Gram FV 220 User manual

SERIES
FV
120 / 120C / 220 / 220C
OPERATION MANUAL

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INDEX English
Introduction 3
Installation 4
Unpacking 4
Specifications 4
Environmental requiremens 5
Setting up the balance 6
Using the balance 6
Basic weighing 6
Count weighing 7
Percent Deviation 8
Display and keyboard 8
Display symbols 9
Calibration 9
Auto-calibration (For models FV-120C and FV-220C) 10
Manual calibration (For models FV-120 and FV-220) 10
Parameters setting 12
Parameters index 13
RS-232 interface 14
Transmission Format 14
Data output mode 14
Auto Output Mode 14
Command Output Mode 15
External commands 16
Connection of balance and external device 17
Trouble shooting 17
Care and maintenance 19
Cleaning 19
Guarantee 20

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ENGLISH
INTRODUCTION
To insure a proper operation of the balance, please read this manual
completely before you start to use your balance.
The analytical balances are the latest products of years of research, design,
development and infield testing. Every balance incorporated with the
advanced electromagnetic force sensor technology, mechanical engineering
and software technology offers the following features:
• Easy to operate and read results from a clear big LCD with a white backlight.
• Rapid weighing speed is 10 times faster than mechanical balances.
• Able to tare up to the maximum capacity of the balance.
• Multiple weighing modes can be selected.
1. Normal weighing.
2. Piece counting.
3. Percentage weighing.
• Multiple weighing units conversion such as g and ct as standard units
and the extra weighing units popularly used in some countries can be
put into the balance on customer´s request.
• A standard RS-232 interface for connecting peripheral device such as a
computer or a printer.
• Dysfunction alarm.
• Easy to calibrate the balance.
• Display separate from body.

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INSTALLATION
Unpacking
CAUTION: Handle with care all time!
Remove the balance from the carton carefully with the following items:
Packing List
• 1 Main body of the balance.
• 1 Pan.
• 1 Pan support.
• 1 AC power adapter.
• 1 User.
• 1 Standard weight (F1 Class).
• 1 Display.
It is recommended to save the cartons and packing materials for storing and
transporting the balance or returning it for services.
SPECIFICATIONS
MODEL FV-120 FV-220 FV-120C FV-220C
Capacity 120g 220g 120g 210g
Readability 0,1 mg
Repeatability 0,1 mg
Linearity 0,2 mg

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Four-corner 0,2 mg
Stabilization time About 5 sec.
Sensitivity 2 ppm
Calibration External Automatic internal
Operating temperature 20 - 25 ºC
Pan size 90 mm
Dimensions 320 x 300 x 470 mm
Power AC 110V-230V 50Hz-60Hz
ENVIRONMENTAL REQUIREMENS
As a precision instrument, the analytical balance requires an environment
which is free from excessive air flow, corrosive, vibration and temperature
or humidity extremes.The mentioned factors will affect displayed weighing
readings.
• Keep weighing ambient clean and dry all time;
• The best operating temperature is about 20ºC / 68ºF at about 50%
relative humidity.
• Use a stable AC main.
• Don´t place the balance:
– In direct sunshine.
– Next to open windows or a door causing draft or rapid temperature
charges.
– Near heater or air conditioner.
– Near vibrating, rotating or reciprocating equipment.
– Near magnetic field or equipment which generates magnetic field.
– On an unstable weighing table.
– In areas where the danger of explosion exists.

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SETTING UP THE BALANCE
Warm up the unplugged balance at an indoor temperature for two hours
whenever moved it from a colder place, otherwise the accuracy will be
affected by condensation of in side and surface of the balance.
• Place the balance on a stable and level work surface.
• Level the balance by turning the adjusting feet, checking the level
indicator on the balance,until the bubble appears in the center of the
circle.
• Put the parts of the balance as following sequence: dust guard, draft
ring, pan support and pan.
• Plug in the AC adaptor.
• Check if the adaptor does match your main supply before plug in.
USING THE BALANCE
Note: To avoid dust, keep your balance door closed whenever it is not
continually used.
Plug in and pre-warm your balance at least 30 minutes before weighing.
Basic weighing
1. Plug in the power, the balance will automatically proceed system
initialization and display status of off.
2. Press the key, the balance will display 0.0000g.

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3. Place the container on the weighing pan.
4. Press the key.
5. Place the sample object in the container and close the doors.
6. Read out the value after display is stable.
7. Repeat the steps to weigh next object.
Count weighing
To decide the total number of the components of similar weights, first get the
weight of a known number of the components as a reference, then we could
get the average weight of the component. Then the amount of the components
on the pan will be decided.
1. First set the sample components quantity refer PARAMETER SETTING (for
example, if the amount of sample is 50 pcs, you should setup the C2-2).
2. Press the key, the balance will display 0.0000g.
3. Press the key, till the balance will display PCS mode.
4. Place the sample on the pan, then press the key, the balance will read the
amount number of the samples. The unit displayed on the LCD display is PCS.
5. Add the sample components you want, you could read the value when [O]
is on the display.
6. Press the key to convert between counting mode and other mode.
PCS indicates piece number.
Note: The sample value should not be less than readability value.

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Percent Deviation
To calculate the percentage a weight varies from a reference:
• Keep the pan empty.
• Press the key to zero the display.
• Put a weight or an object on the centre of the pan as the reference sample
and close the doors.
• Press the key, 100% will be displayed.
• Remove the weight or the object from the pan.
• Put the object to be compared on the centre of the pan and close the doors.
• A value of the deviation between reference and comparison will be displayed.
• Press the key to convert between percent mode and other mode. %
indicates percent weighing
DISPLAY AND KEYBOARD

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Display symbols
gGram
ct Carat
lb Pound
oz Ounce
pcs Piece counting mode
%Percentage mode
♀Stable indicator
Positive indicator
Negative indicator
Waiting indicator
CAL in Status of calibration
CAL dn Loading the weights
CAL… Calibrating
CAL up Unloading weights
CAL-no No calibration
CAL end Calibration over
E Over the capacity
EUnder the capacity
--------- key valid
. Reading data
SAVE --- Saving
S---END Saving end
CALIBRATION
The analytical balance is designed on the equilibrium principle of electronic
magnetic force. Among the various factors that may affect the accuracy of
balance, gravity is the most obvious one. In different areas, there is different
gravity, which results in different display value. We can remove this error by

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calibrating the balance. That means whenever we move a balance from one
area to another, we have to put a standard calibration weight (100.0000g
for example) on the weighing pan and tell the balance here this weight is
100.0000g. Please make it as a reference to other weighings. This is the
calibration of balance.
There are two ways to calibrate the analytical balance.
Auto-calibration (For models FV-120C and FV-220C)
• Plug in and pre-warm the balance at least 30 minutes.
• Turn on the balance.
• The balance will be calibrated automatically after several minutes and
whenever the environment temperature changes out of a definite limit
over 2ºC or it Works out of the time limit over two hours.
Note: If “CAL-no” is displayed:
• Check if there is any object on the pan or the build-in calibration weight is
loaded down onto the weighing mechanism while calibration.
• Remove the objects from the pan or raise up the build-in calibration weight
from the weighing mechanism.
• Press the key then key to raise the build-in calibration weight
up when it is on the weighing mechanism.
Manual calibration (For models FV-120 and FV-220)
In this mode, the parameter should be set to C1-01.