RH and T calibration and adjustment using HM40 - HM40 - RFL100

RFL100 User Guide
Document code
M211861EN
Revision
J
Language
English
Product
RFL100
Document type
User guide

  • Vaisala HM40 Handheld Meter

  • Connection cable for HM40 Handheld Meter (Vaisala item HMT120Z300)

  • Reference environments for the desired calibration and adjustment points

  • RFL100 data logger with the probe to be calibrated

You can calibrate and adjust RH and T measurement probes of your RFL100 data logger in 1 or 2 points using the HM40 handheld meter.

  1. Disconnect the probe from the data logger.
  2. Connect the probe to HM40 using the connection cable.
  3. Turn on HM40 and check that measurements from the probe are displayed on the screen.
  4. Select Menu > Settings > Time & Date and verify that the current time and date are set correctly on the HM40. Correct them if needed. The current date will be automatically set as the calibration date of the probe when adjustment is applied in 13.
  5. Select Menu > Calibration.
  6. Select the parameter to be calibrated at menu item [1] Quantity.
  7. Select number of calibration points at menu item [2] Point count.
  8. Place the probe in the first reference environment (first calibration point). Wait 20 – 40 minutes for the reading to stabilize.
  9. Select [3] Point 1 > Set. The meter now shows the currently measured value of the selected parameter. Set the reference value using the arrow buttons and select OK.

    Correction to measurement at point 1 is now shown in the text for menu item [3] Point 1. If you are only doing a 1-point calibration, skip to 12.

  10. Place the probe in the second reference environment (second calibration point). Wait 20 – 40 minutes for the reading to stabilize.
  11. Select [4] Point 2 > Set The meter now shows the currently measured value of the selected parameter. Set the reference value using the arrow buttons and select OK.

    Correction to measurement at point 2 is now shown in the text for the menu item [4] Point 2.

  12. Select [5] Note to edit the calibration info text that will be stored in the probe when the adjustment is applied in 13. Edit the text using the select button and arrow keys. When done, select the OK character in the bottom right corner. To exit without changing the text, select Cancel.
  13. Select [6] Apply to view the calibration result. Verify the corrections in the confirmation screen and select Apply to apply the adjustment to the probe, or Cancel to exit without applying the adjustment.
  14. Disconnect the probe from the HM40.
  15. Connect the probe to the data logger.