U
P
CERAMICS AND GRAPHITE CRUCIBLES
MELTING FURNACE MANUAL
CAUTIONS
1.1 General safety information for the use of electrical
devices:
To avoid injury from or electric shock,please ensure
compliance with safety instructions when using this
device.Please read the instruction Carefully and make
sure that you have understood it well,keep the manual
near the equipment to be able to read it at any time.AIways
use current sources co- nnected to the ground and
providing the necessary voltage (indicated on the label on
the device).If you have any doubt,let an electricien check
that unit is propetly grounded.Never use a damaged power
cable.Do not open the unit of solar radiation.Use the
device in a protected location to avoid damaging the
equipment or endangering others.Make sure the device is
able to cool after 3 hours constant working and avoid
placing it too close to other devices that produce
heat.Before cleaning.disconnect it.Use a soft damp cloth
for cleaning.Avoid using detrgent and make sure that no
liquid enters the unit.If the metal contains acid or alkali
materials,which may have chemical reaction to corrode
heating elementin this way.please keep the top cover open
during melting process. No internal element of this device
needs to be maintained by the user. An opening of the
device without our approval leads to a loss of warranty.
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2.TECHNICAL PARAMETERS
1.2 General safety information for the use of melting
furnaces:
●The user manual should be kept close to the device
and should always be accessible for the users. Instruct
your employees how to use the melting furnace
properly.
● Make sure your working area is well aerated.
● Keep the escape routes clear.
● Keep a fire extinguisher ready for use.
● Always use safety gloves.
●Do not place melting furnaces on combustible
supports or close to combustible materials.
●Do not let the device be without surveillance during
the heating.
●Do not overfill the crucible,in order to prevent it from
overflow during the heating.
●Add solid melting materials by inserting it slowly into
the hot liquid mass.
1.3: Specific safety information for the use of melting
furnaces:
●In order to ensure a long durability and a good
function of your device,
we strongly advice to work less than 3 hours
once.Please ensure to
stop for 30 mins after 2 hours of continuous work.
●Periodically check the intactness of the crucible,to
avoid damages of the heating coil.
●The maximal operating temperature tolerated by the
melting furnace is 1100C， Never exceed this value.
●Recycled gold or sliver contain acid and alkali which
may corrode the heating element.If you want to melt
that kind of metals,please open the cover of the melting
chamber with regularity to let the toxic substance
evaporate.
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Model
GF1100ND
GF1150ND
Power input
1800
1800
Power supply
60Hz/7A
50Hz/7A
Max Heating temperature
1150℃
1150℃
Measurement accuracy
±0.5%FS
±0.5%FS
Working environment
0-50C/30-85%RH
0-50C/30-85%RH
Working environment
212.76cm'
212.76cm'
External dimensions of
the crucible(cm)
Diameter:7.2
Height:15.5
Internal dimensions of the
crucible(cm)
Diameter:4.4
Height:14
Dimeniions (cm)(L*W*H)
24* 21* 38
25*24*37.5
Shipping
dimensions(L*W*H
31*30*42.5
38*31*42.5
Weight(kg)
8
8.5
Shipping weight (kg)
9
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3.BASIC PRINCIPLE OF OPERATION
Control system:the PID
The PID module has two functions:to measure and to
control the heating.
The temperature measurement in the heating coil is made
at regular intervals.
The information is transmittde to the PID module as
current value.If the
current value is inferior to the set value,the PID module
makes the device
heat.If the current value is superior or equal to the set
value,the PID mo-
dule stops the heating.
This cycle gets repeated at a 2-second-
interall.Therefore,a high grade
of precision is ensurde.
The advantages of the PID module in comparison to a
normal thermostat.
are the flexibility.the efficiency and the precision.
Thus,.the energy consumption can be optimizde,and the
material fatigue
can be compensated:Therefore.
How does the metal get molten?
The PID module controls the power flow to the heating
coi(ON/OFF sys-
tem).When the circuit is closed,the heating coil gets warm
and transfers
the heat to the crucible which forwards the warmth to the
metal(passive
heating without direct contact).The metal gets hot and
liquid when it re-
aches its smelting point.
2.1 Content of delivery:
6
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Please consider that the crucible shouldn' t be
completely filled to reach an optimal result.If you
overfill the crucible,the device won' t be able to produce
the heat needed to let the metal melt.Moreover,the
melting process often produces vapors. If you overfill
the crucible,it can lead to overpressure and the use of
the device gets dangerous for the user,at the latest by
opening the cover.
Please buy an adapted crucible to melt other metals
Always inform yourself about the production of vapors
during the melting process to check the compatibility of
the device with your intentions.
5.INSTRUCTIONS FOR METALS MELTING
IMPORTANT:The graphite crucible is only adapted
to melt gold, Silver,copper and other sev noble metals!
5.1 List of the metal types which can be molten in the
crucible provided with the device:
4.OPERATION
temperature control function
1. The temperature on the display is the actual temperature
inside the furnace.
2. Press the key U, the temperature number under the display will flash.
When flashing, it means the temperature can be set.
3. Press the key to adjust the required temperature
Short press the number will progressive increase by 1 degree,
long press the number will speedily increase
Short press the number will progressive decrease by 1 degree,
long press the number will speedily decrease.
4. Press the key P to confirm the setting temperature.
5. On the display, the symbol means heating and insulation.
On the display, the symbol flashing means increasing the temperature.
Below the display, the symbol flashing means the holding temperature.
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2.Take off the protecting sleeve,Then take off the screws on
the furnace body here.There are also screws here,take off
them,then you can take out the flange.
3.After take out the
flange,you can take out the
furnace chamber,here is the
furnace without furnace
chamber.
4.Take off the broken heating coil and winding a new
heating coil on the furnace chamber. Don' t forget the
insulating rod! This is the finished furnace chamber with
heating coil.
6.HOW TO EXCHANGE THE HEAT ING COIL
6.1 CAUTION:Never open the device without authorization
of your seller.This can lead to a loss of warranty!
6.2 he heating coil may get damaged,and you have to
exchange it.To do it,please follow these given instructions.
一 、Check the function of the heating coil
1.First open the bottom of the furmace.
2.Check the resistance of the heating coil like this:If
110V,the resistance is about 8？. If 220V,the resi-
tance is about 30？ .I1 the resistance is infinite,that
means the heating coill is broken,then you need to
change a heating coil.
二 、 Exchange
1. Take off the screws here.
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