KERN RFS Instruction Manual
KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
email: info@kern-sohn.com
Instruction Manual
Price computing scales
KERN RFS
Version 1.0
01/2011
GB
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
RFS-BA-e-1110
GB
KERN RFS
Version 1.0 01/2011
Instruction Manual
Price computing scales
Contents
1 TECHNICAL DATA............................................................................................. 4
2 APPLIANCE OVERVIEW ................................................................................... 5
2.1 Overview of display.................................................................................................................. 6
2.2 Keyboard overview................................................................................................................... 7
3 BASIC INFORMATION (GENERAL) .................................................................. 9
3.1 Proper use................................................................................................................................. 9
3.2 Improper Use ............................................................................................................................ 9
3.3 Warranty .................................................................................................................................... 9
3.4 Monitoring of Test Resources................................................................................................. 9
4 BASIC SAFETY PRECAUTIONS ..................................................................... 10
4.1 Pay attention to the instructions in the Operation Manual ................................................ 10
4.2 Personnel training.................................................................................................................. 10
5 TRANSPORTATION & STORAGE................................................................... 10
5.1 Testing upon acceptance ...................................................................................................... 10
5.2 Packaging................................................................................................................................ 10
6 UNPACKING, SETUP AND COMMISSIONING ............................................... 10
6.1 Installation Site, Location of Use.......................................................................................... 10
6.2 Unpacking / Scope of delivery .............................................................................................. 11
6.3 Assembly post-mounted display.......................................................................................... 11
6.4 Mains connection ................................................................................................................... 12
6.5 Battery power supply............................................................................................................. 12
6.6 Initial Commissioning ............................................................................................................ 12
6.7 Adjustment.............................................................................................................................. 13
6.8 Verification .............................................................................................................................. 15
6.8.1 Position of seals and adjusting switch ................................................................................. 16
6.9 Checking the balance verification settings ......................................................................... 16
6.9.1 Service mode ....................................................................................................................... 17
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7 BASIC OPERATION......................................................................................... 20
7.1 Switching on/off ..................................................................................................................... 20
7.2 Zeroing .................................................................................................................................... 20
7.3 Taring....................................................................................................................................... 20
7.4 Overload warning ................................................................................................................... 20
8 WEIGHING WITH PRICE DETERMINATION ................................................... 21
8.1 Basic price entry via keyboard ............................................................................................. 21
8.2 Memory for basic price (PLU = Price look up)..................................................................... 22
8.2.1 Direct PLU 1∼PLU 28“.......................................................................................................... 22
8.2.2 Indirect PLU 1∼PLU 99“ ....................................................................................................... 24
8.3 Totalization.............................................................................................................................. 27
9 ADDITIONAL USEFUL FUNCTIONS ............................................................... 30
9.1 AUTO CLEAR .......................................................................................................................... 30
9.2 Display background illumination.......................................................................................... 30
9.3 How to set date/time for sales receipt.................................................................................. 31
10 PRINTER „SALES RECEIPT“ ...................................................................... 32
10.1 Printout examples .................................................................................................................. 32
10.2 Change paper roll ................................................................................................................... 33
11 DATA OUTPUT RS 232C.............................................................................. 34
11.1 Technical data......................................................................................................................... 34
11.2 Pin allocation of the balance output socket (front view) ................................................... 34
12 SERVICE, MAINTENANCE, DISPOSAL, ERROR MESSAGES .................. 34
12.1 Cleaning .................................................................................................................................. 34
12.2 Service, maintenance............................................................................................................. 34
12.3 Disposal................................................................................................................................... 34
12.4 Error messages ...................................................................................................................... 34
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1 Technical data
KERN RFS 6K2HM RFS 15K5HM RFS 30K10HM
Weighing range (max) 6 kg 15 kg 30 kg
Readability (d) 2 g 5 g 10 g
Minimum load 40 g 100 g 200 g
Verification value 2 g 5 g 10 g
Verification class III III III
Reproducibility 2 g 5 g 10 g
Linearity ± 4 g ± 10 g ± 20 g
Stabilization time 3 s 3 s 3 s
Recommended adjusting
weight (not supplied)
Warming up time
(operating temperature)
6 kg (M2) 15 kg (M2) 30 kg (M1)
10 min
Net weight (kg) 7 kg
Dimensions of the housing
(B x D x H)
370 x 310 x 125
Weighing plate, stainless
steel
Tripod height
370 x 240 mm
47 cm
Weighing unit €/kg; €/100 g
Permissible ambient
condition
-10° C to 40° C
Allowable air humidity 0 % - 85 % (non-condensing)
Electric Supply
Rechargeable battery
Operating period without printer – background lighting on 30 h
Line adapter 230 V AC, 50/60 Hz
Weighing balance 9 V DC, 800mA
6 V, 10 Ah
Operating period without printer – background lighting off 80 h
Loading time approx. 12 hrs.
