CN102494841A - Pressure sensor calibration system - Google Patents

Pressure sensor calibration system Download PDF

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CN102494841A
CN102494841A CN2011104424466A CN201110442446A CN102494841A CN 102494841 A CN102494841 A CN 102494841A CN 2011104424466 A CN2011104424466 A CN 2011104424466A CN 201110442446 A CN201110442446 A CN 201110442446A CN 102494841 A CN102494841 A CN 102494841A
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pressure
pressure sensor
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data acquisition
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林敬国
万永召
房保金
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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Abstract

本发明涉及压力传感器技术领域,公开了一种压力传感器标定系统,其包括压力源、数据采集单元、数据处理单元、标准压力传感器;所述标准压力传感器、不少于一个的被测压力传感器的压力测试端均与所述压力源连通,所述标准压力传感器、所述被测压力传感器的压力信号输出端与数据采集单元的压力信号输入端连接;所述数据处理单元将所检测到的被测压力传感器的压力值与所检测到的标准压力传感器的压力值进行比较,并输出二者的差值。该压力传感器标定系统可自动采集被测压力传感器的压力值、标准压力传感器的压力值,并能自动对所采集的被测压力传感器的压力值、标准压力传感器的压力值进行比较、输出二者的差值,测量结果较为准确;这种压力传感器标定系统可同时校核多个压力传感器,工作效率较高。

Figure 201110442446

The invention relates to the technical field of pressure sensors, and discloses a pressure sensor calibration system, which includes a pressure source, a data acquisition unit, a data processing unit, and a standard pressure sensor; The pressure test terminals are all in communication with the pressure source, and the pressure signal output terminals of the standard pressure sensor and the pressure sensor under test are connected with the pressure signal input terminal of the data acquisition unit; the data processing unit connects the detected The pressure value of the measured pressure sensor is compared with the pressure value of the detected standard pressure sensor, and the difference between the two is output. The pressure sensor calibration system can automatically collect the pressure value of the pressure sensor under test and the pressure value of the standard pressure sensor, and can automatically compare the collected pressure value of the pressure sensor under test and the pressure value of the standard pressure sensor, and output both The measurement result is more accurate; this pressure sensor calibration system can check multiple pressure sensors at the same time, and the work efficiency is high.

Figure 201110442446

Description

一种压力传感器标定系统A pressure sensor calibration system

技术领域 technical field

本发明涉及压力传感器技术领域,尤其涉及一种压力传感器标定系统。The invention relates to the technical field of pressure sensors, in particular to a pressure sensor calibration system.

背景技术 Background technique

在发动机的试验中,多个性能参数需要用压力进行衡量,而压力通常采用压力传感器进行测量,压力传感器的敏感元件一般为应变片式,长期使用过程中,压力传感器的应变片会发生相应的变化,最终导致出现测量不准确现象的出现。In the engine test, multiple performance parameters need to be measured by pressure, and the pressure is usually measured by a pressure sensor. The sensitive element of the pressure sensor is generally a strain gauge type. During long-term use, the strain gauge of the pressure sensor will produce a corresponding changes, which eventually lead to inaccurate measurements.

为了防止出现因为应变片的变化导致压力传感器测量不准确的现象,在压力传感器使用一定时间后,通常将压力传感器放在压力传感器标定系统上进行标定,从而确定该压力传感器的工作状态。In order to prevent the inaccurate measurement of the pressure sensor due to the change of the strain gauge, after the pressure sensor has been used for a certain period of time, the pressure sensor is usually calibrated on the pressure sensor calibration system to determine the working status of the pressure sensor.

现有技术中,压力传感器标定系统一般包括手动压力泵、一个带有数显功能的压力表作为参比传感器,被测压力传感器的压力信号输出端接入一个二次仪表,用于显示被测压力传感器的实际压力大小。对被测传感器进行标定时,手动调整压力泵到设定值,读取参比传感器数值,再读取被测压力传感器的数值,手动记录两个数值,并计算出二者的差值。In the prior art, the pressure sensor calibration system generally includes a manual pressure pump, a pressure gauge with a digital display function as a reference sensor, and the pressure signal output end of the pressure sensor under test is connected to a secondary instrument for displaying the measured pressure. The actual pressure of the pressure sensor. When calibrating the sensor under test, manually adjust the pressure pump to the set value, read the value of the reference sensor, then read the value of the pressure sensor under test, manually record the two values, and calculate the difference between them.

