The level sensor, commonly referred to as a static pressure level gauge, level transmitter, or water level sensor, is essentially a pressure sensor that gauges liquid levels. The static pressure input type liquid level transmitter operates on the principle that the measured hydrostatic pressure is proportional to the height of the liquid. Utilizing advanced foreign technologies, such as isolated diffusion silicon sensitive elements or ceramic capacitor pressure-sensitive sensors, this device converts static pressure into a voltage signal, which is further transformed into a standardized electrical signal—typically between 4 to 20 mA or 1 to 5 VDC—after temperature compensation and linear calibration.
This type of level transmitter is ideal for various media in industries like petrochemicals, metallurgy, power generation, pharmaceuticals, water supply, environmental protection, and more. Its compact design, ease of adjustment, and flexible installation options make it highly user-friendly. Users can choose from standard signal outputs such as 4 to 20 mA, 0 to 5 V, or 0 to 10 mA, depending on their needs.
Measuring liquid levels via hydrostatic principles is a key application of pressure sensors. With features like a specially designed vented cable and advanced sealing techniques, these sensors ensure both waterproof integrity and communication with ambient pressure, thereby guaranteeing high precision and stability.
There are two main types of liquid level sensors: contact type and non-contact type. Contact types include single-flange static pressure, double-flange differential pressure level transmitters, float-type liquid level transmitters, magnetic liquid level transmitters, input-type liquid level feeders, and more. Non-contact types include ultrasonic and radar liquid level transmitters.
Static pressure input type liquid level transmitters are particularly effective for measuring liquid levels across a wide variety of media. They boast excellent long-term stability, with full-scale and zero-point stability reaching up to 0.1%FS per year. In the temperature range of 0 to 70°C, the temperature drift is less than 0.1%FS, and across the entire operational temperature range, it remains below 0.3%FS. These devices also feature reverse polarity protection, current limiting protection, solid-state construction, and easy installation.
For instance, the CBM-2100/CBM-2700 input static pressure gauge offers reliable anti-corrosion properties with a ceramic measuring unit, suitable for clean water, sewage, and saltwater level measurements. The GY500, another model, combines a diffused silicon piezoresistive core, 316 stainless steel structure, and explosion-proof design, making it ideal for river, groundwater, reservoir, water tower, and container level measurements.
In comparison, float-type liquid level sensors operate based on the Archimedes' principle of buoyancy, using a magnetic float to detect liquid levels. These sensors often incorporate small metal film strain sensing technology and can be equipped with field buttons for routine operations. Similarly, the float-type liquid level transmitter comprises a magnetic float ball, a measuring pipe, a signal unit, an electronic unit, and more, converting the liquid level signal into a resistance signal proportional to the liquid level change.
Static pressure level sensors work by converting the measured pressure into an electrical signal using a silicon pressure load cell sensor. This signal is then amplified, compensated, and ultimately outputs a current signal of either 4 to 20 mA or 0 to 10 mA. The sensor’s pressure measurement principle involves calculating the pressure on the liquid surface based on the formula P = Ï.g.H + Po, where P is the pressure on the liquid surface, Ï is the liquid's density, g is the local gravitational acceleration, H is the depth of the transmitter into the liquid, and Po is the atmospheric pressure on the liquid surface.
In summary, the static pressure level sensor offers numerous advantages, including high stability, long-term reliability, and easy installation. With its broad range of applications and robust technical parameters, it stands out as a reliable choice for liquid level measurement in various industries.
As we look ahead, the domestic magnetic flap liquid level sensor market is projected to grow at a rate exceeding 10% annually. By 2015, the Chinese liquid level sensor market is expected to reach a size of 1.2 billion yuan, driven significantly by the burgeoning IoT sector. By 2013, the total IoT market size in China is anticipated to reach 750 billion yuan, with liquid level sensors benefiting directly from this expansion. However, despite promising growth, domestic manufacturers face challenges in terms of core technology, design standards, and product diversity, necessitating continuous innovation and improvement to stay competitive globally.
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