The static pressure level sensor, also known as the static pressure liquid level gauge or level transmitter, functions as a pressure sensor that measures liquid levels. This type of transmitter operates on the principle that the hydrostatic pressure of a liquid is directly proportional to its height. By utilizing advanced foreign technologies, such as isolated diffused silicon sensitive elements or ceramic capacitive pressure sensors, these transmitters convert static pressure into an electrical signal. This signal is further processed through temperature compensation and linear correction to produce a standardized electrical output, typically ranging from 4 to 20 mA or 1 to 5 VDC.
These level transmitters are available in two main types: contact and non-contact. Contact types include single flange static pressure transmitters, double flange differential pressure transmitters, float-type liquid level transmitters, magnetic level transmitters, input-type liquid level feeders, electric float level transmitters, capacitive level transmitters, magnetostrictive level transmitters, and servo level transmitters. Non-contact types consist of ultrasonic and radar liquid level transmitters.
Static pressure input type level transmitters are ideal for various media measurements across industries such as petrochemicals, metallurgy, power generation, pharmaceuticals, water supply and drainage, and environmental protection. Their compact design, ease of adjustment, and flexible installation options make them highly user-friendly. Users can choose from standard signal output methods like 4 to 20 mA, 0 to 5 V, or 0 to 10 mA depending on their needs.
The principle behind hydrostatic liquid level measurement is a key application of pressure sensors. Special cables with ventilation ducts and advanced sealing techniques ensure both waterproofing and communication between the reference pressure chamber and ambient pressure, enhancing measurement accuracy and stability.
When comparing different liquid level sensors, it's important to note their unique features. For instance, float-type liquid level sensors operate based on the Archimedes' principle of buoyancy, converting liquid level changes into resistance signals. These sensors are robust, resistant to moisture, shocks, and corrosion, and feature built-in protective circuits to safeguard against power surges.
In contrast, static pressure level sensors use silicon pressure load cells to measure pressure, which is then amplified and compensated before being output as either 4 to 20 mA or 0 to 20 mA current signals. They are renowned for their stability, long-term full-scale and zero-point stability, minimal temperature drift, and excellent reliability due to their solid construction without moving parts.
For example, the CBM-2100/CBM-2700 input static pressure gauge boasts a reliable anti-corrosion probe with a ceramic measuring unit, suitable for clean water, sewage, and saltwater level measurement. The GY500, featuring a diffused silicon piezoresistive core and 316 stainless steel structure, offers additional benefits like explosion-proofing and enhanced durability.
Looking ahead, the domestic magnetic flap liquid level sensor market has been growing at a rate exceeding 10% annually. By 2010, sales had reached 90.5 billion yuan. Projections indicate steady growth over the next five years, driven by the Internet of Things (IoT) market. By 2015, the IoT-driven market size for liquid level sensors in China is expected to reach 1.2 billion yuan. With the IoT's overall market size in China reaching 750 billion yuan by 2013, the liquid level sensor industry stands to benefit significantly.
Despite these promising trends, domestic manufacturers face challenges such as limited core technology, inconsistent standards, and insufficient product variety. Nevertheless, the future remains bright, with continuous advancements expected in the sector.
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