WO2012163191A1 - 一种变送器故障诊断电路及方法 - Google Patents

一种变送器故障诊断电路及方法 Download PDF

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Publication number
WO2012163191A1
WO2012163191A1 PCT/CN2012/074296 CN2012074296W WO2012163191A1 WO 2012163191 A1 WO2012163191 A1 WO 2012163191A1 CN 2012074296 W CN2012074296 W CN 2012074296W WO 2012163191 A1 WO2012163191 A1 WO 2012163191A1
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Prior art keywords
signal
processing module
sensor
signal processing
switch
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PCT/CN2012/074296
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English (en)
French (fr)
Inventor
周翔
王汉其
袁庆国
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Hunan Sany Intelligent Control Equipment Co Ltd
Sany Heavy Industry Co Ltd
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Hunan Sany Intelligent Control Equipment Co Ltd
Sany Heavy Industry Co Ltd
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Publication of WO2012163191A1 publication Critical patent/WO2012163191A1/zh
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L27/00Testing or calibrating of apparatus for measuring fluid pressure
    • G01L27/007Malfunction diagnosis, i.e. diagnosing a sensor defect
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/10Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for switching-in of additional or auxiliary indicators or recorders

Definitions

  • the invention relates to a transmitter fault diagnosis circuit.
  • the invention also relates to a transmitter fault diagnosis method.
  • Pressure sensors are currently the most widely used sensors, widely used in petroleum, chemical, etc.
  • the industrial field and the defense fields such as aviation and aerospace.
  • pressure transmitters are used more and more.
  • the pressure transmitter will be damaged or malfunction due to various environmental factors, resulting in no output or abnormal signal.
  • the pressure transmitter is broken. It is difficult to determine the specific damage.
  • the damaged part may be the sensor core or the transmitter processing module. It is difficult to quickly locate the fault. Many manufacturers are now dealing with the fault.
  • the transmitter is used to remove the pressure transmitter, it is tested according to the conventional method, which is troublesome to check and repair, and it takes time and labor.
  • the present invention provides a transmitter fault diagnostic circuit.
  • the present invention also provides a transmitter fault diagnosis method.
  • the invention provides a transmitter fault diagnosis circuit, which comprises:
  • a sensor for detecting a physical quantity and forming a detection signal
  • a signal processing module configured to receive a detection signal of the sensor and process the output
  • a standard signal input module configured to provide a standard signal to the signal processing module
  • a switch, the switch, and the sensor and signal processing The module is connected, and is also connected to the standard signal input module and the signal processing module;
  • the module is connected to the standard signal input module and the signal processing module at the same time.
  • the senor comprises a pressure sensor, a temperature sensor, a level sensor, or a flow sensor.
  • the pressure sensor is a differential pressure sensor
  • the switch is a double-pole double-throw switch.
  • the two end pins of the differential pressure sensor are respectively connected to the non-inverting input end and the inverting input end of the signal processing module, and the other two end pins are respectively connected to the double-pole double-throw switch
  • two end pins of the standard signal input module are respectively connected to the other side of the double-pole double-throw switch, and two switch cutters of the double-pole double-throw switch are respectively connected to the signal processing.
  • the double-pole double-throw switch is a switch controlled by an external signal or a manually switched switch.
  • the switch is a single-pole double-throw switch
  • one end of the pressure sensor is connected to the signal processing module
  • the other end is connected to one side of the single-pole double-throw switch
  • the standard signal One end of the input module is connected to the other side of the single-pole double-throw switch
  • the switch of the single-pole double-throw switch is connected to the signal processing module.
  • the standard signal is a signal value selected from a range in which the sensor outputs a detection signal in a non-fault state.
  • the invention provides a transmitter fault diagnosis method, which comprises the following steps:
  • Step a When the transmitter fails, cut off the signal transmission between the internal sensor of the transmitter and the signal processing module;
  • Step b input a standard signal to the signal processing module separately;
  • Step c Determine whether the signal output by the signal processing module after processing the standard signal is normal. If the signal is normal, the sensor has a fault. If not, the signal processing module has a fault.
