KERN & SOHN EMB 500-1BE User Manual
KERN & Sohn GmbH
Ziegelei 1
E-Mail: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Internet: www.kern-sohn.com
Operating instructions
Density Scale
KERN EMB-V
Version 2.2
08/2014
GB
D-72336 Balingen
Fax: +49-[0]7433-9933-149
EMB-V-BA-e-1422
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GB
KERN EMB-V
Density Scale
Version 2.2 08/2014
Operating instructi ons
Contents
1 Technical data ................................................................................................ 4
2 Appliance overview ....................................................................................... 5
2.1 KERN EMB 200-3V with installed density kit KERN YDB-01 ...................................... 6
2.2 KERN EMB 2000-2V with installed density kit KERN YDB-02 .................................... 7
2.3 Keyboard overview .................................................................................................... 8
2.3.1 Numeric entry ............................................................................................................................. 8
3 Basic Information (Gen eral) .......................................................................... 9
3.1 Proper use ................................................................................................................. 9
3.2 Improper Use ............................................................................................................. 9
3.3 Warranty .................................................................................................................... 9
3.4 Monitoring of Test Resources ...................................................................................10
4 Basic Safety Precauti o ns ............................................................................ 10
4.1 Pay attention to the instructions in the Operation Manual .........................................10
4.2 Personnel training .....................................................................................................10
5 Transport and storage ................................................................................. 10
5.1 Testing upon acceptance ..........................................................................................10
5.2 Packaging / return transport ......................................................................................10
6 Unpacking, Setup and Commissioning ..................................................... 11
6.1 Installation Site, Location of Use ...............................................................................11
6.2 Unpacking, Scope of delivery ....................................................................................11
6.3 Mains connection ......................................................................................................12
6.4 Battery operation (optional) .......................................................................................12
6.5 Initial Commissioning ................................................................................................12
6.6 Adjustment ................................................................................................................13
7 Basic Operation ........................................................................................... 15
8 Density determination ................................................................................. 17
8.1 Principle of Density Determination ............................................................................17
8.1.1 Influencing magnitudes and error sources ............................................................................... 18
8.2 Density determination of solids .................................................................................19
8.2.1 Density determination while using the density kits KERN YDB-01 or YDB-02 ....................... 19
8.2.2 Density determination using the suspended weighing device ................................................. 23
8.2.3 Density determination of solid material with a density of less than 1 g/cm3 ............................. 26
8.3 Determining density of liquids ...................................................................................28
8.3.1 Density determination while using the density kits KERN YDB-01 or YDB-02. ...................... 28
8.3.2 Density determination us in g the suspended weighing device ................................................. 30
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9 Preconditions for Precise Measurements ................................................. 33
9.1 Calculation of Results ...............................................................................................33
9.2 Influence Factors for Measurement Errors ................................................................33
9.2.1 Air bubbles ................................................................................................................................ 33
9.2.2 Solid body sample .................................................................................................................... 33
9.2.3 Liquids ...................................................................................................................................... 34
9.2.4 Surface ..................................................................................................................................... 34
9.2.5 Sinker for density determination of liquids................................................................................ 34
9.3 General information ..................................................................................................34
9.3.1 Density / Relative Density......................................................................................................... 34
9.3.2 Drift of Balance Display ............................................................................................................ 34
10 Density Table for Fluids .............................................................................. 35
11 Uncertainty of Measurement for Density Determination of Solids .......... 36
12 User Instructions ......................................................................................... 37
13 Menu ............................................................................................................. 38
13.1 Navigat ion in the menu .............................................................................................38
13.2 Menu overview ..........................................................................................................39
13.3 Desc r ipt ion of individual menu items .........................................................................40
13.4 Interface parameters .................................................................................................43
14 Data output RS 232 C .................................................................................. 44
15 Service, maintenance, disposal .................................................................. 46
15.1 Clean ........................................................................................................................46
15.2 Ser vice, m aint enance ...............................................................................................46
15.3 Disposal ....................................................................................................................46
16 Instant help ................................................................................................... 47
17 Declaration of Conformity ........................................................................... 48
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1 Technical data
(F1)
(F1)
Operating time: 12 h
(With battery operation)
KERN EMB 200-3V EMB 2000-2V
Readability (d) 0.001 g 0.01
Weighing range (max) 200 g 2000 g
Reproducibility 0.002 g 0.02
Linearity ± 0.005 g ± 0.05 g
Recommended adjustment
weight, not added (class)
Stabilization time (typical) 2.5 sec
Warm-up tim e 2 h
Unit g
Operating temperature +5°C… +35°C
Humidity of air max. 80 % (not condensing)
Housing (B x D x H) mm 170 x 240 x 53
Net weight 0.8 kg
Weighing plate mm Ø 82 Ø 150
Battery operation (optional)
Mains adapter 300 mA / 9V
200 g
9V block
2000 g
AUTO-OFF-function
Underfloor weighing Standard hooks
Interface RS-232 standard
3 min.
