Page 13 of 33
in-hypalm-v40 / 20051205
Procedure
When more than one probe is connected to the instrument, select (display) the probe to be calibrated
prior to entering the function. When using the Adjust M.PT function, it is important to observe the following
rules:
a) Always calibrate temperature first (if temperature needs to be calibrated)
b) When calibrating temperature (2 points), always calibrate at the low value first. The instrument is
programmed to use the low temperature value to compute the offset and the high temperature
value to compute the gain.
T-low < 40 °C (104°F) : used to compute the calibration offset
T-high ≥ 40 °C (104 °F) : used to compute the calibration gain
For best accuracy, we recommend using a T-low value close to 20°C (68°F).
When calibrating relative humidity (2, 3 or 4 points) with the ROTRONIC humidity standards, always
follow the sequence 35 %RH, 80 %RH, 10 %RH or 5 %RH, 0 %RH. When using a reference other
than the ROTRONIC humidity standards, use reference conditions that are within the following
brackets and observe the sequence:
>25 %RH…≤55 %RH
1)
: used to compute the calibration offset
>55 %RH
1)
: used to compute the calibration gain
>1 %RH…≤25 %RH : sensor linearity adjustment
≤ 1 %RH : sensor linearity adjustment
The HygroPalm is programmed to
automatically recognize these brackets.
1) For best accuracy, we recommend using values close to 35 %RH and 80 %RH
When the probe is at equilibrium with the reference environment, activate the Adjust M.PT function and
make the appropriate selections:
a) RHS: press the ENTER key to select this item. The LC display shows the value read by the probe
at the time the ENTER key was pressed. The letters “RHS” are displayed on the message line.
Use the UP or the DOWN key to change the humidity value to match the mean value (at 23°C)
written on the certificate supplied with the standard. For a faster change, keep the key pressed
down. Press the ENTER key when done.
Note: in the RHS mode, the software automatically compensates for the effect of temperature on
the humidity standard. No additional correction is required.
b) Humidity or Temperature: press the ENTER key to select. The LC display shows the value read
by the probe at the time the ENTER key was pressed. The word “humidity” or “Temperature” is
shown on the message line. Use the UP or the DOWN key to change the humidity or temperature
value to match the value of the reference environment. For a faster change, keep the key
pressed down. Press the ENTER key when done.
After pressing the ENTER key, the message “sure?” should appear on the LC display. Press ENTER to
confirm. Next, the LC display will confirm that the probe adjustment has been successfully completed. At
that time, press ENTER to exit or MENU to return to the function Adjust M.PT and do another calibration
point.
Carry on in the same manner for each calibration point, following the sequence described above.
Note: you can exit the function at any time (without calibrating the probe) by pressing the MENU key.
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