| HC |
Hermetic Chamber. Adds sealed lamp-end plenums, plumbing and flowmeters necessary to operate the furnace at the lowest level of oxygen
(O2) or moisture contamination from ambient air. During operation, process gas, under flow meter control, is fed to the plenum boxes under pressure
to prevent ambient air from entering the furnace chamber through the lamp seals. Chamber gaseous contamination levels can be held typically to ≤20
ppm. This option, when utilized with nitrogen (N2) or forming gas (N2/H2 mix) process atmospheres prevents the oxidation of metal surfaces during
processing. The option must be ordered before NO, HO, OSS,
OA or MA
options can be included. Option available on most furnaces.  |
| HD |
Hydrogen Detection. Combustible gas detectors mounted at entrance, exit and in control enclosures detect and alarm in the presence of
hydrogen above safe concentrations. Integrated with the furnace software for emergency purge and shutoff in the event of an alarm . Option, required
with HO and HO/NMH.
|
| HO |
Hydrogen Operation. Electro-mechanical control of the atmosphere required for hydrogen (H2) operation with more than 5% H2 concentration.
The H2 cycle includes a nitrogen (N2) chamber purge and provides power to H2 igniter coils on exhaust stacks at the entrance and exit of the heating
chamber. Included is fail-safe automatic N2 purge, and audio and visual alarms in the event of a failure of an igniter coil, or loss of N2 or H2
pressure. Includes special H2 valve and controls enclosure with constant N2 purge. Control circuitry visibly indicates the gas or gases flowing
to the process and all alarm conditions. All curtain, eductor and cooling gas is N2. Requires HO/HNM
option with enclosure and HD option. Also requires IPS, HC,
OSS and OA
options. Optional on some furnaces. |
| HO/NHM |
Hydrogen Operation-Nitrogen Hydrogen Mixing. Provides the facility to mix hydrogen and nitrogen using furnace controls as well as
the ability to vary the nitrogen/hydrogen ratio along the length of the furnace. A single mix switch allows gas to flow through both the nitrogen
and the hydrogen flowmeters and allows different zones to receive gas with different N2/H2 ratios. Includes HO option. Requires HD option. Also requires IPS,
HC, OSS and
OA options. Optional on some furnaces.
|
| HSK |
Handshake Signaling. NO and NC signals to upstream and downstream equipment or to the production line controller about the furnace status
when the furnace is part of an automatic production line. Requires LT
option. Option available on all furnaces.
|
| HT |
High Temperature Operation. High temperature construction for furnace operation above 500°C up to 1000°C. Includes upgraded insulation
and materials, changes BSS 316 stainless steel belt to BNV Nichrome material, and adds cabinet temperature thermocouple plus alert/alarm on cabinet
temperature. Option available on most furnaces. |
| IE |
Intermediate Exhaust Eductor. An exhaust stack with eductor that is located between selected chambers to increase control of process
gas flow, to promote isolation of specific furnace chambers and to evacuate volatile emissions off-gassed from product. Standard on some furnaces.
 |
| IPS |
Inlet Pressure Switch. Pressure switch upstream of the gas distribution system that signals the operator and the furnace control system
in the event of pressure loss in the process gas supply line. Furnace PROCESS START mode will be inhibited automatically until pressure is restored
to normal. Option available on most furnaces.
|
| IR-E |
Interface Roller, Entrance. Small diameter belt rollers at the entrance of the furnace that permit close transfer of parts from upstream
conveyor equipment. The rollers are less than 3 inches (76.2 mm) in diameter. Adds 6.4 cm (2.5 inch) to the length of the furnace. Option available
on most furnaces. |
| IR-X |
Interface Roller, Exit: Small diameter belt rollers at the exit of the furnace that permit close transfer of parts to downstream conveyor
equipment. The rollers will be less than 3 inches (76.2 mm) in diameter. Adds 6.4 cm (2.5 inch) to the length of the furnace. Option available
on most furnaces. |
