Humimeter.com P2 Manuel utilisateur

Usermanual

Paper resp. Leather

Moisture Meter

LM5

Version 2.2_en

2005

Page 2 Schaller GmbH Version 2.2_en

Quality information:

Congratulations on purchasing this product at

Messtechnik Schaller GmbH (Ltd.).

We would like to inform you that your measuring device

corresponds to the CE norms EN50081 and EN50082.

The function of your instrument has been examined and

calibrated before delivery.

Application

P2: Mainly for very strong paper, packing paper,

cardboard

P4: Mainly for paper used for offset printing

LM5: mainly for leather

First setting into operation:

Your measuring device should be supplied with a battery

by the manufacturer. If this is not the case, open the

battery compartment and stick a 9 V block battery or a

charged accumulator onto the connecting contacts. Then

put the battery in the battery compartment. Make sure

that the power cable does not get caught in the lid. Press

the power switch (ON) at the front of the instrument and

the display will go on. If this is not the case, check if the

batteries are charged. If you hold your measuring

instrument in the air you will see a certain value on the

display depending on the switch position. Now you can

compare this value to the rated values according to

tables on pages 9 and 10. Furthermore it is advisable to

check the measuring device at the proof plane which is

the bottom of the wooden case.

Version 2.2_en Schaller GmbH Page 3

Measuring procedure

Exact measuring results can best be achieved by

adjusting the measuring instrument to the respective

product temperature. So you should store the device

near the object you wish to measure. A temperature

difference of more than 5 °C results in a falsified

measured value. Adjust the switch by shifting it to the

correct position (refer to type of product). Turn on your

measuring device and put it on the product with suitable

pressure or move it with constant pressure lengthwise

along the product roll to detect the wet streak.

Take care that you hold your measuring instrument with

a moderate but sufficient pressure on the product

because the compressed density influences the

measuring result. Make sure that you always exert the

same amount of pressure since the density of the

material increases when it is pressed tighter or softer; so

you could get different measuring results every time you

measure the material. The absolute density can

immediately be seen on the LC-Display. Please note that

the bigger the supporting surface of the sensor, the more

exact is the measurement (refer to sketch). The device

turns off automatically after 90 seconds or when the

measuring range has been exceeded.

Firmly press the

instrument on

the pile in the

middle

Paper piles must

be at least 2 cm

thick, leather piles

at least 1 cm

incorrect

Press the

instrument only

lengthwise on the

paper roll

Page 4 Schaller GmbH Version 2.2_en

How to choose type of product

Since there is no unified manufacturing process of the

measuring products the adjustment of the switch can not

be standardized. But there is always the possibility of

having your device calibrated by Messtechnik Schaller

GmbH (Ltd.). In this case we need a pile of your product

(2 cm thick) size A4 in a plastic wrapping that is as tight

as possible. You can classify your products by means of

a comparison measurement applying methods

appropriate for verification according to DIN20287. Take

a 2 cm thick pile with an average quantity of moisture

size A5, weigh some of the sheets and dry them in a

drying stove. Store the rest of the paper in a plastic

wrapping to preserve the moisture. The dried sheets of

paper are weighed again. By using the following formula

the absolute moisture is calculated.

Caution! The dried sheets of paper must not be used for

measurement again.

Mn: mass of sheets with an average moisture.

Mt: mass of dried sheets

%F: calculated absolute moisture.

100% ×

−

=MnMtMn

Now take the rest of the pile out of the plastic wrapping

and measure it with your measuring device. Adjust the

switch until the most exact value can be seen on the

display and note down the position of the switch.

Version 2.2_en Schaller GmbH Page 5

Verification and correction of switch

position

Now weigh the rest of the material sample, store it in

more humid or drier ambient conditions than where your

calibration has been carried out. Do not forget to adapt

the measuring device to the corresponding temperature.

Then weigh your pile once more, calculate the moisture

value by means of weight applying the formula of control

value calculation, measure this moisture value and

compare the result with the display

Control value calculation:

Mter : Calculated dry mass of your control sample

Mnk : mass of the remaining material

(

)

100

%100 FMnk

Mter

−

Mnneu : new mass by drying or moistening

%Fneu : New moisture value for comparison

measurement

Now insert the switch position in the table.

Please note: Messtechnik Schaller GmbH (Ltd.) provides

special versions of P2, P4 and LM5 adapted to certain

products. Refer to additional information on leather,

page 11.