这种压力传感器标定系统采用手动压力泵产生压力,所有数据读取过程均为人工读取,人工计算出结果,不能自动给出结构报告,可能存在读取、计算偏差,从而造成测量结果不准确;而且这种压力传感器标定系统一次只能校核一个压力传感器,工作效率较低。This pressure sensor calibration system uses a manual pressure pump to generate pressure. All data reading processes are manually read, and the results are calculated manually. The structure report cannot be automatically given, and there may be reading and calculation deviations, resulting in inaccurate measurement results. ; And this pressure sensor calibration system can only check one pressure sensor at a time, and the work efficiency is low.

因此,如何研发出一种测量结果准确、工作效率较高的压力传感器标定系统,成为本领域技术人员亟待解决的技术难题。Therefore, how to develop a pressure sensor calibration system with accurate measurement results and high work efficiency has become a technical problem to be solved urgently by those skilled in the art.

发明内容 Contents of the invention

本发明的目的是提供一种压力传感器标定系统,该压力传感器标定系统测量结果准确、工作效率较高。The object of the present invention is to provide a pressure sensor calibration system, which has accurate measurement results and high work efficiency.

为了实现上述目的,本发明提供了一种压力传感器标定系统,包括压力源、数据采集单元、数据处理单元、标准压力传感器;所述标准压力传感器、不少于一个的被测压力传感器的压力测试端均与所述压力源连通,所述标准压力传感器、所述被测压力传感器的压力信号输出端与数据采集单元的压力信号输入端连接;所述数据处理单元将所检测到的被测压力传感器的压力值与所检测到的标准压力传感器的压力值进行比较,并输出二者的差值。In order to achieve the above object, the present invention provides a pressure sensor calibration system, including a pressure source, a data acquisition unit, a data processing unit, a standard pressure sensor; the pressure test of the standard pressure sensor, no less than one pressure sensor under test Both terminals are connected with the pressure source, and the pressure signal output ends of the standard pressure sensor and the measured pressure sensor are connected with the pressure signal input end of the data acquisition unit; the data processing unit detects the measured pressure The pressure value of the sensor is compared with the detected pressure value of the standard pressure sensor, and the difference between the two is output.

优选的,所述压力源为与压力输入装置连通的压力管路。Preferably, the pressure source is a pressure pipeline communicated with a pressure input device.

优选的,所述压力输入装置为手动液压泵。Preferably, the pressure input device is a manual hydraulic pump.

优选的,所述压力输入装置为空压机。Preferably, the pressure input device is an air compressor.

优选的,所述压力输入装置与所述压力管路之间设有压力调节装置。Preferably, a pressure regulating device is provided between the pressure input device and the pressure pipeline.

优选的,所述压力管路的出口处设有泄压装置。Preferably, a pressure relief device is provided at the outlet of the pressure pipeline.

优选的,所述压力源为所述被测传感器的工作压力。Preferably, the pressure source is the working pressure of the sensor under test.

优选的,所述数据采集单元包括台架主控器的台架数据采集单元。Preferably, the data collection unit includes a bench data collection unit of a bench master.

本发明提供的压力传感器标定系统包括压力源、数据采集单元、数据处理单元、标准压力传感器;所述标准压力传感器、不少于一个的被测压力传感器的压力测试端均与所述压力源连通,所述标准压力传感器、所述被测压力传感器的压力信号输出端与数据采集单元的压力信号输入端连接;所述数据处理单元将所检测到的被测压力传感器的压力值与所检测到的标准压力传感器的压力值进行比较,并输出二者的差值。The pressure sensor calibration system provided by the present invention includes a pressure source, a data acquisition unit, a data processing unit, and a standard pressure sensor; the pressure test end of the standard pressure sensor and no less than one pressure sensor under test are all communicated with the pressure source , the pressure signal output ends of the standard pressure sensor and the measured pressure sensor are connected to the pressure signal input end of the data acquisition unit; the data processing unit compares the detected pressure value of the measured pressure sensor with the detected Compare the pressure value of the standard pressure sensor and output the difference between the two.

