I would like to ask about fully insulated and partially insulated capacitive level gauges
Thread Content
This post was last edited by kylestone on 2017-5-24 at 11:51. 1. Capacitive level gauges are generally fully insulated and are widely used; however, there is also a type that is “partially insulated”. What exactly does this partial insulation refer to? As well as the application scenarios and principles of partial insulation. 2. There is a statement on the manufacturer’s sample that reads, “During installation, please ensure there is a good electrical connection between the process connections and the tank.” Conductive sealing tape can be used. ”What is the purpose of such a requirement?
As the name implies, a capacitive level gauge treats the sensing element and the tank being measured as a single capacitor. The increase or decrease of the measured substance corresponds to changes in the capacitance value, thereby allowing the liquid level to be measured; there is a good electrical connection between the sensing elements and the tank. ”For the tank under test to become part of a capacitor, it must have a good conductive connection to the process. “\"Conductive sealing tape can be used\" probably refers to electrical interfaces, and it has nothing to do with \"a good conductive connection between the connections and the tank.\"
If the medium being measured is conductive, the measuring part of the capacitive level gauge must be insulated in order to create an effective capacitance. If the medium is non-conductive, capacitive level gauges are typically designed as coaxial cylinder types, with two coaxial metal tubes that are insulated from each other; no insulation is required for these tubes themselves. “During installation, please ensure there is a good electrical connection between the process connections and the tank. Conductive sealing tape can be used. ”My understanding is to ensure that the medium inside the tank can be reliably grounded.