Prowirl 200 Medium Type Selection Overview
Prowirl 200 is a vortex flowmeter launched by Endress+Hauser, widely used for flow measurement of steam, gases, and liquids. Correctly selecting the medium type is the first step in instrument configuration and directly affects measurement accuracy and output signals.
The medium type determines the instrument's internal calculation model, unit system, and temperature-pressure compensation method. Selecting the wrong medium type will cause abnormal flow display or increased measurement error.
Medium Types Supported by Prowirl 200
Prowirl 200 provides multiple medium type options in the configuration menu, and users need to match them according to the actual process medium.
Common Medium Type Options
- Steam: Includes saturated steam and superheated steam, requiring temperature and pressure compensation.
- Gas: Such as air, natural gas, nitrogen, etc., requiring standard density or compressibility factor input.
- Liquid: Such as water, oil products, chemical solutions, etc., usually only requiring density parameters.
- Custom: Used for special media or scenarios where all parameters need to be entered manually.
Relationship Between Medium Type and Measurement Principle
The vortex flowmeter measures volumetric flow based on the Kármán vortex principle. Different medium types lead to different internal handling of density, viscosity, and compressibility factor.
For example, steam measurement requires real-time temperature-pressure compensation, while liquid measurement usually only requires setting a fixed density.
Medium Type Selection Steps
Enter the configuration menu through the local display or commissioning software, and operate according to the following steps:
- Enter the Setup menu and select the Medium option.
- In the medium type list, select the option that matches the actual process, such as Steam, Gas, or Liquid.
- According to the selected medium, enter the necessary additional parameters, such as density, temperature, pressure, or compressibility factor.
- After confirmation, save the settings and check whether the flow display is normal.
- If necessary, verify the correctness of the configuration through analog output or actual flow.
Comparison of Parameters for Different Medium Types
The following table lists the key parameters required for common medium types of Prowirl 200, facilitating engineering selection and configuration reference.
| Medium Type | Temperature-Pressure Compensation Required | Key Input Parameters | Typical Applications |
|---|---|---|---|
| Saturated Steam | Required | Pressure or Temperature | Heating, Boilers |
| Superheated Steam | Required | Pressure + Temperature | Power Generation, Process Steam |
| Gas | Usually Required | Standard Density, Pressure, Temperature | Natural Gas, Compressed Air |
| Liquid | Generally Not Required | Density | Water, Oil Products, Chemical Liquids |
Precautions for Selecting Medium Type
Medium type selection not only affects the display unit but also relates to the calculation accuracy of the output signal and totalized flow.
- Confirm whether the medium undergoes a phase change under operating conditions, such as steam possibly condensing into water.
- For gas measurement, pay attention to the influence of the compressibility factor on accuracy, especially under high-pressure conditions.
- For liquid measurement, if the viscosity is high, confirm whether the Reynolds number requirements of the vortex flowmeter are met.
- After changing the medium type, recheck the range settings and low flow cutoff parameters.
Common Questions and Recommendations
What Happens If the Medium Type Is Selected Incorrectly?
If the medium type is selected incorrectly, the instrument may output an incorrect flow value, or temperature-pressure compensation may fail, causing measurement deviation. It is recommended to perform zero point verification and actual flow comparison after configuration is completed.
How to Confirm That the Medium Type Setting Is Correct?
It can be verified in the following ways:
- Check whether the displayed value is consistent with process experience values.
- Use simulation mode to input a known signal and observe whether the output corresponds.
- Consult the medium property table to verify whether parameters such as density and pressure are entered correctly.
Correctly selecting the Prowirl 200 medium type is the foundation for ensuring the stable operation of the flow measurement system. It is recommended that process and instrument personnel jointly confirm it during the commissioning stage.