Technical Specifications ( Gemlab 1800°C Furnace Model 181-3B)
|
Furnace type
|
Bottom loading/vertical muffle with electro-mechanical elevator. |
Max.oper.temp. (air) |
1800° C in air (Accuracy +/- 0.1% plus 1 digit) |
Loading capacity |
Up to 3,700 CTS of ruby-sapphire in batch process. Multi-crucible configuration for testing up to 12 different types of rubies or sapphires without mixing each other, in the same run. |
Loading method
|
The stones can be loaded/unloaded into/from the heating chambers from the top by simply removing the muffle flange. The stones can also be loaded/unloaded into/from the heating chambers from the battom using an electro-mechanical elevator. The rate of bottom loading/unloading can be fully controlled via UP/DOWN control buttons without removing the ceramic muffle. |
Controls |
Process indicator pilot lights, key-switch (ON/OFF), locking cabinet, emergency switch, buzzer-alarm, hour-meter, heater-breaker relay alarm, transformer thermostat, power in/out voltmeters & ammeters, all completely wired and packaged in an attractive floor standing 4-wheeled cabinet. |
Power control |
SCR (Silicon Control Rectifier) phase-angle controller with current limit. |
Atmosphere control |
Gas-tight, open-loop, two-gas mixing sys: flowmeters, precision pressure valves, backpressure meter, by-passing valves, safety one-way flow valves. The furnace can perform heating processes at 1800°C in oxygen, nitrogen, and mixtures of nitrogen/oxygen, carbon monoxide-carbon dioxide, hydrogen/nitrogen with/without chemical additives. |
Muffle |
Ceramic (99.99% alumina) muffle vertically positioned equipped with water cooled flange assembly. |
Exhaust
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Copper tubing with jar-trap and 150 micron gas filter. |
Cooling
|
Self-contained, 2.5 gallon water recirculating module prevents melting the O-rings installed of the muffle's flanges. |
Heat.elements
|
Molybdenum desilicide Kanthal S-1900 elements (4 pieces, element temperature is 1850oC, delivery temperature is 1800°C) |
Rated power
|
6 KVA |
Rated input volt
|
208/230 VAC, single-phase, 50/60 Hz |
Resistive input load
|
15A @ 220VAC (full power) |
Heat-up time
|
6 hours to 1800°C (full power, no muffle, no load) |
Cool-down time
|
From 1800°C to 1200° C in 25 minutes |
Temperature controllers |
Main process: Eurotherm 818P or Shimaden FP-23 digital microprocessor temperature programmer-controller (9 steps/program, 9 linkable programs) |
Over temperature: Single step digital microprocessor temperature limit controller. Furnace will shut down in the even of overtemperature in hot zone at user selectable temperature; Eurotherm E-92 or Omron. |
Cooling: Single step OMRON digital microprocessor controller monitors the fans installed in the furnace for cooling the elements. |
Temperature sensors
|
Three thermocouples: Type "20/40" (for E818P or for Shimaden FP-23); "S" type (for E-92 or Omron); "K" type (for Omron). |
Operating conditions
|
Temp. 10 - 55° C; humidity 0-90% RH |
Dimensions |
Power module: 60cm x 60cm x 165 cm on wheels
Furnace module: 50cm x 50cm x160cm on wheels
Cooling module: 40cm x 50cm x 110cm on wheels |
Gross weight |
290 kg (approximately) |
Delivery |
6-8 weeks after receipt of full payment |
Budgetary price |
Please contact us |
