KERN & SOHN CM 50-C2N User Manual

KERN & Sohn GmbH
Ziegelei 1 D-72336 Balingen E-Mail: info@kern-sohn.com
KERN CM
Version 1.8 10/2006 GB
Tel: +49-[0]7433- 9933-0 Fax: +49-[0]7433-9933-149 Internet: www.kern-sohn.com
CM-BA-e-0618
GB
KERN CM
Version 1.8 10/2006
Operation instructions Pocket Balance
Table of contents
1 Technical data ----------------------------------------------------------------------------------- 3 2 Declaration of conformty--------------------------------------------------------------------­3 Fundamental information (general)-------------------------------------------------------
3.1 Intended use------------------------------------------------------------------------------------------- 5
3.2 Inappropriate use------------------------------------------------------------------------------------- 5
3.3 Guarantee---------------------------------------------------------------------------------------------- 5
3.4 Monitoring the test substances ------------------------------------------------------------------- 5
4 Fundamental safety information----------------------------------------------------------- 6
4.1 Observe the information in the operating instructions -------------------------------------- 6
4.2 Staff training ------------------------------------------------------------------------------------------- 6
5 Transport and storage ------------------------------------------------------------------------ 6
5.1 Acceptance check------------------------------------------------------------------------------------ 6
5.2 Packaging ---------------------------------------------------------------------------------------------- 6
6 Unpacking, installation and commissioning ------------------------------------------ 6
6.1 Place of installation, place of use ----------------------------------------------------------------6
6.2 Unpacking---------------------------------------------------------------------------------------------- 7
6.2.1 Installation ----------------------------------------------------------------------------------------------------7
6.2.2 List of items supplied--------------------------------------------------------------------------------------- 7
6.3 Battery operation and change--------------------------------------------------------------------- 7
6.4 Draft shield + weighing container (CM 50-C2N, CM 500-GN1) -------------------------- 8
6.5 Initial start-up ------------------------------------------------------------------------------------------ 8
6.6 Adjustment --------------------------------------------------------------------------------------------- 8
6.7 Adjusting------------------------------------------------------------------------------------------------ 8
7 Operation------------------------------------------------------------------------------------------ 9
7.1 Overview of display CM 60-2N / CM 150-1N / CM 320-1N / CM 1K1N ---------------- 9
7.2 Overview of display CM 50-C2N ----------------------------------------------------------------- 9
7.3 Overview of display CM 500-GN1 --------------------------------------------------------------- 9
7.4 Operating elements---------------------------------------------------------------------------------- 9
7.4.1 Weighing ------------------------------------------------------------------------------------------------------9
7.4.2 Taring -------------------------------------------------------------------------------------------------------- 10
7.4.3 Plus/Minus Weighings ----------------------------------------------------------------------------------- 10
7.4.4 Net-total weighings --------------------------------------------------------------------------------------- 10
7.4.5 Unit change------------------------------------------------------------------------------------------------- 11
7.5 Rear illuminated display -------------------------------------------------------------------------- 12
7.6 Calculator -------------------------------------------------------------------------------------------- 13
8 Maintenance, upkeep, disposal-----------------------------------------------------------13
8.1 Cleaning ---------------------------------------------------------------------------------------------- 13
8.2 Maintenance, upkeep ----------------------------------------------------------------------------- 13
8.3 Disposal ---------------------------------------------------------------------------------------------- 13
9 Troubleshooting -------------------------------------------------------------------------------
4 5
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CM-BA-e-0618

1 Technical data

KERN CM 60-2N CM150-1N CM 320-1N CM 1K1N
Readout (d) 0,01 g 0,1 g 0,1 g 1 g Weighing range (max) 60 g 150 g 320 g 1.000 g Taring range (subtractive) 60 g 150 g 320 g 1.000 g
Recommended adjusting weight, not included (class)
50 g
(M2)
100 g
(M3)
200 g
(M3)
1000 g
(M3)
Optimal temperature range 18 – 25 °C Units g / tol / tlt Permissible relative humidity < 85 %(non-condensing) Weighing plate mm 70 x 80 Size (B x H x T) mm 85 x 130 x 25
KERN CM 50-C2N CM 500-GN1
Readout (d) 0,01 ct 0,002 g 0,1 gn 0,01 g Weighing range (max) 50ct 10 g 500 gn 32 g Taring range (subtractive) 50ct 10 g 500 gn 32 g Test weight (included) 5 g (M1) 10 g (M2) Units ct / g g / gn Optimal temperature range 18 – 25 °C Permissible relative humidity < 85 % (non-condensing) Weighing plate mm 40 x 50 Size (B x H x T) mm 85 x 130 x 25
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2 Declaration of conformty

