Gemlab F-series Muffle Furnace (Model M76-1700, M76-1800)
| Gemlab's Model M76-1700 ("MAXXI MUFFLE") vertical muffle furnace of unparallel technology combined with superior longevity and incredible versatility designed by Ted Themelis for flawless performance. The furnace is able for heat-treating between 1800 to 3,000 cts of rubies-sapphires in air, reducing, oxidizing or in vacuum, with or without addtives at temperature from 1200oC to 1700oC (1200oC-1800oC for model M76-1800). |
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Model M76 consists of:
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Four integrated modules (Power, Furnace, tmep.control, atmosphere control) |
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Three associated systems (muffle, water recirculating, vacuum) |
Main features
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Semi-floor model 800 (D) x880 (W) x 1100 (H) mm |
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Weighs 108 kgs |
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Oper. temp.1200oC to 17000C (air); 1200oC to 1525oC (vacuum using full muffle) |
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Double steel shell design with dual air cooling fans |
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Full atmosphere control for reducing-oxizing |
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Vacuum pump with valve and vacuum gauge |
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Re circulating water cooling module |
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Power: 2.2 KVA, 220 Vac 20 A outlet (1 phase) |
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Economical power consumption, only 1870 watts needed to maintain operating temp. at 1700oC |
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Up gradable for 1800oC operation |
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Safe
and easy operation |
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Long-lasting
performance |
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Delivery 6-8 weeks, FOB Bangkok |
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One
year warranty on all electric, electronic parts |
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Power module |
Furnace Module |
Temp. Control Module |
Atmo. Control Module |
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Power isolated transformer |
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Elevator assembly with controls (Up, Down, Stop, speed control) |
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Incoming power voltmeter and ammeter shown the power consumption |
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Mains (208-230 VAC, 20A, 1 phase) and breaker circuit |
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1900-grade fiberboard insulation |
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Molybdenum disilicide 1800-grade heating elements |
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Port for muffle and elevator assemblies |
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Elevator assembly with controls (Up, Down, Stop, speed control) |
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Artificial intelligent main temperature programmer-controller with 51-segments and accuracy +/- 1oC. |
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Artificial intelligent temperature limit contrroller accuracy +/- 1oC with single set alram point in the event the main process is failed |
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B-type thermocouple (2 sets) |
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SCR (Silicon Conrol Rectifier), controller and Trigger for power control managment |
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Instrumentation: Hourmeter shown heatng element consumption hours, start, stop emegency bottons, on-off switch, analog ammeter, analog volmeter |
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One-way gas valves |
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Pressure gasregulators |
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Pressure gauges |
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Gas mixer |
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on-off valves |
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150 mm flowmeters |
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Hoses inlet, exhaust |
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| Configuration of heating your stones |
Heating without Muffle Tube
By removing the muffle tube and inserting special ceramic plugs, the furnace is converted to a bottom or top-loaded furnace allowing to increase the load of the gemstones by 30% to be heated. |
Heating with Full Muffle Tube
Model M76 uses full muffle tube, OBE (Open-Both-Ends), OD= 76.2 mm, L=610 mm or optimum performance where precise control of the atmosphere conditions or vacuum is required. The crucible may be loaded in the chambers from the top, or bottom using the electric elevator |
Heating with Half Muffle Tube
Half-muffle tube, COE (Close-One-End), OD= 76.2 mm, L=305 mm. may also be used where atmosphere conditions with positive pressure, or vacuum are needed. The crucible is loaded in the chambers from the top or bottom using the electric elevator.
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Different modes of loading the crucible to heat-treat your gems (Model M76) |
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OPTION B.
FULL MUFFLE
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OPTION C.
TOP HALF-MUFFLE
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OPTION D.
BOTTOM HALF-MUFFLE
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Top/bottom loading |
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Slow cooling |
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With/without additives |
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Air onlyvacuum |
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No vacuum |
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Load: One cylindrical straight crucible
(OD=70mm, H=95 mm) |
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Top/bottom loading |
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Slow or rapid cooling |
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With/without additives |
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Oxidizing, reducing |
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Vacuum operation |
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Load: One cylindrical straight crucible
(OD=60 mm, H=95 mm) |
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Top loading |
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Slow cooling |
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With/without additives |
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Oxidizing, reducing |
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Vacuum operation |
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Load: One cylindrical straight crucible
(OD=60 mm, H=95 mm) |
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Bottom loading |
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Slow or rapid cooling |
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With/without additives |
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Oxidizing, reducing |
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Vacuum operation |
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Load: One cylindrical straight crucible
(OD=60 mm, H=95 mm |
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Standard items included in Model M76-1700
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1800-grade MoSi2 heating elements (4 pcs) |
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Vacuum pump (3.6 m3/h, 5 Pa, 150 W), gauge, and vacuum hose |
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B-type thermocouple (2 sets) |
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One set of flange sealing hermetically the muffle ceramic tube at the top and one set at bottom |
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Atmosphere control module with two 150 mm flow flow-tubes for purging directly into the muffle oxygen, nitrogen or mixture of hydrogen-nitrogen or oxygen/nitrogen at fully controllable atmosphere conditions |
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Crucible, disk, plugs, other ceramics |
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Muffle ceramic tube: One half (OD=50 mm, L=305 mm and one full (OD=50 mm, L=610m) |
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UPGRADING TO 1800oC (MODEL F-M76-1800
Gemlab's furnace Model M76-1700 has been designed and engineered to be easily converted for 1800oC furnace temperature opeavertical muffle furnace upon reconfiguration of the following:
1) Change to 1900-grade Kanthal heating elements
2) Change B-type to 20/40-type thermocouple
3) Change parameters in the existing temp.controller
Al other parts (insulation, etc) remained unchanged
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Standard package (Model M76-1800)
Order: Model M76-1800 as per above specs with M76-1700 but supplied with 1900-grade elements, one 20/40 type and one B-type thermocouple. This a complete package with full options included.
Delivery: FOB Bangkok Thailand, 6-8 weeks |
Comparison features between all Gemlab models, setting up heat-treatment facility and consumable required |
