老外学仪表-02 如何校验差压变送器

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参考译文如下（译者：自控小春）：

Today I want to tell how to calibrate a differential pressure transmitter and instruments used for doing calibration.

今天我想介绍下如何校准差压变送器以及用于校准的仪器。

HART Communicator: So do you know what is HART?

HART通讯器：你知道HART是什么吗？

The HART(Highway Addressable Remote Transducer) protocal is one of the most popular industrial protocols today. According to emerson there is a huge installed base of 4 to 20 milliAmps systems throughout the world.

HART协议（可寻址远程传感器高速通道的开放通信协议）是现如今最流行的工业用协议之一。正如爱默生所说，世界上安装有庞大数量的基于4到20毫安的系统。

what is Loop Calibrator?

For process calibration professionals, loop calibrators are essential tools for working with 4 to 20 milliAmps current loops. Process control loop calibrators provide milliAmps sourcing, simulation and measurement, readouts in both milliAmps and % of span, 24 Volts loop supply.

那什么是回路校准器？对于专业的过程校准人员来说，回路校准器是处理4至20毫安电流回路工作的基本工具。过程控制回路校准器提供毫安电流源，仿真和测量，毫安和百分比跨度的示数，24V回路电源。

What is Digital Pressure Calibrator means?

It is a portable pressure indicator, This micro processor based instrument uses an internal transducer to measure and display pneumatic pressures applied to the connection port, This contains pneumatic hand pump , volume adjuster & vent valve.

什么是数字压力校准器？它是一种便携式压力指示器，这种基于微处理器的仪器通过内部传感器来测量和显示施加到连接端的气动压力，包括气动手泵、容积调节器和排气阀。

CALIBRATING DIFFERENTIAL PRESSURE TRANSMITTER:

校准差压变送器（的过程）：

1. Static pressure test: Give equal pressure on both sides of the transmitter, Zero should not shift, If it is shifting carry out static alignment.

1、静压试验：在变送器两侧施加相同的压力，零点不应移位，如果移位，则进行静态校准。

2.After completing static test then give Zero pressure to High Pressure side of transmitter and check the corresponding 4 milliAmps in the loop calibrator.

2、完成静态测试后，向变送器的高压侧施加零压力，并检查回路校准器中对应的4毫安。

3.Low Pressure side should be vented to atmosphere.

3、低压侧置于空气中。

4.If it is not showing the corresponding milliAmps the using HART do the lower sensor trim.

4、如果未显示对应的毫安值，则使用HART做传感器低端配平。

5.After this apply full range of transmitter using Digital pressure Calibrator and check the corresponding 20 milliAmps .

5、之后，用数字压力校准器做变送器满量程试验并检查对应的20毫安示数。

If it is not showing the corresponding milliAmps the adjust 20 millliAmps by doing Upper sensor trim using HART.

如果未显示对应的毫安值，则使用HART做传感器高端配平以校正到20毫安示数。

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