  • the standard signal is a signal value selected from a range in which the sensor outputs a detection signal in a non-fault state.
  • the beneficial effects brought by the transmitter fault diagnosis circuit are as follows: (1)
  • the invention adds a standard signal input module to the original transmitter circuit for inputting a standard signal to the signal processing module.
  • the standard signal is output from the sensor without fault, during normal operation. A value selected from the range of detection signals.
  • the switch is set, and the switch is connected to the signal processing module through the switch, or the standard signal input unit is connected to the signal processing module.
  • the switch disconnects the sensor from the signal processing module, and connects to the standard signal input module and the signal processing module.
  • the standard signal input module inputs a standard signal to the signal processing module, and the signal processing module is based on the normal standard signal.
  • the processing After the processing is output, if the output result is also normal, it can be judged that the fault is not in the signal processing module, but in the sensor. Otherwise, the fault is in the signal processing module.
  • a standard signal input module a reference signal of a standard signal is provided, and the switch is switched by the switch, and the structure and the fault are clearly and conveniently determined.
  • the principle of constructing the cylinder, low cost and easy maintenance can be realized by improving the existing transmitter. And the small space is occupied, which is beneficial to the miniaturization of the transmitter.
  • the switch adopts the switch controlled by the external control signal, which is convenient to control.
  • the whole transmitter can be sealed, which is not easy to fall ash and prolong the service life of the transmitter.
  • the beneficial effects of the transmitter fault diagnosis method provided by the invention are as follows: When the transmitter fails, the connection between the existing sensor and the signal processing module of the transmitter is disconnected, and the signal is separately directed.
  • the processing module inputs a standard signal value, and the standard signal value is a fixed value selected from a range of detection signals output when the sensor is in normal operation and when there is no fault.
  • the signal processing module inputs the structure according to the labeled signal, the structure may be abnormal. The judgment is that the signal processing module has a fault. If the result is normal, it can be judged that the sensor has a fault.
  • the detection method is single, fast, easy to implement, and the detection result is reliable.
  • FIG. 1 is a circuit diagram of a fault diagnosis circuit provided by the present invention.
  • FIG. 3 is a flow chart showing a fault diagnosis method provided by the present invention.
  • the present invention provides a transmitter fault diagnosis circuit, including:
  • the sensor 11 is configured to detect a physical quantity and form a detection signal; the detected physical quantity may be parameter information such as temperature, pressure, liquid level, and flow rate.
  • the signal processing module 12 is configured to receive the detection signal of the sensor and perform processing and output; the signal processing module 12 processes the detection signal mainly by amplifying and outputting the detection signal.
  • a standard signal input module 13 is operative to provide a standard signal to the signal processing module 12.
  • the standard signal is a signal value selected from a range in which the sensor 11 outputs a detection signal in a no-fault state. This signal value is used as a standard signal to reflect the detection signal output when the sensor is in normal operation and there is no fault.
  • the switch 14 is connected to the sensor 11 and the signal processing module 12, and is also connected to the standard signal input module 13 and the signal processing module 12;
  • the switch 14 is connected to the sensor 11 and the signal processing module 12 while disconnecting the standard signal input module 13 and the signal processing module 12; or the switch 14 is disconnected from the sensor 11 and the signal processing module 12
  • the standard signal input module 13 and the signal processing module 12 are connected at the same time.
  • the sensor 11 includes a pressure sensor, a temperature sensor, a level sensor, or a flow sensor.
  • the sensor 11 is a pressure sensor
  • the pressure sensor is a differential pressure sensor
  • the switch 14 is a double-pole double-throw switch.
