Level sensors

Continuous measurement

For continuous level measurement the level is detected continuously, con-verted into an electrical signal and indicated. Depending on the type the units have freely programmable switching outputs or an analogue output for further processing.
Type
probe length from 150 up to 1600 mm Pressure sensor submersible pressure transmitter Optical level sensor
Material
metal plastics
Connection
cable connector
Detection
in contact with the medium
System
hazardous areas (ATEX) high temperature leakage monitoring overflow prevention level and temperature
Application
oils coolant emulsions cleaning liquids water and aqueous solutions Wastewater weak acids and alkalis plastic granulates and bulk material hygienic systems viscous media and liquids with suspended particles food industry
 

Point level measurement

For limit detection a defined level reached is detected and converted into an electrical switching signal. Thanks to the microprocessor technology the user can adjust the sensors to the medium by pressing buttons. The integrated electronics ensure an exact repeatability of the set switch points.
Type
thread M18 rectangular probe length from 132 bis 737 mm
Material
metal plastics
Connection
cable connector terminals
Detection
through the non-metallic vessel wall in contact with the medium
System
hazardous areas (ATEX) high temperature leakage monitoring overflow prevention
Application
oils coolant emulsions cleaning liquids water and aqueous solutions Wastewater weak acids and alkalis plastic granulates and bulk material hygienic systems viscous media and liquids with suspended particles food industry
 

Switching amplifier for Namur sensors according to 94/9/EG (ATEX)

NAMUR switching amplifiers evaluate the sensor signal and control the output. They meet all requirements of the ATEX directives. Switching amplifiers with relay and active transistor and potential-free optocoupler outputs are available. The control circuits hold the approval Ex II (1) GD [EEx ia] IIC. The amplifiers are designed for the connection to NAMUR sensors according to DIN EN 60947-5-6 and mechanical switches. They provide the supply voltage for the intrinsically safe circuit.
Type
housing for rail mounting
Output
1x relay 2x relay 2x opto coupler 2x DC PNP
 

Evaluation units for level monitoring / control

By means of the evaluation units for level monitoring / control, tank or medium cotainers are monitored and controlled using point level sensors. The evaluation units have integrated modern switched-mode power supplies to supply the sensors with voltage. With a power-on delay time the sensor signals can be damped to suppress unintentional switching (e.g. in the event of waves). The pumps / valves of the container can be controlled using a two-point control or they can be deactivated for dry running or overflow protection for a definable period of time.
Application
Limit level monitoring Two-point control
 

More information

System description - Level sensors