压力变送器参数英文

Pressure Transmitter Parameters in English

A pressure transmitter is a device used to measure and transmit the pressure of a fluid or gas. It is widely used in various industries such as oil and gas, chemical, pharmaceutical, and automotive. Understanding the parameters of a pressure transmitter is essential for proper installation and operation.

1. Pressure Range: This parameter specifies the minimum and maximum pressure range that the transmitter can measure. It is usually expressed in units of psi (pounds per square inch) or bar.

2. Accuracy: Accuracy indicates how closely the measured value corresponds to the true value. It is typically expressed as a percentage of full scale span. For example, an accuracy of ±0.5% means that the actual pressure can deviate by up to 0.5% from the displayed value.

3. Output Signal: The output signal of a pressure transmitter can be analog or digital. Common analog signals include 4-20mA and 0-10V, while digital signals include Modbus, HART, and Profibus.

4. Pressure Connection: This parameter refers to the type of connection used to attach the transmitter to the process piping. Common types include threaded, flanged, and sanitary connections.

5. Electrical Connection: The electrical connection determines how the transmitter is connected to the control system. It can be through a terminal block, cable gland, or connector.

6. Process Temperature: The process temperature range specifies the limits within which the transmitter can operate reliably. It is typically given in degrees Celsius or Fahrenheit.

7. Isolation Diaphragm: Some pressure transmitters come with an isolation diaphragm that separates the process fluid from the sensing element. This is useful for measuring corrosive or viscous fluids.

8. Wetted Material: The wetted material refers to the materials in contact with the process fluid. Common materials include stainless steel, Hastelloy, and ceramic.

9. Protection Rating: The protection rating indicates the level of protection against dust and water ingress. It is expressed using the IP (Ingress Protection) code, such as IP65 or IP67.

10. Certifications: Pressure transmitters may need specific certifications depending on the industry and application. Common certifications include AT*, CSA, and CE.

In conclusion, understanding the parameters of a pressure transmitter is crucial for selecting the right instrument for your application. Whether it's pressure range, accuracy, output signal, or other specifications, these parameters help ensure reliable and accurate measurements. Consult the manufacturer's documentation for detailed information on a particular pressure transmitter model.