  • the two end pins of the differential pressure sensor are respectively connected to the positive phase input terminal IN+ and the inverting input terminal IN- of the signal processing module 12, and the other two end pins respectively access the A1 leg and A2 pin on one side of the double-pole double-throw switch, the two end pins of the standard signal input module 13 are respectively connected to the B1 foot and the B2 foot on the other side of the double-pole double-throw switch.
  • the two switching knives C of the double-pole double-throw switch are respectively connected to the first transmission signal input terminal IP1 and the second transmission signal input terminal IP2 of the signal processing module.
  • the circuit diagram shown in 1 shows that depending on the type of sensor, such as differential, single-signal, etc., the output can be a single signal or multiple signals, and the corresponding switch A1 to An, B1 to Bn do the corresponding The number of changes, the first transmission signal input terminal IP1 to the nth transmission signal input terminal IPn of the input signal processing module also change correspondingly.
  • the embodiment sensor shown in Figure 2 employs a differential pressure sensor.
  • the double-pole double-throw switch is a switch controlled by an external signal, and the external control signal is connected to the double-pole double-throw switch to control the switching.
  • a manually switched switch can also be used to perform manual switching.
  • the fault detecting circuit of the present invention first operates the switching switch 14 to switch the circuit, connects the signal processing module 12 with the standard signal input module 13, and disconnects the sensor 11 and the signal processing module 12.
  • the standard signal input module 13 inputs a standard signal to the signal processing module 12, which is a value selected from the range of the detection signal output during normal operation from the sensor 11 in a non-fault state.
  • the signal processing module 12 performs amplification processing according to a normal standard signal, and if the output result is also normal, it can be determined that the fault is not in the signal processing module 12 but in the sensor 11. Otherwise, the fault is at the signal processing module 12.
  • a standard signal input module 13 a reference signal of a standard signal is provided, and the switch 14 is switched, and the structure is simple and the fault is judged clearly and conveniently.
  • the principle of constructing the cylinder, low cost and easy maintenance can be realized by improving the existing transmitter. And the small space is occupied, which is beneficial to the miniaturization of the transmitter.
  • the pressure sensor is a single-signal sensor.
  • the switch is a single-pole double-throw switch, and one end of the pressure sensor is connected.
  • the other end is connected to one side of the single-pole double-throw switch, and one end of the standard signal input module is connected to the other side of the single-pole double-throw switch, the single-pole A switching knife of the double throw switch is connected to the signal processing module.
  • the present invention also provides a transmitter fault diagnosis method, as shown in FIG. 3, including the following steps:
  • Step a When the transmitter fails, the signal between the transmitter's internal sensor and the signal processing module is cut off.
  • Step b Enter a standard signal separately to the signal processing module.
  • the standard signal is a signal value selected from a range in which the sensor outputs a detection signal in a non-faulty state.
  • Step c Determine whether the signal output by the signal processing module after processing the standard signal is normal. If the signal is normal, the sensor has a fault. If not, the signal processing module has a fault.
  • the transmitter fails, disconnect the existing sensor and signal processing module of the transmitter, and separately input a standard signal value to the signal processing module.
  • the standard signal value is normal when the sensor is working.
  • the signal processing module may be judged to be faulty. If the result is normal, it may be determined that the sensor is present. malfunction. Detecting party
  • the method is simple, fast, easy to implement, and the test results are reliable.
  • the method includes the steps of the foregoing method embodiment, such as: a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM). Wait.
  • the sequence numbers of the steps are not used to limit the sequence of the steps.
