|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. Allows for dual gas operation for efficient use of primary process gas (Gas 1) in the furnace, minimizing consumption with a second gas for cooling and evacuation (Gas 2). Gas 1 is supplied only to oxygen-controlled process areas (heating chamber), while Gas 2 is supplied to entrance and exit baffles, transition tunnels, lamp plenums, eductors and cooling. Common Process Gas combinations include:|
Gas 1: FG Gas 2: N2
Note this is similar to NO Operation except primary gas is only supplied to the furnace chamber. Order with 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: SCR, HC option and EH option.
|FM||Independent Zone Flow Control. Process Gas is controlled by variable rate flowmeters 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). Atmosphere shall be controlled by manually adjustment of the flowmeters. 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.|
|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.|