Temperature Measuring Device With Reference Sensor Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Invasive temperature measuring devices in industrial processes lead to flow energy losses, abrasion, obstruction of cleaning processes, and potential leakages, while non-invasive devices suffer from inaccurate measurements due to thermal interaction with the environment and slow thermal equilibrium, resulting in delayed compensation algorithms.
Innovation Solution
A temperature measuring device with a measuring sensor and a reference sensor connected via mineral-insulated sheathed lines, where the measuring sensor is thermally connected closer to the surface than the reference sensor, creating a thermal resistance ratio that enhances dynamic measuring accuracy and reduces environmental influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a non-invasive temperature measuring device is used, then flow energy losses and abrasion are avoided, but measurement accuracy deteriorates due to thermal interaction with the environment
Solution Approach 1:
The patent introduces a reference sensor as an intermediary element that measures the ambient temperature to which the measuring sensor is thermally exposed. This reference measurement allows the system to compensate for environmental thermal influences through calculation, thereby maintaining measurement accuracy without requiring invasive contact with the medium.
Solution Approach 2:
The patent changes the measurement approach from directly measuring the medium temperature to measuring both the surface temperature and ambient temperature, then calculating the medium temperature through parameter transformation. This allows the system to account for thermal gradients and environmental effects mathematically.
2Stability of the object's composition
If the reference sensor is placed far from the process, then environmental temperature stability is improved, but thermal equilibrium response time increases
Solution Approach 1:
The reference sensor is pre-positioned in the transmitter head at a location that provides stable ambient temperature measurement before the measuring sensor undergoes thermal transients. This preliminary positioning allows the system to have the reference temperature ready for immediate compensation calculations when process temperature changes occur.
3Object-affected harmful factors
If thermal insulation is added to the transmitter head, then environmental influence on measurement is reduced, but the actual effect becomes unknown
Solution Approach 1:
The reference sensor provides continuous feedback about the actual thermal conditions at the transmitter head. This feedback allows the system to dynamically compensate for any thermal insulation effects or environmental influences without needing to know or control the exact amount of insulation present. The system adapts to the actual thermal state rather than relying on theoretical insulation models.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves improved dynamic measuring accuracy and compact design by ensuring reproducible thermal conditions at the measuring point, minimizing deviations from the actual surface temperature, and allowing for rapid temperature changes to be accurately compensated.
Implementation Method 1
the first and second supply lines each comprise mineral-insulated sheathed lines with an outer sheath of metal, the outer sheath enclosing at least two inner conductors which are insulated from the outer sheath with highly compressed metal oxide powder
Implementation Method 2
Ideally, such a sensor should assume the temperature of the medium, which is enclosed by the surface. If, for example, the temperature sensor is designed as an electrical thermocouple, the temperature of the sensor and thus the temperature of the medium can be inferred by measuring the thermoelectric voltage, provided that both are in thermal equilibrium
Implementation Method 3
If, for example, the temperature sensor is designed as an electrical thermocouple, the temperature of the sensor and thus the temperature of the medium can be inferred by measuring the thermoelectric voltage
Data Source
AI summary
A temperature measuring device for determining a temperature of a medium via a temperature of a measuring point on a surface surrounding the medium includes: at least one measuring sensor; at least one reference sensor; and a measurement value processing means, which is connected via a first supply line to the at least one measuring sensor and via a second supply line to the at least one reference sensor. The first and second supply lines each are mineral-insulated sheathed lines with an outer sheath of metal, the outer sheath enclosing at least two inner conductors which are insulated from the outer sheath with highly compressed metal oxide powder. The at least one measuring sensor is connected to the at least two inner conductors of the first supply line and the at least one reference sensor is connected to the at least two inner conductors of the second supply line.