VMK-Vac-model

tmax up to 1050 °C

Laboratory chamber furnace, ASW insulation, gas and vacuum tight, 2 - 12 l, Tmax 1050 °C

Applications:

annealing, borating, brazing, bright annealing, carburization, heat treatment, nitriding, nitrocarburizing, reduction, sintering, surface coating, tempering

The most important characteristics

Fiber insulated laboratory furnace with vacuum and gas tight chamber
Operating temperature max. 1050 °C at protective gas operation
Operating temperature max. 600 °C at vacuum operation
Fiber insulated inner housing
Long-life Kanthal A1 heating elements
Furnace housing made out of stainless steel
High energy efficiency
High quality – made in Germany
Easy to handle

We make it possible

Linn High Therm is specialized in adapting its products to customer’s requirements. Please let us know if you need any modifications apart from our standard offer. We will do everything to satisfy your wishes.

Options

Temperature controller G800
Controller SE-40-Li
Multi functional unit
Serial interface
Process guiding software
Gas feeding unit for operation under vacuum
Burning-off device with flame supervision
Inconel muffle for temperatures up to 1150°C, vacuum up to 900°C
Safety package
Gas warning system
Vacuum pump with suction capacity 8,5 m3/h 10-2 mbar
Vacuum display

Product Specifications

Sizes

model	liter	Inside dimensions mm (wxdxh)	T. max. °C	kW
VMK-39-Vac	app. 2	135x170x80	1050	2,2
VMK-80-Vac	app. 4	160x190x130	1050	2,6
VMK-135-Vac	app. 7,2	200x260x140	1050	3,5
VMK-250-Vac	app. 12,2	180x340x200	1050	5,0

Technical details

Furnace housing

The attractively designed stainless steel furnace housing is provided with a shelf below the door which protects the operation elements against thermal and mechanical stress at the same time.

Heating

Long-live Kanthal A1 heating elements are embedded in the fiber muffle. The heating is effected from four sides so that a uniform temperature distribution in the furnace chamber is achieved.

Fibre insulation

The furnace chamber is vacuum formed in one ceramic fiber block. That way high insulation values can be achieved which result in a considerable reduction of the wall thickness of the insulation as well as of the weight at low energy saving volume. Circulating air between the insulation and furnace housing guarantees low outside wall temperatures.

In combination with the insulation, faster heating up and cooling down cycles as well as 40% lower current consumption can be achieved.

Vacuum tight muffle insert

Regarding the muffle insert, all heat loaded parts are made of heat resistant material (material number 1.4841), otherwise stainless steel, and are firmly fixed on the front side on the furnace frame by holding angles. The muffle inner pressure is designed for max. 4 – 7 mbar. The sealing flanges on the front side of the muffle are designed water cooled. The cooling water reflow is only designed for a pressureless reflow.

The gas inlet and gas outlet flanges are lead out at the back wall of the furnace. The water cooled vacuum flange is located between furnace front wall and door cooling flange. The vacuum and protective gas tight door closing is realized by a respective integrated sealing in the swivelling door. The swivelling door is pressed against the water cooled flange by four sealings.

Control system

In the lower part of the furnace housing the control unit with power part is installed.

It is equipped with the following instruments:

1 temperature controller G400
2 setpoint or 3 setpoint controller with PID behavior
logic output
one heating ramp – freely programmable velocity / ramp function (0,0 – 999,9 dig/min)
display of actual value (desired value displayed after pressing the button
self optimization prevents overshooting (pre-adjustment or automatic adjustment)
separation of control level and configuration level (prevents undesired changes)
alarm signal in case of thermocouple fracture
timer with turn-on & turn-off delay (adjustable 0,0 – 99,59 h/min)
1 timer for preselection of switch-on time

Product properties

Product Line:	type series
Operation Mode:	Batch
Construction Types:	Furnace
Designs:	Chamber furnace
Temperature Max (°C):	1050
Heatings:	electrical
Heatingmethods:	resistance
Atmospheres:	Air, Controlled gas atmosphere, Vacuum
Applications:	annealing, borating, brazing, bright annealing, carburization, heat treatment, nitriding, nitrocarburizing, reduction, sintering, surface coating, tempering

Products- Details