Versitile Infrared Thermal Processing Furnace

The LA-309N is a low cost general purpose furnace for dental production applications. Nitrogen process atmosphere is controlled much like a clean room: pressurized nitrogen gas is pushed through the heating chamber insulation providing a pre-heated, laminar flow for a uniform, stable atmosphere. Precise temperature is maintained by control thermocouples above the belt in each zone quickly sensing changing conditions. IR quartz heating lamps inside the chamber instantaneously adjust their output to achieve tight temperature control: each load through the furnace sees the same temperature.

Computer Controlled. The furnace is operated via ProControl software installed on a robust managed platform RAID1 furnace computer.  The process engineer can easily vary process parameters using the sophisticated PID and power control parameters in the software. An almost infinite number of recipes and profiles can be labeled and stored for ready access on the furnace computer.  The software includes 2 levels of password protected control (Engineer and Operator) and logs each change in recipe load or furnace state useful for troubleshooting product and process performance.

The furnace software operates on a Microsoft Windows 7 Professional computer system.  The program and all settings and recipes are stored on the RAID1 dual mirrored redundant hard drives.  The computer is complete with 17" LCD 1280x1024 high resolution color graphic screen, full size keyboard/mouse interface and both Ethernet and wireless-N high-speed network connections to facilitate view and control of the furnace by managers and process engineers from any location. The furnace includes four (4) local USB ports (two at entrance and two on the LCD monitor at the control panel) for connecting profilers and jump drive storage devices.

Laboratory and Production Applications. The LA-309N is an efficient tool for many dental production and laboratiory uses. With its tight temparature control and nitrogen controlled atmosphere, it can process substrates, wafers, metal, ceramic, glass,  or polycarbonate parts for dental bonding, epoxy and polymer curing, thick film firing, ceramic bonding, as well as titanium and porcelain veneering, general thermal processing and metal brazing, annealing, tempering and sintering applications. Its performance characteristics are ideal for laboratory work or production applications where consistency and repeatablility are important.  Rapid startup and response to recipe changes make it uniquely qualified for development work and applications where a number of processes are run.

Furnace Arrangement

Parameter LA-309NLA-309XN
Load Station 38 cm (15 inches)38 cm (15 inches)
Entrance Isolation Baffle with Venturi Exhaust38 cm (15 inches)38 cm (15 inches)
IR Heating Chamber, Zone 119 cm (7.5 inches)19 cm (7.5 inches)
IR Heating Chamber Zone 238 cm (15 inches)19 cm (7.5 inches)
IR Heating Chamber Zone 319 cm (7.5 inches)19 cm (7.5 inches)
IR Heating Chamber Zone 4none19 cm (7.5 inches)
Transition Tunnel with Venturi Exhaust38 cm (15 inches)38 cm (15 inches)
CACT Closed Atmosphere Cooling Chamber76 cm (30 inches)76 cm (30 inches)
Unload Station38 cm (15 inches)38 cm (15 inches)

Furnace Specifications for LA-309N Models

DATASHEET:   Datasheet pdf

Parameter LA-309NLA-309XN
Process Gas  Nitrogen
Control Zones3 zones 4 zones
Heating Chamber length76 cm (30 inches)76 cm (30 inches)
Cooling ChamberCACT – N2 convective and radiant cooling, exterior fan heat removal.
Belt Speed25-500 mm/min (1-20 ipm) or 50-1000 mm/min (2-40) ipm (other speeds available)
Conveyor BeltBNV- low mass, stabilized Nichrome-V
Belt Size, nominal width 24 cm (9.5 in.)24 cm (9.5 in.)
Exhaust Improved venturi exhaust stacks to reduce process gas consumption.  Number of stacks vary with process requirements.
Temperature Capacity, max 1000C
ElectricalAll models include universal transformers which accommodate 208-480 Vac and 50/60 Hz frequency anywhere in the world, allowing furnace relocation without external equipment. All furnace systems are phase balanced to improve facility efficiency. IR lamp controls automatically keep IR spectrum constant.

Facility Requirements

Parameter LA-309N & LA-309XNMaximumTypical Operating @ 850 C
Power 208 Vac, 3 ph,  60 Hz
220-240 Vac, 3 ph,  50/60 Hz
380 Vac, 3 ph,  50/60 Hz
400-415 Vac, 3 ph,  50/60 Hz
440-500 Vac, 3 ph,  50/60 Hz
25.7 kW, 71 A
27.3 kW, 71.6 A
19.4 kW, 29.5 A
22.3 kW, 31.0 A
26.2 kW, 30.3 A
13.1 kW, 36.4 A
13.9 kW, 36.5 A
10.0 kW, 15.2 A
11.4 kW, 15.9 A
13.4 kW, 15.4 A
ParameterProcess SectionTypical (exchange rate 2.0x)
850 C with balanced flow
Typical (exchange rate 2.6x)
850 C & 25 Lpm excess for Low O2
Process Gas SupplyNitrogen357 sLpm @ 5 bar
(756 scfh @ 70 psig)
169 sLpm @ 5 bar
(358 scfh @ 70 psig)
Process Gas ExhaustNitrogen357 sLpm
(756 scfh)
169 sLpm
(358 scfh)
Enclosure VentilationFurnace Cabinet Fan (1)
vent to room or facility exhaust system
930 m3/hr @ 30C
(550 cfm @ 86F)
Control Cabinet Fans (2)
(vents to room)
360 m3/hr @ 30C
(212 cfm @ 86F)

Length3.1 m (122 inches)
Width0.94 m (37 inches)
Height1.71 m (67 inches)
Adjustable Conveyor Height91.44 cm +/- 3.8 (36 inch +/- 1.5)91.44 cm (36 inch)
Weight730 kg (1600 LB)

LA-309N Furnace Standard Features and Options

Standard OEM features are listed on the Standard Features pages (see link below). Popular options include the following:

Code DescriptionCode DescriptionCode Description
EMElement Monitoring SystemOAOxygen AnalyzerAFRCoalescing Air Filter & Regulator
MAMoisture AnalyzerEHEdge HeatersIR-EEntrance Interface Roller, small diameter
LTProcess Ready Light TowerCBCircuit BreakerIR-XExit Interface Roller, small diameter