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2 Appliance overview
bottom side
KERN EMB 200-3V
KERN EMB 2000-2V
Weighing pan
Display
Keyboard
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RS 232
Battery compartment
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Underfloor weighing
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6
2.1 KERN EMB 200-3V with installed density kit KERN YDB-01
Upper sample dish of the immersion basket
Weighing plate "density kit"
Beaker
Lower sample dish of the immersion basket
Platform
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2.2 KERN EMB 2000-2V with installed density kit KERN YDB-02
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Upper sample dish of the immersion basket
Beaker
Lower sample dish of the immersion basket
Platform
Weighing plate "density kit"
8
2.3 Keyboard overview
Key
Function
Key Function
• Turn on/off
• Calculate weighing data via interface
• Menu access (longer pressing of the button)
• Cancel process/input
• Density determination mode to switch over to weighing mode
• Numeric input / dialing digits to the right
• Taring / Setting to zero
• Confirm
• Save and exit menu
• Adjustment menu access (longer pressing of the button)
• Density determination access mod e for soli ds
• Scroll backwards in menu
• Density determination access mod e for liquids
• Scroll forward in menu
• Weighing in a ir
• Weighing in liquid
2.3.1 Numeric entry
Dialing the digits to the right, each active site flashes.
Each time you press the button, the numerical value of the
flashing digit increases.
Confirm entry
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3 Basic Information (General)
3.1 Proper use
The scale purchased by you is intended to determine the density of solids and
liquids. The determination of the density is based on the Archimedean Principle, see
chapter 8.1.
Furthermore, the scale can also be used to determine the weighing value of the
weighing object. 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
pan. As soon as a stable weighing value is reached the weighing value can be read.
3.2 Improper Use
• Do not use balance for dynamic add-on weighing procedures, if small amounts of
goods to be weighed are removed or added. The “stability compensation“
installed in the balance may result in displaying an incorrect measuring value!
(Example: Slowly draining fluids from a container on the balance.)
• Do not leave permanent load on the weighing pan. This may damage the
measuring system.
• Impacts and overloading exceeding the stated maximum load (max) of the
balance, minus a possibly existing tare load, must be strictly avoided. Balance
may be damage by this.
• Never operate balance in explosive environment. The serial version is not
explosion protected.
• The structure of the balance may not be modified. This may lead to incorrect
weighing results, safety-related faul ts and des tr uct ion of the balance.
• The balance may only be used according to the described conditions. Other areas
of use must be released by KERN in writing.
3.3 Warranty
Warranty claims shall be voided in case
• Our conditions in the operation manual are ignored
• The appliance is used outside the described uses
• The appliance is modified or opened
• Mechanical damage or damage by media, liquids, natural wear and tear
• The appliance is improperly set up or incorrectly electrically connected
• The measuring system is overloaded
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3.4 Monitoring of Test Resources
In the framework of quality assurance the measuring-related properties of the
balance and, if applicable, the testing weight, must be checked regularly. The
responsible user must define a suitable interval as well as type and scope of this test.
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. In
KERN's accredited DKD calibration laboratory test weights and balances may be
calibrated (return to the national standard) fast and at moderate cost.
4 Basic Safety Precautions
4.1 Pay attention to the instructions in the Operation Manual
Carefully read this oper ati on ma nual before setup and
commissioning, even if you are already familiar with KERN
balances.
4.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
5 T ransport and storage
5.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
5.2 Packaging / return transport
Keep all parts of the original packaging for a possibly
required return.
Only use original packaging for returning.
Prior to dispatch disconnect all cables and remove
loose/mobile parts.
