Temperature compensated strain gauge pressure transducer
The strain gauge pressure transducer addresses inaccurate temperature compensation by integrating a thermistor sensor and sapphire membrane with a heat-insulating cover, improving accuracy and reducing dimensions while enhancing reliability.
Patent Information
- Authority / Receiving Office
- RU · RU
- Patent Type
- Utility models
- Current Assignee / Owner
- LLC MIKROTENSOR LLC MIKROTENSOR
- Filing Date
- 2025-12-30
- Publication Date
- 2026-07-06
AI Technical Summary
Existing strain gauge pressure transducers suffer from inaccurate temperature compensation due to the temperature compensation converter being located away from the membrane with strain gauges, leading to temperature differences that reduce accuracy.
A temperature-compensated strain gauge pressure transducer design with a sapphire membrane and thermistor sensor on a nozzle, protected by a sleeve and heat-insulating cover, and a measuring circuit outside the transducer, using petal electrical contacts and insulating bushings to minimize temperature influence and reduce dimensions.
Enhances temperature compensation accuracy, reduces the transducer's dimensions and weight, and increases reliability by minimizing structural elements and failure risks.
Smart Images
Figure 00000001_ABST
Abstract
Description
[0001] The utility model relates to measuring equipment and can be used to measure and control the pressure of gas and liquid media in various fields of technology.
[0002] The closest analogue to the utility model is a strain gauge pressure transducer containing a housing with a cover and a connector placed on it for connecting an electric power supply and communication cable, a membrane with strain gauges built into the housing, an electronic board for signal processing (see patent for utility model of the Russian Federation No. 212293, G01L 9 / 04, published 2022).
[0003] However, the disadvantage of this converter is that the temperature compensation of the pressure conversion error is not objective and correct enough, since the temperature compensation converter is not located in the immediate vicinity of the membrane with strain gauges, but on the electronic board for signal processing, which is located outside the pressure converter housing, therefore the temperature conditions on the electronic board differ from the temperature conditions on the membrane with strain gauges, which reduces the accuracy of temperature compensation of the pressure conversion error.
[0004] The technical problem that the utility model is aimed at solving is to increase the accuracy of temperature compensation of errors by reducing the influence of the external ambient temperature on the temperature difference between the compensation thermistor sensor and strain gauges, and by reducing the overall dimensions and weight of the pressure transducer.
[0005] The solution to the technical problem is achieved in that a temperature-compensated strain gauge pressure transducer comprising a housing with a cover and a nozzle with a channel for supplying pressure, wherein a sapphire membrane with semiconductor strain gauges made of monocrystalline silicon applied thereto is placed on the end of the nozzle, according to the utility model, a compensating temperature-resistive sensor is glued to the outer cylindrical surface of the nozzle with heat-conducting glue, wherein the membrane and the compensating temperature-resistive sensor are protected from the external environment by a sleeve and a heat-insulating cover, the measuring circuit is located outside the transducer, the connector is a structure of petal electrical contacts pressed into a heat-insulating sleeve of connecting wires and electrical insulating bushings pressed into openings of the cover.
[0006] The technical result consists in increasing the accuracy of temperature compensation of the pressure conversion error by reducing the influence of the external ambient temperature on the temperature difference between the compensation thermistor sensor and strain gauges, reducing the overall dimensions and weight of the pressure transducer, reducing the number of structural elements of the transducer, which reduces the risk of failure of the pressure transducer and increases its reliability.
[0007] The essence of the utility model is explained by the drawing, where Fig. 1 shows a strain gauge pressure transducer with temperature compensation.
[0008] The temperature-compensated strain gauge pressure transducer comprises a housing 1 with a cover 2 and a nozzle 3 containing a channel 4 for supplying pressure, wherein a membrane 5 made of sapphire with semiconductor strain gauges made of monocrystalline silicon applied to it is placed on the end of the nozzle, and a thermistor sensor 6 is glued to the outer cylindrical surface of the nozzle 3 with heat-conducting glue, wherein the membrane 5 and the thermistor sensor 6 are protected from the external environment by a sleeve 7 and a heat-insulating cover 8, which ensures an increase in the accuracy of temperature compensation of the error by reducing the influence of the external ambient temperature on the temperature difference between the compensation thermistor sensor and the strain gauges placed on the membrane 5, and the measuring circuit is located outside the converter, the connector is a structure of petal electrical contacts 9 pressed into a heat-insulating sleeve 7,connecting wires 10 and electrical insulating bushings 11, pressed into the openings of the cover 2, which ensures a reduction in the overall dimensions and weight of the pressure transducer.
[0009] Thus, the proposed technical solution differs from the prototype by the presence of new features, mutual arrangement and form of execution, which impart new properties to the object, manifested in the technical result.
[0010] The temperature compensated strain gauge pressure transducer operates as follows.
[0011] When pressure of the working medium is applied through nozzle 3 with pressure supply channel 4, sapphire membrane 5 and the semiconductor strain gauges made of single-crystal silicon applied to it are deformed. Due to the deformation, the electrical resistance of the semiconductor strain gauges changes proportionally to the change in working medium pressure. Thermistor sensor 6 is glued to the outer cylindrical surface of nozzle 3 with thermally conductive adhesive. Membrane 5 and RTD sensor 6 are protected from the external environment by sleeve 7 and thermal insulating cover 8. This improves the accuracy of temperature compensation by reducing the influence of the external ambient temperature on the temperature difference between the compensation RTD sensor and the strain gauges placed on membrane 5.In this case, the design of the temperature-compensated strain gauge pressure transducer has reduced dimensions and weight, compared to the prototype, since the measuring circuit is located outside the transducer, and the connector is a design of petal electrical contacts 9, pressed into the sleeve 7, connecting wires 10 and electrical insulating bushings 11, pressed into the holes of the cover 2.
Claims
A temperature-compensated strain gauge pressure transducer comprising a housing with a cover and a nozzle with a channel for supplying pressure, wherein a sapphire membrane with semiconductor strain gauges made of monocrystalline silicon applied thereto is placed on the end of the nozzle, characterized in that a compensating temperature-resistive sensor is glued to the outer cylindrical surface of the nozzle with heat-conducting adhesive, wherein the membrane and the compensating temperature-resistive sensor are protected from the external environment by a sleeve and a heat-insulating cover, the measuring circuit is located outside the transducer, the connector is a structure consisting of petal electrical contacts pressed into a heat-insulating sleeve, connecting wires and electrically insulating sleeves pressed into openings in the cover.