Checkline LM6 User Manual
CHECK•LINE
BY ELECTROMATIC
LM6
LEATHER MOISTURE METER
®
Operating Manual
TABLE OF CONTENTS
1.0 Introduction ………………………………………………………..… ................... 2
1.1 Operation and handling
1.2 Measuring procedure
2.0 Calibration curves ……………….………………………………...… ................ 3
2.1 Selection of calibration curves
3.0 Determination of the reference water content ………………….… .......................... 4
3.1 Short description of norm DIN53304
4.0 Design of the device… ................................................................................................ 5
4.1 Menu
4.2 Key functions in the menu
5.0 Common reasons for incorrect measurements …….…….………..… ...................... 7
6.0 Looking after the instrument ………………………………..………… ................. 7
6.1 Exemption from liability
7.0 Changing the batteries ………………………………………………..… ................ 8
8.0 Calibration ………………………………………….……………………… ............ 9
8.1 Checking the calibration
8.2 Calibration procedure
9.0 Technical data ….…………………………………………………….… ................ 11
10.0 Warranty ………………………………………………………….…… .............. 12
0
–1 –
1.0 INTRODUCTION
1.1 Operation and handling
Switching on: Press the button for 3 seconds.
Changing the calibration curve: or key.
Switching on the display lighting: Press the button briey; the lighting
switches off automatically after approx. 20 seconds. Pressing any key activates the
lighting again and prolongs the switch-off time to 4 minutes.
Switching off: Press the key for 5 seconds; the device will switch off after releasing
the key. After approx. 4 minutes the device will switch off automatically.
1.2 Measuring procedure
1. Switch on the humimeter LM6 by pressing the key for 3 seconds.
2. Select the appropriate calibration curve using the arrow keys. Hold the device in
one hand and press it onto the leather well-setted (4 kg compacting pressure).
The leather pile has to be at least 10mm high!
3. The display shows the water content immediately (large numbers).
– 2 –
2.0 CALIBRATION CURVES
NAME CALIBRATION CURVE DENSITY
Leather LD Leather of low density 0.55 g/cm³
Leather CR Leather chrome tanned 0.60 g/cm³
Leather MD Leather of medium density 0.65 G/CM³
Leather FOC
Leather HD Leather of high density 0.75 g/cm³
Leather VHD Leather of very high density 0.80 g/cm³
Reference Only for checking the instrument
Leather free of chrome, re
protection leather
0.70 g/cm³
2.1 Selection of calibration curves
Due to different manufacturing methods and different densities of the leather there is no
standardised allocation of calibration curves.
In the above list of calibration curves you can nd information regarding manufacturing
methods and density that enables a preselection of the calibration curve.
To ensure the best accuracy of your measurement, we recommend to carry out a
comparison measurement by kiln-drying (norm DIN 53304) once:
1. Take a leather pile of 10-15mm of the format A6 with average moisture content.
2. Measure the water content of this leather pile using all available calibration curves
and write down the measuring results of the different calibration curves.
3. Take the 2 top leather pieces of the pile and carry out a reference measurement
according to DIN 53304.
4. Compare the determined reference water content with the measuring results of the
different calibration curves. Use the calibration curve with the measuring result
nearest to the reference water content.
– 3 –
3.0 DETERMINATION OF THE REFERENCE WATER CONTENT
100% ×
−
=
Mn
MtMn
WG
Mn: Mass with average moisture content
The humimeter LM6 determines the water content, which means that it calculates the
moisture referred to the total mass (DIN53304):
Mt: Mass of the dried sample
%WG: Calculated water content
3.1 Short description of norm DIN53304
Take a leather piece according to DIN 53302 T2 or DIN 53303 T2. For the
determination of the water content, weigh the leather piece with an accuracy of 0,001
g (mass Mn). Put the piece of leather in a glass bowl that was dried at (102 ± 2) °C
and was weighed after cooling to room temperature. Dry the opened glass bowl in a
drying chamber at (102 ±2) °C for 5 hours. After closing the glass bowl cool it in an
exsiccator. Now determine the mass (Mt). After that, go on with the above described
drying procedure in the drying chamber for one further hour, cool and weigh again. If
the weight after the second drying period decreases less than 0.1 % of the initial weight,
the assay is nished. If the decrease of weight is higher than 0.1 %, the drying has to be
continued. The total period of drying must not exceed 8 hours.
–4 –
Loading...