This project includes two main activities:
1. Further development of the BEV prototype of a stabilisation chamber for air temperature measurements, called "Air Temperature Calibration System - sub chamber (ATCS sub chamber)" in climatic and environmental chambers.
2. Development of a unified calibration procedure for industrial temperature sensors with corresponding standard specifications for calculating the measurement uncertainty budget.
Background and need:
Currently, there are no specifications or guidelines for uniformly performing air temperature measurements from industrial temperature sensors. To ensure comparability and proper calibration of industrial sensors, a standard procedure is essential. This includes, above all, specifications as to how a measuring system for air temperature measurements in climatic and environmental chambers must look and which measured variables must at least be taken into account (temperature, humidity, pressure, wind speed, ...). In addition, a standardisation for the establishment of a measurement uncertainty budget is useful in order to achieve comparability of the measurement results.
Task 1: Education and investigation
In order to bring all involved persons to the same state of the art (already existing BEV prototype of the ATCS sub chamber for air temperature measurements in a climatic chamber), meetings and workshops will be held at the two institutes (BEV and SMU).
Detailed project description (project profile):
- Goal and objective description
- Detailed description of the individual tasks
- Strategic relevance
- Budget planning/cost estimation and cost/benefit comparison
- Risk assessment
In addition, the prototype is to be further developed and improved together in this phase. In this task, the individual measurement parameters for the measurement system and an ideal mounting of the ATCS sub chamber will be selected.
Additionally, various types of temperature sensors typically used in industry (automotive industry, food industry, metrology, etc.) will be selected.
Task 2: Design of ATCS sub chamber
Various types of temperature sensors typically used in industry will be tested.
After construction of the improved version of the stabilisation chamber, test measurements with test constructions of inferior material (3d print) are carried out at both institutes. If these are satisfactory, the ATCS sub chamber can be commissioned for manufacture with the optimally selected material (aluminium, copper, or similar).
Task 3: Development of the calibration procedure and preparation of the measurement uncertainty budget
The purpose of this task is to describe and define the measurement system and procedure for the calibration of temperature sensors in climatic and environmental chambers. This includes the determination of the measurement parameters to be taken into account at least (besides temperature also humidity, pressure, wind speed) and the establishment of the measurement uncertainty budget (which minimum contributions must be taken into account at least, like inhomogeneities of the environment, heat conduction, self-heating, etc.).
For the recording of the measurement data and for the analysis of the measurement data, a protocol is to be created that is to serve as a support for the users for the analysis of the measurement data and ensures a comparable presentation of the measurement results.
Task 4: Comparison measurements
If the preliminary results are satisfactory, a "twin" of the subchamber is produced for the participating institutes.
Finally, comparative measurements are made according to specifications for the measurement system to be used and for the calculation of the measurement uncertainty budget for the calibration of air temperature measurements for industrial sensors and climate and environmental chambers.
As an output, a description of the above-mentioned specifications will be a document that can be used as a guideline.
For the implementation of the project (personnel costs, travel expenses, transport/shipping, material costs, measurements/measurement set-up, ...) all costs are covered by the participating institutes themselves.