Piston Flow Switch for liquid and gas flow monitoring

Piston Flow Switch

The Piston Flow Switch is an inline mechanical switch for liquid or gas media, featuring a robust plastic, aluminum, or stainless steel housing. It offers minimal pressure loss, excellent repeatability, and full mechanical-electrical isolation. Pre-set switch calibration and LED indicators simplify installation, while optional dual outputs provide flexible monitoring. Ideal for small-flow applications in industrial automation, machinery, compressed air systems, refrigeration, and HVAC.

Setpoint Range: See parameter table
Accuracy: ±5% of full scale
Hysteresis: Depends on switch, typically 0.5 L/min for small flows
LED Indicator: DC-powered LED shows switch status; AC version has no LED
Output: Reed switch, rated 24 VDC / 250 VAC, 100 mA
Pressure Rating: 50 bar (aluminum), 100 bar (stainless steel)
Average Pressure Loss: 0.3 bar (at 25 L/min)
Medium Temperature: Max. 90℃
Enclosure Protection: IP65

Description

Overview of Piston Flow Switch

The Piston Flow Switch is a compact inline mechanical flow switch designed for monitoring liquid or gas flow in industrial pipelines. Featuring a durable plastic, aluminum, or stainless steel housing, it provides minimal pressure loss, excellent repeatability, and complete isolation between mechanical and electrical components. With optional LED indicators and pre-calibrated switch settings, this flow switch ensures reliable operation and simple installation, making it ideal for small-flow applications in industrial automation, compressed air systems, and HVAC control.

Features of Piston Flow Switch

Inline mechanical flow switch for liquid and gas media
Durable housing available in plastic, aluminum, or stainless steel
Minimal pressure loss and excellent repeatability
Full mechanical-electrical isolation for long-term reliability
Pre-calibrated setpoint—no on-site adjustment required
LED status indicator (DC models) for easy monitoring
Optional dual switch outputs for flexible control
Compact and economical design suitable for small flow ranges
Pressure rating up to 100 bar, suitable for demanding conditions
IP65 protection, ensuring performance in harsh environments

Applications of Piston Flow Switch

Industrial automation: Monitoring flow in machinery and process equipment
Compressed air systems: Detecting air or gas flow for control and safety
Refrigeration and HVAC: Ensuring proper coolant circulation
Pump and circuit protection: Preventing dry running or flow loss
Small-flow monitoring in chemical, water treatment, and general industry pipelines

Price of Piston Flow Switch

The price of a Piston Flow Switch varies depending on actual parameters such as material, pressure rating, and configuration.
If you would like to know the latest price of ZINACA Instruments’ Piston Flow Switch, please contact us for a detailed quotation.

Piston Flow Switch OEM Service

ZINACA Instruments is a professional manufacturer of industrial automation instruments.
We can customize reliable Piston Flow Switches according to your specific requirements and operating conditions.
If you are looking for Piston Flow Switch OEM Service, please feel free to contact us.

Piston Flow Switch Manufacturer

As a leading Piston Flow Switch manufacturer, ZINACA Instruments provides high-quality flow monitoring solutions for global industries including HVAC, water treatment, chemical processing, and automation systems.
Our products are certified to ISO 9001, CNAS, IAF, SIL, and ACM standards, ensuring durability, precision, and international reliability.

Technical parameters

Parameter	Specification
Set Range	See parameter table
Accuracy	±5% of full scale
Hysteresis	Depends on switch; minimum 0.5 L/min
Switch Setting Scale	Calibrated with water at 20°C, horizontal installation. Position, medium, and temperature changes may slightly affect switch value
LED Display	DC: LED indicates switch status; AC: no LED
Connection	Plug-in connector
Output	Reed switch, 24 VDC / 250 VAC, 100 mA
Pressure Resistance	50 bar (aluminum), 100 bar (stainless steel)
Average Pressure Loss	0.3 bar (at 25 L/min)
Medium Temperature	Max. 90°C
Protection Rating	IP65

Material Options

Model	Housing	Piston	Spring	Seal
ZNC-HS100GS	POM plastic	POM plastic / stainless steel	Stainless steel	NBR
ZNC-HS100GL	Anodized aluminum	POM plastic / stainless steel	Stainless steel	NBR
ZNC-HS100GB	Stainless steel	POM plastic / stainless steel	Stainless steel	NBR

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