Resistivity sensor

Abstract

The invention relates to a resistivity sensor. The sensor comprises a probe and an electronic circuit, wherein the probe comprises a sealing ring, a central spindle, a left end cover, a right end cover, a first electrode retaining collar, a second electrode retaining collar, a third electrode retaining collar, a fourth electrode retaining collar and a fifth electrode retaining collar, wherein the first electrode retaining collar, the second electrode retaining collar, the third electrode retaining collar, the fourth electrode retaining collar and the fifth electrode retaining collar are sleeved on the central spindle in sequence; both ends are fixed by the left end cover and the right end cover; an insulated ring is arranged among each electrode retaining collar; the first electrode retaining collar is a guard electrode; the first electrode retaining collar and the second electrode retaining collar are in short-circuit connection; and the second electrode retaining collar, the third electrode retaining collar, the fourth electrode retaining collar and the fifth electrode retaining collar are connected with the electronic circuit. With the technical scheme, the sensor can bear 100MPa, so that the insulation environment is firm; for RFT (Radio Frequency Terminal) subsurface equipment, the sensor can normally work under high pressure of fluid liquid, is high in precision, and has a resistivity of 0.1 ohm / m, so that the salt content of water can be accurately distinguished, and output signals are high in anti-jamming capacity and stabile.

Description

technical field [0001] The invention relates to a sensor, in particular to a resistivity sensor for measuring fluid. Background technique [0002] At present, most resistivity sensors are not fully capable of bearing pressure alone, and basically rely on internal and external oil injection to maintain pressure balance. Second, it takes up a lot of space, and it is inconvenient to carry this instrument. Third, the measurement accuracy abroad is not high, and the accuracy can only roughly distinguish whether it is salt water. Contents of the invention [0003] In order to solve the above problems, the object of the present invention is to propose a fluid that can work normally under high pressure. 3. High precision, with a resolution of 0.1 Ω / m, a resistivity sensor that can accurately distinguish the salt content of water. [0004] The technical scheme of the present invention is: resistivity sensor, this sensor comprises probe and electronic circuit, [0005] The probe...

AI Technical Summary

Problems solved by technology

[0002] At present, the function of most resistivity sensors to withstand pressure alone is not perfect, and basically rely on internal and external oil injection to maintain pressure balance

Second, it takes up a lot of space and is inconvenient to load into this instrument

Third, the measurement accuracy of foreign countries is not high, and the accuracy can only roughly distinguish whether it is salt water or not.

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