Level sensors in the cable selection there will always be some common problems, such as: level sensors, how long the cable must lead gas? Does air conduction or not have an impact on the accuracy? Level sensors need to offset the atmospheric pressure of the measured liquid surface in real time to ensure its measurement accuracy, such as the probe range is greater than 160 meters, then its measurement accuracy is greater than the amount of atmospheric pressure changes can be selected without gas-conducting cable. The following is the principle to let you have a deeper understanding. Liquid level sensor to meet the liquid surface by the pressure formula: Ρ = ρgh + Po where: P: liquid level meter to meet the liquid surface pressure (for ease of understanding, hereinafter collectively referred to as pressure) ρ : measured liquid density g: acceleration of gravity (commissioning according to 9.8015) Po : Atmospheric pressure on the liquid surface h: the depth of the sensor into the liquid Level sensor into the measured liquid at a certain depth, the pressure of the measured medium into the positive pressure chamber of the liquid level sensor, through the cable conduit will be the liquid surface of the atmospheric pressure Po and the sensor is connected to the negative pressure chamber to offset the sensor front of the Po, so that the sensor measured pressure: ρgh, obviously, through the measurement of the pressure P, you can get the depth of the liquid level. Star Instruments Sensor Technology Co., Ltd. is a collection of research and development, production, sales as one of the high-tech enterprises. Specializing in the production of pressure transmitters, level transmitters, temperature transmitters, temperature and humidity transmitters, differential pressure transmitters, soil moisture transmitters, 3051 transmitters and related instrumentation accessories. Many products under the brand of Star Instruments have obtained a number of patents issued by the state, such as CE certification, IS9001 certification, SGS certification, TüV SüD certification, explosion-proof certification and so on. For product consultation, product customization, agency, technical inquiries, quotations, etc., please contact Star Instruments: 400-600-4496 !