ZNC-FRC-PB Thermal Flow Switch
The ZNC-FRC-PB Thermal Flow Switch is a high-performance electronic flow monitoring device featuring a unique anti-scaling and anti-tangling design.
Read MoreThe ZNC-FRC-PB Thermal Flow Switch is a high-performance electronic flow monitoring device featuring a unique anti-scaling and anti-tangling design. Built on the thermal dispersion principle, it uses a specialized tapered probe coated with an anti-fouling layer to prevent the buildup of scale, rust, and debris. With no moving parts, it offers maintenance-free operation and a high pressure resistance of up to 100 bar. The fully waterproof housing features an external adjustment knob, allowing for setpoint tuning without disassembling the seal, making it an incredibly reliable and user-friendly solution for harsh industrial environments.
Overview of ZNC-FRC-PB Thermal Flow Switch

The ZNC-FRC-PB Thermal Flow Switch provides real-time monitoring of fluid flow in pipelines with advanced protection against fouling and clogging.
What is it? The ZNC-FRC-PB is an electronic flow switch that monitors liquids and gases. Unlike traditional paddle switches, it has no moving parts. It serves as a safety monitor to detect flow status, flow reduction, or pump idling. It features a 6-LED array to provide immediate visual feedback of the flow velocity status.
Principles of Operation Based on the thermal principle, the sealed probe contains two resistors: one is heated (detection resistance), and the other remains unheated (reference resistance). As the medium flows, heat is carried away from the heated resistor, changing its resistance value. The difference between these two resistors is used to determine the flow rate.
Main Application Field Widely used in petrochemical, electric power, metallurgy, steel mills, papermaking, food processing, water treatment, and battery manufacturing. It is suitable for circulating water, cutting fluids, and lubricating oil monitoring.
Key Characteristics The ZNC-FRC-PB stands out with its unique tapered probe design, which prevents winding or entanglement of debris in the media. The probe's anti-scaling coating effectively resists the attachment of scale and rust. Furthermore, the fully waterproof housing includes a unique external adjustment knob, ensuring the setpoint can be tuned easily while maintaining the IP67 seal.
Features of ZNC-FRC-PB Thermal Flow Switch
Anti-Scaling & Anti-Tangling: Tapered probe design with a specialized coating prevents debris entanglement and mineral buildup, ensuring stable long-term operation.
Maintenance-Free Design: No moving parts to wear out or stick, fundamentally eliminating mechanical failure risks.
Innovative Waterproof Adjustment: Unique waterproof external knob allows for setpoint calibration without opening the housing, preserving the hermetic seal.
High Pressure Resistance: Engineered to withstand demanding industrial conditions with a pressure rating of up to 100 bar.
Real-Time LED Indication: Equipped with a 6-LED display row that provides a direct visual representation of the current flow trend and switch status.
Versatile Integration: Offers multiple output options, including PNP, NPN, and Relay (SPDT) to suit various PLC and control system requirements.
Applications of ZNC-FRC-PB Thermal Flow Switch
Cooling Systems: Monitoring circulating water in steel mills and power plants to prevent equipment overheating.
Pump Protection: Detecting dry-run or low-flow conditions to prevent pump damage in water treatment or chemical lines.
Lubrication and Cutting Fluids: Real-time flow monitoring for CNC machinery and hydraulic systems.
Petrochemical & Metallurgy: Monitoring process media flow in environments where scale or debris is common.
Food and Beverage Processing: Reliable flow detection in processing lines requiring high-durability sensors.
Price of ZNC-FRC-PB Thermal Flow Switch
The price of the ZNC-FRC-PB Thermal Flow Switch varies depending on the specific probe material (304 or 316 Stainless Steel), the chosen output signal, and the required cable configuration. If you would like to know the latest price of the ZNC-FRC-PB Thermal Flow Switch, please contact ZINACA Instruments for a customized quotation based on your technical requirements.
ZNC-FRC-PB Thermal Flow Switch OEM Service
ZINACA Instruments is a professional manufacturer of industrial automation instruments. We provide specialized OEM and customization services for the ZNC-FRC-PB, including custom setpoints, probe lengths, and specialized materials for corrosive media. If you are looking for a reliable partner for anti-fouling flow switch solutions, please contact ZINACA Instruments.
ZNC-FRC-PB Thermal Flow Switch Manufacturer
As a trusted manufacturer, ZINACA Instruments delivers high-quality flow monitoring solutions designed for the toughest industrial environments. Our ZNC-FRC-PB is built to last, featuring IP67 protection and high-precision electronics to ensure safe and stable performance across the metallurgy, power, and chemical industries.
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-PB Thermal Flow Switch is a high-performance electronic flow monitoring device featuring a unique anti-scaling and anti-tangling design.
Read MoreThe ZNC-FRC-C PTFE Thermal Flow Switch is a high-performance flow monitoring device specifically engineered for highly corrosive environments.
Read MoreThe ZNC-FRC-FT is an advanced, multi-functional thermal dispersion monitoring device that combines flow velocity detection and temperature measurement into a single, compact unit.
Read MoreThe ZNC-FRC-EXT is a specialized explosion-proof thermal flow switch engineered to handle the most challenging industrial conditions, including high-temperature environments (up to 300°C) and high-viscosity media.
Read MoreNo. 12, Within Waihuan Industrial Company Compound, Fujin Road, Zhongbei Town, Xiqing District, Tianjin, China