Ultrahigh precision digital thermometric indicator replacing precise mercury thermometer

Abstract

The invention discloses an ultrahigh precision digital thermometric indicator replacing a precise mercury thermometer, comprising a supporting body, a printed circuit board, a temperature detection device and a display. The temperature detection device selects a double-bead cascade connection compensation structure or a double-bead complementary parallel-serial compensation structure, wherein the double-bead cascade connection compensation structure employs a second thermistor to be in cascade connection with a third thermistor to form a complementary temperature detector; the double-bead complementary parallel-serial compensation structure employs a fourth thermistor to be in cascade connection with a fifth thermistor to form a first cascade connection compensation structure; then the first cascade connection compensation structure is in parallel connection with a third compensating resistor to form a second parallel structure, and the second parallel structure is then in cascade connection with a fourth compensating resistor to form the temperature detection device. The thermometric indicator has the advantages of high precision and great stability.

Description

technical field [0001] The invention relates to a temperature measuring tool, in particular to an ultra-high-precision digital thermometer replacing a precision mercury thermometer. Background technique [0002] In the field of temperature measurement, the tools that can be used for high-precision temperature measurement are nothing more than two categories: electronic instruments and mercury thermometers. At present, the electronic instruments that can be used for high-precision measurement are still limited to instruments made of platinum resistors as temperature-sensing elements, but because the resistance value of platinum resistors changes with temperature changes, the variation is very small, and the circuit of the whole machine is relatively complicated. , so that the volume of the whole machine is large and the cost is high, it is difficult to popularize and promote. [0003] At present, almost all departments that need high-precision temperature measurement, such a...

AI Technical Summary

Problems solved by technology

At present, the electronic instruments that can be used for high-precision measurement are still limited to instruments made of platinum resistors as temperature-sensing elements, but because the resistance value of platinum resistors changes with temperature changes, the variation is very small, and the circuit of the whole machine is relatively complicated. , so that the whole machine is bulky and expensive, making it difficult to popularize

[0003] At present, all departments that require high-precision temperature measurement, such as meteorology, petroleum, temperature standards, and scientific research, almost always choose mercury thermometers as the only measurement tool, although mercury thermometers will cause harm to the human living environment during production and use. incalculable harm

However, there is no ideal product that can replace it, so that this phenomenon has continued for hundreds of years.

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