Analysis of Common Faults of Ultrasonic Level Gauge

Understand the measured media:

a) liquids; objects; dust; whether rules; liquid and flat objects with the actual range can be, other increase 1-2 specifications matching, in addition to my company's existing two programs, a measurement level, another One is a program that specifically targets the material (material). Please specify when ordering.

b) Whether antisepsis is required; some chemicals need anti-corrosion probes (the material is polytetrafluoroethylene (Ptfe))

c) Whether there is volatilized gas (usually chemical) or not; in some occasions the gas is volatilized to the probe, which will affect the sound speed of the ultrasonic wave, which may cause errors in the measurement. This requires understanding what gas;

d) Whether there is fog: The treatment method is to add 4F film to the probe bottom lining to prevent the probe from water vapor. The blind area with 4F film will be larger, generally 40CM.

2. Learn about jars:

a) The level change range; the highest level and zero position, which is the corresponding 4-20MA, can be freely set here

b) height of the jar itself;

c) The distance between the caliber and the mounting position of the watch to the tank wall; this has a problem with the beam angle, which is typically 8-10 degrees

d) whether it is closed;

e) With no pressure; can withstand 0. 3MPA

f) Temperature: Need to see the actual impact on the temperature of the table, -25-80 degrees

3. Understand the site installation requirements:

a) Dead zone: 20-60CM depending on the range, the installation needs to set a blind zone, it is recommended to set 40CM

b) integrated or split

c) Several wire system

d) The cable length (split) is standard 10M and the excess part is 5 yuan per meter

e) Installation method: flange size, etc.

f) Supply voltage selection

The advantages of ultrasonic level gauges

Non-contact measurement

No moving parts, simple structure, long service life

Corrosion resistance (most probes use PVDF, PP and other materials)

Automatic temperature compensation

Not affected by the humidity and viscosity of the medium

Not affected by dielectric permittivity, conductivity, and thermal conductivity

Excellent performance to price ratio

The most common problem with ultrasonic level gauges is the top blue fault light. In conjunction with the actual list the following solutions:

1. When the ultrasonic wave continues to zero level, the top light is on and the output current is 22MA. And when the fluid level is restored after a period of time, the fault cannot be automatically cancelled, and it is necessary to turn off the power after the power is turned off, causing unnecessary troubles or even losses to the customer (for example, unattended at night).

This type of failure is a matter of choice for mounting accessories. In addition to the flat head, the ultrasonic wave is emitted from the thread. If there is a continuous zero position, use metal brackets for mounting parts. The ultrasonic level gauge will recognize that the signal strength of the bracket part is greater than the signal strength received by the flat head. The distance between the metal support part and the transmitted wave is in the blind zone. So the ultrasonic wave is in the protection state, the fault light is always on and the output is 22MA.

The solution is to use non-metallic stents. Because the non-metallic stent is used, the transmitted wave at the thread can penetrate, and the echo signal of the zero liquid level will definitely be larger than the echo signal at the thread. After the above explanation and actual improvement, all the faults have been solved, and both the supplier and the buyer are happy. This further strengthened cooperation.

2. After debugging and reprogramming, the top fault light is on and the output current is 22MA. The occurrence of this kind of failure situation, after actual verification, or in the process of programming and debugging, failed to follow the instructions. The resulting program is disorderly and self-protected. The customer is not able to wait for the indicator lamp to flash normally when debugging the programming ultrasonic level meter, or the programming method steps are not correct at all, and it is in unstable programming and debugging. If it is repeatedly programmed and debugged as required, the ultrasonic level gauge will refuse to work and protect itself. The solution to this failure is to reset the ultrasonic level gauge as required and reprogram it. If you reprogram multiple times without resetting, the above fault will occur.

The principle of an ultrasonic level gauge is to measure the time it takes for an ultrasonic pulse to go from launching to returning. The ultrasonic level gauge is vertically mounted on the surface of the liquid and emits an ultrasonic pulse to the liquid surface. After a period of time, the ultrasonic level gauge sensor receives the signal reflected from the liquid surface, and the signal is selected and processed by the transmitter circuit. The distance from the liquid level to the sensor is calculated based on the time difference between the ultrasonic level gauge sending and receiving ultrasonic waves.

Ultrasonic liquid level gauge technical advantages: ultrasonic level gauge is a non-contact measurement method, ± 0.2% accuracy, 1-25 meters range, excellent focus: 5 degree beam angle, a variety of sensor materials, built-in full-scale temperature compensation. Ultrasonic level gauges measure corrosion (acid, alkali) media, contaminated sites (sewers), or substances that are prone to adherents. Suitable for liquids that cannot be physically contacted.

Components of ultrasonic level gauge: ultrasonic transducer, processing unit, output unit

Ultrasonic level gauge is a very ideal measurement tool for corrosive, knotted or acid-alkali wastewater. The measurable medium of the ultrasonic level gauge includes industrial agents such as hydrochloric acid, sulfuric acid, hydroxide, waste water, resin, paraffin, mud, lye, and bleach, and are widely used in water treatment, chemical industry, electric power, metallurgy, petroleum, and semiconductors. Other industries.

Ultrasonic level gauge precautions

Temperature capability is limited, most are less than 60°C, and individual special products can reach 100°C

Unable to measure in a vacuum environment, large fluctuations in pressure affect the measurement accuracy

Avoid bubbles, obstacles, waves and other interference factors during installation

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