Page 6 Schaller GmbH Version 2.2_en

Measuring method

Even if the kiln drying method is the only measuring

procedure appropriate for verification according to DIN

20287 it is time consuming, in-situ application can very

seldom be carried out; the method also has the

disadvantage that the samples are destroyed. Schaller

GmbH (Ltd.) has developed the P2, P4 and LM5

generation – a measuring method which provides exact

measuring results within seconds. Yet it is not possible

to develop a measuring device that is ideal under every

single condition; even P2, P4 and LM5 have a certain

limited range to provide optimum results. In order to

minimize incorrect applications resulting from that fact

we have provided you

with a list.

Important! Here are the most common

reasons for measuring errors.

•Product temperature beyond ambient conditions:

The temperature of the measuring device and of

the product should be nearly equal.

•Wrong switch position

•Uneven pressing

•Wrong application on rolls

Press your measuring device lengthwise to the

longitudinal axis of the product roll, otherwise the

bearing area of the sensor is too small.

•Product pile not thick enough

•Electrically conductive material

All metallic objects as well as electrically

conductive packaging film or paper coloured with

carbon black influence the measuring result in a

negative way and must no be positioned within a

range of 500 mm below the sensor area.

Version 2.2_en Schaller GmbH Page 7

•Exceeding of measuring range:

This can occur depending on the type of product

and the position of the selector switch. It is

indicated on the display by blinking and means that

the measuring accuracy is less precise.

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.

Page 8 Schaller GmbH Version 2.2_en

Exclusion of liability

The producer can not be made liable for any measuring

errors and the damage that might result from it. This

measuring principle is a quick measuring procedure

which can be influenced by product and user-specific

margin conditions. Therefore it is recommended to carry

out a plausibility check of the measured values. In every

measuring device there is a serial number and a seal of

warranty. If this seal is broken no warranty claims will be

accepted. In case of defect send back your measuring

device to Messtechnik Schaller or your dealer. The

device must be sufficiently packaged for protection

reasons. (refer to technical support)

Care regulations

In order to guarantee that your measuring device is kept

in good condition, please take care that it is not imposed

to too much mechanical strain (it should not be dropped

or exposed to excessive temperatures). Always use a

dry cloth when cleaning your measuring device because

it can be destroyed by incoming water or other cleaning

agents.

Do not leave your device unattended – put it back into

the delivered wooden case after the measuring

procedure.

We recommend an ISO-approved examination of the

device in regular intervals by applying the kiln method or

by using the enclosed proof plane PP2 (base plate of the

wooden case)!

If needed, Messtechnik Schaller GmbH (Ltd.) will also

carry out a calibration at your expense. In this case a

calibration certificate will be issued and delivered.

Version 2.2_en Schaller GmbH Page 9

ISO-approved examination of the

instrument

The surface of the proof plane PP2 must not be

scratched and must be free of dust, dirt, fats and

moisture.

Field of application: temperatures ranging from 10°C to

30°C, relative humidity 30-80%

Procedure of examination

Torn on the device, place it in the middle of the proof

plane PP2 and press firmly onto it. Now check the

values on the display against the set measuring values

in the table and fill them in the provided table. We have

defined the ideal temperature for your device – 20°C, but

it can range between 17°C and 23°C. If an adjustmen t is

not possible, a calculated correction of the temperature

of the displayed value is necessary. The corrected value

and the set value must be within the range of tolerance.

Set measuring values for PP2 should be at a

temperature of 20°C.

Switch

set measuring

value adjust readjust

position

tolerance

S1 6.4 4.3 0.6 0.9

S2 5.8 4 0.6 0.9

S3 5.1 3.7 0.5 0.8

S4 4.5 3.3 0.5 0.7

S5 3.8 3 0.4 0.6

S6 3.1 2.6 0.4 0.6

Value when held up in the air at switch position 1 is:

P2= 1.3% und P4= 2.5%

range of adjustment tolerance by the plant 0.6%

Page 10 Schaller GmbH Version 2.2_en

switch

set measuring

value adjust readjust

position

LM5 tolerance tolerance

S1 11,9 0,9 1,5

S2 11 0,8 1,3

S3 10,1 0,8 1,1

S4 9,2 0,7 1,0

S5 8,2 0,6 0,9

S6 7,2 0,5 0,8

Value when held up in the air at switch position 1 is:

LM5= 3,7%

range of adjustment tolerance by the plant 0,8%

Example of temperature correction

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

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:

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