Diaphragm pressure transmitter filling liquid

Abstract

The invention discloses diaphragm pressure transmitter filling liquid which comprises a transmitter. A liquid channel is arranged in the transformer, and liquid is filled in the liquid channel; the liquid is of liquid potassium sodium alloy with content of potassium greater than 50%; the content of potassium in the liquid potassium sodium alloy is 78%, and the content of sodium is 22%. By the arrangement, temperature application range is greatly increased from -12.6DEG C to 880DEG C, evaporation of the liquid under higher temperature is effectively prevented, a measuring device is protected, and service life of the measuring device is prolonged; autothermal expansion is low, thermal expansion is low under the high temperature, impact to the measuring device is small, and precision of the measuring device is improved.

Description

technical field [0001] The present invention relates to liquids used in pressure transmitters, especially diaphragm pressure transmitter fill liquids. Background technique [0002] In the diaphragm pressure transmitter, the liquid channel (capillary or larger pipe) needs to be filled with liquid, and the pressure signal is transmitted through the liquid. Now it is usually filled with hydraulic media such as silicone oil, mineral oil, and vegetable oil. ;The working temperature of this kind of commonly used filled liquid medium is usually within 400°C, and the corresponding temperature range is relatively narrow. In the case of high temperature, the medium is easy to vaporize, and once the medium is vaporized, it is easy to damage the measuring device; also, this The thermal expansion of such liquid itself is relatively large, which has an adverse effect on the measurement accuracy. Thermal expansion is a systematic error, which is difficult to eliminate. As a result, the acc...

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Problems solved by technology

[0002] In the diaphragm pressure transmitter, the liquid channel (capillary or larger pipe) needs to be filled with liquid, and the pressure signal is transmitted through the liquid. Now it is usually filled with hydraulic media such as silicone oil, mineral oil, and vegetable oil. ;The working temperature of this kind of commonly used filled liquid medium is usually within 400°C, and the corresponding temperature range is relatively narrow. In the case of high temperature, the medium is easy to vaporize, and once the medium is vaporized, it is easy to damage the measuring device; also, this The thermal expansion of such liquid itself is relatively large, which has an adverse effect on the measurement accuracy. Thermal expansion is a systematic error, which is difficult to eliminate. As a result, the accuracy of the measurement device for this type of liquid medium has not been ideal, and it cannot meet high requirements and high precision. measurement needs

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