|FCA||Additional Furnace Chamber. Adds one heating chamber with lamp elements in the top and bottom rows. Adds 0.762 m (30 inches) to length of furnace. Option available on most furnaces.|
|FGO||Forming Gas Operation (now called DGO or Dual Gas Operation). Allows for dual gas operation for efficient use of primary process gas (Gas 2) in the furnace, minimizing consumption with a second gas for cooling and evacuation (Gas 1). Gas 2 is supplied only to oxygen-controlled process areas (heating chamber), while Gas 1 is supplied to entrance and exit baffles, transition tunnels, lamp plenums, eductors and cooling. Common Process Gas combinations include:|
Gas 1: N2 Gas 2: FG
Note this is similar to NO Operation except with FGO supplies GAS 2, primary gas is only supplied to the furnace chamber. Requires HC, standard on some furnaces, option available on most furnaces.
|FHS||Furnace Heating Section. The heating section shall be comprised of 30 inch (76 cm) long chambers; each chamber shall be partitioned into temperature controlled zones using ceramic dividers. The dividers shall be configured with the smallest possible opening that can be made to be consistent with the parts clearance specifications to assure very high thermal isolation between the zones. Chambers. Each chamber shall be contained within a stainless steel shell lined with ceramic fiber insulation. Gas introduced into a plenum between the shell and the porous insulation shall be heated as it passes through the insulation to enter the chamber at chamber temperature. This method of gas distribution shall not affect the temperature profile, shall assist in keeping the interior of the furnace clean and shall speed the cool down process when the lamps are turned off. |
Control Zones. The interior of the furnace chamber shall be partitioned into controlled zones using ceramic dividers. The dividers shall be designed with the smallest possible opening that can be made to be consistent with the parts clearance specifications to assure very high thermal isolation between the zones. Each zone shall have its own thermocouple connected to the control system.
IR Lamps. Within each zone, an arrdocmay of tungsten filament, halogen gas quartz lamps shall be located above (in dryers) or both above and below (in furnaces) the transport belt. These lamps shall generate near-wave IR light at a color temperature of approximately 2500K (peak wavelength centered at 1.16μm) with most IR power delivered throughout the chamber in wavelengths of 0.5-3μm. The lamps, producing up to 100 watts per inch, shall be capable of heating the furnace chamber interior to a state of equilibrium within minutes. Standard on all furnaces.
See also: HC option and EH option.
|FM||Independent Zone Flow Control. Process gas is controlled by variable rate flowmeters. Atmosphere shall be controlled by manually adjustment of the flowmeters.|
On larger furnaces the flowmeters are enclosed behind a clear panel. Panel access can be restricted by one of three methods: Keyed lock, mechanical latch or fastened by screws (lock and latch shall both be provided).
On LA-306 furnaces and "V" models, flowmeters are mounted on the face of the control panel.
Standard on all furnaces.
|FZN||Furnace Control Zone. Adds additional control zone in an existing furnace or dryer chamber. Additional zone is integrated with the OI. Standard on –X models. Option available on most furnaces.|
|GSM||Supply Gas Mixing system. Adds two (2) 0-3600 psi regulators, pressure gauges, valves and flowmeters to allow direct connection of two (2) heating chamber process gases. Facilitates easy manual switching between the two gases. Used with dual gas option. |
Typical configuration includes Nitrogen connected to GAS1 port and Forming Gas connected to GAS2 port. GAS1 is supplied to entire furnace, but can be blocked from heating chambers to allow GAS2 supply to heating chambers only.
Commonly used on alloy annealing operations and thick film firing where presence of copper or other oxidizing elements require use both GAS1 (furnace aux) and GAS2 (heating chamber) in the furnace. Shut off or reduce flow of GAS2 to reduced operating cost on processes where reducing gas is not required like pure gold or platinum annealing or basic thick film firing applications without copper. Option available on most furnaces.
|GUIDE||Roller bearings and belt serving as a belt guide at entrance and exit. Standard on most furnaces.|
|GUIDES||Manually adjustable product guides at takeoff end of the furnace to align product boats to for transfer to the shuttle pickup mechanism. When used with the SMEMA option, the software can be set to prevent unused lanes from adversely interfering with the line operation. Option available with SMEMA option.|
= Standard equipment = Optional equipment