  • the steps of the steps are performed without any creative labor. Variations are also within the scope of the invention.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

一种变送器故障诊断电路,包括:传感器(11),用于检测物理量并形成检测信号;信号处理模块(12),用于接收传感器(11)的检测信号并进行处理后输出;标准信号输入模块(13),用于向信号处理模块(12)提供标准信号;切换开关(14),与传感器(11)和信号处理模块(12)连接,同时还与标准信号输入模块(13)和信号处理模块(12)连接;切换开关(14)连接传感器(11)和信号处理模块(12)的同时断开标准信号输入模块(13)和信号处理模块(12);或切换开关(14)断开传感器(11)和信号处理模块(12)的同时连接标准信号输入模块(13)和信号处理模块(12)。一种变送器故障诊断方法,包括如下步骤:当变送器出现故障时,切断变送器内部传感器与信号处理模块的连接,单独向信号处理模块输入标准信号,根据标准信号进行处理后输出,若输出结果正常则传感器存在故障,若不正常则信号处理模块存在故障。

Description

一种变送器故障诊断电路及方法
本申请要求于 2011 年 05 月 30 日提交中国专利局、 申请号为 201110142962.7、 发明名称为"一种变送器故障诊断电路及方法"的中国专 利申请的优先权, 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及一种变送器故障诊断电路, 另外, 本发明还涉及一种变送 器故障诊断方法。
背景技术
传感器在科学研究和技术开发中, 特别是在信息技术, 自动化技术, 现代制造等技术中, 起着不可替代的作用, 压力传感器是目前应用数量最 多的一种传感器, 广泛应用于石油、 化工等工业领域以及航空、 航天等国 防领域。
现在压力变送器应用越来越多, 在实际工作中, 压力变送器由于受到 各种环境因素的影响, 就会发生损坏或者故障, 导致无输出或者信号不正 常。 一般情况下, 压力变送器坏了 4艮难确定具体损坏的部分, 损坏的部位 有可能是传感器芯体或者变送器处理模块, 难以快速定位故障所在, 现在 很多厂家在处理发生故障的压力变送器的时候习惯将压力变送器拆掉, 按 照常规的方法检测, 这样检查和维修比较麻烦, 且耗费时间和人力。
发明内容
为了克服现有技术的上述缺陷和不足, 本发明提供一种变送器故障诊 断电路。
另外, 本发明还提供一种变送器故障诊断方法。
本发明提供的一种变送器故障诊断电路, 包括:
传感器, 用于检测物理量并形成检测信号;
信号处理模块, 用于接收所述传感器的检测信号并进行处理后输出; 标准信号输入模块, 用于向所述信号处理模块提供标准信号; 切换开关, 所述切换开关与所述传感器和信号处理模块连接, 同时还 与所述标准信号输入模块和信号处理模块连接;
所述切换开关连接所述传感器和信号处理模块的同时断开所述标准信 号输入模块和信号处理模块; 或所述切换开关断开所述传感器和信号处理 模块的同时连接所述标准信号输入模块和信号处理模块。
优选的, 所述传感器包括压力传感器、 温度传感器、 液位传感器、 或 流量传感器。
优选的, 所述压力传感器为差分式压力传感器, 所述切换开关为双刀 双掷切换开关。
优选的, 所述差分式压力传感器的两个端脚分别接入所述信号处理模 块的正相输入端和反相输入端, 另外两个端脚分别接入所述双刀双掷切换 开关的一侧, 所述标准信号输入模块的两个端脚分别接入所述双刀双掷切 换开关的另一侧, 所述双刀双掷切换开关的两个切换刀分别接入所述信号 处理模块的第一变送信号输入端和第二变送信号输入端。
优选的, 所述双刀双掷切换开关为由外部信号控制的切换开关、 或手 动切换的切换开关。
