Vaisala RFL100 User Manual page 33

You can calibrate and adjust the probe of your RFL100 data logger in one or two points using
the HM40. For a 2-point calibration, you need two reference environments. For example, LiCl
and NaCl salt chambers provide 11% and 75% relative humidity references. Note that when
performing a 2-point RH calibration, the first point requires a < 50% RH humidity reference,
and the second point must be > 50% RH. The difference between the two humidity references
must be at least 30% RH.
1. Disconnect the probe to be calibrated from the RFL100 Data Logger. See
the Probe (page
2. Connect the probe to the HM40 hand-held meter using the connection cable.
3. Turn on the HM40 and check that the measurements from the probe are displayed on the
screen.
4. Press the Menu button and select the Calibration submenu.
5. Select the parameter to be calibrated at menu item [1] Quantity. You can calibrate
Temperature (T) or Relative Humidity (RH) measurement. All other humidity parameters
are calculated from RH and T, so they will also be adjusted.
29).
Chapter 5 – Maintenance
Disconnecting
31