Current research projects

Image Breakthrough Sensor for Adsorption Filters (BelA)
Image Multifunctional electronic modules for cryogenic applications
Image Overall System Optimization of Refrigeration Plant Systems for Energy Transition and Climate Protection
Image Filter Tests
Image Performance tests of refrigerant compressors
Image Brine (water)-water heat pump
Image Micro fluidic expansion valve
Image Innovative Manufacturing Technologies for Cryosorption Systems
Image Micro heat exchangers in refrigeration
Image Range of services laboratory analyses
Image Combined building and system simulation
Image Performance tests of condensing units
Image Panel with indirect evaporative cooling via membrane
Image Computational fluid dynamics CFD
Image Development of test methods and test rigs for stationary integrated refrigeration units
Image Tensile and compression testing

You are here:  Home /  Research and Development


Multifunctional electronic modules for cryogenic applications

Euronorm GmbH

Dr. Norbert Gust

+49-351-4081-5112

Electronic with less wiring effort - more than 100 sensors via one feedthrough

The aim of the R&D project was the development of multifunctional electronic modules that enable the operation of a large number and variety of sensors to be used for cryogenic applications.

Usually, cryogenic sensors are located in cryostats and all cables have to be decoupled via feedthroughs, which leads to an increased heat input. To avoid this, we have developed and implemented various multiplexers as a part of the project, which work well under cryogenic conditions, see Figure 1 (left). The multiplexers are designed for an operation with a 10-wire bus system with arbitrary expandability. The multiplexers were developed and optimized for minimum interference, maximum function and compactness.

Another major goal of the R&D project was the development of a universal measuring bridge for any sensors, see Figure 1 (right). As a result, different electronic multifunction modules and cold multiplexers were developed, realized and validated. These modules are characterized by the fact that any sensors can be connected by means of a universal circuit board design. The selection of the modules was modular, which is why special components were selected and tested depending on the requirements. Among the options are: Different references (resistance, voltage), amplification factors, active shielding, battery operation, displays (TFT, LCD), interfaces (RS485, USB), storage options (SD card), electrical isolation, interface to multiplexers, and type of housing.

During development, special attention was paid to electromagnetic compatibility and interference sensitivity during switching operations, such as in heater control. The accuracy is determined by reference resistors and voltages. In addition, the time response of the facial expressions was a key parameter of the development in order to ensure a fast and stable measurement.

Within the R&D project a software was programmed which is available as a universal platform for any configuration of modules. The modules can be in-house developments or commercially available products. Each controller supports a freely definable number of sensors, actuators, controllers and binary inputs and outputs. Each sensor, actuator and controller can represent any common physical quantity. These include temperature, pressure, level, voltage, current, resistance etc.

With our development of a universal temperature measuring bridge, any temperature sensors can be read out with high accuracy, see Figure 2.


Your Request

Further Projects - Research and Development

Image

Low Temperature Tribology

Tribological studies at cryogenic temperatures

Image

Refrigerants, lubricants and mixtures

Determination of working fluid properties

Image

Reduction of primary noise sources of fans

...using numerical and experimental methods with contra-rotating axial fan

Image

Micro fluidic expansion valve

for increasing of the efficiency of small and compact cooling units

Image

Hydrogen and methane testing field at the ILK

Simultaneously pressures up to 1,000 bar, temperatures down to –253°C