该压力传感器标定系统中,压力源可提供被测压力传感器所设计量程内的压力,标准压力传感器可选用高一等级的压力传感器;压力源设有多个通道,多个通道可分别与标准压力传感器、一个或多个被测压力传感器的压力测试端连通。In this pressure sensor calibration system, the pressure source can provide the pressure within the designed range of the pressure sensor under test, and the standard pressure sensor can use a pressure sensor with a higher level; the pressure source has multiple channels, and the multiple channels can be connected with the standard pressure The pressure test terminals of the sensor and one or more pressure sensors under test are connected.

对被测压力传感器进行校核时,压力源提供一定的压力,当压力作用在标准压力传感器和被测压力传感器后,标准压力传感器、被测压力传感器同步给出压力信号,数据采集单元接收上述压力信号后,可分别得到标准压力传感器和被测压力传感器的压力值,数据处理单元对所检测标准压力传感器的压力值和被测压力传感器的压力值进行比较,计算出二者的差值,并输出该差值。When calibrating the pressure sensor under test, the pressure source provides a certain pressure. When the pressure acts on the standard pressure sensor and the pressure sensor under test, the standard pressure sensor and the pressure sensor under test simultaneously give pressure signals, and the data acquisition unit receives the above After the pressure signal, the pressure values of the standard pressure sensor and the measured pressure sensor can be obtained respectively, and the data processing unit compares the pressure value of the detected standard pressure sensor with the pressure value of the measured pressure sensor, and calculates the difference between the two. and output the difference.

与现有技术相比,该压力传感器标定系统可自动采集被测压力传感器的压力值、标准压力传感器的压力值,并能自动对所采集的被测压力传感器的压力值、标准压力传感器的压力值进行比较、输出二者的差值,无需人工读取被测压力传感器的压力值、标准压力传感器的压力值,数据读取及计算不易出现偏差,测量结果较为准确;这种压力传感器标定系统可同时校核多个压力传感器,工作效率较高。Compared with the existing technology, the pressure sensor calibration system can automatically collect the pressure value of the pressure sensor under test and the pressure value of the standard pressure sensor, and can automatically adjust the pressure value of the collected pressure sensor under test and the pressure value of the standard pressure sensor. Values are compared and the difference between the two is output. There is no need to manually read the pressure value of the measured pressure sensor and the pressure value of the standard pressure sensor. Data reading and calculation are not prone to deviations, and the measurement results are more accurate; this pressure sensor calibration system Multiple pressure sensors can be checked at the same time, and the work efficiency is high.

附图说明 Description of drawings

图1为本发明一种具体实施方式所提供的压力传感器标定系统的原理示意图;Fig. 1 is a schematic diagram of the principle of a pressure sensor calibration system provided by a specific embodiment of the present invention;

图2为本发明另一种具体实施方式所提供的压力传感器标定系统的原理示意图;Fig. 2 is a schematic diagram of the principle of a pressure sensor calibration system provided by another specific embodiment of the present invention;

其中,图1-图2中:Among them, in Figure 1-Figure 2:

标准压力传感器1、被测压力传感器2、数据采集单元3、数据处理单元4、压力管路5、压力调节阀6、入口阀针7、出口阀针8、台架数据采集单元9、台架主控器10。Standard pressure sensor 1, measured pressure sensor 2, data acquisition unit 3, data processing unit 4, pressure pipeline 5, pressure regulating valve 6, inlet valve needle 7, outlet valve needle 8, bench data acquisition unit 9, bench main controller 10 .

具体实施方式 Detailed ways

为了使本领域的技术人员更好的理解本发明的技术方案,下面结合附图和具体实施方式对本发明作进一步的详细说明。In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

请参看图1,图1为本发明一种具体实施方式所提供的压力传感器标定系统的原理示意图。Please refer to FIG. 1 . FIG. 1 is a schematic diagram of the principle of a pressure sensor calibration system provided by a specific embodiment of the present invention.

