Checkline BLL - Manual (Page 4)

 Electromatic Equipment Co. Inc.
-4-
You need to log the voltage and assign a moisture value to this voltage.
It is possible to do this live while taking a measurement by p[alcing the gauge
on the material.
Then you have to press the right button („V“). By
pressing this button you transfer the voltage value of
the sample. If this was successful, you will jump
automatically to the next line. The actual calculated
water content has to be typed in by hand.
To save the values you have to leave the menu item
by pressing the shift button ( ) first, and afterwards
the symbol with the opened door ( ).
In case you have no moisture content value at the point you take this
measurement, it is best you create a list and enter the curve at a later point in
time.
Both values can be set manually.
There is a maximum of 16 index points available. However, as many calibration
points as possible should be affiliated.
With the final calibration curve you can measure up to the driest calibration
point you determinate. For example: lowest measured point: 22.0% => material
over 22.0% water content can be measured!
We recommend that the captured voltage and water contents are inscribed in a
graphic. Not linear points can be corrected. The values should be (as shown in
the example below) almost on a straight line.
V %
2,878 49,20
2,722 44,90
2,488 41,00
2,311 36,70
2,102 32,50
1,798 28,20
1,600 24,50
1,400 19,10
1,200 15,60
10,00
20,00
30,00
40,00
50,00
1 1,5 2 2,5 3
To save the values you have to leave the menu item by pressing the shift
button ( ) first, and afterwards the symbol with the opened door ( ).
To be sure that all values are correct and in the right order, please double
check the whole values in the calibration curve!
 Electromatic Equipment Co. Inc.
-5-
5.0 TEMPERATURE COMPENSATION
For the temperature compensation a factor is specified by the manufacturer.
In almost all products the entered values will be correct. You do not have to
change this value in general!
If you however still need to determine some new values, please advance as
follows: To achieve a very precise factor take several probes of your sample
with exactly the same water content and pack them into air proof plastic bags
(or something else). Now you have to align the samples to different
temperatures. One sample at 20°C (68°F), a further at 5°C (41°F) and a third at
40°C (104°F). After the aligning you have to measure the three samples again.
IMPORTANT: Let your humimeter also align to the different temperatures.
Using the following calculation you can determinate the temperature
compensation coefficient. e.g.: You measure the sample with the humimeter at
20°C and get a value of 30% water content, and the sample at 5°C you
measure just 28%.
So you can calculate:
So the factor is: 1.07 at 5°C
07 . 1
28
30 

TK