Description
YF-W200D Explosion-Proof Transit-Time Ultrasonic Flow Meter
Fixed wall-mount Ex converter for hazardous-area liquids · ±1% accuracy · DN15–DN6000 · clamp-on or insertion transducers · RS485 Modbus, 4–20 mA, pulse & relay
- ⚠️ Ex explosion-proof enclosure
- Factory-direct wholesale & OEM
- No pressure drop, non-intrusive option
- Heat/BTU energy measurement
- Worldwide export support
The YF-W200D is a fixed, wall-mounted transit-time ultrasonic flow meter housed in an explosion-proof (Ex) enclosure. It is engineered for classified and demanding industrial environments — petrochemical, oil and gas, chemical, pharmaceutical and solvent plants — where flammable atmospheres, aggressive fluids and continuous, reliable measurement are the norm. Using two ultrasonic transducers, it measures the difference in transit time of sound pulses traveling with and against the flow, calculating velocity, flow rate and totalized volume without an obstruction in the pipe. Choose externally mounted clamp-on transducers for zero shutdown and zero pressure drop, or the stainless insertion / pipe-section transducer assembly for lined, high-solids or difficult applications.
Key features
- ±1% accuracy with low-voltage, multi-pulse transit-time technology for long-term stability and reliability.
- Wide range: DN15 to DN6000 mm across steel, stainless steel, cast iron, copper, cement, PVC, aluminum and fiberglass, lined pipes included.
- Explosion-proof Ex enclosure with sealed cable glands for safe installation in hazardous areas.
- Strong anti-interference: dual-balance differential signal receiver/driver circuit resists noise from variable-frequency drives, TV/radio transmitters and high-voltage lines.
- Powerful data logging: totalizer for the last 512 days / 128 months / 10 years; the last 64 power on/off events with time and flow rate; and 32 days of working status.
- Heat/energy measurement when paired with Pt100 temperature transducers.
- Optional SD card memory for extended local data storage.
Why buyers choose the YF-W200D
Hazardous-area safe
The Ex enclosure is purpose-built for zones where ordinary instruments cannot be installed.
Non-intrusive measurement
Clamp-on mounting means no tapping, no shutdown, no pressure drop and no wetted moving parts.
Process & energy in one unit
Measure flow and, with Pt100 inputs, heat/BTU energy simultaneously.
Easy integration
4–20 mA, OCT pulse, relay and isolated RS485 Modbus connect directly to PLC/SCADA systems.
Technical specifications
| Principle | Transit-time ultrasonic flow measurement |
|---|---|
| Accuracy | ±1% of reading |
| Display | 2 × 20 character backlit LCD (Chinese / English / Italian) |
| Analog output | 1 × 4–20 mA (load 0–1 kΩ, 0.1% accuracy) |
| Pulse output | 1 × OCT isolated pulse (pulse width 6–1000 ms, default 200 ms) |
| Relay output | 1 × relay |
| Analog input | 3 × 4–20 mA for temperature, pressure and level |
| Energy measurement | Pt100 temperature transducers for heat/BTU energy metering |
| Communication | Isolated RS485, Modbus RTU; PC software upgrade |
| Transducer cable | Twisted-pair up to 50 m; RS485 option over 1000 m |
| Pipe materials | Steel, stainless steel, cast iron, copper, cement, PVC, aluminum, fiberglass; lined pipes allowed |
| Pipe diameter | DN15 – DN6000 mm |
| Straight pipe requirement | Upstream 10D, downstream 5D; 30D from pump |
| Liquids | Water, hot/chilled/city water, seawater, wastewater, low-particle sewage, crude/lubricating/diesel/fuel oil, alcohols & chemicals, plant effluent, beverages, ultra-pure liquids |
| Fluid temperature | -30 °C – +160 °C |
| Turbidity / solids | Up to 10,000 ppm with low gas/bubble content |
| Flow velocity range | 0 – ±7 m/s |
| Ambient temperature | Converter -20 °C – +60 °C; transducer -30 °C – +160 °C |
| Humidity | Converter 85% RH; transducer submersible to 2 m depth |
| Protection / enclosure | Explosion-proof Ex enclosure, wall-mount fixed converter |
| Power supply | DC 8–36 V or AC 85–264 V (optional) |
| Power consumption | 1.5 W |
Typical applications
- Petrochemical and oil & gas — crude oil, fuel oil, diesel and lubricating oil transfer and batching
- Chemical and pharmaceutical plants — solvents, alcohols and process chemicals in classified zones
- Industrial water & wastewater — process water, cooling water, effluent and low-particle sewage
- Power and district energy — hot/chilled water flow and thermal energy submetering
- Food & beverage and ultra-pure liquids where non-contact measurement is preferred
How to get a price — 3 simple steps
- Send your pipe size, wall thickness, material/liner, fluid, temperature, pressure and hazardous-area classification.
- Our engineers confirm clamp-on vs insertion transducers and the correct configuration.
- You receive an English quotation with factory-direct wholesale/OEM pricing and lead time.
Frequently asked questions
What is an explosion-proof (Ex) ultrasonic flow meter used for?
The YF-W200D is built for hazardous-area industries such as petrochemical, oil & gas, chemical dosing and solvent handling, where flammable gases or vapors may be present. The sealed Ex enclosure contains any internal spark so it cannot ignite the surrounding atmosphere. It measures flow by transit-time ultrasound without contacting or obstructing the process fluid.
Does the YF-W200D contact the liquid, and can it be installed without shutting down the line?
Two transducer arrangements are supported. Clamp-on transducers mount on the outside of the pipe and require no shutdown, tapping or pressure drop. For high-solids, lined or difficult pipes, an insertion / pipe-section stainless transducer assembly (as shown in the product photos) can be used. Your application note tells us which we recommend.
How accurate is the YF-W200D and what pipe sizes does it cover?
It provides ±1% of reading on pipes from DN15 up to DN6000 mm across steel, stainless steel, cast iron, copper, cement, PVC, aluminum and fiberglass, including lined pipes. Recommended straight run is 10D upstream and 5D downstream, at least 30D from a pump.
Can it also measure heat or energy, not just flow?
Yes. With paired Pt100 temperature transducers connected to the analog inputs, the YF-W200D calculates heat/BTU energy using flow and supply/return temperature difference. This is widely used for chilled water, hot water and thermal energy submetering.
What outputs and integration options are available?
The converter provides one 4–20 mA analog output, one isolated OCT pulse output, one relay, three 4–20 mA inputs (temperature/pressure/level), and an isolated RS485 Modbus RTU port. It runs on DC 8–36 V or optional AC 85–264 V and consumes only 1.5 W.
What information do you need to provide a quotation?
Send pipe outer diameter, wall thickness, pipe material and lining, the fluid and its temperature, operating pressure, whether the area is classified/hazardous, preferred transducer type (clamp-on or insertion), and quantity. We reply in English with the recommended configuration and factory-direct wholesale/OEM pricing.
Need an explosion-proof ultrasonic flow meter?
Tell us your application and we will specify the right YF-W200D configuration with factory-direct pricing.
Or email sales@yeshi-flowmeter.com
Related Products
- YF-W200H Handheld Flow Meter
- YF-P2 Portable Ultrasonic Flow Meter
- YF-C8 Premium Flow Meter
- YF-C6 Fixed Flow Meter
View all models on our Products page, or contact us for selection assistance.
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