Products
Precautions for installation of portable ultrasonic flowmeter
When a portable ultrasonic flowmeter is in operation, high-frequency pulse sound waves are emitted by a transducer (probe) and reflected off the surface of the measured object (water surface). The reflected echoes are received by the same transducer (probe) and converted into electrical signals. The time between pulse transmission and reception (the motion time of sound waves) is proportional to the distance from the transducer to the surface of the object. The relationship between the distance S of sound wave transmission, the speed of sound C, and the transmission time T can be expressed by the formula: S=C X T/2
The installation of ultrasonic level gauges must consider the blind spot issue of ultrasonic level gauges. When the liquid level enters the blind zone, the ultrasonic transmitter cannot measure the liquid level. Therefore, when determining the range of the ultrasonic level gauge, a margin of 50 centimeters must be left. When installing, the transmitter probe must be about 50 centimeters above the liquid level. This is the only way to ensure accurate monitoring of the liquid level and ensure the safety of the ultrasonic level gauge.
II. Product characteristics
1. Good stability and high accuracy
Linearity better than 0.5%, repeatability accuracy better than 0.2%, measurement accuracy better than ± 1%
2. Wide measurement range, three probe options available
By selecting different types of sensors, it is possible to measure the flow rate of pipelines with diameters ranging from DN15 to DN6000mm, with a flow velocity range of -32m/s to+32m/s
3. Built in printer
It can achieve real-time screen printing and also print measurement results of up to 20 pre-set items on a scheduled basis.
4. Built in nickel hydrogen battery, rechargeable for operation
Equipped with a large capacity nickel hydrogen rechargeable battery, it can support continuous operation of the flowmeter for more than 20 hours
5. Built in data logger
Up to 20 pre-set measurement results can be uploaded to a computer or networked communication
6. Support Chinese and English menus
Different versions of flow meters can support Chinese or English menus
7. High reliability
By adopting low-voltage and multi pulse transmission circuits, the measurement accuracy, service life, and reliability are greatly improved
8. Strong anti-interference ability
Adopting a dual balanced signal differential transmission and reception circuit, effectively resisting strong interference sources such as frequency converters, TV towers, and high-voltage lines
三、产品参数III. Product parameters
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Category Parameters |
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Host |
Principle |
Ultrasonic Time Difference Principle, 4-Byte IEEE754 Floating Point Arithmetic |
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Precision |
Flow rate: better than ±1% |
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display |
Can be connected to 2 × 10 backlit Chinese characters or 2 × 20 characters Western type LCD display, support for Chinese, English and Italian languages |
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signal output |
1 channel 4~20mA current output, impedance 0-1K, precision 0.1% |
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1 OCT pulse output (pulse width 6-1000ms, default 200ms) |
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1 relay output |
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signal input |
3-way 4~20mA current input, accuracy 0.1%, can collect temperature, pressure, liquid level and other signals |
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Three-wire PT100 platinum resistors can be connected for heat measurement. |
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data interface |
Isolated RS485 serial interface, can be upgraded through the PC computer on the flowmeter, support MODBUS and other protocols |
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Pipeline conditions |
Tubing |
Steel, stainless steel, cast iron, cement pipe, copper, PVC, aluminum, glass fiber reinforced plastic and all other dense piping, lining permitted |
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Tube inner diameter |
15-6000mm |
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Straight pipe section |
Sensor installation point *** meets: 10D upstream, 5D downstream, 30D from the pump outlet (D is the diameter of the pipe) |
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Measuring medium |
species |
Water, seawater, industrial wastewater, acid and alkali liquids, alcohol, beer, various oils and other single uniform liquids that can conduct ultrasonic waves. |
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Temperature |
Standard probe: -30 to 90℃, high temperature probe: -30 to 160℃ |
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turbidity |
10000 ppm with low bubble content |
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flow rate |
0～±10 m/s |
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working environment |
Temperature |
Main body: -20～60℃, flow sensor: -30℃～160℃ |
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humidity |
Host: 85%RH; flow sensor: can be immersed in water, the depth of water ≤ 2m (Note: after the sensor is filled with rubber) |
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electric power source |
8 built-in 1.2V capacity of 2000mAH rechargeable Ni-MH batteries, each time fully charged can continue to work for 20 hours, optional 4-20mA output signal, can work continuously for 8 hours.AC90~260V power adapter, can realize uninterrupted measurement. |
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power wastage |
1.5W |
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