Data interface RS 232C
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2 Appliance overview
RFS-BA-e-1110
1. PLU direct price keys
2. Bubble level
3. Post-mounted display
4. Battery compartment underneath weighing pan
5. Printer „Sales receipt“
6. Numeric keys
7. RS 232 interface
8. Levelling screw
9. ON/OFF switch
10. Mains adapter connection
5
2.1 Overview of display
Weight Basic price
Sales price
Display weight:
Here, the weight of your goods is displayed.
The arrows above the symbols show:
a
NET
Zeroing display
Stability display
Net weight
Display basic price:
Enter your basic price here either in €/kg or €/100 g using the keyboard, switching
between €/kg or €/100 g possible.
The arrows above the symbols show:
AUTO CLEAR
Set basic price is deleted automatically
when balance is unloaded
€/kg Basic price in €/kg
€/100 g Basic price in €/100 g
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Display sale price:
Here the sales price is displayed in Euro [€].
The arrows above the symbols show:
+
TOTAL
Data in summation memory
Total
Battery very low
2.2 Keyboard overview
1 2
1. Bubble level
Level balance with foot screws until the air bubble of the
water balance is in the prescribed circle.
2. Storage battery status display
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Selection Function
∼
∼
• Numeric keys, input basic price/PLU
• Display „End total“
• Delete key
• PLU direct price keys for 28 frequently reoccurring item
prices, see chpt. 8.2.1
• Saving and retrieving item prices (indirect PLU), see
chpt. 8.2.2
• Addition in total memory
• Taring key
• Save settings
• Zeroing key
• Back to weighing mode
• Set basic price is deleted automatically when balance is
unloaded
• Switch-over key €/kg or €/100 g
• Issue to external device
• Line advance “sales receipt”
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3 Basic Information (General)
3.1 Proper use
The balance acquired by you serves to determine weight and price. 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. As soon as the goods to be
weighed are placed on the balance and the basic price has been set the price is
calculated automatically and displayed.
3.2 Improper Use
Do not use balance for dynamic weighings. 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 permanent load on the weighing plate. 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 faults and destruction 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
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.
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4 Basic Safety Precautions
4.1 Pay attention to the instructions in the Operation Manual
Carefully read this operation manual 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 Transportation & 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
Keep all parts of the original packaging in case you need to return the appliance.
Only use original packaging for returning. Before sending, disconnect all connected
cables and loose/movable parts. Attach possibly existing transport safeguards.
Secure all parts, e.g. weighing plate, power unit etc., to prevent slipping and damage.
6 Unpacking, Setup and Commissioning
6.1 Installation Site, Location of Use
The balances are 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 (condensation 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.
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.
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6.2 Unpacking / Scope of delivery
Carefully remove the balance from the packaging, remove plastic cover and setup
balance at the intended workstation.
Serial accessories:
• Balance, see chpt. 2
• Mains power supply
• Rechargeable battery
• Instruction Manual
6.3 Assembly post-mounted display
[1]
[2]
[3]
[4]
Plug tripod [1] of the post-mounted display into the provided support [2] of the
balance. Fix by using the two supplied screws [3] and [4]. Ensure that the interior
cable does not get damaged or trapped.
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