Declaration of Conformity
The electronic pocket balance
Type: KERN CM 60-2N
KERN CM 150-1N KERN CM 250-1N KERN CM 1K1N KERN CM 50-C2N KERN CM 500-GN1
correspond to the following EC requirements:
EC-EMC-directive version 89/336/EEC
Compatible norms are, in particular
Standards for electronic scale.
EN 61000-6-3 :2001 EN 61000-6-1 :2001 Standard for calculator : EN 55022 : 1998+A1 : 2000 EN 55024 : 1998+A1 : 2001
If a change is made to the above mentioned appliances without consulting KERN
this declaration will become invalid
Date: 01.10 2004 Signature: Gottl. KERN & Sohn GmbH Management
Gottl. KERN & Sohn GmbH, Ziegelei 1, 72336 Balingen-Frommern, Tel. 07433/9933-0, Fax 07433/9933-149
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CM-BA-e-0618

3 Fundamental information (general)

3.1 Intended use

The balance you have acquired serves to determine the weighing value of the mate­rial to be weighed. It is intended to be used as a “non-automatic“ balance, i.e. the material to be weighed is manually and carefully placed in the centre of the weighing plate. The weighing value can be read off after a stable weighing value has been ob­tained.

3.2 Inappropriate use

Do not use the balance for dynamic weighing. In the event that small quantities are removed or added to the material to be weighed, incorrect weighing results can be displayed due to the “stability compensation“ in the balance. (Example: Slowly drain­ing fluids from a container on the balance.) Do not leave a permanent load on the weighing plate. This can damage the measur­ing equipment. Be sure to avoid impact shock and overloading the balance in excess of the pre­scribed maximum load rating (max.), minus any possible tare weight that is already present. This could cause damage to the balance. Never operate the balance in hazardous locations. The series design is not explo­sion-proof. Structural alterations may not be made to the balance. This can lead to incorrect weighing results, faults concerning safety regulations as well as to destruction of the balance. The balance may only be used in compliance with the described guidelines. Varying areas of application/planned use must be approved by KERN in writing.

3.3 Guarantee

The guarantee is not valid following
non-observation of our guidelines in the operating instructions
use outside the described applications
alteration to or opening of the device
mechanical damage and damage caused by media, liquids
natural wear and tear
inappropriate erection or electric installation
overloading of the measuring equipment

3.4 Monitoring the test substances

The metrology features of the balance and any possible available adjusting weight must be checked at regular intervals within the scope of quality assurance. For this purpose, the answerable user must define a suitable interval as well as the nature and scope of this check. Information is available on KERN’s home page (www.kern-
sohn.com) with regard to the monitoring of balance test substances and the test
weights required for this. Test weights and balances can be adjusted quickly and at a reasonable price in KERN’s accredited DKD calibration laboratory (return to na­tional normal).
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4 Fundamental safety information

4.1 Observe the information in the operating instructions

Please read the operating instructions carefully before erecting and commissioning, even if you already have experience with KERN balances.

4.2 Staff training

The device may only be operated and looked after by trained members of staff.

5 Transport and storage

5.1 Acceptance check

Please check the packaging immediately upon delivery and the device during un­packing for any visible signs of external damage.

5.2 Packaging

Please retain all parts of the original packaging in case it should be necessary to re­turn items at any time. Only the original packaging should be used for return consignments.

