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Thermal Flow Switch

ZNC-FRC-D Digital Thermal Flow Switch

MODEL: ZNC-FRC-D

The ZNC-FRC-D Digital Thermal Flow Switch is an intelligent, high-precision monitoring device designed for the real-time detection and control of fluid flow. Unlike traditional mechanical switches, the ZNC-FRC-D features a 4-digit LED digital display and a fully electronic, no-moving-parts design based on the thermal dispersion principle. This ensures a wear-free, maintenance-free service life even in demanding industrial environments. With integrated PNP, NPN, Relay, and 4-20mA analog outputs, it provides both switching control and continuous flow trend monitoring for water, oil, and gas media.

  • Wide flow detection range: 1…300 cm/s (water), 3…300 cm/s (oil), 20…2000 cm/s (air)

  • Flexible outputs: PNP, NPN, relay, 4…20mA analog output, NO+NC (SPDT)

  • Robust design: Pressure resistance up to 50 bar

  • High temperature capability: -20…70°C medium temperature

  • Fast response: Typical response time ~2s, initialization ~8s

  • Durable housing: Stainless steel probe and housing

  • Reliable protection: IP67, with reverse polarity, short-circuit, and overload protection


Description

Overview of ZNC-FRC-D Digital Thermal Flow Switch

The ZNC-FRC-D Digital Thermal Flow Switch is a versatile and intelligent device for monitoring and controlling the flow of liquids and gases in industrial pipelines.

  • What is it? Equipped with a high-brightness digital display, the ZNC-FRC-D provides real-time flow indication and allows for easy on-site adjustment of process parameters via a keypad. It serves as an advanced electronic alternative to mechanical switches, offering much higher accuracy and a 50 bar pressure rating.

  • Principles of Operation The device operates on the thermal (calorimetric) principle. The sealed stainless steel probe contains a heated resistor and a reference resistor. As the medium flows past, it carries away heat from the heated resistor. The microprocessor calculates the flow velocity based on the resistance change and displays the results digitally while managing the switch and analog outputs.

  • Main Application Field: It is widely used in industrial systems to monitor circulating water, cutting fluids, and lubricating oils. It is a critical component in pneumatic and hydraulic systems, providing reliable flow cut-off detection and dry-run protection for high-value pumps.

  • Key Characteristics The most prominent features are the no-moving-parts design and the integrated 4-digit LED display. It is compact, robust, and rated at IP67. The ZNC-FRC-D offers a wide detection range and multiple output configurations, allowing a single model to fit various pipe diameters and control requirements.


Features of ZNC-FRC-D Digital Thermal Flow Switch

  1. Real-Time Digital Visualization: Features a 4-digit LED display that shows flow trends and switch status, enabling operators to monitor system health at a glance.

  2. Maintenance-Free and Wear-Free: The thermal dispersion design eliminates mechanical components, fundamentally preventing sticking, clogging, or mechanical fatigue.

  3. Multi-Signal Output: Provides highly flexible output options including PNP, NPN, Relay (SPDT), and a 4-20mA analog signal for continuous monitoring.

  4. User-Friendly Configuration: Easy keypad setting allows for the continuous adjustment of switching points and delay times without the need for external tools.

  5. Robust Industrial Build: Constructed with a stainless steel probe and housing, capable of withstanding pressures up to 50 bar and protecting against harsh environmental conditions (IP67).

  6. Fast Response and High Reliability: Offers a typical response time of 2 seconds and includes full electrical protection against reverse polarity, short-circuits, and overloads.


Applications of ZNC-FRC-D Digital Thermal Flow Switch

  • Pump Dry-Run Protection: Automatically shuts down pumps if fluid flow is lost, preventing catastrophic seal and motor damage.

  • Cooling System Monitoring: Ensures constant flow in water-cooled industrial machinery, welding equipment, and laser systems.

  • Hydraulic and Lubrication Systems: Monitoring the flow of lubricating oils and cutting fluids to maintain optimal operating conditions.

  • Process Media Control: Detecting flow cut-off or leakage in pipelines carrying gas or liquid media in the chemical and machinery industries.

  • Automation Integration: Using the 4-20mA analog output to provide flow trend data to PLCs or DCS for advanced process automation.


Price of ZNC-FRC-D Digital Thermal Flow Switch

The product price may vary depending on specific parameters such as the required output type (e.g., analog vs. relay), probe length, and connection materials. If you want to know the latest price of ZINACA Instruments’ ZNC-FRC-D Digital Thermal Flow Switch, please feel free to contact us for a customized quotation.


ZNC-FRC-D Digital Thermal Flow Switch OEM Service

ZINACA Instruments is a professional industrial instrument manufacturer specializing in pressure, temperature, flow, and level measurement devices. We provide customized OEM solutions for the ZNC-FRC-D Digital Thermal Flow Switch according to your specific requirements and operating conditions. If you are seeking professional OEM services for intelligent digital flow switches, please contact ZINACA Instruments.


ZNC-FRC-D Digital Thermal Flow Switch Manufacturer

ZINACA Instruments is a trusted Digital Thermal Flow Switch manufacturer. We are certified with ISO 9001, CNAS, IAF, SIL, and ACM, ensuring that our products meet the highest international standards for quality and reliability. Our switches deliver safe and stable performance across the oil and gas, chemical, metallurgy, power, and machinery industries.


Technical Parameters

ParameterSpecification
Flow detection range1…300 cm/s (water), 3…300 cm/s (oil), 20…2000 cm/s (air)
Signal outputPNP, NPN, Relay, 4…20mA analog output, NO+NC (SPDT)
Power supply24V ±20% DC
Switching currentMax. 400mA (PNP or NPN type), Max. 3A (Relay type)
No-load currentMax. 80mA
Flow indication4-digit digital display
Setting methodKeypad setting
Pressure resistance50 bar
Temperature gradient≤4℃/s
Response time1—13s, typical 2s
Initialization time8s
Electrical protectionReverse polarity, short-circuit, overload protection
Protection classIP67
Medium temperature-20…70℃
Ambient temperature-20…60℃
Storage temperature-20…60℃
Connection typeM12 connector / optional 2m cable
MaterialProbe: Stainless steel; Housing: Stainless steel
Weight0.6 kg
Repeatability±2% of measured value

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Tianjin ZINACA Intelligent Equipment Co., LTD

Location

No. 12, Within Waihuan Industrial Company Compound, Fujin Road, Zhongbei Town, Xiqing District, Tianjin, China

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+8617320288925

WhatsApp Email +8617320288925