Works on Liquids, Solids, and Interfaces
the Delta Controls Model 103 / 105 Datasheet
The Delta Controls Model 103 and 105 probe type level switches use RF Admittance technology to produce switching action when a material level crosses the setpoint of its sensing probe. Many probe configurations are available. The proper style is determined by the service.
The interface position between two liquids with different dielectric constants can be accurately detected by the switches. The units will even average out a cloudy interface and produce a precise switching action as its position passes the set point. A limitation is that one of the liquids must be nonconductive. They are not sensitive to SPG (specific gravity) variations. Water/hydrocarbon interfaces produce excellent results. Detecting a liquid interface as it moves down a pipeline is another useful application.
The Delta Controls Model 103, 105 utilizes admittance technology to measure how much of its sensing probe is covered by the liquid. This is accomplished by generating a radio frequency pulse of energy which travels from the sensing probe to the ground reference (usually the tank wall). The amount of liquid between the two determines how much energy is transferred. The amount of energy flowing (very small and low level in all cases) is a highly repeatable measure of the liquid level or interface position. The amount is compared to an internal reference and produces a switching action at a selected material elevation.
Integral mounting on the probe head produces a simple one-piece unit which generally results in the lowest installed cost. Alternately, the Delta Controls Model 105 electronics module may be located up to 50 feet away from the probe. A coaxial cable then connects the remote electronics to the sensing probe.
The level probe may be mounted in any position; vertical, horizontal, or at an angle. Horizontal mounting is usually preferred for alarm action because it provides the sharpest switch point definition. The Model 105, with adjustable differential action (where the OFF setpoint is different from the ON setpoint) requires that the probe be mounted either vertically or at an angle. The material level must move past the two points on the probe where switch action is to occur.
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