Current research projects

Image Performance tests of refrigerant compressors
Image Humidifier System for High-Purity Gases
Image Behavior of multiphase cryogenic fluids
Image Cryogenic liquid piston pumps for cold liquefied gases like LIN, LOX, LHe, LH2, LNG, LAr
Image In-situ investigation concerning the swelling behaviour of polymer materials under elevated pressures and temperatures
Image Swirl-free on the move...
Image Preformance measurements of heat exchangers
Image Thermal engines
Image Cold meter
Image Software modules
Image Thermostatic Expansion Valves
Image Software for technical building equipment
Image Pulse-Tube-Refrigerator with sealed compressor
Image Intelligent innovative power supply for superconducting coils
Image Cool Up
Image Electrochemical decontamination of electrically conducting surfaces „EDeKo II“

You are here:   /  Home


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

Image

Software modules

Software for properties of refrigerants

Image

Verification of storage suitability of cryo tubes

Artificial aging of primary packaging for biobanking applications

Image

Preformance measurements of heat exchangers

Is the heat exchanger properly sized?

Image

Innovative small helium liquefier

Liquefaction rates from 10 to 15 l/h

Image

Filter Tests

INDUSTRIAL AND LABORATORY PRECIPITATORS