Overview of Prowirl 73 Current Output Range Setting

Prowirl 73 is a vortex flowmeter launched by Endress+Hauser, widely used for flow measurement of gases such as compressed air. The current output (4-20 mA) range setting is a critical step in on-site commissioning, directly affecting the accuracy of signal acquisition.

Taking compressed air as an example, this article details how to set the current output range through the local display menu. Before operation, ensure that the device is properly installed and powered, and that you have permission to access the parameter matrix.

Prowirl 73 current output range setting interface

Detailed Setting Steps

1. Enter the Current Output Setting Menu

  1. On the measurement screen, press the E key to enter the main menu.
  2. Use the + or - keys to select the "Setup" menu, then press E to confirm.
  3. Select "Current output" and press E to enter.
  4. Select "Current output 1" or "Current output 2" (depending on wiring), then press E to confirm.

2. Set the Flow Value Corresponding to 4 mA

  1. In the current output menu, select "4mA value" and press E to enter.
  2. Enter the flow value corresponding to 4 mA (usually 0), then press E to confirm.
  3. If you need to change the unit, return to the upper menu and select "Unit" to set it.

3. Set the Flow Value Corresponding to 20 mA

  1. Select "20mA value" and press E to enter.
  2. Enter the full-scale flow value (e.g., the maximum flow of compressed air), then press E to confirm.
  3. Check whether the range setting is reasonable, ensuring that the 20 mA value is greater than the 4 mA value.

4. Save and Exit

  1. Press the E key to save the settings. After "Save" appears on the screen, confirm.
  2. Press the E key repeatedly to return to the measurement screen.
  3. Observe whether the current output changes with the flow. If necessary, verify with a multimeter.
Prowirl 73 current output range setting completion interface

Key Parameters and Precautions

ParameterDescriptionTypical Value
4mA valueFlow corresponding to the lower current output limit0 Nm³/h
20mA valueFlow corresponding to the upper current output limitSet according to operating conditions
UnitFlow unitNm³/h, kg/h, etc.
Damping timeOutput response time1-5 seconds
  • Turndown ratio: It is recommended that the actual flow be between 10% and 90% of the range to ensure accuracy.
  • Compressed air: Temperature and pressure compensation must be considered. If not compensated, set the volumetric flow under operating conditions.
  • Current output: Ensure that the load resistance is within the allowable range (usually ≤ 500Ω).
  • Save: After modification, be sure to save; otherwise, it will be lost after power-off.

Common Problems and Troubleshooting

  • No change in current output: Check whether the wiring is correct and whether the range is set inversely (4 mA > 20 mA).
  • Large deviation in output value: Confirm whether the flow unit, pipe parameters, and compensation settings are correct.
  • Cannot enter the menu: Check whether write protection is enabled; a password may be required or contact the administrator.

By following the above steps, you can efficiently complete the Prowirl 73 compressed air current output range setting, ensuring accurate transmission of the flow signal to the control system.