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Automatic zero correction method for bio-safety cabinet wind speed sensing device

A wind speed sensor and sensor technology, applied in the testing/calibration of speed/acceleration/shock measuring equipment, instruments, speed/acceleration/shock measurement, etc., to achieve the effect of preventing unnecessary danger

Active Publication Date: 2007-09-12
上海力申科学仪器有限公司
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AI Technical Summary

Problems solved by technology

[0006] Nowadays, many biological safety cabinets directly use the wind speed sensor to measure the speed, but the stability of the sensor has not been dealt with accordingly.

Method used

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  • Automatic zero correction method for bio-safety cabinet wind speed sensing device

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Experimental program
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Embodiment

[0020] As shown in FIG. 1 , it is a program flow chart of an automatic zero point calibration method for a wind speed sensor of a biological safety cabinet.

[0021] For the convenience of description, the following nouns are introduced first:

[0022] Sensor reference curve: the collection point curve calibrated by the sensor during initial use

[0023] Sensor drift curve: the collection point curve of the sensor when it drifts

[0024] Sensor calibration curve: the corrected sensor collection point curve (should be a curve that coincides with the reference curve)

[0025] Calibration curve correction value: the difference between the zero point value of the reference curve of the sensor and the zero point value of the drift curve of the sensor.

[0026] Zero wind speed value: its value is 0, after starting up, the wind speed value when the fan is not turned on.

[0027] High point wind speed value: the wind speed value of the set point to ensure the user can use it safely...

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Abstract

This invention relates to a kind of automatic zeropoint calibration way of wind speed sensor of biosafety tank. Each wind speed sensor will first takes standardization to normal state before using. Zero initial value and high spot initial value of standardization will be saved as reference zero baseline value and reference high spot baseline value, and used for figuring out reference curve. While every time using of latter day, first unclose blower fan, but blower fan not start-up. first sensor warm-up, keeping wind speed around sensor as 0, stabilizing for 15 seconds to 5 minutes, picking currently wind speed sensor zero value, and comparing currently wind speed sensor sampling value with reference zero baseline value, if occurring drift, then figure out correction curve corrected value. According to corrected value of correction curve to amend sampling value of currently wind speed sensor, figure out correction curve, amend drift of sensor. The merit is preventing unnecessary hazard caused by sensor drift.

Description

technical field [0001] The invention relates to an automatic zero-point correction method of an air velocity sensor of a biological safety cabinet, in particular to a method capable of performing correction when the wind velocity sensor deviates, and belongs to the technical field of safety cabinet control. Background technique [0002] The biological safety cabinet is an air purification device that provides a dust-free and sterile working environment to protect personnel safety, product safety and external environment safety, and can artificially control the emission of polluted air in the work area through a special filter channel. To the outdoors, avoiding harm to people and the environment. It is a safe special clean bench for microorganisms. It can be used in biological laboratories, medical and health, biopharmaceutical and other related industries. It is good for improving process conditions and protecting the health of operators. Have good effect. [0003] Its hori...

Claims

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Application Information

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IPC IPC(8): G01P21/02
Inventor 吴峻罗鹏冯金栋
Owner 上海力申科学仪器有限公司
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