Intelligent Weighing Technology GM-3000, GM-6000, GM-30K, GM-15K, GM-1100 Operation Manual

GM SERIES

ELECTRONIC WEIGHING SCALE

OPERATION MANUAL

PLEASE READ THIS MANUAL VERY CAREFULLY

BEFORE ATTEMPT TO OPERATE THE SCALE

AUGUST 1999 REV 2

Specifications subject to change without prior

notice

CONTENTS

1. INTRODUCTION

2. INSTALLATION

3. EXPLANATIONS

4. OPERATIONS

5. CALIBRATION

6. CARE AND MAINTENANCE

7. WARRANTY

1. INTRODUCTION

Congratulation for choosing an excellent
digital weighing scale.

Reliable and accurate, the GM series is ideal
for supermarkets, grocery stores, food service
shops, or retail stores.

The GM series has been designed to be
easy-to-use, durable, and portable, with an
standard sealed type rechargeable battery and
matching AC adaptor rear display and
back-lighting capabilities are available as
option.

1.1 Models & Specifications:

Model Capacity Increment Accuracy
GM-3000 3000g 1g
GM-6000 6000g 2g 1/3000
GM-15K 15kg 0.005kg
GM-30K 30kg 0.01kg

GM-1100 1100g 0.1g 1/11000
GM-11K 11kg 1g

Power
Consumption

AC/DC(rechargeable battery)

6V

operated DC, 40mA/hr

Packing
Weight

N. WT. 3.5kg G. WT. 4.5kg

Tare range Full capacity
AC adaptor Input: AC 110/220V +/- 10%,

50-60Hz Output:DC9V/500mA

Option 1. Rear side display

2. Back-lighting facility

3. Leveling facility

4. RS-232C/ Printer Interface

Operating
Temperature

00C ~ 400C(32 ~ 1040F)

2. INSTALLATION

2.1 Unpacking:

Unpacking the scale carefully, within this
package you will find:

a. This manual
b. The GM scale
c. The platter
d. The adaptor(9V/500mA)
e. The dust cover
NOTE: Do not dispose of the box or packing

materials, since they may be useful in the
future when long-range transportation is

called for.

2.2 Optimal installation requirements:

For optimal results we recommend that you
install the scale at a location that provides
for the following:

a. A level surface
b. Stable and/ or not subject to vibration
c. Not exposed to direct sunlight
d. Away from areas containing corrosive gas
f. Dust-free

f. Temperature 00C – 400C
g. Humidity < 95% RH (Do not install near a

humidifier)

h. Away from other electronic equipment to

avoid interference. If a leveling bubble
is included, center the bubble with the
leveling feet before using the GM scale.
Follow the precautions outlined below on
the safe use of electrical power sources.
Connect the GM to the local power source
and charge the battery completely, while
the display is switched off. Be sure that
the scale is safely out of the way while
it is charging.

2.3 Precautions:

Warning!! Do not attempt any troubleshooting

or maintenance other than that mentioned in
this manual.
Do not open the scale enclosure for any reason,
and expose the delicate electronic components.
NOTE:
Refer all servicing to qualified personnel at
an authorized dealership only. Otherwise, the

warranty may be invalidated.

Safe use of Power Sources:

Check that the voltage requirement for the AC
adaptor are provided, but not exceeded, by the
local power supply.
Insert the adaptor plugs securely into a power
socket first, then the receptacle on the
right-bottom side of the scale.
Avoid connecting other equipment to the same
socket. Secure the adaptor cord such that it
will not be stepped on or pulled, if possible.
If an extension cord must be used, it should
have a equal to or exceeding that of a suitable
power source.

3. EXPLANATION

3.1 Keypads & Displays:

1. OFF KEY

Press this key to turn scale off.

2. ON/ZERO KEY

Press this key to turn scale on or set weight
to zero when unloaded.

3. TARE KEY

Press this key to tare off the weight of
a container.

4. MODE KEY

Press this key to switch among metric and
avoirdupois weight units with or without

backlight (optional).

5. LO-BAT INDICATOR

When this indicator appears:

a. For dry battery version: replace the

batteries with new ones, or apply the power
adaptor immediately.

