Magnetic Clamp-On Flow Meter | Quick Mount Small Pipe Sensor | FHM500
The FHM500 Flow Watch Magnetic Clamp-On Flow Meter is the ultimate tool for fast, non-intrusive flow measurement on small-diameter lines. Designed with a revolutionary magnetic quick-mounting bracket, the FHM500 can be fully installed in just 2 to 3 minutes without tools, external sensor cables, or pipe modifications.
Featuring a crisp OLED display and a compact single-body footprint, this all-in-one meter measures liquid flow on pipe outer diameters ranging from 9.53mm to 90mm. It is the ideal choice for facility maintenance technicians, equipment integrators, and plant engineers needing rapid sub-metering and quick flow balancing.
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Key Highlights:
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Magnetic Quick-Mount Bracket: Secure 2-to-3-minute setup with no external transducer cables.
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Small-Pipe Specialization: Fits pipe outer diameters from 9.53mm to 90mm (approx. 3/8″ to 3.5″).
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Compact All-in-One Design: Integrated sensor body with high-contrast OLED display.
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Built-in Totalizer: Tracks daily and monthly flow volume directly on the device.
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Non-Invasive: Zero pipe cutting, zero pressure drop, zero risk of leaks or contamination.
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Description
Rapid Small-Pipe Sub-Metering Without Cable Clutter
Traditional clamp-on flow meters for small pipes often require mounting separate transducers, routing delicate signal cables back to a wall box, and configuring complex parameters. The FHM500 Flow Watch streamlines this entire process into a single, compact device.
By housing the ultrasonic sensors, signal processing unit, and OLED screen inside a single rugged enclosure, the FHM500 clamps directly onto small fluid lines using a heavy-duty magnetic latching mechanism. It delivers instant, high-accuracy readings in minutes—making temporary spot-checks or permanent sub-metering easier than ever.
Designed for Facility Balancing & OEM Equipment Integration
In modern facilities, small lines feeding HVAC chillers, machine tool cooling circuits, hydraulic systems, and chemical dosing lines require frequent verification. The FHM500 allows technicians to diagnose flow imbalances rapidly without breaking pipe connections or stopping production.
Primary Applications
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Facility Maintenance & Flow Balancing: Rapid diagnostic checks on small distribution lines, fan coil units, and heat exchangers.
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OEM Equipment Monitoring: Integrated flow monitoring for industrial machinery, laser chillers, and cooling skids.
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Pure & Chemical Fluid Lines: Non-contact measurement for DI water, cooling water, light oils, and mild liquid chemicals.
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Commercial Sub-Metering: Individual line tracking for tenant spaces, server room cooling racks, and secondary water loops.
Features
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Magnetic Quick-Mounting System: Snaps onto small pipes securely within 2 to 3 minutes, drastically cutting installation labor.
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Cable-Free Sensor Integration: Transducers are built into the main clamp body, eliminating external transducer cables, coupling grease hassles, and loose wiring.
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High-Contrast OLED Display: Clear, bright screen provides immediate visibility of instantaneous flow rate and cumulative totals, even in dimly lit equipment rooms.
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Comprehensive Flow Tracking: Features integrated daily and monthly volume totalizers for precise consumption reporting and leak detection.
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Broad Small-Pipe Range: Accommodates outer diameters from 9.53mm up to 90mm across metal and plastic piping materials.
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Flexible Signal Outputs: Equipped with digital RS485 (Modbus RTU) and analog/pulse outputs for easy hookup to building automation systems (BAS) or local PLCs.
Specification
| Parameter | Technical Specification |
| Model | FHM500 (Flow Watch) |
| Measurement Principle | Transit-time ultrasonic clamp-on |
| Pipe Outer Diameter (OD) | 9.53 mm to 90 mm (3/8″ to 3.5″) |
| Installation Method | Quick-latch magnetic mounting bracket (2-3 min setup) |
| Display | High-contrast OLED display |
| Velocity Range | ±0.1 m/s to ±5.0 m/s |
| Applicable Pipe Materials | Stainless steel, copper, carbon steel, PVC, PPR, plastic tubes |
| Applicable Liquids | Water, chilled water, DI water, light oils, homogeneous fluids |
| Totalizer Functions | Built-in Daily, Monthly, and Cumulative totalizers |
| Outputs / Communications | RS485 (Modbus RTU), OCT Pulse / Analog Output |
| Enclosure Construction | Compact, high-impact industrial housing |
| Operating Temperature | Medium: 0°C to 85°C |
FAQ
Q1: How long does it take to install the FHM500 Flow Watch?
Installation typically takes only 2 to 3 minutes. Thanks to its integrated magnetic clamping mechanism, you simply position the bracket around the pipe, latch it, and power the unit up—no need to wire external sensor heads or apply messy acoustic grease blocks.
Q2: How does the FHM500 differ from the FMU833 or FHS300 wall-mount units?
The FMU833 and FHS300 are designed for larger pipelines (up to DN6000 and DN1200 respectively) using remote wall-mounted electronics and long transducer cables. The FHM500 is a compact, single-piece meter specifically engineered for fast, cable-free mounting on small pipes (9.53mm to 90mm OD).
Q3: Does the FHM500 require cutting or modifying the pipe?
No. The FHM500 is 100% non-intrusive. It clamps onto the outside of the pipe wall, meaning zero process downtime, zero line cutting, and zero risk of fluid contamination.
Q4: Can the FHM500 track cumulative water usage over time?
Yes. The FHM500 includes built-in daily and monthly totalizers visible directly on its OLED screen, making it ideal for checking daily water consumption, sub-metering specific machinery, or auditing system efficiency.