优选的, 所述切换开关为单刀双掷切换开关, 所述压力传感器的一个 端脚接入所述信号处理模块,另一端脚接入所述单刀双掷切换开关的一侧, 所述标准信号输入模块的一个端脚接入所述单刀双掷切换开关的另一侧, 所述单刀双掷切换开关的切换刀接入所述信号处理模块。
优选的, 所述标准信号为从无故障状态下传感器输出检测信号的范围 中选取的一个信号值。
本发明提供的一种变送器故障诊断方法, 包括如下步骤:
步骤 a: 当变送器出现故障时, 切断变送器内部传感器与信号处理模 块之间的信号传递;
步骤 b: 单独向信号处理模块输入一个标准信号;
步骤 c: 判断所述信号处理模块对所述标准信号进行处理后输出的信 号是否正常, 若正常则传感器存在故障, 若不正常则信号处理模块存在故 障。
优选的, 所述标准信号为从无故障状态下传感器输出检测信号的范围 中选取的一个信号值。
采用本发明提供的一种变送器故障诊断电路带来的有益效果为: ( 1 ) 本发明在原有变送器电路中加入标准信号输入模块, 用于向信号处理模块 输入一个标准的信号, 该标准信号从传感器无故障状态下, 正常工作时输 出的检测信号的范围中选却的一个值。 同时设置切换开关, 通过切换开关 来切换传感器与信号处理模块连接、 或标准信号输入单元与信号处理模块 连接。 当出现故障时, 切换开关切断传感器与信号处理模块的连接, 改为 连接标准信号输入模块与信号处理模块, 由标准信号输入模块向信号处理 模块输入一个标准信号, 信号处理模块根据正常的标准信号进行处理后输 出, 如输出结果也正常, 则可判断故障不在信号处理模块, 而在传感器。 反之, 则故障在信号处理模块。 通过设置一个标准信号输入模块, 提供一 个标准信号的基准参考信号, 通过切换开关进行切换, 结构筒单、 故障判 断清楚、 方便。 原理构造筒单、 成本低、 便于维护, 可在现有变送器基础 上改进即可实现。 且占用空间小, 利于变送器的小型化。 (2 )切换开关采 用由外部控制信号控制切换的开关,控制方便,整个变送器可做密封处理, 不易落灰, 延长变送器使用寿命。
采用本发明提供的一种变送器故障诊断方法带来的有益效果为: 当变 送器出现故障时, 断开变送器现有的传感器与信号处理模块之间的连接, 另外单独向信号处理模块输入一个标准信号值, 该标准信号值为传感器正 常工作时、 无故障时输出的检测信号范围中选取的一个固定值, 当信号处 理模块根据该标注信号输入的结构不正常时, 则可判断是信号处理模块出 现了故障, 如结果正常, 则可判断是传感器出现了故障。 检测方法筒单、 快速、 易于实现, 检测结果可靠。
附图说明
图 1所示为本发明提供的故障诊断电路的电路图。 图 3所示为本发明提供的故障诊断方法的流程图。
具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进 行清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没 有作出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的 范围。
如图 1所示, 为本发明提供一种变送器故障诊断电路, 包括: 传感器 11 , 用于检测物理量并形成检测信号; 检测的物理量可以是温 度、 压力、 液位、 流量等参数信息。
信号处理模块 12, 用于接收所述传感器的检测信号并进行处理后输 出; 信号处理模块 12对检测信号的处理主要是对其进行放大后输出。
标准信号输入模块 13, 用于向所述信号处理模块 12提供标准信号。 所述标准信号为从无故障状态下传感器 11 输出检测信号的范围中选取的 一个信号值。 该信号值作为标准信号, 用于体现传感器正常工作时、 无故 障时输出的检测信号。
切换开关 14, 所述切换开关 14与所述传感器 11和信号处理模块 12 连接, 同时还与所述标准信号输入模块 13和信号处理模块 12连接;
