Liquid Level sensors
Flexible, innovative
Add to note list


The OLT optical liquid level switches use solid state technology with no moving parts for highly accurate and reliable measurements. The sensors plastic TROGAMID® housings provide high chemical resistance and excellent media compatibility. With their miniature threaded housings the OLT sensors are easy to install and consume little space.

The OLT series can be used with many liquids which are not compatible with conventional polysulphone housings such as fuel, halogenated hydrocarbons (e.g. chloroform), methanol, acetone and ethyl acetate. Furthermore, TROGAMID® can also be used in direct contact with food and drinking water.

OLT liquid level switch
Technical specifications
Output Output current

100 mA or 1 A

TTL compatible or transistor
Supply voltage   4.5...15.4 V or 8...30 V
Wetted materials (tip/housing)   Trogamid
Sensor connection M10 or M12 thread

For price and delivery information or any other question please contact First Sensor.
First Sensor AG is among the world's leading providers in the area of sensor technology. Our company develops and manufactures both standardized and tailor-made sensor solutions for applications in the industrial, medical and mobility growth markets. We will be among the top three providers in our core markets by 2019.
Investor Relations
Our investor relations activities aim at raising the international publicity of First Sensor AG and at consolidating and extending the perception of our share as an attractive growth stock. This means we keep our online communication transparent, comprehensive and continuous in order to enhance your trust in our share.
In many market-specific applications, sensors are components that are critical to your success. First Sensor is the partner you need on projects that call for careful selection, customized adaptation and the highest standards of excellence. Our Business Units Industrial, Medical and Mobility are clearly aligned to the core markets of industrial applications, medical technology as well as automotive and transport.
Electronic engineering & manufacturing services
First Sensor specializes in the development and manufacture of custom sensors, electronics, modules and complex systems. As a solution provider the company offers complete development services from a first draft and proof of concept up to the development of prototypes and finally serial production. First Sensor offers comprehensive development expertise, state-of-the-art packaging technologies and production capacities in clean rooms from ISO class 8 to 5.
Innovation, excellence, proximity – these are our values, our ambition, our drive. Anything less is not an option Our sensor solutions stand for technical innovation and economic growth. As such, they form the basis for the development and application of new technologies in almost all areas of life. We aim to shape this future together with you.