如图1所示,本发明提供的压力传感器标定系统包括压力源、数据采集单元3、数据处理单元4、标准压力传感器1;所述标准压力传感器1、不少于一个的被测压力传感器2的压力测试端均与所述压力源连通,所述标准压力传感器1、所述被测压力传感器2的压力信号输出端与数据采集单元3的压力信号输入端连接;所述数据处理单元4将所检测到的被测压力传感器2的压力值与所检测到的标准压力传感器1的压力值进行比较,并输出二者的差值。As shown in Figure 1, the pressure sensor calibration system provided by the present invention includes a pressure source, a data acquisition unit 3, a data processing unit 4, a standard pressure sensor 1; the standard pressure sensor 1, no less than one measured pressure sensor 2 The pressure test ends of each are connected with the pressure source, and the pressure signal output ends of the standard pressure sensor 1 and the measured pressure sensor 2 are connected with the pressure signal input end of the data acquisition unit 3; the data processing unit 4 will The detected pressure value of the tested pressure sensor 2 is compared with the detected pressure value of the standard pressure sensor 1, and the difference between the two is output.

该压力传感器标定系统中,压力源可提供被测压力传感器2所设计量程内的压力,标准压力传感器1可选用高一等级的压力传感器,具体的方案中,数据采集单元3可采用数据采集卡;压力源设有多个通道,多个通道可分别与标准压力传感器1、一个或多个被测压力传感器2的压力测试端连通。In this pressure sensor calibration system, the pressure source can provide the pressure within the designed range of the measured pressure sensor 2, and the standard pressure sensor 1 can use a pressure sensor of a higher grade. In a specific solution, the data acquisition unit 3 can use a data acquisition card ; The pressure source is provided with a plurality of channels, and the plurality of channels can communicate with the pressure test end of the standard pressure sensor 1 and one or more pressure sensors 2 under test respectively.

对被测压力传感器2进行校核时,压力源提供一定的压力,当压力作用在标准压力传感器1和被测压力传感器2后,标准压力传感器1、被测压力传感器2同步给出压力信号,数据采集单元3接收上述压力信号后,可分别得到标准压力传感器1和被测压力传感器2的压力值,数据处理单元4对所检测标准压力传感器1的压力值和被测压力传感器2的压力值进行比较,计算出二者的差值,并输出该差值。When checking the pressure sensor 2 under test, the pressure source provides a certain pressure. When the pressure acts on the standard pressure sensor 1 and the pressure sensor 2 under test, the standard pressure sensor 1 and the pressure sensor under test 2 give out pressure signals synchronously. After the data acquisition unit 3 receives the above-mentioned pressure signal, the pressure values of the standard pressure sensor 1 and the pressure sensor 2 under test can be obtained respectively, and the data processing unit 4 compares the pressure value of the detected standard pressure sensor 1 and the pressure value of the pressure sensor 2 under test Compare, calculate the difference between the two, and output the difference.

与现有技术相比,该压力传感器标定系统可自动采集被测压力传感器2的压力值、标准压力传感器1的压力值,并能自动对所采集的被测压力传感器2的压力值、标准压力传感器1的压力值进行比较、输出二者的差值,无需人工读取被测压力传感器2的压力值、标准压力传感器1的压力值,数据读取及计算不易出现偏差,测量结果较为准确;这种压力传感器标定系统可同时校核多个压力传感器,工作效率较高。Compared with the prior art, the pressure sensor calibration system can automatically collect the pressure value of the pressure sensor 2 under test and the pressure value of the standard pressure sensor 1, and can automatically calculate the collected pressure value of the pressure sensor 2 under test and the standard pressure The pressure value of sensor 1 is compared and the difference between the two is output, without manual reading of the pressure value of the measured pressure sensor 2 and the pressure value of the standard pressure sensor 1, the data reading and calculation are not prone to deviation, and the measurement results are more accurate; The pressure sensor calibration system can simultaneously calibrate a plurality of pressure sensors, and has high working efficiency.

具体的实施方式中,压力源可以为与压力输入装置连通的压力管路5,更具体的方案中,压力管路5上可设有八个通道,其中一个通道与标准压力传感器1的压力测试端连通,其余七个通道可分别与七个被测压力传感器2的压力测试端连通,七个被测压力传感器2的压力信号输出端与数据采集单元3的压力信号接收端连接。In a specific embodiment, the pressure source can be a pressure pipeline 5 communicated with a pressure input device. In a more specific solution, the pressure pipeline 5 can be provided with eight channels, one of which is connected to the pressure test of the standard pressure sensor 1 The other seven channels can be respectively connected with the pressure test terminals of the seven tested pressure sensors 2, and the pressure signal output terminals of the seven tested pressure sensors 2 are connected with the pressure signal receiving terminal of the data acquisition unit 3.

