In the field of industrial automation and process control, liquid level measurement is a key link to ensure production safety and efficiency.IP68Ultrasonic level gauges have become the choice for liquid level monitoring in industries such as chemical, water treatment, and food processing due to their non-contact measurement, high protection level, and ability to adapt to complex environments. This article is based onAC100Taking the series as an example, systematically analyze its working principle and technical characteristics.

1、 Working principle: Accurate implementation of acoustic ranging

IP68The core principle of ultrasonic level gauge is based on time difference distance measurement, which calculates the liquid level height by transmitting and receiving ultrasonic signals. The specific process is as follows:

Ultrasonic emission

The built-in piezoelectric transducer of the device converts electrical pulses into high-frequency ultrasonic waves (usually20-200kHz）It is emitted vertically in the form of pulses towards the liquid surface.AC100The series adopts narrow pulse emission technology, with concentrated energy and strong anti-interference ability, which can effectively penetrate steam, foam and other media.

Liquid level reflection and signal reception

Ultrasonic waves reflect upon contact with the liquid surface, with some of the energy returning to the transducer. The device captures the echo signal through a high-sensitivity receiving circuit and records the time difference from transmission to reception（Δt）.

Liquid level calculation

According to the formula liquid level height=speed of sound× Δt / 2Calculate distance.AC100The series is equipped with a built-in temperature compensation module, which can automatically correct the variation of sound speed with environmental temperature (such as...)20℃The speed of sound is approximately343m/s，100℃Time Schedule386m/s）Ensure measurement accuracy±0.25%FS.

Output and Display

The device converts liquid level data into4-20mACurrent signalRS485Digital signal or relay switch quantity, supporting andPLCTheDCSWait for seamless integration of the system. Meanwhile, throughLEDReal time display of liquid level values and historical curves on the display screen or upper computer software.

2、 Technical features: versatile design that adapts to harsh environments

1. IP68Protection level: fully sealed, dustproof and waterproof

AC100The series shell adopts304Made of stainless steel material, the circuit board and sensor are fully sealed through encapsulation technology, and can be submerged underwater for a long time1.5Rice（IP68Standard), resistant to dust, moisture, and short-term immersion. For example, in the aeration tank of a sewage treatment plant, the equipment can operate stably in environments containing corrosive gases and high humidity5Years or more.

2. Non contact measurement: no mechanical wear

Ultrasonic technology does not require contact with liquids, avoiding measurement errors caused by medium adhesion and corrosion in traditional float and static pressure level gauges. In syrup storage tanks in the food industry,AC100It can accurately measure the liquid level through the vapor layer without the need for regular cleaning of the sensor surface.

3. Wide range and high adaptability

support0.25-25The measurement range of meters can cover the needs of small experimental tanks to large water storage towers. At the same time, the device has built-in automatic gain control（AGC）The function can dynamically adjust the receiving sensitivity according to the reflection intensity of the liquid surface, and adapt to different media such as clean liquid, foam, suspended solids, etc.

4. Intelligent function: Simplify operation and maintenance

Self diagnostic alarm: When the echo signal strength is below the threshold or the temperature is abnormal, the device automatically triggers a fault alarm.

Empty tank calibration: Users can input the height of the empty tank through buttons and complete zero point calibration with one click, reducing on-site debugging time.

Data Storage: Built inEEPROMCan be stored100Group measurement data, supporting automatic parameter recovery after power failure.

3、 Application scenario: Cross industry liquid level management solution

In the field of chemical engineering, monitor the liquid level of acid and alkali storage tanks and reaction vessels to prevent overflow or emptying.

Water treatment: Implement remote liquid level monitoring in sewage treatment tanks and fire water tanks, and link pump station start and stop.

Agricultural irrigation: powered by solar energyAC100Liquid level gauge, automatically controls the water flow from the reservoir to the farmland.

Conclusion

IP68Ultrasonic level gauge“Sonic distance measurement+Fully sealed design”As the core, it solves the pain points of traditional level gauges in harsh environments through non-contact measurement, intelligent compensation, and high reliability. With the advancement of industry4.0With the increasing demand for process control accuracy, such equipment will continue to provide key guarantees for safety production in industries such as energy, environmental protection, and food through technological innovation.