Level-sensors-First-Sensor
Liquid level sensors
Flexible, innovative

Level measurement technologies

The range of liquid level sensors of First Sensor are based on pressure and optoelectronic measurement technologies and offer point level detection as well as continuous level measurement. Important factors which influence the appropriate sensor selection include the size, geometry, material of the tank/container, existing tank installations such as e.g. agitators as well as the type of process media.

Hydrostatic level measurement

A fluid column generates a hydrostatic pressure at the bottom of a tank or reservoir which is a function of the height and density of the liquid. A pressure sensor can measure the hydrostatic pressure and the liquid level can be determined after calibration to the specific density of the process media. In vented tank or open container applications gage pressure sensors which measure relative to atmospheric pressure are used to avoid false results due to barometric pressure fluctuations. In pressurised tanks the difference between the pressure at the bottom of the tank and the gas pressure above the liquid surface has to be measured. This can be done by two individual gage pressure transmitters or one differential pressure sensor.

First Sensor offers two different versions of hydrostatic liquid level transmitters: submersible level probes for immersion into the liquid or sensors with threaded ports which will be externally mounted through the tank wall.

Hydrostatic Level Measurement

Figure 1: hydrostatic level measurement

Optoelectronic level measurement

Optoelectronic level switches contain a light source (LED) and a light receiver (phototransistor). In air or gas light emitted from the LED is reflected back to the phototransistor in the tip of the sensor by total internal reflection. With liquid surrounding the sensor tip light is refracted into the liquid and a weaker signal reaches the phototransistor, which actuates a switching output.

First Sensor optical point level sensors include basic devices with analog phototransistor outputs, models with microprocessor compatible TTL signals, or high power switches with transistor outputs. With their housings of plastic (either polysulphone or TROGAMID®) or stainless steel the sensors provide excellent media compatibility.

Optoelectronic Level Measurement

Figure 2: optoelectronic level measurement

Company
First Sensor is one of the world's leading suppliers in the field of sensor systems. In the growth market of sensor systems, First Sensor develops and produces customer-specific solutions for the ever-increasing number of applications in the industrial, medical, and mobility target markets. Our goal here is to identify, meet and solve the challenges of the future with our innovative sensor solutions early on.
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In the growth market of sensor systems, First Sensor develops and produces customer-specific sensors, electronics, modules and complex systems for the ever-increasing number of applications in the industrial, medical, and mobility target markets. 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.
Competencies
In the growth market of sensor systems, First Sensor develops and produces customer-specific sensors, electronics, modules and complex systems for the ever-increasing number of applications in the industrial, medical, and mobility target markets. 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.
Career
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.

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