具体的方案中,压力输入装置可采用手动液压泵,手动液压泵用于向实施压力管路5提供被测压力传感器2所设计量程内的压力,优选的方案中,为了便于控制进入压力管路5内的压力的大小,可所述手动液压泵与所述压力管路5之间设有压力调节装置,具体的方案中,压力调节装置可包括压力调节阀6、入口阀针7,通过压力调节阀6、入口阀针7可调节手动泵输入的进入压力管路5内的液体介质;进一步的方案中,为了调节压力管路5内的压力的大小,可在所述压力管路5的出口处设有泄压装置,泄压装置具体可以为出口阀针8。In a specific scheme, the pressure input device can adopt a manual hydraulic pump, which is used to provide the pressure pipeline 5 with the pressure within the designed range of the pressure sensor 2 under test. In the preferred scheme, in order to facilitate the control of the pressure pipeline 5, a pressure regulating device may be provided between the manual hydraulic pump and the pressure pipeline 5. In a specific scheme, the pressure regulating device may include a pressure regulating valve 6 and an inlet valve needle 7. The regulating valve 6 and the inlet valve needle 7 can adjust the liquid medium entering the pressure pipeline 5 input by the manual pump; in a further scheme, in order to adjust the pressure in the pressure pipeline 5, the A pressure relief device is provided at the outlet, and the pressure relief device may specifically be an outlet valve needle 8 .

对被测压力传感器2进行校核时,手动液压泵可提供具有一定压力的液体介质,可通过压力调节阀6将液体介质的压力调整到合适的压力值(该压力值可根据被校核的压力传感器的量程而定),打开入口阀针7,此时出口阀针8关闭,当各被测压力传感器2的读数稳定后,数据采集单元3读数,依次调整压力调节阀6到多个不同的压力值;当校核从高压力值到低压力值时,首先把压力调节阀6内的压力调整到需要的最高压力点,关闭入口阀针7,逐渐打开出口阀针8,让压力管路5的内部压力逐步释放,当压力降低到某一值时,关闭出口阀针8,待被测压力传感器2读数稳定后,数据采集单元3读数,依次调整多个压力值点;数据采集单元3记录完毕后,数据处理单元4把被检测压力传感器的压力值与标准压力传感器1的压力值进行比较,得出二者的差值,并输出该差值给出报告。When checking the pressure sensor 2 to be tested, the manual hydraulic pump can provide a liquid medium with a certain pressure, and the pressure of the liquid medium can be adjusted to an appropriate pressure value through the pressure regulating valve 6 (the pressure value can be adjusted according to the checked pressure value). Depending on the range of the pressure sensor), the inlet valve needle 7 is opened, and the outlet valve needle 8 is closed at this time. When the readings of each pressure sensor 2 to be measured are stable, the data acquisition unit 3 reads, and the pressure regulating valve 6 is sequentially adjusted to a number of different pressure sensors. When checking from high pressure value to low pressure value, first adjust the pressure in the pressure regulating valve 6 to the required highest pressure point, close the inlet valve needle 7, and gradually open the outlet valve needle 8, so that the pressure pipe The internal pressure of the road 5 is gradually released. When the pressure drops to a certain value, the outlet valve needle 8 is closed. After the reading of the pressure sensor 2 under test is stable, the data acquisition unit 3 reads and adjusts multiple pressure value points in turn; the data acquisition unit 3 After the recording is completed, the data processing unit 4 compares the pressure value of the detected pressure sensor with the pressure value of the standard pressure sensor 1, obtains the difference between the two, and outputs the difference to give a report.

上述实施例中,压力输入装置采用手动液压泵,压力介质为液体介质,本发明并不局限于此,压力输入装置还可以采用空压机,压力介质可采用气体,这两种方案均应在本发明的保护范围内。In the above embodiments, the pressure input device adopts a manual hydraulic pump, and the pressure medium is a liquid medium. The present invention is not limited thereto. The pressure input device can also use an air compressor, and the pressure medium can be gas. within the protection scope of the present invention.

