Table of Contents
Advertisement
E range
8.3
Power Settings & Adjustment
The furnace control system incorporates electronic power limiting. The power limit parameter
OP.Hi is accessible to the operator, and must be used to match the furnace to the actual supply
voltage. All models covered by this manual are fitted with either 104V or 208V elements and are
designed for use over the range of voltages 100V -110V or 200V-240V, the power limit parameter
is set accordingly. These models may be relocated safely to a different voltage within the range.
Note also that the E-range furnaces are designed for optimal temperature control in the range
500°C to 1200°C. Below this temperature range some temperature instability may be observed
and the controller may overshoot its set point temperature by more than 20°C. Temperature
stability and setpoint temperature overshoot can be improved by setting a suitably small ramp rate
and/or reducing the power limit setting for OP.Hi.
The power limit settings for OP.Hi depending on the voltages and temperature ranges are given in
Table 8-4.
Table 8-4. Power setting OP.Hi for actual electrical power supply voltage.
Supply Voltage
OP.Hi Setting
for500°C to 1200°C
OP.Hi Setting for
100°C to 550°C
Power Adjustment -Set the Heater Switch to Off to prevent heating while adjusting the power
limit. Refer to the separate controller manual supplied with this furnace to alter the value of
OP.Hi to the correct value as shown in
value). Note if a too high a setting is made for a given voltage then this could result in the
elements burning out, or a fuse could blow.
9
SPECIFICATIONS
-Carbolite reserves the right to change specifications without notice.
9.1
Models covered by this manual
EHA/EST models – horizontal single-zone tube furnaces with controls in integral base.
EVA/EVT models – vertical single-zone tube furnaces with controls in separate base.
EHC/EZS models – horizontal 3-zone tube furnaces with controls in integral base.
EVC/EVZ models – vertical 3-zone tube furnaces with controls in separate base.
EST/EVT/EZS/EVZ models – are of a split tube furnace design.
All models have cylindrical elements with wire formed in the surface of the insulation material.
All models can accept work tubes up to a maximum outside diameter of 60mm.
All models have a maximum operating temperature of 1200°C (1100° continuous).
Model names are of the type "EHA 12/300B" where 300 is the heated length. Sizes range from
150-600mm heated length (EHA/EVA/EST/EVT) or 450- 600mm (EHC/EVC/EZS/EVZ).
Work tube adaptors, extended work tube supports, insulation plugs, and gas/vacuum end seals are
available from Carbolite for work tubes with outside diameters of 32mm, 46mm and 60mm.
24
100V
104V
100
100
33
33
Table 9-1. Recommended work tube lengths.
Heated
Max.
Length(mm)
Power(W)
150
750
300
1480
450
2000
600
2540
MF65-1.01
110V
200V
208V
93
100
100
31
33
33
Table
, (it is good practice to write down the original
8-4
Standard work
tube length
work tube
(mm)
length (mm)
300
450
600
750
220V
230V
93
85
31
28
Extended
600
750
900
1050
240V
78
26
Hide quick links:
Advertisement
Table of Contents
