1	105	36	40	15	0.32(0.82)
210-G14…L015	50	40	1(0.5)..15(13)	G1/4	93	36	30	12	0.22(0.53)
210-G38…L015	50	40	1(0.5)..15(13)	G3/8	93	36	30	15	0.20(0.51)
210-G12…L015	50	40	1(0.5)..15(13)	G1/2	93	36	30	15	0.18(0.48)
210-G34..L015	50	40	1(0.5)..15(13)	G3/4	105	36	35	15	0.23(0.65)
210-G1…L015	50	60	1(0.5)..15(13)	G1	105	36	40	15	0.32(0.82)
210-G12…L028	50	40	2(0.8)..28(25)	G1/2	93	36	30	15	0.18(0.48)
210-G34..L028	50	60	2(0.8)..28(25)	G3/4	105	36	35	15	0.23(0.65)
210-G1…L028	50	40	2(0.8)..28(25)	G1	105	36	40	15	0.32(0.85)
210-G34…L070	50	100	27(21)..70(66)	G3/4	105	36	35	15	0.23(0.65)
210-G1…L070	50	100	27(21)..70(66)	G1	105	36	40	15	0.32(0.82)
Note: ① The parameters in the brackets are the reset points. ② The parameters outside the brackets are the action points. ③ If the lower limit alarm (monitoring flow is too small), refer to the reset point parameters; if the upper limit alarm (monitoring flow is too large), refer to the reset point parameters. ④ The above parameters are obtained by installing the switch vertically in a horizontal pipeline and testing with 20°C water medium.

Note： Incorrect installation may lead to inaccurate measurement results

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Sino-Inst’s piston flow switches support customization and OEM. Sino-Inst is a supplier of various measuring instruments. If you have any measurement questions, please contact us immediately. Our professional engineers will answer your questions at any time.

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Piston Flow Switch Applications

Industrial Automation
Mechanical Equipment
Air Compressor Industry
Refrigeration and Air Conditioning
Water Pump Idle Protection
Cooling Water
Lubricating Oil Monitoring
Water System Water Circulation Control
Inlet and Outlet Control
Water Heating Control
Water Pump Switch Control
Solenoid Valve On-Off Control
Water Outlet Power Off
Water Outlet Power On

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How does a Piston Flow Switch Work?

The design of the piston flow switch makes the free-floating magnetic piston respond to the flow in the pipeline. The piston flow switch contains a precision spring-supported magnetic piston that pushes the piston backward. The magnetic piston triggers an external micro switch or reed switch. When flow increases or decreases, the movement of the piston actuates a sealed reed switch, triggering a specified action.

What is the Output of a Flow Switch?

Analog Current: Analog current levels (transmitters), such as 4 – 20 mA, are suitable for sending signals over long distances. The current on the output circuit is proportional to the measurement. Feedback is used to provide the appropriate current regardless of line noise and impedance

Analog Voltage: Analog voltage outputs are simple and usually a linear function of the measurement

Frequency: Frequency or modulated frequency outputs include amplitude modulation (AM), frequency modulation (FM), sine waves, and pulse trains.

Switch: The output is a change in the state of a switch or relay. If the process reaches a pre-established threshold, the flow switch will open or close to maintain proper function of the system.