FRH/FRV-model

tmax up to 1800 °C

Tube furnace, high temperature, gas and/or vacuum tight, Ø 25 - 150 mm, heated length 150 - 1000 mm, Tmax 1800 °C

Applications:

activation, ashing, brazing, bright annealing, calcination, calibration, carburization, crystal growing, curing, CVD chemical vapour deposition, debinding, directional solidification, firing, fusion, gemstone heat treatment, heat treatment, melting, pulling, reduction, shrink fitting, sintering, soldering, stress-relieving, surface coating, tempering

The most important characteristics

Tube furnace type FRH / FRV
Max. temperature up to 1800 °C
Insulation made of energy saving fiber material
Integrated power reserve for attainment of temperature and control accuracy
3-zone connection of heating elements for better temperature control
Extremely short heating up and cooling down cycles
High quality stainless steel construction
Quality made in Germany
Easy operation and handling

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 program controller
Serial interface
Three-zone control
Process guiding software
Cable
Insert tubes
Protective gas tight end caps
Gas feeding device
Safety devices
Vacuum operation

Product Specifications

SIZES

Type	T. max. °C	zones	inner-Ø	Heated length mm	kW
FRH-25/150/1100	1150	1	25	150	0,25
FRH-40/250/1100	1150	1	40	250	0,60
FRH-40/500/1100	1150	1	40	500	1,20
FRH-70/250/1100	1150	1	70	250	0,90
FRH-70/500/1100	1150	1	70	500	1,80
FRH-100/500/1100	1150	1	100	500	2,60
FRH-40/220/1250	1300	1	40	220	0,86
FRH-40/520/1250	1300	1	40	520	1,35
FRH-70/520/1250	1300	1	70	520	2,22
FRH-100/520/1250	1300	1	100	520	2,88
FRH-3-40/750/1100	1200	3	40	750	1,80
FRH-3-70/750/1100	1150	3	70	750	2,70
FRH-3-100/1000/1100	1150	3	100	1000	5,20
FRH-3-150/1000/1100	1150	3	150	1000	7,60
FRH-3-40/750/1250	1300	3	40	750	2,77
FRH-3-70/1000/1250	1300	3	70	1000	5,02
FRH-3-100/1000/1250	1300	3	100	1000	7,08
FRH-3-150/1000/1250	1300	3	150	1000	9,50
FRH-40/250/1550	1600	1	40	250	1,60
FRH-40/500/1550	1600	1	40	500	3,00
FRH-67/250/1550	1600	1	67	250	2,40
FRH-67/500/1550	1600	1	67	500	4,80
Also available as tilted version FRHT / also available as vertical version FRV/FRVT.

Technical data

Furnace housing

The furnace housing consists of a stainless steel construction and is placed on an underframe. The furnace is characterized by an operating friendly design.

Insulation

The insulation exclusively consists of energy saving fiber material. A ceramic wool module with embedded heating coils respectively slotted SiC tube (1575°C) and corresponding end plates is used. Thin-walled, low heat storing materials enable extremely short heating up and cooling down cycles. Due to a circulating air layer between insulation and sheet metal housing, low outside wall temperatures are reached.

Heating

The furnace is heated with embedded Kanthal heating coils. They are fixed on the inner diameter of the heating tube and can optionally be switched in three zones. The heating elements are operated by transformers and electronic load relays/thyristor controller. This tube furnace disposes of a power reserve in order to be able to reach the desired temperature and control accuracy.

Thermocouple

Each 1 PtRh-Pt thermocouple (accuracy: class 2 according to DIN IEC 584 part 2) respectively NiCr-Ni thermocouple (1150°C) is installed in the middle and in one of the outer heating zones and is led to the corresponding temperature controller. The thermocouples are inserted between two windings of the heating element and look into the useful chamber by app. 5 mm.

Switch and control unit

The switch and control unit with power part is installed in a separate housing and is connected with the tube furnace by flexible lines (1 to 1,5 mm). Among other things, the control unit is equipped with minimum one temperature controller G 400.

Product properties

Product Line:	type series
Operation Mode:	Batch
Construction Types:	Furnace
Designs:	Bell type furnace, Bottom loader furnace, Crucible furnace, Laboratory furnace, Push-through furnace, Shaft furnace, Tube furnace
Temperature Max (°C):	1800
Heatings:	electrical
Heatingmethods:	resistance
Atmospheres:	Air, Controlled gas atmosphere, Overpressure, Vacuum
Applications:	activation, ashing, brazing, bright annealing, calcination, calibration, carburization, crystal growing, curing, CVD chemical vapour deposition, debinding, directional solidification, firing, fusion, gemstone heat treatment, heat treatment, melting, pulling, reduction, shrink fitting, sintering, soldering, stress-relieving, surface coating, tempering