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  3. Flowmeters
  4. Flow switches
  5. MFM500A Flow switch

MFM500A Flow switch

Intelligent thermal flow monitoring with real-time accuracy, robust design, and versatile installation for industrial protection.


Key features

  • Temperature compensation
  • OLED screen, switchable display between the progress bar and digital display
  • All stainless steel housing, IP67 protection
  • Many output modes to choose from

About The MFM500A Flow switch

The MFM500A Flow Switch is an intelligent flow monitoring sensor based on the thermal diffusion principle. Utilizing an ARM processing core combined with high-quality sensors and specialized circuitry, this device ensures precise flow measurement, even with fluctuations in water temperature, thanks to its built-in temperature compensation and calibration features.

Real-time flow monitoring and equipment protection

Designed for real-time monitoring of water flow in pipes, the MFM500A is ideal for cooling and lubrication systems. It provides early warnings and protective measures for critical equipment in case of flow faults, helping to prevent damage and downtime.

Durable construction and versatile functionality

The MFM500A features a fully enclosed, stainless steel design, making it suitable for a wide range of environmental conditions. It offers comprehensive protection with overvoltage, over-current, and reverse polarity safeguards. The self-luminous OLED screen allows for easy monitoring, with the option to switch between a progress bar and digital display. Additionally, it supports quick action point settings and features a display inversion function, enabling installation in any direction without the need for frequent adjustments or maintenance.

Ideal for Industrial Applications

This flow switch is perfect for protecting large-scale equipment across various industries, including power generation, metallurgy, steel production, paper manufacturing, and boiler operations. Its robust design and intelligent features make it a reliable choice for ensuring the smooth operation of critical systems.

Do you need this sensor for your next project?

Request a no-obligation quote or send us your contact details for a free, no-obligation consultation. Our sales engineers will then contact you within a maximum of 1 to 2 working days.

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Not exactly what you are looking for? We offer standard sensors, but can also help you with sensors adapted for you or a fully customised measurement solution. Contact us for advice or pricing.

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Technical Specifications

Specification Value
Measure Range 1cm/s~150cm/s (water)
Optimal Range 3cm/s ~ 100cm/s (water)
Power Supply (24±4.8)V DC / 220VAC
Working Current ≤ 60mA
Switch Accuracy ±10cm/s
Hysteresis ±2cm/s~±8cm/s
Initial Time 2s~15s, 8s(typ.)
Switch-off Time 1s~15s, 2s(typ.)
Switch-on Time 1s~13s, 2s(typ.)
Output Signal 1relay\2 NPN\2 PNP\ ; 2PNP+4~20mADC
Output Function NO, NC(optional) 
Relay Characters Switch voltage: ≤ 250V AC / 30V DC; Switch current: ≤3A
Transistors Characters Switch voltage drop: ≤ 1.5V; Switch current: ≤ 400mA
Display OLED indicator, resolution 128×32
Electrical Protection Reverse, short-circuit, over-voltage
Housing Stainless steel
Button PP
Probe Stainless steel
Installation Joint mounting + adaptor
Endurance Pressure 10MPa
Set Button
Electrical Connection M12×1 5-pin plug
Gross weight 265g
Water Temp. -20°C ~80°C
Storage Temp. -30°C ~85°C
Working Temp. -20°C ~70°C
Protection IP67
Temperature Compensation 5°C ~50°C (water)
Electromagnetic Compatibility GB/T17626.2/3-2006, GB/T17626,4-2008
Shock ≤3g (GB/T JJG 882-2004)
Impact ≤ 50g/11ms (GB/T 2423.5-1995)