Series 6012/6013 B|W Controls Electrode Holders/Electrodes
■Since its introduction is 1933,the original BIW concept of utilizing the electrical conductivity of most liquids as a means of achieving liquid level control has won wide- spread acceptance as the most versatile and reliable sys- tem of its kind.In the BlW system of floatless liquid level control,electrodes or probes are suspended in the container to make contact with the liquid and thus complete a circuit which actuates a BIW relay.The relay contacts in turn are used for a wide range of applications such as con- trolling pumps and valves,or sounding alarms on level conditions.
■Electrodes and holders should be selected according to the specific characteristics of the liquid involved,the lengths required to obtain the desired control of levels,and the physical nature of the container.Because of these factors,the BlW line of electrodes and holders presented in this section has been developed to provide a practical,economical solution to almost every conceivable application and installation problem.When necessary,special equipment can also be supplied to meet specific needs.
■Electrodes are normally used with a suitable holder and, wherever possible,should be suspended vertically down- ward from the top of the tank or other vessel containing the liquid.Also,electrodes are connected to the sensing circuit of a BIW relay.While this is a low energy circuit with inherently limited low current,the electrodes are terminals of a live electrical circuit and must be installed to prevent con- tact by unauthorized personnel.
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