Checkline P2 - Manual (Page 7)

ELECTROMATIC Equipment Co., Inc.
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This example has only been calculated for P2, but the temperature correction
can be calculated for both P4 and LM5. Your measuring device is adjusted to a
temperature of 28°C. The display of P2 with switch position S1 on proof plane
PP2 is 6.1%.
Tcf: Temperature correction factor corresponds to 0.04% (S1) moisture of paper
per 1°C.
Tcv: Temperature compensated value
Tcv = displayed value + (ambient temperature - 20°C) x Tcf
P2: Tcv= 6,1 + (28 – 20) x 0,04 results 6,4%
If your value is beyond the set range of adjustment tolerance a new adjustment
by the factory is necessary. If there is a linear deviation from the set values, you
can adjust the device to the zero point adjustment yourself. This is done as
follows:
Zero point adjustment
Shift the selector switch to S1, put off the lid of the battery compartment, take out
the battery (which must still be stuck to the connecting contacts). Then put off the
serial number tag carefully. Now hold the device into the air with one hand and
adjust the inner potentiometer as long as the following values appear on the
display: P2:1.3%, P4: 2.5%, LM5: 3.7%. Again the temperature correction value
must be taken into consideration. Put on the serial number tag again, insert the
battery and close the lid.
inner Potentiometer
Additional information ( for LM 5 only)
Switch positions 1 to 6 serve as an approach to the real quantity of moisture of
the material. The density of the material has the biggest influence on the
measuring result. For leather, the relevant range of density corresponds to 0.45
gram/cm³ for switch position 1 and 0.85 gram/cm³ for switch position 6. Various
manufacturing procedures can result in a change of up to two switch positions. A
higher moisture value is indicated on the display when measuring values lie
below or above the set measuring range. These values can be used as
reproducible comparative values and with the help of a conversion table you get
values corresponding to absolute moisture values. When measuring leather it is
especially important that the pressure against the material is the same pressure
when determining the switch position.
ELECTROMATIC Equipment Co., Inc.
-7-
7.0 MEASURING PRINCIPLE
The material in the measuring field is penetrated by an electromagnetic field
whose features change due to the material's quantity of moisture. Because of the
characteristic polarity of the water molecule and the thus resulting high relative
permittivity of water (about 83) the capacity of the measuring field changes
together with the changing moisture of the measuring sample.
Measuring plate at the
back of the instrument
8 x 5 cm
7 x 4,5 cm
Measuring instrument
P2, P4 Measuring plate
8cm long x 5cm broad x 1,3cm depth
LM5 Measuring plate
7cm long x 4,5 cm broad x 0,5cm depth
Caution! When the material thickness is below a certain limit, the measuring
result is falsified.