CAUTION:

When the power adaptor is being used, take
out all the batteries from the battery pack.
Fail to do so may cause battery
leak/explosion or damages to the scale.

b. For built-in rechargeable battery version:

Apply the power adaptor and recharge the
scale immediately. Fail to do so may cause
unrecoverable damages to the rechargeable
battery inside scale.

6. TARE INDICATOR

An arrow will appear and point at this sign
to indicate the tare function is in
operation and weight displayed is net
weight.

7. ZERO INDICATOR

An arrow will appear and point at this sign
to indicate a zero weight status.

IN-CHARGE INDICATOR (BUILT -IN RECHARGEABLE
BATTERY VERSION)

This indicator is located at the left-hand
side of the scale. Charging status IS
displayed by different colors:

Red: Recharging battery
Green: Charging completed

4. OPERATIONS

4.1 Routine operation:

a. Switch power on. The unit will begin a
self-testing sequence. The scale is ready for
use when the display zeros. The measuring unit
for the weighing value will be in kilograms
initially.
b. Press the “ MODE” key to select the desired

measuring unit.(kilograms or pounds)
c. If there is a container placed on the platter,

press “ TARE” key to subtract the weight of the
container previously.

d. Start to weight.

* Optional back-lighting facility

Press “ MODE” key, there are 4 modes to be switch
over in sequence.(kilograms without
back-light ---> pounds without back-light --->
kilograms with back-light---> pounds with

back-light)

4.2 Operation notes:

Grounding:

Ground the instrument properly to protect the
instrumentation from power surges. This can
be done by using a suitable adaptor transformer
with a third ground terminal. Any method of
grounding should comply with local electrical
regulations. Do not ground the GM to gas pipes,
water pipes, or to telephone plugs.

Warm-up period

For best results, a minimum 10-minute period
of disuse prior to operation is highly
recommended.

Enabling and disabling the Auto shut-off
mechanism

When the scale is turn on, the auto shut-off
mechanism is set at four minutes. To disable
or to enable again this power-saving function,
follow these instructions:
a. Press the “OFF” key.
b. Press and hold the “TARE” key.
c. Press the “ON/ZERO” key, the display will

show “F1”.

d. Press “ TARE” key to switch the display to

“F4”. Then press “MODE” key, the display
will read “4-OFF” or “0-OFF”.

e. Press the “ MODE” key to switch between the

two modes.

f. Press “ON/ZERO” to reset the scale for

normal operation.

Handling the scale

Despite the sturdy appearance of the scale,
each unit houses sensitive instrumentation
which may be damaged by careless handling of
the scale. Use both hands when transporting
the scale with at least one hand under the scale.
(This will be routinely required if the
charging site for the rechargeable battery is
not the same as the operation location.)

Placing a load

Always place a commodity gently on the platter.
Sudden shocks will damage the weighing sensor
irreparably. Careful attention to avoiding
shocks will extend the life of the sensor.
For best results, do not leave loads on the
platter for prolonged periods, as this may
impair the functioning of the weighing sensor,
afterwards.

Handling the plug

Disconnect the cord by the pulling on the plugs
only, never the cord itself.

Exposure to liquids

Only clean the scale in a manner prescribed
by the instructions below.
Should water or another liquid seep into the
enclosure, unplug the unit and have it checked
by your qualified personnel before operating
it any further.
Care should be taken when drinking beverages
near the scale, and when placing beverage
containers on or near the scale.

Thunderstorms

The GM is equipped with a lightning protection
circuit which can prevent about 90% of the

damage typica lly caused by lightning. The
effectiveness of the circuit depends on how
well grounding the instrument is.
However, during severe electrical storms it
is strongly advisable that the scale be
switched off and that the adaptor be completely
disconnected from the local power source.

Long-term storage

Charge the battery fully for an uninterrupted
eight hours. Be sure that there are no load
left on the platter. Clean and cover the scale.

5. CARE AND MAINTENANCE

a. Do not subject the commodity platter to

sudden shocks.

b. Clean the cover and commodity platter with

a soft damp cloth and mild detergent. Do
not sue harsh abrasives.

c. Do not submerge the scale in water and do

not pour splash or spray water directly on
it.

d. Do not use acetone or other volatile

solvents for cleaning.

e. In order to prolong the battery life, please

refrain from using any longer before

recharging when (low battery sign)
appears.