6 Unpacking, installation and commissioning

6.1 Place of installation, place of use

The balance is constructed in such a way that reliable weighing results can be achieved under normal application conditions. By selecting the correct location for your balance, you will be able to work quickly and precisely.
Therefore please observe the following at the place of installation:
Place the balance on a firm, level surface;
Avoid extreme heat as well as temperature fluctuation caused by installing
next to a radiator or in the direct sunlight;
Protect the balance against direct draughts due to open windows and doors;
Avoid jarring during weighing;
Protect the balance against high humidity, vapours and dust;
Do not expose the device to extreme dampness for longer periods of time. In-
admissible bedewing (condensation of air moisture on the device) can occur if a cold device is taken into a significantly warmer environment. In this case, please acclimatise the device for approx. 2 hours at room temperature after it has been disconnected from the mains.
Avoid static charging of the material to be weighed, weighing container and windshield.
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CM-BA-e-0618
Major display deviations (incorrect weighing results, or a failure function of the calcu­lator) are possible if electromagnetic fields occur as well as due to static charging and instable power supply. It is then necessary to change the location.
If the calculator is interrupted by static charging, reset it to normal by pressing the “ON/AC” button.

6.2 Unpacking

Carefully remove the balance from its packaging, remove the plastic wrapping and position the balance in its intended working location.

6.2.1 Installation

Install the balance in such a fashion that the weighing plate is absolutely horizonta.

6.2.2 List of items supplied

Standard accessories:
Pocket balance
Batteries
Operating instructions
Test weight (only CM 5-C2N, CM 500-GN1)
Weighing container (only CM 50-C2N, CM 500-GN1)
Draft shield (only CM 50-C2N, CM 500-GN1)

6.3 Battery operation and change

Battery conservation through automatic power-off 3 –4 minutes after ending a
weighing operation.
When the battery power is used the display will show “LO”. Press the key and
change the batteries at once.
Battery change
1. Open the battery compartment cover located at the bottom of the balance (Unblocking battery
compartment cover ( picture 1+2).
2. Insert 2 AAA type batteries (picture 3) .
3. Re-insert and lock the battery cover.( picture 4).
When the balance is not in use for a longer period of time remove batteries and keep them separately. Leakage of battery liquid might damage the balance.
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6.4 Draft shield + weighing container (CM 50-C2N, CM 500-GN1)

6.5 Initial start-up

A warm-up time of 1 minutes stabilises the measured values after switching on. The accuracy of the balance depends on the local acceleration of the fall. Please be sure to observe the information in the chapter on adjusting.
Before weighing:
Put on Weighing pan
Unfold draft shield
Place the weighing material
on weighing plate.
put on draft shield.
After weighing:
Put Draft shield and weighing pan over weighing plate

6.6 Adjustment

As the acceleration value due to gravity is not the same at every location on earth, each balance must be coordinated – in compliance with the underlying physical weighing principle - to the existing acceleration due to gravity at its place of location ( only if the balance has not already been adjusted to the location in the factory). This adjustment process must be carried out during the initial start-up, after change in lo­cation and variation of surrounding temperature. It is also recommendable to adjust the balance periodically during weighing operation in order to obtain exact measured values.

6.7 Adjusting

Using a precision weight, the accuracy of the balance can be checked at any time and adjusted.
Adjustment procedure:
Check that the surrounding conditions are stable. A short warm-up time of about 1 minutes are recommended for stabilisation.
Press key approx. 3 seconds, ”CAL ” and then the exact weight of the adjusting
weight will appear the display.
Place the adjusting weight on the centre of the weighing plate.
F” will appear somewhat later, and then turn off. In case of an adjusting error or a wrong adjusting weight “ E” appears in the display.
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7 Operation

7.1 Overview of display CM 60-2N / CM 150-1N / CM 320-1N / CM 1K1N

(Units on display)

7.2 Overview of display CM 50-C2N

(Units on panel sheet)

7.3 Overview of display CM 500-GN1

(Units on panel sheet)

7.4 Operating elements

7.4.1 Weighing

Switch the balance on by pressing the
The balance will show “8888” for approx. 3 seconds and then change to “0”. Now it
is ready for use.
key.
Important: If the display does not show 0, press the key.
Only now (!) place object on the weighing pan. Make sure that the weighing object does not stripe or touch the housing or base.
If the object should be heavier than the weighing range allowance, the symbol “E”
(overload) will appear on the display .
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7.4.2 Taring

Switch the balance on by pressing the key, then wait for the “0” indication.
Place the tare cup on the weighing plate and press the key. Indication will go to
“0”. Now the weight of the cup is memorised internally.
Fill the object into the cup, read the measuring value.
By pressing the key after a weighing procedure, “0” will appear on the display
again. The taring procedure can be repeated continuously, for instance when mixing several components. The limit is reached when the full weighing range is overlay. After having removed the tare cup , the total weight will appear as a negative value.

