Detection method and dedicated equipment for pressure difference measuring device

A technology of measuring device and special equipment, applied in the direction of measuring device, test/calibration device, measuring fluid pressure, etc. Sexuality and intelligence, cleverly conceived effects

Inactive Publication Date: 2007-03-14
李丹佳
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  • Claims
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Problems solved by technology

The problems existing in the above-mentioned verification method and equipment are: ①Using a high static pressure differential pressure piston gauge to complete the point-by-point verification of the differential pressure transmitter, because the differential pressure is given by weights, continuous verification cannot be achieved, Large limitations; ②Although the high static pressure differential pressure piston gauge eliminates the influence of static pressure to a certain extent, due to design limitations, the upper limit of static pressure measurement cannot exceed 6MPa at present, and the method of adding or subtracting weights is used It is also difficult to realize the continuity and intelligence of the measurement by changing the pressure

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  • Detection method and dedicated equipment for pressure difference measuring device

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific application examples.

[0021] This embodiment is to test the differential pressure switch.

[0022] The verification equipment of the differential pressure measurement device consists of a pressure making device, a high pressure chamber 2, a low pressure chamber 3 and a differential pressure fine-tuning device, a pressure sensor, a temperature sensor, computer equipment, a bracket, a box, etc. The pressure making device includes a pressure making pump 12 and the liquid storage tank 8, one end of the pressure making pump 12 communicates with the liquid storage tank 8, and the other end communicates with the high-pressure chamber 2, and an isolation valve 11 is arranged in the connecting pipeline; the high-pressure chamber 2 connects with the low-pressure chamber 3 through the pipeline The connecting pipeline is provided with a balance valve 9; the h...

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Abstract

The related verification method for pressure-difference measurement device comprises: 1) given static pressure P and pressure difference deltaP, calculating the strain volume deltaV and the travel deltaH of fine-tuning pitons (5, 6) connected between high and low pressure room (2, 3); 2) controlling pitons movement by deltaH to change gas volume in (2, 3) and produce real pressure difference deltaP' determined by real deltaH'; 3) when deltaH = deltaH' and deltaP = deltaP', acting the measurement device (1) to complete one-time verification. This invention satisfies JJG882-2004 standard, fit to any P and deltaP, and needs no special requirement for environment.

Description

Technical field: [0001] The invention relates to a measurement verification method and special equipment, in particular to a verification method and special equipment for a differential pressure measuring device (including a differential pressure transmitter and a differential pressure switch). Background technique: [0002] Differential pressure measurement devices mainly include differential pressure transmitters and differential pressure switches, which can accurately measure liquid level and flow, and are widely used in petroleum, chemical, textile, electric power, food, papermaking, pharmaceutical and other industrial fields; especially in flow The method of measuring differential pressure with a throttling device in the measurement system is one of the main means of flow measurement. The verification of the differential pressure measuring device should follow the "National Metrology Verification Regulations of the People's Republic of China JJG882-2004 "Pressure Transm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L27/00G01F25/00
Inventor 李丹佳
Owner 李丹佳
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