1-point adjustment of T measurement (HMP110, HMP113, and HMP110T) - HMP110 - HMP113 - HMP60 - HMP63

HMP60 and HMP110 Series User Guide

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User guide
You can also use Vaisala Insight software for performing calibration and adjustment. See Vaisala Insight software.

To perform a 1-point adjustment to the temperature measurement of the HMP110, HMP113, or HMP110T using serial line, you need:

  • Vaisala USB cable (item code 219690)
  • PC with a terminal application
  • One known and stable temperature reference
  1. Connect the USB cable to the PC, but do not connect it to the probe yet.
  2. Remove the filter from the probe and insert the probe in the temperature reference.
  3. Start a terminal application and set the correct connection settings. The default serial settings are 19200 8 N 1. Remember to check which COM port the USB cable is using.
  4. Wait for 20 … 40 minutes for the temperature to stabilize.
  5. Start the terminal session and connect the USB cable to the probe. If your probe is in the analog output mode, you need to press ENTER a few times to start it in RS-485 mode.
  6. Verify that the connection works by giving the ? command.
    If the probe does not respond with device information:
    • Disconnect the USB cable from the probe and retry. If your probe is in the analog output mode, press ENTER a few times immediately after connecting the USB cable.
    • Try the ?? command in case the probe is in POLL mode, open the line using OPEN command if necessary.
    • Check your serial line settings and cable connections.
  7. When your serial connection is working, use the L command to see the current user adjustment parameters.
  8. Use the ERRS command to see that no errors are active.
  9. Give the CT command, with the temperature value of the reference as a parameter.
    ct 23.5
  10. Check with the L command that the user adjustment parameters have changed.

    If you wish to remove the effects of T calibration (returning the T measurement of the probe to the factory calibrated state).