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Introduction to the main indicators of ultrasonic level meter

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1. Range

It represents the maximum range that the ultrasonic level meter can measure and reflects the sensitivity of the transducer. The larger the range, the higher the sensitivity. The ultrasonic level meter can be equipped with transducers of different ranges such as 4, 6, 8, 10, 20, 30m. When the ultrasonic attenuation is fast and the interface reflection is poor, in order to prevent the ultrasonic signal received by the ultrasonic probe from being too weak to be distinguished from the noise signal, it is necessary to increase the transmitting power of the transducer.

2. Blind area

It is also called the dead zone, which is a distance that cannot be measured by the ultrasonic level meter. When the ultrasonic level meter transmits ultrasonic pulses, it cannot detect the reflected echo at the same time. Since the transmitted ultrasonic pulse has a certain time width, and the sensor still has after-vibration after the ultrasonic is transmitted, the reflected echo cannot be detected during the period. Therefore, a small distance from the probe surface downward cannot be detected normally. This distance is called a blind zone. For products with the same measuring range, the smaller the blind zone, the better the design of the transducer.

3. Temperature

The normal range is -10~60 degrees Celsius. Although the limit working temperature of piezoelectric ceramics is generally 150 degrees Celsius, most of the materials in the manufacturing process of ultrasonic level gauges cannot work for a long time at temperatures above 100 degrees Celsius.

4. Accuracy

Mainly affected by temperature changes, in order to ensure measurement accuracy, most ultrasonic level meters have a temperature compensation function. In addition, changes in the gas composition will also affect the accuracy of the ultrasonic level gauge. For example, some volatile liquids will cause changes in the air composition after volatilization, leading to changes in the sound velocity of the gas and causing measurement errors. Most manufacturers can control the accuracy within 0.5% under normal temperature and pressure and without interference from the external environment.

5. Two-wire system and three-wire system

The power supply (DC24v) and signal output (DC4-20mA) of the two-wire ultrasonic level meter share the same circuit, that is, only two wires are used. The disadvantage is that the transmit power is relatively weak. The three-wire ultrasonic level meter is actually a four-wire system, and its power supply (DC24v) and signal output (DC4-20mA) circuits are separated, and two wires are used for each. When their negative ends are connected to the common ground, three wires are usually used. , Its advantage is that the transmission power is larger.

1. Range

It represents the maximum range that the ultrasonic level meter can measure and reflects the sensitivity of the transducer. The larger the range, the higher the sensitivity. The ultrasonic level meter can be equipped with transducers of different ranges such as 4, 6, 8, 10, 20, 30m. When the ultrasonic attenuation is fast and the interface reflection is poor, in order to prevent the ultrasonic signal received by the ultrasonic probe from being too weak to be distinguished from the noise signal, it is necessary to increase the transmitting power of the transducer.

2. Blind area

It is also called the dead zone, which is a distance that cannot be measured by the ultrasonic level meter. When the ultrasonic level meter transmits ultrasonic pulses, it cannot detect the reflected echo at the same time. Since the transmitted ultrasonic pulse has a certain time width, and the sensor still has after-vibration after the ultrasonic is transmitted, the reflected echo cannot be detected during the period. Therefore, a small distance from the probe surface downward cannot be detected normally. This distance is called a blind zone. For products with the same measuring range, the smaller the blind zone, the better the design of the transducer.

3. Temperature

The normal range is -10~60 degrees Celsius. Although the limit working temperature of piezoelectric ceramics is generally 150 degrees Celsius, most of the materials in the manufacturing process of ultrasonic level gauges cannot work for a long time at temperatures above 100 degrees Celsius.

4. Accuracy

Mainly affected by temperature changes, in order to ensure measurement accuracy, most ultrasonic level meters have a temperature compensation function. In addition, changes in the gas composition will also affect the accuracy of the ultrasonic level gauge. For example, some volatile liquids will cause changes in the air composition after volatilization, leading to changes in the sound velocity of the gas and causing measurement errors. Most manufacturers can control the accuracy within 0.5% under normal temperature and pressure and without interference from the external environment.

5. Two-wire system and three-wire system

The power supply (DC24v) and signal output (DC4-20mA) of the two-wire ultrasonic level meter share the same circuit, that is, only two wires are used. The disadvantage is that the transmit power is relatively weak. The three-wire ultrasonic level meter is actually a four-wire system, and its power supply (DC24v) and signal output (DC4-20mA) circuits are separated, and two wires are used for each. When their negative ends are connected to the common ground, three wires are usually used. , Its advantage is that the transmission power is larger.

1. Range

It represents the maximum range that the ultrasonic level meter can measure and reflects the sensitivity of the transducer. The larger the range, the higher the sensitivity. The ultrasonic level meter can be equipped with transducers of different ranges such as 4, 6, 8, 10, 20, 30m. When the ultrasonic attenuation is fast and the interface reflection is poor, in order to prevent the ultrasonic signal received by the ultrasonic probe from being too weak to be distinguished from the noise signal, it is necessary to increase the transmitting power of the transducer.

2. Blind area

It is also called the dead zone, which is a distance that cannot be measured by the ultrasonic level meter. When the ultrasonic level meter transmits ultrasonic pulses, it cannot detect the reflected echo at the same time. Since the transmitted ultrasonic pulse has a certain time width, and the sensor still has after-vibration after the ultrasonic is transmitted, the reflected echo cannot be detected during the period. Therefore, a small distance from the probe surface downward cannot be detected normally. This distance is called a blind zone. For products with the same measuring range, the smaller the blind zone, the better the design of the transducer.

3. Temperature

The normal range is -10~60 degrees Celsius. Although the limit working temperature of piezoelectric ceramics is generally 150 degrees Celsius, most of the materials in the manufacturing process of ultrasonic level gauges cannot work for a long time at temperatures above 100 degrees Celsius.

4. Accuracy

Mainly affected by temperature changes, in order to ensure measurement accuracy, most ultrasonic level meters have a temperature compensation function. In addition, changes in the gas composition will also affect the accuracy of the ultrasonic level gauge. For example, some volatile liquids will cause changes in the air composition after volatilization, leading to changes in the sound velocity of the gas and causing measurement errors. Most manufacturers can control the accuracy within 0.5% under normal temperature and pressure and without interference from the external environment.

5. Two-wire system and three-wire system

The power supply (DC24v) and signal output (DC4-20mA) of the two-wire ultrasonic level meter share the same circuit, that is, only two wires are used. The disadvantage is that the transmit power is relatively weak. The three-wire ultrasonic level meter is actually a four-wire system, and its power supply (DC24v) and signal output (DC4-20mA) circuits are separated, and two wires are used for each. When their negative ends are connected to the common ground, three wires are usually used. , Its advantage is that the transmission power is larger.