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Yokogawa UFCH-110*C
Product Overview:
The UFCH-110*C is a clamp-on (non-invasive) ultrasonic flowmeter from Yokogawa’s UFCH series. It measures flow rate by clamping ultrasonic transducers directly onto the outside of a pipe — no pipe cutting, no process shutdown, no pressure drop. It uses the transit-time difference method to measure fluid velocity with high accuracy.
Detailed content
Technical Specifications:
| Parameter | Value |
|---|---|
| Measurement Principle | Transit-Time Difference (Transit-Time Ultrasonic) |
| Pipe Size Range | 15 mm to 300 mm (0.5 inch to 12 inch) OD |
| Pipe Material | Steel, Stainless Steel, Cast Iron, PVC, Copper, FRP, lined pipes (with lining thickness up to 10mm) |
| Fluid Types | Water, wastewater, chemicals, oils, slurries (with sufficient ultrasonic transmission) |
| Flow Velocity Range | 0.01 m/s to 12 m/s (bidirectional) |
| Flow Rate Accuracy | ±1% of reading (at velocity > 0.3 m/s, in clean water), ±1.5% typical |
| Repeatability | ±0.2% of reading |
| Temperature Range (Fluid) | -20°C to +160°C (depending on transducer type) |
| Temperature Range (Transducer) | -40°C to +160°C (standard), up to +200°C (high-temperature version) |
| Pressure Rating | Up to 40 bar (580 psi) — pipe pressure rating dependent |
| Display | 4-line backlit LCD (128 × 64 dots) with 6-button keypad |
| Output Signals | 4-20 mA (isolated, 2-wire), 0-1000 Hz pulse, HART 7, Modbus RTU (RS-485) |
| Power Supply | 24 V DC (typical), 85-265 V AC (optional), or internal rechargeable battery |
| Power Consumption | Approximately 3 W (typical, with 24V DC supply) |
| Battery Life | Approximately 8 hours continuous operation (internal rechargeable Li-ion) |
| Protection Rating | IP67 / IP68 (transducer and transmitter housing) |
| Transducer Material | PPS (Polyphenylene Sulfide) or Stainless Steel 316L (wetted parts) |
| Cable Length (Transducer to Transmitter) | Up to 30 meters (standard), up to 300 meters (with repeater) |
| Data Logging | Internal memory: up to 16,000 data points (flow rate, total, velocity) |
| Communication | HART 7, Modbus RTU (RS-485), pulse output |
| Dimensions (Transmitter) | Approximately 160 mm × 80 mm × 45 mm |
| Weight (Transmitter) | Approximately 0.4 kg (with battery) |
| Weight (Transducer pair) | Approximately 0.2 kg per transducer |
| Certifications | CE, FM, ATEX Zone 2 (optional), IECEx (optional) |
Functional Features:
- Non-invasive installation: Clamps onto existing pipe — zero pipe modification, zero process shutdown, zero pressure drop
- Bidirectional flow measurement: Measures flow in both directions automatically
- Totalizer function: Accumulates total volume with 8-digit display (up to 99,999,999 units)
- Empty pipe detection: Automatically detects and alerts when pipe is empty
- Signal quality monitoring: Real-time display of signal strength, signal-to-noise ratio (SNR), and gain
- Multi-line display: Shows instantaneous flow, total flow, velocity, and signal quality simultaneously
- Data logging: Stores up to 16,000 records for trend analysis without a host system
- HART communication: Enables remote configuration and diagnostics via HART handheld or DCS
Working Principle:
The UFCH-110*C uses two piezoelectric ultrasonic transducers clamped onto the outside of the pipe at an angle. One transducer sends an ultrasonic pulse downstream (with the flow), and the other sends a pulse upstream (against the flow). The transit-time difference between the two pulses is proportional to the average fluid velocity in the pipe. The flowmeter calculates velocity using the formula: V = (L² / (2 × D × cosθ)) × (Δt / t₁ × t₂), where L is the path length, D is the pipe diameter, θ is the transducer angle, and Δt is the transit-time difference. The volumetric flow rate is then: Q = V × A (where A is the pipe cross-sectional area).
Advantages and Highlights:
- Zero pipe penetration — no welding, no hot tapping, no process interruption
- ±1% accuracy — comparable to invasive flowmeters
- Wide pipe size range (15mm to 300mm) — one model covers most applications
- IP67/IP68 rated transducers — suitable for outdoor and submerged installations
- Battery-powered option — enables temporary/portable measurements
- HART and Modbus — full integration with DCS/SCADA systems
- Signal quality monitoring — alerts operator to installation issues before they affect accuracy
Applicable Industries:
- Water and Wastewater Treatment
- Oil and Gas (custody transfer, flare monitoring)
- Chemical Processing
- Power Generation (cooling water, condensate)
- HVAC (chilled water, hot water)
- Food and Beverage (sanitary applications)
- Mining and Minerals (slurry flow)
Installation Requirements:
- Clean the pipe surface at the transducer mounting location — remove paint, scale, and debris
- Apply ultrasonic coupling gel to the transducer face and pipe surface
- Mount transducers at the manufacturer-specified spacing (V-method or Z-method) based on pipe size
- Ensure minimum 10 pipe diameters of straight pipe upstream and 5 diameters downstream (or use flow conditioner)
- Route transducer cables away from high-voltage cables and motors (minimum 300mm separation)
- Connect 4-20 mA output to the DCS/PLC using shielded twisted-pair cable
- For HART communication, connect to a HART loop with 250Ω resistor
Usage Precautions:
- Do not install on pipes with heavy internal scaling, thick lining (>10mm), or severe pitting — signal may not penetrate
- Verify minimum fluid velocity of 0.01 m/s — below this, measurement accuracy degrades significantly
- Do not exceed maximum pipe temperature of 160°C (or 200°C for high-temp version)
- Replace coupling gel periodically (every 6-12 months) to maintain signal quality
- Do not clamp transducers on pipes with external insulation — remove insulation at the mounting point
- Perform zero-point calibration after installation and after any pipe condition change
- Do not use on gases or two-phase flow — the meter is designed for liquids only