所述切换开关 14连接所述传感器 11和信号处理模块 12的同时断开所 述标准信号输入模块 13和信号处理模块 12; 或所述切换开关 14断开所述 传感器 11和信号处理模块 12的同时连接所述标准信号输入模块 13和信号 处理模块 12。
所述传感器 11包括压力传感器、 温度传感器、 液位传感器、 或流量传 感器。 在本实施例中, 如图 2所示, 传感器 11为压力传感器, 且所述压力 传感器为差分式压力传感器, 所述切换开关 14为双刀双掷切换开关。
如图 2所示, 所述差分式压力传感器的两个端脚分别接入所述信号处 理模块 12的正相输入端 IN+和反相输入端 IN-, 另外两个端脚分别接入所 述双刀双掷切换开关一侧的 A1脚和 A2脚, 所述标准信号输入模块 13的 两个端脚分别接入所述双刀双掷切换开关另一侧的 B1脚和 B2脚,所述双 刀双掷切换开关的两个切换刀 C分别接入所述信号处理模块的第一变送信 号输入端 IP1和第二变送信号输入端 IP2。如 1所示的电路图示出根据传感 器类型的不同, 比如差分式、 单信号等传感器, 其输出可以为单路信号或 多路信号, 相应的切换开关的 A1至 An, B1至 Bn做相应的数量变化, 输 入信号处理模块的第一变送信号输入端 IP1至第 n变送信号输入端 IPn也 做相应的数量变化。 图 2所示的实施例传感器采用差分式压力传感器。
在本实施例中,所述双刀双掷切换开关为由外部信号控制的切换开关, 外部的控制信号接入双刀双掷切换开关对其切换进行控制。 除本实施例提 供的切换开关外, 也可采用手动切换的切换开关, 通过手动进行切换。 本发明的故障检测电路在检测故障时, 首先操作切换开关 14切换电 路,使信号处理模块 12与标准信号输入模块 13连接, 断开传感器 11与信 号处理模块 12。 标准信号输入模块 13向信号处理模块 12输入一个标准的 信号,该标准信号是从传感器 11无故障状态下,正常工作时输出的检测信 号的范围中选却的一个值。信号处理模块 12根据正常的标准信号进行放大 处理后输出, 如输出结果也正常, 则可判断故障不在信号处理模块 12, 而 在传感器 11。 反之, 则故障在信号处理模块 12。 通过设置一个标准信号输 入模块 13 , 提供一个标准信号的基准参考信号, 通过切换开关 14进行切 换, 结构筒单、 故障判断清楚、 方便。 原理构造筒单、 成本低、 便于维护, 可在现有变送器基础上改进即可实现。 且占用空间小, 利于变送器的小型 化。
在本发明提供的另一优选实施例中, 不同之处在于, 所述压力传感器 为单信号的传感器, 相应的, 所述切换开关为单刀双掷切换开关, 所述压 力传感器的一个端脚接入所述信号处理模块, 另一端脚接入所述单刀双掷 切换开关的一侧, 所述标准信号输入模块的一个端脚接入所述单刀双掷切 换开关的另一侧,所述单刀双掷切换开关的切换刀接入所述信号处理模块。
本发明除了提供上述的故障诊断电路外, 还提供一种变送器故障诊断 方法, 如图 3所示, 包括如下步骤:
步骤 a: 当变送器出现故障时, 切断变送器内部传感器与信号处理模 块之间的信号传递。
步骤 b: 单独向信号处理模块输入一个标准信号。 所述标准信号为从 无故障状态下传感器输出检测信号的范围中选取的一个信号值。
步骤 c: 判断所述信号处理模块对所述标准信号进行处理后输出的信 号是否正常, 若正常则传感器存在故障, 若不正常则信号处理模块存在故 障。
当变送器出现故障时, 断开变送器现有的传感器与信号处理模块之间 的连接, 另外单独向信号处理模块输入一个标准信号值, 该标准信号值为 传感器正常工作时、 无故障时输出的检测信号范围中选取的一个固定值, 当信号处理模块根据该标注信号输入的结构不正常时, 则可判断是信号处 理模块出现了故障, 如结果正常, 则可判断是传感器出现了故障。 检测方 法筒单、 快速、 易于实现, 检测结果可靠。