上述实施例中,用于校核被测压力传感器2的压力来自独立设置的压力源,本发明并不局限于此,用于校核被测压力传感器2的压力可以为被测压力传感器2的工作压力,以下对这种实施方式进行简单介绍。In the above-described embodiment, the pressure used to check the pressure sensor 2 under test comes from an independently set pressure source, the present invention is not limited thereto, the pressure used to check the pressure sensor 2 under test can be the Working pressure, the following is a brief introduction to this embodiment.

请参看图2,图2为本发明另一种具体实施方式所提供的压力传感器标定系统的原理示意图。Please refer to FIG. 2 . FIG. 2 is a schematic diagram of the principle of a pressure sensor calibration system provided by another specific embodiment of the present invention.

如图2所示,发动机的测试台架上的被测压力传感器2可直接安装到压力源上,被测压力传感器2、标准压力传感器1的压力测试端均与压力源连通,优选方案中,被测压力传感器2的压力信号可由发动机的台架主控器10的台架数据采集单元9进行采集,数据处理单元4将所述台架数据采集单元9采集到的被测压力传感器2的压力值与数据采集单元3采集到的标准压力传感器1的压力值进行比较,计算二者的差值,并输出该差值。As shown in Figure 2, the measured pressure sensor 2 on the test bench of the engine can be directly installed on the pressure source, and the pressure test ends of the measured pressure sensor 2 and the standard pressure sensor 1 are all communicated with the pressure source. In the preferred scheme, The pressure signal of the measured pressure sensor 2 can be collected by the bench data acquisition unit 9 of the bench master controller 10 of the engine, and the data processing unit 4 collects the pressure signal of the tested pressure sensor 2 collected by the bench data acquisition unit 9. The pressure value is compared with the pressure value of the standard pressure sensor 1 collected by the data collection unit 3, the difference between the two is calculated, and the difference is output.

这种方案,被测压力传感器2的数据采集仍然在发动机的台架上正常采集数据,可以实现台架不用拆装,不需改变数据采集的方式,实现了台架上压力传感器和数据采集通道的同步校核,方法简单。易于实现,便于实现现场操作。In this solution, the data collection of the pressure sensor 2 under test is still collected normally on the engine bench, which can realize the bench without disassembly and change of the data collection method, and realize the pressure sensor and data collection channel on the bench The synchronous checking method is simple. Easy to realize, convenient to realize on-site operation.

以上所述仅是发明的优选实施方式的描述,应当指出,由于文字表达的有限性,而在客观上存在无限的具体结构,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。The above is only a description of the preferred embodiment of the invention. It should be pointed out that due to the limitation of literal expression, there are objectively unlimited specific structures. Under the premise of the invention, some improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (8)

1. a pressure sensor calibrating system is characterized in that, comprises pressure source, data acquisition unit, data processing unit, standard pressure transducer; Said standard pressure transducer, be no less than one tested pressure transducer the pressure test end all with said pressure-source communication, the pressure signal output terminal of said standard pressure transducer, said tested pressure transducer is connected with the pressure signal input end of data acquisition unit; Said data processing unit compares the force value of detected tested pressure transducer and the force value of detected standard pressure transducer, and exports the difference of the two.
2. pressure sensor calibrating according to claim 1 system is characterized in that said pressure source is the pressure piping that is communicated with pressure input device.
3. pressure sensor calibrating according to claim 2 system is characterized in that said pressure input device is a hydraulic hand-pump.
4. pressure sensor calibrating according to claim 2 system is characterized in that said pressure input device is an air compressor machine.
5. according to each described pressure sensor calibrating system of claim 2-4, it is characterized in that, be provided with pressure adjustment assembly between said pressure input device and the said pressure piping.
6. pressure sensor calibrating according to claim 5 system is characterized in that the exit of said pressure piping is provided with pressure relief device.
7. pressure sensor calibrating according to claim 1 system is characterized in that said pressure source is the working pressure of said tested sensor.
8. pressure sensor calibrating according to claim 7 system is characterized in that said data acquisition unit comprises the stand data acquisition unit of stand primary controller.
CN2011104424466A 2011-12-26 2011-12-26 Pressure sensor calibration system Pending CN102494841A (en)

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Application publication date: 20120613