Liquid Level Switches
TE Connectivity (TE) offers liquid level sensors with reed switch reliability in numerous standard and custom configurations. Our single point fluid level switches can be arranged to have the switching element "close" or "open" when the level decreases. Switch orientation options include horizontal and vertical (top or bottom entry), depending upon the configuration chosen. All of our housings have at least IP-65 enclosure rating and both external and internal fit liquid level switches are available.
- Various UL and WRAS-approved liquid level switches are available with various fittings and options
- Side entry switches can be configured with push-fit or threaded designs, cable or integral connectors, as well as vertical float sensing with side mount configurations
- Vertical mounting is available in a wide range of materials and installed internally or externally
- Switches are available in a range of plastics suitable for boiling water and fuel applications
- Switches can be configured with up to three floats and up to one meter long
- Analog output designs are available
Materials used on our liquid level sensors include:
- Glass-filled polymers such as PPS
- Stainless steel
Silicone sealing materials are standard with Nitrile and EPDM (Flourorubber is also available)
Why use a “reed switch / magnetic float” based level sensor?
The following are the key benefits of using a reed switch/magnetic float level sensor:
- A magnetic reed switch is a low-cost approach to answering liquid-level sensor needs
- It requires no power source to facilitate the switching action and is solely the result of the interaction of the permanent magnet in the moving element (float) with the reed switch
- The high insulation value of the reed switch means that the “switched off” current draw is lower than what can be achieved with a solid-state electronic device. This can be particularly useful, for example in battery-powered applications
- The use of a float as the sensing medium means that changes in liquid properties such as dielectric strength, viscosity, liquid concentration, etc., have a minimal bearing on the sensor operation
- In dynamic applications, the natural hysteresis of the reed switch means that the effects of liquid turbulence can be minimized
- Due to the high potential operating temperature of the reed switch custom level sensors can be manufactured with temperature capabilities far more than those for solid-state electronics
- As the reed switch is a passive device, no EMC testing is required. This is useful in reducing lead times and costs in product development.
Liquid Level Switch
|Agriculture Water / Chemical Tank Level
||Variety of outputs available. Used to control other inputs or outputs of the system
||Simple on/off control minimizes additional electronics and hardware
|Fuel Level||Easy installation with simple mounting hardware with standard thread sizes
||Allows sensor to be mounted quickly and securely
|Housing materials are available in polypropylene, nylon and PPS||Compatible with water, fuel oils and higher temp and corrosive applications|
|Automatic Car Wash Systems||High or low level sensing||Minimizes workload on central control system
|Internal or external fitting to control how the sensor is mounted
||Provides flexible mounting configurations to adapt to a variety of tanks and systems
|Cooling Systems||Reed switch senses and switches based on magnet location
||Proven switch technology with many years of application use
|The sensor is sealed in the system
||Provides reliable seal and minimizes chance for leaks
|Foam Systems||Wide operating range from -30°C to +105°C
||Able to operate in severe environments including outdoors
|Threading and lengths for mounting in system are available in both metric and English sizes
||Compatible with a range of liquid systems throughout the world|
|Carpet Cleaners / Floor Scrubbers||Suitable to withstand harsh environments where shock or high vibrations may occur||Reliable sensor functions over the life of the equipment
|Can operate at standard line voltages
||Requires no transformers or other electronics to function
Frequently Asked Questions - Liquid Level Switches
Q: What mounting configurations are available?
A: Configurations are available for top and bottom mounting as well as horizontal or side mounting. Internal and external fit versions are also available.
Q: What is the typical operating temperature range?
A: Typical operating temperature range is -30°C to +130°C, but can vary by product type and materials.
Q: What type of output options are available?
A: Output types range from "normally open" or "normally closed" in both single pole single throw (SPST) and single pole double throw (SPDT) variations.
Q: What types of liquids are compatible with these switches?
A: The switches can be used in a wide variety of liquids including potable water, wastewater, coolant, fuel tanks, urea tanks, and hydraulic systems.
Q: What is the maximum switching voltage allowable?
A: Typically, the switches can handle 250VAC or 200VDC, but it varies by model number.
Q: What type of switching technology is used in these switches?
A: TE’s liquid-level switches utilize reed switch technology which is an electrical switch operated by an applied magnetic field. Reed switch technology is a technology with many years of proven reliability.