本领域普通技术人员可以理解, 实现上述实施例方法中的全部或部分 步骤是可以通过程序来指令相关的硬件来完成, 所述的程序可以存储于一 计算机可读取存储介质中, 该程序在执行时, 包括如上述方法实施例的步 骤,所述的存储介质,如:磁碟、光盘、只读存储记忆体( Read-Only Memory, ROM )或随机存储记忆体(Random Access Memory, RAM )等。 在本发 明各方法实施例中,所述各步骤的序号并不能用于限定各步骤的先后顺序, 对于本领域普通技术人员来讲, 在不付出创造性劳动性的前提下, 对各步 骤的先后变化也在本发明的保护范围之内。
以上所述仅为本发明的较佳实施例而已, 并不用以限制本发明, 凡在 本发明的精神和原则之内, 所作的任何修改、 等同替换、 改进等, 均应包 含在本发明的保护范围之内。

Claims

权 利 要 求
1、 一种变送器故障诊断电路, 其特征在于, 包括:
传感器(11 ), 用于检测物理量并形成检测信号;
信号处理模块( 12 ),用于接收所述传感器的检测信号并进行处理后输 出;
标准信号输入模块( 13 ), 用于向所述信号处理模块( 12 )提供标准信 号;
切换开关( 14 ) , 所述切换开关( 14 )与所述传感器( 11 )和信号处理 模块(12 )连接, 同时还与所述标准信号输入模块(13 )和信号处理模块 ( 12 )连接;
所述切换开关( 14 )连接所述传感器( 11 )和信号处理模块(12 ) 的 同时断开所述标准信号输入模块( 13 )和信号处理模块( 12 ); 或所述切换 开关(14 ) 断开所述传感器(11 )和信号处理模块(12 ) 的同时连接所述 标准信号输入模块( 13 )和信号处理模块( 12 )。
2、根据权利要求 1所述的故障诊断电路,其特征在于:所述传感器( 11 ) 包括压力传感器、 温度传感器、 液位传感器、 或流量传感器。
3、根据权利要求 2所述的故障诊断电路, 其特征在于: 所述压力传感 器为差分式压力传感器, 所述切换开关(14 ) 为双刀双掷切换开关。
4、根据权利要求 3所述的故障诊断电路, 其特征在于: 所述差分式压 力传感器的两个端脚分别接入所述信号处理模块( 12 )的正相输入端( IN+ ) 和反相输入端 (IN- ), 另外两个端脚分别接入所述双刀双掷切换开关的一 侧(A ), 所述标准信号输入模块(13 )的两个端脚分别接入所述双刀双掷 切换开关的另一侧 (B ), 所述双刀双掷切换开关的两个切换刀 (C )分别 接入所述信号处理模块的第一变送信号输入端(IP1 )和第二变送信号输入 端 (IP2 )。
5、根据权利要求 4所述的故障诊断电路, 其特征在于: 所述双刀双掷 切换开关为由外部信号控制的切换开关、 或手动切换的切换开关。
6、根据权利要求 2所述的故障诊断电路, 其特征在于: 所述切换开关 为单刀双掷切换开关,所述压力传感器的一个端脚接入所述信号处理模块, 另一端脚接入所述单刀双掷切换开关的一侧, 所述标准信号输入模块的一 个端脚接入所述单刀双掷切换开关的另一侧, 所述单刀双掷切换开关的切 换刀接入所述信号处理模块。
7、根据权利要求 1至 6任一所述的故障诊断电路, 其特征在于: 所述 标准信号为从无故障状态下传感器(11 )输出检测信号的范围中选取的一 个信号值。
8、 一种变送器故障诊断方法, 其特征在于包括如下步骤:
步骤 a: 当变送器出现故障时, 切断变送器内部传感器与信号处理模 块之间的信号传递;
步骤 b: 单独向信号处理模块输入一个标准信号;
步骤 c: 判断所述信号处理模块对所述标准信号进行处理后输出的信 号是否正常, 若正常则传感器存在故障, 若不正常则信号处理模块存在故 障。
9、根据权利要求 8所述的故障诊断方法, 其特征在于: 所述标准信号 为从无故障状态下传感器输出检测信号的范围中选取的一个信号值。
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