Gemlab F-series Box Muffle Furnace (Model MB-1700, MB-1800)
Model MB-1700 (vetical muffle attached)
 |
1 KVA, plugs to any 220 Vac 10 A outlet (1 phase) |
|
Upgradable for 1800oC operation |
|
Very low power consumption, only 700 watts needed to maintain operating temp. at 1700oC |
|
Safe
and easy operation |
|
Long-lasting
performance |
|
One
year warranty on all electric, electronic parts |
|
Gemlab's model MB-1700 is a feather-weight, desktop furnace occupying minimum work space and it is the most economical furnace designed by Ted Themelis. The furnace employes muffle attachment of unparallel versatilty and impeccable design of its class not found anywhere in the industry. Depending on the configuration mode up to 2,500 carats of rubies, yellow, pink sapphires, and other gemstones may be heat-treated between 1200oC to 1700oC (1200oC to 1800oC for modeL MB-1800) in oxidizing environment (oxy, nitro or premixed oxy-nitro), or in air, with/without chemical additives or in vacuum. Reducing atmosphere can be achieved with the optional 2-gas purging atmosphere control apparatus purgon forming gas (8% ydrogen-balance) mixed with nitrogen (optional).
|
Bench-top, only 325 (D) x 320 (W) x 670 (H) mm |
|
Feather-weight, only 38 kgs |
|
Oper. temp. 1700oC (continuous);1720oC (4 hrs max) |
|
Double steel shell design ensures outside furnace skin temperature below 60oC (EN661010 safety standard) |
|
Cooling fan ensuring continuous ventilation |
|
Muffle attachment provides direct gas purging of gas using single-flow meter air, oxygen, oxygen/nitrogen, or vacuum. |
|
Single gas inlet port allows single gas purge assembly including a flowmeter, pressure gauge, on-off valve.. |
|
Muffle alumina 99.6% tube Close One End (COE) OD=50 mm, H=305 mm |
|
Aluminium 3-pc set flange assembly equipped with water iports for sealing hermetically the end of the alumina muffle |
|
Molybdenum desilicide 1800-grade heating elements. |
|
Thermocouple port |
|
Precision, high stability,PID auto, 51-step temperature programmer controller (Temp. accuracy +/- 1oC) |
|
SCR (Silicon Control Rectifier) Controller & Trigger) |
|
Long life Platinum/Rhodium “B” type thermocouple |
|
1900-grade hot face with excellent temperature uniformity |
|
Control panel instrumentation |
|
|
Three different options of loading the crucible to heat-treat your gems |
OPTION A. WITHOUT MUFFLE
Model MB-1700 may be used for most common heating application without the muffle attachment where heating parameters are not critical.
|
.OPTION B. WITH PURGE TUBE
It is used where direct gas purging into the crucible is desired with selected or pre-mixed gas, oxy to enrich oxidizing atmosphere. |
OPTION C. WITH HALF-MUFFLE
Easily converted to a top-loading half-muffle equipped with metal flange allowing gas purging or in vacuum. |
|
|
|
|
Front door loading |
|
Slow cooling |
|
With/without additives |
|
No gas purge |
|
No vacuum |
|
Load: two cylindrical straight crucibles
OD=60 mm, H=95 mm 250 cc each |
|
|
Top loading |
|
Slow cooling |
|
With/without additives |
|
Gas purge |
|
No vacuum |
|
Load: One cylindrical straight crucible
(OD=40 mm, H=95 mm, net volume=180 cc |
|
|
Top loading |
|
Slow cooling |
|
With/without additives |
|
Gas purge |
|
With vacuum |
|
Load: One cylindrical straight crucible (OD=40 mm), H=95 mm, net volume =180 cc |
|
Standard items (Model M50-1700 |
|
Optional items (Model MB50-1700) |
|
Model MB50-1700 as described above |
|
CAT# V. Vacuum package: pump (3.6 m3/h, 5 Pa, 150 W), vacuum gauge, fittings and vacuum hose to be used with the half muffle tube.
|
|
1800-grade Molydbenum desilicide heating elements |
|
CAT# W. Water re-circulating system. It is required for half or full-muffle heating processes over 1500oC. Includes built-in pump, motor 220Vac-3 A, 2.4 gallon tank hoses, ready to be installed into the muffle flange.
|
|
B-type thermocouple |
|
Two sets of flange covers: One set sealing hermetically the muffle ceramic tube at the top; and one set at bottom. For half muffle tube one set is required. |
|
CAT# A. Two-gas atmosphere control module, including: two 65 mm flow flow-tubes for purging directly into the muffle oxygen, nitrogen or mixture of forming gas (8% hydrogen-balance nitrogen) or in any oxygen/nitrogen mixture in fully controllable atmosphere conditions to max.1700oC. It can be used with half-muffle or full muffle tube. |
|
Crucible, disk, plugs, other ceramics |
|
Muffle ceramic tube: One half (OD=50 mm, L=305 mm and one full (OD=50 mm, L=610m) |
UPGRADING TO 1800oC (MODEL MB50-1800)
Gemlab's furnace Model MB50-1700 has been designed and engineered to be easily converted for 1800oC furnace temperature operation 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 |
Standard package (Model MB40-1800)
Order: Model MB40-1800 as per above specs for model MB40-1700 but supplied with 1900-grade elements, one 20/40 type and one B-type thermocouple, one pc half (L=305mm and one pcs full (L=610m) muffle tube; pair of muffle flange-set, crucible, re-circulating water cooling system; full atmosphere control.
Delivery: FOB Bangkok Thailand, 6-8 weeks |
Comparison features between all Gemlab models, setting up heat-treatment facility and consumable required
|
