Introductions
WESDUN is a manufacturer specializing in the production of Handheld ultrasonic;Clamp-on flow meter;DN20 flow meter.WESDUN handheld ultrasonic flow meter realizes non-contact measurement of liquid flow. Install the sensor on the outer wall of the pipeline to complete the flow measurement. It has the characteristics of small size. Convenient carrying and accurate measurement.
Working Principle : Time-transit measurement principle is adopted, the signal transmitted by one flow meter transducer passes through the pipe wall, the medium, and the other side pipe wall, and is received by another flow meter transducer.
At the same time, the second transducer also transmits the signal received by the first transducer. The influence of the medium flow rate, there is a time difference, and then the flow value Q can be obtained.
Main technical Parameters
| NO.1 | Transducer Selection | |||
| (Generally according to the need to measure the pipeline to choose) | ||||
| Type | Picture | Specification | Measuring range | Temperature range |
| Clamp on type |  | Small-size | DN20mm~DN100mm | -30°~90℃ |
 | Middle-size | DN50mm~DN700mm | -30°~90℃ | |
 | Large-size | DN300mm~DN6000mm | -30°~90℃ | |
| High temperature clamp on type |  | Small-size | DN20mm~DN100mm | -30°~160℃ |
| Middle-size | DN50mm~DN1000mm | -30°~160℃ | |
| Large-size | DN300mm~DN6000mm | -30°~160℃ | |
| Mounting bracket clamp on |  | Small-size | DN20mm~DN100mm | -30°~90°℃ |
 | Middle-size | DN50mm~DN300mm | -30°~90℃ | |
 | King-size | DN300mm~DN700mm | -30°~90℃ | |
| NO.2 Select Installation Methods | |
| External clip mounting | Bracket mounting |
 |  |
| Debug complex | Simple debugging |
| Not suitable for frequent testing | Not Suitable for frequent testing |
Installation
- It must be ensured that the straight pipe section where the probe is installed is: 10D on the upstream side(D is the pipe diameter), 5D or more on the downstream side, and there must be no factors that disturb the fluid(such as pumps,valves, throttles, etc.) in the 30D on the upstream side. And try to avoid the unevenness and welding position of the pipeline under test.
- The pipeline is always full of liquid, and the fluid should not contain bubbles or other foreign objects. For horizontal pipelines, install the detector within ±45°of the horizontal center line. Try to choose the horizontal center line position.
- When install the ultrasonic flow meter, need to input these parameters: pipe material,pipe wall thickness and pipe diameter. Fulid type, whether it contains impurities,bubbles, and whether the tube is full.
Transducers installation
1.V-method Installation
V-method installation is the most widely used mode for daily measurement with pipe inner diameters ranging from 15 millimeter to 200 millimeter.It is also called reflective mode or method.
2.Z-method Installation
Z-method is commonly used when the pipe diameter is between 300millimeters and 500 millimeters.
3.W-method Installation
W-method is usually used on plastic pipes with a diameter from 15millimeters to 100 millimeters
