Featured Application: Back to Basics – How to identify the correct sensor for the application

Liquid level sensors are reasonably simple, cost-effective devices that perform well in various environments when selected correctly. The measurement of fluid in a vessel is critical to triggering an outcome in a system – for example, the introduction of more fluid, an alarm, pump control, etc. In order to be sure that the desired outcome is achieved, the proper sensor must be selected. To make this selection, the specifier should have answers to the following (or refer to our Sensor Decision Tree):
What is the particular application?
What sensor technology is required? Manufacturers such as Madison manufacture point level sensors (single and multi-point float style, conductivity and optical), as well as continuous level sensors (float, visual, pressure, ultrasonic and radar).
What is the tank or measurement depth?
What is the tank material?
What is the sensing distance or level(s)?
Is the sensor mounting internal or external? Horizontal or vertical?
What type of fitting is required (NPT, bulkhead, etc)?
What type of fitting material is required (polypro, stainless, brass)?
What is the fluid type? Petroleum? Water? Chemical?
What is the maximum temperature and pressure of the fluid during operation?
What is the maximum pressure of the fluid during operation?
Does the fluid contain solids?
What is the required output type (normally open, normally closed, 4-20A, resistive)?
What will the sensor connect to (relay, PLC, pump)?
What lead length is desired?
Will a connector be needed?
Will third party certifications be required such as NSF or UL Haz Loc?
The specifier can now describe the need correctly to a manufacturer such as Madison. If modifications or special requirements are needed, Madison can create custom sensors and float switches in just 6 days. To find out more about specifying liquid level sensors, give Madison a call at 800-466-5383 or use the Quick Contact Form!