。 1. Preparations for pressure transmitter before installation: ① Before installation and use, please read the product samples and instruction manuals in detail; ② During operation, the pressure interface cannot be leaked unless the measuring range and wiring are correct .
2. When the pressure transmitter is installed, pay attention to the work: ⑴ In the use of sensors and transmitters, periodic inspection should be performed according to industry regulations. 安装 During installation, strong electromagnetic interference should be avoided around the sensors and transmitters; the housings of pressure sensors and transmitters generally need to be grounded; signal cables should not be mixed with power cables.
在 使用过程中，会出现一些常见的故障。 During the use of the capacitive pressure transmitter , some common failures will occur. For most users, if it is found that a sensitive part is malfunctioning, there is generally no way to repair it by itself, and the manufacturer should be contacted to replace its overall part. 变送器 在 使用过程中，出现故障分析与 处理方法： The following is the failure analysis and processing method of the transmitter during use :
● Inspection of transmitter measurement section
Failures in the measurement part of the transmitter will cause the transmitter to have no output or the output signal is abnormal, so you should first check the measurement-sensitive parts of the transmitter. 100V 的情况下，绝缘电阻不应小于 100MΩ 。 During the inspection: ①. Remove the compensation board, do not remove the sensitive parts, check the insulation resistance of the plug for the housing. When the voltage does not exceed 100V , the insulation resistance should not be less than 100MΩ . ②.Remove the flange and check whether the isolation diaphragm of the sensitive component is deformed, damaged or leaked.
● Inspection of transmitter circuit
接通电源，在给定输入压力信号后，如果变送器输出过高，或者输出过低，且改变输入压力信号和调整零点、量程螺钉时输出均无反应。 1. After turning on the power, after the input pressure signal is given, if the transmitter output is too high or the output is too low, and the input pressure signal is changed and the zero and range screws are adjusted, the output does not respond. “ 振荡控制电路部分 ” 工作是不是正常。 For this kind of failure, in addition to checking whether there is any abnormality in the sensitive part of the transmitter measurement part, you should check whether the " oscillation control circuit part " on the transmitter amplifier board is working properly. ； 各部分的元器件有无损坏问题等。 Secondly, check the working conditions of the operational amplifiers on the amplifier board ; whether the components of each part are damaged. This type of failure requires the amplifier board to be replaced.
接通电源，在给定输入压力信号后，检查变送器输出端电压信号的状态。 2. Turn on the power and check the status of the voltage signal at the output of the transmitter after the input pressure signal is given. ， 是不是符合供电要求 ， 电源与变送器 以 及负载设备之间有没有接线错误。 If there is no output voltage, you should first check whether the power supply voltage is normal , whether it meets the power supply requirements , and whether there are any wiring errors between the power supply and the transmitter and load equipment. 没有 电压或者极性接反 都 可造成变送器无电压信号输出。 If there is no voltage on the transmitter terminals or the polarity is reversed, the transmitter will have no voltage signal output. ； 线路板接插件有 没 有接触不良现象，可采取对照正常仪表的测量电压与故障仪表对应的测量电压相比较的方法，确定故障点，必要的情况下可更换有故障的放大器板。 Excluding the above reasons, you should further check whether the components in the amplifier board circuit are damaged ; whether the circuit board connector has poor contact, you can take a method to compare the measured voltage of the normal instrument with the measured voltage of the faulty instrument to determine Fault point, if necessary, replace the faulty amplifier board.
施工现场出现的故障和现场故障检查 ★ Faults at the construction site and on-site fault inspection
Most of these failures are caused by improper use and installation of pressure sensors.
⑴ . 变送器接线不正确，电源电压过高或 者 过低，指示表头与仪表接线端子连接处接触不好。 There are several aspects to summarize: 变送器 . The transmitter wiring is incorrect, the power supply voltage is too high or too low, indicating that the connection between the meter head and the instrument terminal is not good. . 没有严格按照技术要求安装，安装方式和现场环境不符合技术要求。 ⑵ . Installation is not strictly in accordance with technical requirements, installation methods and site environment do not meet technical requirements. . 一次元件 ( 如 孔板、远传测量接头等 ) 堵塞或者安装形式不对，取压点不合理。 (3) The primary component ( such as orifice plate, remote measurement connector, etc. ) is blocked or the installation form is incorrect, and the pressure point is not reasonable. . Alas . Leakage or blockage of the impulse tube, residual gas in the liquid-filled tube, or residual liquid in the inflation tube, and deposits in the process flange of the transmitter, forming a dead zone for measurement.
The above failures of the pressure sensor and transmitter will cause the transmitter to output abnormally or the measurement will be inaccurate; however, after careful inspection, strict use and installation in accordance with technical requirements, and timely effective measures, these problems can be ruled out. For faults that cannot be handled, the transmitter should be sent to the laboratory or manufacturer for further inspection.