Specifications

ManualsBrandsCDA ManualsOvenSV 150L

675-110306

1-1

Section 1

FURNACE EQUIPMENT

1.1 Furnace Description

The LA-306 is a compact, near-infrared, conveyor belt furnace for laboratory and general purpose thermal

processing in the range of 100-980 ⁰C in a controlled atmosphere, free of outside contamination. Process gas

may be CDA, N

or another inert gas. Dual gas furnaces may use Nitrogen and a second gas such as Forming

Gas (pre-mixed N

) or another type of reducing gas injected into the heating chamber.

Figure 1-1 Furnace Front Elevation

The LA-306 furnace transports product on a 150 mm (6-inch)

wide belt. In the standard design the chamber clearance above

the belt is 50 mm (2 inches). Optionally the furnace can be

ordered with 25 mm (1-inch) or 100 mm (4-inch) vertical

clearance above belt. LA-306 furnaces feature a hermetically

sealed heating chamber permitting control of the furnace

chamber process environment. Baffle sections before and after

the heating section contain curtains that hang down to just above

the belt to further isolate the furnace chamber from the room

atmosphere and from the cooling section.

The LA-306 can process substrates, wafers, PCBs, metal,

ceramic, glass or polycarbonate parts for electronic package

sealing, thermo-setting polymer curing, reflow soldering,

hybrid/thick film firing, brazing, annealing, tempering and metal

sintering applications, or almost any kind of general thermal

processing requiring precision temperature control in a

controlled atmosphere environment.

Figure 1-2 Furnace Entrance Elevation

Summary of content (12 pages)

PAGE 1
Section 1 FURNACE EQUIPMENT 1.1 Furnace Description The LA-306 is a compact, near-infrared, conveyor belt furnace for laboratory and general purpose thermal processing in the range of 100-980 ⁰C in a controlled atmosphere, free of outside contamination. Process gas may be CDA, N2 or another inert gas. Dual gas furnaces may use Nitrogen and a second gas such as Forming Gas (pre-mixed N2/H2) or another type of reducing gas injected into the heating chamber.
PAGE 2
Section 1 1.
PAGE 3
Equipment Description Figure 1-7 Rear Elevation Figure 1-8 Top Front View 676-110306 1-3
PAGE 4
Section 1 1.3 Furnace Elements 1.3.1 Furnace Arrangement Parts are carried from the load station through the heating and cooling sections of the furnace to the unload station on a 152 mm (6-inch) wide belt driven by an adjustable speed motor. Maximum vertical parts clearance inside the furnace is 50 mm (2 inches).
PAGE 5
Equipment Description 1.3.3 Entrance Baffle and Exhaust Stack The entrance baffle isolates the heating section from the ambient air outside the furnace entrance. It is housed in a welded stainless steel shell lined with ceramic fiber insulation. An N2 or CDA gas curtain and a series of hanging stainless steel baffle plates serve to act as a thermal barrier as well as purge the baffle and block ambient air from entering the furnace.
PAGE 6
Section 1 Zones. The heating chamber is partitioned into 3 separate zones using ceramic fiber dividers. The dividers are designed with the smallest possible opening consistent with the part parts clearance specifications. This partitioning assures very high thermal isolation between zones. Although the heating profile across the belt is extremely uniform, heat losses through the furnace side walls and at the belt edge supports produce a temperature drop near the edges of the transport belt.
PAGE 7
Equipment Description 1.3.8 Cabinet Fans Cabinet Fan. The furnace is equipped with one (1) 10-inch diameter fan mounted on the underside of the top of the furnace cabinet. This fan exhausts heat emitted from the outside of the furnace chamber and cooling tunnel into the room or customer installed exhaust system. Enclosure Fan. The control enclosure is cooled by fan(s) mounted under the enclosure. These fans pull cool air from the room into the enclosure through vents in the enclosure base.
PAGE 8
Section 1 1.4.2 POWER Panel A. MAIN POWER lamp When this WHITE light is ON, the furnace is connected to the power line. B. CONTROLS pushbuttons with indicator Pressing the green switch applies power to the furnace controls, belt motor and cooling fans. Pressing the red switch shuts off power to the furnace and acts electrically in the same way as pushing an EMO button. Figure 1-13 Power Panel Controls Between the switches is an indicator light that stays ON while the control system is ON. C.
PAGE 9
Equipment Description 1.4.4 TEMPERATURE Panel Figure 1-15 Zone Temperature Controllers The temperature control for each zone’s heating elements is by a digital single-loop PID controller with loop Autotune and 3 alarm functions. The controller’s closed loop temperature control system uses K-type thermocouples for feedback and is preprogrammed to provide excellent furnace performance.
PAGE 10
Section 1 1.4.5 STATUS Panel A. READY lamp When all zones have heated to their SV setpoint values and the controllers have reported all PV process temperatures as within temperature deviation limits, the process READY light (green) on the STATUS panel will turn ON. The furnace is then ready to process parts. B. ALARMS When lighted, these red LED indicators show what condition caused the alert or alarm.
PAGE 11
Equipment Description 1.4.6 GAS FLOW CONTROL Panel Atmosphere control is accomplished manually with flowmeters calibrated in liters per minute. The meters are arranged to control gas flow into the various parts of the furnace and to control gas flow out the exhaust stack to achieve overall gas flow balance within the furnace.
PAGE 12
Section 1 1.4.7 TEST Panel A. CALIBRATE pushbutton with lamp Whenever the LAMPS button is on, this button applies 25% power directly to the lamps selected on the ENERGIZE LAMPS panel, allowing a reliable check for failed lamps on the TOP LAMP STRINGS and BOTTOM LAMP STRINGS indicators, or to adjust the SCR line voltage settings during SCR maintenance.