JDTCS-I external clamp ultrasonic flowmeter

System Overview:

The JDTCS-I fixed split type ultrasonic flowmeter utilizes the principles of low voltage and multi pulse transmission and reception, and adopts dual balanced signal differential transmission and reception technology and hardware parameter independent design method; Produced through the use of internationally recognized large-scale integrated circuits and SMD mounting and soldering processes. The flexible and versatile Chinese display host meets various industrial sites. Simple and convenient sensors are easy for on-site personnel to install and maintain.

Product Features:

1. Host

The accuracy is better than 1%, and the repeatability is 0.5%, The measurement cycle is500ms，Backlit LCD can simultaneously display data such as instantaneous flow and cumulative flow, instantaneous heat and cumulative heat, flow rate, time, etc

The current output is 4-20mA or 0-20mA, with an impedance of 0-1K and an accuracy of 0.1%, It can achieve heat measurement or dual-use in one machine, Before automatic recording64Recently64Month, before5Annual cumulative traffic, Before automatic recording64The time and data flow of incoming and outgoing calls can be manually or automatically replenished to reduce user data loss

Automatically record whether the working status of the flowmeter in the previous 64 days is normal

The factory configuration of the data interface is RS-232 mode, which can be converted to RS-485 mode after selecting an RS-232/RS-485 converter

2. Special cable

The model is SEYV75-2 shielded type, and a single cable can be extended up to 500 meters. At the same time, be careful not to run parallel with high-voltage cables and try to avoid frequency converters as much as possible

3. Pipeline

Pipe materials: steel, stainless steel, cast iron, cement pipe, copper PVC、 All dense pipelines such as aluminum and fiberglass are allowed to have lining

Tube inner diameter: 15mm~6000mm

Straight pipe section: The sensor installation point should meet the upstream 10D, downstream 5D, and be 30D away from the pump outlet (D refers to the pipe diameter)

4. Measurement medium

Types: Single and uniform liquids that can transmit ultrasonic waves, such as tap water, seawater, industrial wastewater, acidic and alkaline liquids, alcohol, beer, various oils, etc

Temperature: 0 ℃~160 ℃

Turbidity: ≤ 10000ppm, with low bubble content

Flow rate: 0~± 35m/s

Flow direction: bidirectional measurement in both directions, and net flow can be measured

5. Working environment

Host temperature: -30 ℃~80 ℃

Flow sensor temperature: -40 ℃~160 ℃

Temperature sensor temperature: selected according to user needs

Host humidity: 85% RH

Flow sensor humidity: can work in water, water depth ≤ 3m

6. Working power supply

AC220V or DC8-36V or AC7-30V

7. Power consumption

2W (power consumption among domestic models of the same type)

Working Principle:

When ultrasound propagates in a flowing fluid, it carries information about the fluid velocity. Therefore, by receiving ultrasonic waves, the flow velocity of the fluid can be detected and converted into flow rate. Ultrasonic pulses pass through pipelines from one sensor to another, like a ferryman crossing a river. When gas is not flowing, sound pulses propagate in two directions at the same speed (sound velocity, C). If the gas in the pipeline has a certain velocity V (which is not equal to zero), the sound pulses along the flow direction will be transmitted faster, while the sound pulses against the flow direction will be transmitted slower. In this way, the downstream transmission time t ₁ will be shorter, while the upstream transmission time t ₂ will be longer. What is referred to here as longer or shorter is compared to the non flowing transmission time of the gas; According to the detection method, ultrasonic flow meters can be divided into different types such as propagation velocity difference method, Doppler method, beam offset method, noise method, and correlation method.

Sensor technical parameters:

Sensor installation method:

There are four installation methods for sensors. These four methods are respectivelyVLawZLawNLaw andWThe law. Below are separate explanations. Generally, in small diameters(DN15-200mm)You can choose firstVlaw;VWhen the signal cannot be detected by the method or the signal quality is poor, chooseZThe law,NLaw andWLaw is a less commonly used method, suitable forDN50mmThe following fine pipes. The diameter of the pipe isDN200mmWhen measuring cast iron pipes or above, priority should be given to selectingZThe law.

1. V method (commonly used method)

The V-method is generally the standard installation method, easy to use, and accurate in measurement. The measurable pipe diameter range is 15mm to approximately 400mm; when installing the probe, pay attention to aligning the two probes horizontally, with their centerlines level with the pipeline axis.

2TheZlaw(method)

When the pipeline is very thick or due to the presence of suspended solids in the liquid, thick scaling on the inner wall of the pipeline, or thick liningVWhen the installation signal is weak and the machine cannot work properly, it is necessary to chooseZLegal installation. The reason is;useZUltrasonic waves are transmitted directly in pipelines without refraction(Known as single voice path)The signal attenuation is small.

ZThe range of measurable pipe diameters is100mmto6000mm. It is recommended to install a traffic timer in practice200mmAll the above pipelines should be selectedZlaw(The signal measured in this way).