Ahlborn ALMEMO 710 - 14.3 Two-point sensor adjustment; 14.4 Averaging

14. Wizards
The function ´Calculate´ produces the result, displayed on the next page.
Base value, factor, exponent, and in special cases also zero-point and gain are
used.
14.3 Two-point adjustment
Two-point adjustment without a zero-point is not exactly straightforward. How-
ever, we have the ´Two-point adjustment´ wizard to help.
1. Set up calibration resources for setpoint 1.
Enter setpoint 1 Setpoint 1 07.00 pH
Either enter measured value in actual value 1 or
transfer measured value to actual value 1 Actual value 1 07.32 pH
2. Set up calibration resources for setpoint 2.
Enter setpoint 2 Setpoint 2 10.00 pH
Either enter measured value in actual value 2 or
transfer measured value to actual value 2 Actual value 2 09.87 pH
The function ´Calculate´ produces the result, displayed on the next page.
Zero point -0.32
Gain -0.1689
With pH probes you can by pressing the ´Clr´ key restore the default
values, namely base value 7.00 and gain -0.1689. If a sensor is
locked it can be temporarily unlocked using the help box.
14.4 Averaging
The average value for a measured value is needed for various applications.
e.g. Smoothing a widely fluctuating measured value (e.g. wind, pressure, etc.)
Average flow velocity in a ventilation conduit
Hourly or daily average values for weather data (temperature, wind, etc.)
Also for consumption values (electric current, water, gas, etc.)
The average value
M
of a measured variable is obtained by adding together a
series of measured values (M
i
) and then dividing this total by the number of
measured values used (N).
Average value
M=(
∑
i
M
i
)/N
ALMEMO
®
devices offer several different averaging modes.
These include measured value smoothing per selected channel with a sliding av-
eraging window, averaging over individual measuring operations selected by lo-
cation or by time, averaging over the full actual measuring duration, over a cy-
cle, or over specified measuring channels.
Users can, using the ´Averaging´ wizard, try all these modes in order to familiar-
ize themselves with the parameters required by each and the operating meth-
ods. There is also the ´Volume flow´ wizard, which can be used to calculate vol-
ume flow from the average velocity and the cross-section of a flow channel.
68 ALMEMO
®
710
