Sper Scientific 840034 Psychrometer - Anemometer - Manual (Page 19)

- 19 -
If you change to a new probe, you should input the
RH% calibration data enclosed in each probe. The
data will be recorded on a slip of paper shipped with
each probe. Please keep the paper for future use.
There are two calibrations that need to be input. The
first value is “Slope, S”; the second value is
“Intercept, Z.”
For Slope (value S):
1. While the meter is off, press the
Power button
plus
Mx/Mn plus Rec/Start at the same time for
two seconds. This takes you to the humidity slope
calibration mode. The LCD will display the current
saved S value and the last digit (flashing) is ready
to edit.
2. If the saved S value is different from your slip of
paper, press Hold to move to the value you want
to edit and then use
Mx/Mn to change the value.
3. Press
Enter to save the new S value. The meter
will advance to the intercept (value 2) screen au-
tomatically.
Note: While setting the slope, only input five digits
after the decimal point. You will need to round off the
sixth digit. You should also input two digits before the
decimal.
Examples:
a. If the S value is 8.239678, you should enter
08 23968.
a. If the S value is 11.23968, you should enter
11 23968.
PROBE REPLACEMENT