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This involves interactions between a business and its customers. It's about meeting customers' needs and resolving their problems. Effective customer service is crucial.
Ultrasonic flowmeter refers to a flowmeter developed based on the principle that the propagation speed of ultrasonic waves in a flowing medium is equal to the vector sum of the average flow velocity of the measured medium and the speed of sound waves in a stationary medium. It is mainly composed of a transducer and a converter. There are different types such as time difference method, Doppler method, beam shift method, and noise method.
1. Working principle
1. Time difference method (mainstream technology)
Calculate the flow velocity by measuring the time difference between the propagation of ultrasonic waves in the fluid in the downstream and upstream:
2. Doppler method
The flow velocity is calculated by using the frequency shift (Doppler frequency shift) of ultrasonic waves reflected by suspended particles in the fluid. It is suitable for fluids containing particles or bubbles (such as sewage, slurry), but not for pure water.
| 2. Main types | ||
| Classification basis | Type | Features |
| Measurement principle | Time difference method | Applicable to clean liquids (such as water, oil), with an accuracy of ±0.5% |
| Doppler method | Applicable to turbid fluids (such as sewage, slurry) | |
| Installation method | Clamp-on type | Non-invasive installation, no pressure loss, applicable to DN20-DN50 pipelines |
| Insertion type | Can be installed without stopping production, applicable to DN50-DN4000 pipelines | |
| Tube type | Requires pipe cutting for installation, high accuracy | |
| Portable | Mobile measurement, built-in battery |
3. Core advantages
- No flow obstruction: non-contact measurement, no pressure loss, and significant energy saving effect.
- Strong adaptability:
- Wide pipe diameter range (DN15 to DN6000mm), especially suitable for large-diameter pipes;
- Can measure highly corrosive and non-conductive liquids;
- Support high-temperature media (up to 160℃).
- Convenient installation: external clamping type does not require shutdown and has low maintenance costs.
4. Application restrictions
1. Fluid requirements
- The time difference method requires pure fluid (few bubbles and impurities);
- The Doppler method requires the medium to contain sufficient scattering particles.
2. Installation conditions
- Straight pipe section requirements: The time difference method requires 5D before and 3D after (D is the pipe diameter), and the Doppler method requires 10D before and 5D after;
- Full pipe state: When the fluid is not full or contains sediment, the accuracy is affected.
3. Temperature limit: Domestic equipment is usually suitable for ≤200℃ fluid.
| 5. Typical application scenarios | ||
| Fields | Scenarios | Adaptation type |
| Municipal water supply | Large-diameter pipeline metering | Time difference method (external clamp type) |
| Sewage treatment | Flow monitoring of liquid containing solid waste | Doppler method |
| Petrochemical industry | Corrosive medium measurement | Insertion type (explosion-proof type) |
| Industrial energy | High-temperature fluid in thermal network | High temperature probe type |
Tip: The selection needs to be based on the fluid characteristics, pipe diameter, accuracy requirements and installation conditions. For example, for trade settlement, the time difference method instrument with 0.5 level accuracy is preferred, and the Doppler method is used for sewage measurement.
| Accuracy | ±1% of reading at rates>0.2 mps |
| Repeatability | 0.20% |
| Principle | Transmit time |
| Velocity | +32m/s |
| Pipe Size | DN15mm-DN6000mm |
| Display | LCD with backlight, display accumulated flow/heat, instantaneous flow/heat, velocity, time etc. |
| Signal Output | 1 way 4-20mA output; 1 way OCT pulse output; 1 way relay output |
| Signal input | 3 way 4-20mA input achieve to heat measurement by connecting PT100 platinum resistor |
| Other Functions | Automatically record the forward, reverse, net accumulated flow rate and heat. Automatically record the time of power-on/off and flow rate of the last 30 times. Replenish by hand or read the data through Modbus communication protocol. |
| Pipe Material | Carbon Steel, stainless steel, cast iron, cement pipe, copper, PVC, aluminum, FRP etc. Liner is allowed |
| Straight Pipe Section | Upstream: 10D; Downsteam: 5D: From the pump: 30D (D means outer diameter) |
| Liquid Types | Water, sea water, industrial sewage, acid & alkali liquid, alcohol, beer, all kinds of oils which can transmit ultrasonic single uniform liquid |
| Liquid Temperature | Standard: -30℃~90℃, High-temperature: -30℃~160℃ |
| Liquid Turbidity | Less than 10000ppm, with a little bubble |
| Flow Direction | Bi-directional measuring, net flow/heat measuring |
| Environment Temperature | Main Unit: -30℃~80℃; Transducer: -40℃~110℃; Temperature transducer: select on enquiry |
| Environment Humidity | Main Unit: 85% RH; Transducer: standard is lP65, lP68(optional) |
| Cable | Twisted Pair Line, standard length of 5m, can be extended to 500m (not recommended)Contact the manufacturer for longer cable requirement. RS-485 interface, transmission distance up to 1000m |
| Power Supply | AC220v and DC24V |
| Power Consumption | Less than 1.5W |
| Communication | MODBUS RTU RS485 |