7.4.3 Plus/Minus Weighings

For instance to control piece-weights. Switch the balance on by pressing the key, then wait until “0” is indicated.
Place rated weight on the weighing plate and tare on “0” by key. Remove rated
weight. Place the objects on the weighing pan successively, the balance will show any devia-
tion from the rated weight in “+” and “-“.
According to the same procedure packages with the same weight, related to a rated
weight, can be produced. Return to the weighing mode by pressing the key.

7.4.4 Net-total weighings

Useful when a mixture of several components will be weighed in a tare cup, and fi­nally the sum weight of all components weighed in will be needed for direction (net­total, i.e. without the weight of the tare cup).
Example:
Tare cup on weighing plate, tare on “0“ by pressing the key.
Weigh component n and tare back to “0” with the key. The activation of the
memory is shown by a triangle on the far left of the display.
Weigh component o, by pressing the key the net total is displayed, this means
the sum of component n and o. Tare to “0” by pressing the key.
Weigh component p, by pressing the key the net-total is displayed, this means the sum of the components n and o and p. If necessary fill the formula container up to the desirable level. To return to the weigh-
ing mode press the
10
key
CM-BA-e-0618

7.4.5 Unit change

Switch the balance on by pressing the key, then wait for the “0” indication.
The units set in the balance can be selected between the different units, by pressing
the key
Models: CM 60-2N / CM 150-1N / CM 320-1N / CM 1K1N
Display
Gramm * g 1
Tael Taiwan tlt 0.02667 Tola tol 0.08573 * Factory setting
Model: CM 50-C2N
Display
Conversion factor 1 g =
Conversion factor 1 g =
Gramm * g 1
Carat ct 5 * Factory setting
Model: CM 500-GN1
Display
Gramm * g 1
Grain gn 15.43236 * Factory setting
Conversion factor 1 g =
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7.5 Rear illuminated display

To choose the backlight mode, please follow the below instruction for the setting:
Turn off the balance.
Press and hold the key, then press the key one time; after that release the
key. Display shows„bl“.
Press the key to confirm the entry of the backlight mode.
Press the key to switch among the modes:
Display Mode Function
Contrasting display which
„bl“ on
Backlight on
can also be read in the dark.
„bl“ off
„bl“ Ch
Confirm with the key.
Backlight off Save the battery
Backlight switches auto­matically off 10 sec after stable indication
Save the battery
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7.6 Calculator

(not included in models CM50-C2N and CM500-GN1)
KERN CM Calculator
ON/AC Switch ON /All clear + Addition
- Subtraction ÷ Division x Multiplication = Result % Percent M + Memory plus M - Memory minus MC Memory clear MR Independent Memory recall +/- Sign change Square Root , Comma C Clear
Notice: Data exchange between balance and pocket calculator is not possible.

8 Maintenance, upkeep, disposal

8.1 Cleaning

Please disconnect the device from the operating voltage before cleaning.
Only use a cloth dampened with mild suds and not aggressive cleaning agents (sol­vents or similar). Please ensure that fluids are not able to get into the device and rub off using a clean, soft cloth. Loose sample residue/powder can be removed carefully using a brush or hand vac­uum cleaner.
Remove any spilt material to be weighed immediately.

8.2 Maintenance, upkeep

The device may only be opened by trained service engineers authorised by KERN.

8.3 Disposal

The operating company shall dispose of the packaging and the device in compliance with the valid national or regional law of the operating location.
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9 Troubleshooting

The balance should be switched off for a short time following an interruption in the programme sequence . It is then necessary to repeat the weighing process from the beginning.
Help:
Interruption Possible cause
Weight display is not illuminated.
The weight display changes continu­ally
The weighing result is obviously in­correct
The balance is not switched on.
The batteries are wrongly inserted, the
batteries are empty
No batteries are attached
Draught/air movement
Table/floor vibrations
The weighing plate is in contact with for-
eign matter.
Electromagnetic fields / static charging (choose different location/switch off inter­fering device if possible)
The balance display is not set to zero
Adjustment is no longer correct.
Switch the balance off if other error messages should appear and then switch on again. Contact the manufacturer if the error message does not disappear.
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Great fluctuations in temperature.
Electromagnetic fields / static charging
(choose different location/switch off inter­fering device if possible)
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