In most cases, factories have the chance to choose between a high level switch or a transmitter for applications where both sensors can be used. For example, a factory could use both a high level switch or a transmitter to sound an alarm if the level of a liquid gets too high. So when both systems can be used, which is better for the job?
Cost: In general, level switches are much less expensive than transmitter switches. Level switches have fewer parts, are easier to install, and do not provide as in-depth readings as transmitter switches. This makes the cost of implementing high level switches much less, but it may be necessary to sacrifice some on the quality of the reading. In some cases, a transmitter will cost more to operate than a level switch, but only if a separate conduit is necessary for the use of the transmitter.
Information: A level switch only identifies the level of the liquid in the tank. It does not give any more detailed information than that. A transmitter switch, however, can identify a large variety of data, including comparison ratings at different levels, changes in the liquid based on the level, and monitor the liquid before problems arose. A simple level switch could only indicate the level of the liquid once it rose to critical levels.
Ease of use: Both level switches and level transmitters are easy to use. Overall, however, high level switches are easier to use, simply because they are simpler measuring devices and require no additional data reading or interpreting to use. For simple, non-critical applications, a level switch can usually do the job without problems.
Reliability: Occasionally, it is necessary to retest the date provided by a level switch. Sometimes the material inside the container can change the reading if there is an air pocket or if the liquid bubbles up unexpectedly. Usually, it is not necessary to retest data presented by a transmitter because it can provide a wider range of comparison data.
So which switch type is better? It really depends on the application and budget for the project.