Reattach possibly supplied transport securing devices.
Secure all parts such as the weighing platform, power unit
etc. against shifting and damage.
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6 Unpacking, Setup and Commi s si oning
• Balance, see chap. 2.0
6.1 Installation Site, Location of Use
The balance is designed in a way that reliable weighing results are achieved in
common conditions of use.
You will work accurately and fast, if you select the right location for your balance.
On the installation site observe the following:
• 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.
Non-permitted condensation (co ndensation of air humidity on the appliance)
may occur if a cold appliance is taken to a considerably warmer environment.
In this case, acclimatize the disconnected appliance for ca. 2 hours at room
temperature.
• Avoid static charge of goods to be weighed or weighing container.
• Do not operate in areas with hazard of explosive material or in potentially
explosive atmospheres due to materials such as gasses, steams, mists or
dusts.
• Keep away chemicals (such as liquids or gasses), which could attack and
damage the balance inside or from outside.
• If electro-magnetic fields or static charge occur, or if the power supply is
unstable major deviations on the display (incorrect weighing results) are
possible. In that case, the location must be changed.
6.2 Unpacking, Scope of delivery
Remove balance and accessories carefully from packaging, remove packaging
material and place device at the planned work place. Verify that there has been no
damage and that all packing items are present.
Scope of delivery / serial accessories:
• Mains adapter
• Flush-mounted hook
• Operating instructions
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6.3 Mains connection
„AF on“:
In order to save the battery, the balance switches automatically
off after 3 minutes without weighing.
„AF off“:
Switch-off function deactivated.
Power is supplied via the external mains adapter. The stated voltage value must be
the same as the local voltage.
Only use original KERN mains adapters. Using other makes requires consent by
KERN.
6.4 Battery operation (optional)
Remove the battery compartment cover on the underside of the scale and connect a
9 V block battery. Replace the battery compartment cover.
For battery operation the balance has an automatic switch-off function which can be
activated or deactivated in the menu (chapter 13).
In the weighing mode, press and hold longer until [Pr] is displayed.
Press repeatedly until "AF" appears.
Acknowledge with .
Use now to select between the following two settings:
Acknowledge selection by . The balance returns to weighing mode.
If the batteries are run down, "LO" appears in the display. Press ON/OFF-key and
replace the batteries immediately.
If the balance is not used for a longer time, take out the batteries and store them
separately. Leaking battery liquid could damage the balance.
6.5 Initial Commissioning
A warming up time of 2 hours after switching on stabilizes the measuring values.
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter “Adjustment”.
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6.6 Adjustment
display shows the exact size of the adjustment weight (See chapter 13.3).
As the acceleration value due to gravity is not the same at every locati on on ear th ,
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 for the first commissioning, after each
change of location as well as in case of fluctuating environment temperature. To
receive accurate measuring values it is also recommended to adjust the balance
periodically in weighing operation.
+ Prepare the required adjustment weight.
The adjustment should be made with the recommended adjustment weight
(see chap. 1 "Technical data"). Adjustment is also possible with the weights
of other nominal values (see table 13.3), but not the optimum for measuring
technique.
+ Observe stable environmental conditions.
+ A warming up time (see chapter 1) is required for stabilization.
+ Ensure that there are no objects on the weighing pan.
Procedure:
EMB 200-3V as an example.
1. Start balance by pressing .
2. Press and hold down longer, the display shows "CAL" briefly. Then the
3. During this display, set the adjustment weight in the middle of the weighing
plate
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4. Press , short time later there appears „CAL F“, then the automatic return
An error during adjustment or the use of an incorrect adjusting weight will result
exactness is recommended for quality-relevant applications.
to the weighing mode. In the display there appears the value of the adjustment
weight.
in an error message „CAL E“. Repeat adjustment.
Keep the adjustment close to the balance. Daily control of the weighing
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7 Basic Operation
EMB 200-3V as an example.
Start-up
Switching Off
Press the ON/OFF key.
The balance will carry out a self-test As soon as the
weight display appears, the balance is ready for
weighing.
Press ON/OFF button, the display disapp ear s
Weighing
Place goods to be weighed on balance.
Wait for stability display [g]
Read weighing result.
If the weighing object is heavier than the weighing range, the
display shows the error message "E".
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