Most optical level switches are not designed to be completely submerged in liquid. These switches are designed to screw into the vessel/pipe so that only the conical tip is exposed to the liquid. This ensures minimal intrusion into a vessel. The rear of the switch, where the cable/wires exit should be protected from immersion (occasional water splashes are OK), unless a secondary seal is added.
However, SST’s POS range of switches CAN be immersed in water. POS switches with integrated cables are sealed to IP68 and the M12 connector version is sealed to IP67.
The SST technical support team can also help – the team will want to know about any electrical specifications and environmental conditions the switch will be exposed to:
- What is the application for the switch?
- What is the supply voltage?
- What is the liquid type?
- What are the pressure and temperature conditions?
- What does the output of the switch connect to or need to directly drive?
- Is there a specific thread size required?
Please supply as much information and specification information to the team as possible, as this will help them to quickly identify the most suitable liquid level switch for your application. If your project has a large quantity requirement then that should be stated early in the communications. Ask Our Experts for their help and support.
The benefits of the optical technology are:
- Reliability: There are no moving parts and can require less maintenance in the long term. The optical technology has a long operational life. Float switches can jam or in extreme cases break, allowing debris into the process.
- Save on space: Only the tip of the switch needs to protrude and be in contact with the liquid.
- Sensitivity: The optical switch needs minimal contact with liquid for the switch to operate. Float switches generally need a substantial level to do so.
- Design Time: Our switches are designed to operate in a wide variety of liquids and environments. Different output drive options allow connection to almost any type of load: from low power indication of liquids to a microcontroller operating on a 3V3 supply; to directly driving a motor, pump or relay operating at up to 40Vdc. This can mean you have less design work to do and the switch itself can drive specific load connected to its output.
Converting to optical technology should be a simple process, but not necessarily a drop-in replacement. For example, SST liquid level switches work with a regulated DC voltage supply whereas many float switches can operate with an AC mains voltage. SST has the widest range of optical liquid level switches to meet your application requirements and our technical team are happy to help you integrate them into your system.
If you would like to Ask our Experts for some advice, please supply as much application and specification information to the team as possible as this will help them to quickly identify the most suitable level switch for your application.
Please refer to the Installation, Operation and Compatibility Guide for information on materials and suitability of the switches.
SST are interested in learning which certifications and specifications you need for specific applications. Please submitted details to email@example.com