ZNC-FRC-PY Thermal Flow Switch
The ZNC-FRC-PY Thermal Flow Switch is a compact and reliable electronic monitoring device designed for precise flow control in industrial pipelines.
Read MoreThe ZNC-FRC-PY Thermal Flow Switch is a compact and reliable electronic monitoring device designed for precise flow control in industrial pipelines. Built on the thermal dispersion principle, it features a "no moving parts" design that fundamentally eliminates mechanical wear and clogging. This switch is highly versatile, with a single model being compatible with various pipe diameters and media types, including water, oil, and gas. With its IP67 protection, 100 bar pressure resistance, and clear LED status display, the ZNC-FRC-PY provides an efficient and maintenance-free solution for protecting pumps and monitoring cooling circuits.
Overview of ZNC-FRC-PY Thermal Flow Switch

The ZNC-FRC-PY Thermal Flow Switch is a smart electronic instrument designed for real-time monitoring and control of liquid and gas flow status.
What is it? The ZNC-FRC-PY is an advanced flow monitor that triggers a switching signal (PNP, NPN, or Relay) based on the flow velocity of the medium. It is a compact, robust alternative to mechanical paddle switches, offering much higher reliability and a longer service life because it has no moving parts to break or get stuck.
Principles of Operation Based on the thermal principle, the sealed probe contains two resistors: one is heated as the detection resistance, and the other remains unheated as the reference resistance. When the medium flows, heat from the heated resistor is carried away, changing its resistance value. The difference between the two resistance values is then used as the basis for judging the flow rate.
Main Application Field: This product is widely used in industrial automation, cooling systems, and hydraulic machinery. It is specifically designed to monitor circulating water, cutting fluids, and lubricating oils to prevent equipment damage due to flow cut-off or pump dry-running.
Key Characteristics The device is characterized by its compact structure and extremely low pressure loss. It features a 6-LED display row to show flow trends and switch status in real-time. With its POM engineering plastic housing and stainless steel probe, it provides excellent durability and IP67-rated protection against harsh environments.
Features of ZNC-FRC-PY Thermal Flow Switch
Maintenance-Free Design: No moving parts to wear out, ensuring high reliability and a long service life without the need for periodic cleaning or mechanical adjustment.
Compact and Versatile: A single model can be adapted to various pipe diameters, making it easy to integrate into existing systems with minimal space requirements.
High Pressure Resistance: Robust construction allows the switch to operate safely in high-pressure environments up to 100 bar.
Visual Status Monitoring: Features a 6-LED array that provides immediate feedback on the current flow velocity trend and the status of the switch output.
Continuously Adjustable Setpoints: The switching point can be easily and continuously adjusted via an onboard potentiometer to meet specific process requirements.
Robust Electrical Protection: Built-in safeguards against reverse polarity, short circuits, and overloads ensure the electronics remain stable during operation.
Applications of ZNC-FRC-PY Thermal Flow Switch
Cooling Water Monitoring: Ensuring constant flow for water-cooled machinery, welding equipment, and induction furnaces.
Pump Dry-Run Protection: Detecting flow loss in suction or discharge lines to prevent expensive pump motor and seal damage.
Lubrication Systems: Monitoring the flow of lubricating oils in gearboxes and large industrial bearings.
Hydraulic Systems: Providing flow status signals for hydraulic power units and control loops.
Flow Cut-off Detection: Acting as a safety interlock in pipelines carrying gas or liquid media to ensure process continuity.
Price of ZNC-FRC-PY Thermal Flow Switch
The price of the ZNC-FRC-PY Thermal Flow Switch varies depending on the specific probe material (304 or 316 stainless steel), the required signal output type, and the connection thread. Product prices will change based on the actual parameters selected. If you would like to know the latest ZNC-FRC-PY price, please contact ZINACA Instruments at any time to receive a customized quotation.
ZNC-FRC-PY Thermal Flow Switch OEM Service
ZINACA Instruments is a professional industrial instrument manufacturer. We provide comprehensive OEM and customization services for the ZNC-FRC-PY, allowing for tailored probe lengths and specialized settings to meet your specific industrial conditions. If you are looking for a reliable partner for compact thermal flow switches, please contact ZINACA Instruments for professional support.
ZNC-FRC-PY Thermal Flow Switch Manufacturer
As a trusted manufacturer, ZINACA Instruments provides high-quality, durable flow monitoring solutions. Our ZNC-FRC-PY model is engineered for stability and precision, serving the petrochemical, metallurgy, and power industries worldwide with reliable flow protection.
Technical Parameters
| Setting Range | 1…150 cm/s (water), 3…300 cm/s (oil), 20…2000 cm/s (air) |
|---|---|
| Signal Output | PNP, NPN, Relay (SPDT) |
| Power Supply | 24V ±20% DC |
| Switching Current | Max 400mA (PNP/NPN), Max 1A @ 48VAC/DC (Relay) |
| Flow Indication | 6-LED Array |
| Setting Method | Potentiometer (External knob) |
| Pressure Resistance | 100 bar |
| Response Time | 1…13 s (Typical 2 s) |
| Protection Class | IP67 |
| Medium Temperature | -20 to 90 °C |
| Materials | Probe: 304/316 Stainless Steel; Housing: POM (Engineering Plastic) |
| Wiring | M12 Connector |
| Repeatability | ±2% |
The ZNC-FRC-PY Thermal Flow Switch is a compact and reliable electronic monitoring device designed for precise flow control in industrial pipelines.
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Read MoreNo. 12, Within Waihuan Industrial Company Compound, Fujin Road, Zhongbei Town, Xiqing District, Tianjin, China