Catalog excerpts
Vibrating Tuning Fork Liquid Level Switch Successfully Used in Level Control of Fermenter Bio-fermentation technology is common in the production of beer, soy sauce and monosodium glutamate. In the whole fermentation process, it is necessary to detect temperature, PH value, dissolved oxygen concentration and liquid level. The detection of liquid level to achieve timely feeding is crucial for maintaining the nutrition needed in biological growth. The feeding system is mainly composed of feed diaphragm valve, metering tank, high / low liquid level switch, discharge diaphragm valve, etc. During fermentation process, microbes usually grow more vigorously. After feeding and stirring, a lot of bubbles are generated, which causes interference to the accurate liquid level measurement. This puts forward high requirements for liquid level switch, that is, the measurement of liquid level should not be affected by bubbles and the change of dielectric constant, so as to ensure accurate liquid level measurement. Selectable level sensors: At present, common liquid level sensors are: float level indicator, capacitive liquid level switch, RF admittance liquid level switch, external cage switch, photoelectric liquid level sensor and vibrating tuning fork liquid level switch. Base on different working principles and product performance, each of them are designed to apply in different working conditions. Float level indicator is based on the principle of buoyancy and static magnetic field. Due to magnetic effect, as the float moves, the proximal reed switches are magnified by the permanent magnet in the float and change the status from “open” to “closed”. The resistance value in the sensor changes linearly. For capacitive liquid level switch, the liquid of tank act as the dielectric medium, which will affect the capacitance created between the two electrodes. If the liquid level rises and falls, this will change the capacitance measured by the probe in a predictable way, and therefore it can be used very effectively as a measurement of liquid level. The working principle of RF admittance level switch is similar to that of capacitive liquid level switch. But as an upgraded technology from capacitive liquid level switch, RF admittance level switch has higher reliability due to the anti-hanging circuit. External cage switch is a kind of non-contact liquid level measuring instrument which uses "frequency conversion ultrasonic technology" to measure the liquid level outside a tank. The measuring probe installed on the outer wall of a vessel emits ultrasonic wave and detects its residual vibration signal. When level overflows the probe, the amplitude of residual vibration Shenzhen Jiwei Automations Lt
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signal becomes smaller; when instrument detects the change of residual vibration signal, it outputs a switch signal to achieve the purpose of liquid level alarm. Photoelectric liquid level sensor is operates using optical principles——the principle of refraction and reflection of light, and infrared ray to measure the liquid level. The light is reflected or refracted at the interface of two media. When measured liquid is at a high level, the measured liquid forms an interface with sensor; when at a low level, another interface forms between the air and the sensor. The liquid sensor is...
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Type Float level indicator Capacitive liquid level switch RF admittance liquid level switch External cage switch Photoelectric liquid level sensor Vibrating tuning fork liquid level switch Adaptability comparison of various liquid level sensors Dielectric Foam/bubble Easy constant Stability Price interference installation interference Mechanical，bad No No Yes Low stability Parameters need to be adjusted Moderate Yes according to the Yes Moderate dielectric constant, bad stability Parameters need to be adjusted Moderate Yes according to the Yes Moderate dielectric constant, bad stability No...
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vibration and other liquid characteristics. So, vibrating tuning fork liquid level switch is a good choice for the liquid level measurement of fermenter. After comparison, a Guangdong biotechnology company decided to select Jiwei vibrating tuning fork liquid level switch. Jiwei Ring-11 Liquid Level Switch has following advantages that comparable to imported products: ● With only 40mm fork length, specially designed for pipelines and other applications with constricted space. ● High sensitivity due to the precisely pre-adjusted harmonic resonant frequency of the fork, the lowest measurable...
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