Laboratory

Compact Tube Furnaces

RD 30/200/11

Over-temperature limiter

The RD tube furnaces convince with their unbeatable price-performance ratio, very compact outer dimensions and their low weight. These all-rounders are equipped with a working tube which also serves as support for the heating wires. Thus, the working tube is part of the furnace heating which has the advantage that the furnaces achieve very high heat-up rates. The tube furnaces can be supplied for 1100 °C or 1300 °C. Both models are designed for horizontal application. If the customer requires protective gas atmosphere, a separate working tube incl. gas supply system 1, e.g. made of quartz glass, must be inserted in the working tube.

  • Tmax 1100 °C or 1300 °C
  • Housing made of sheets of textured stainless steel
  • Inner diameter of the tube: 30 mm, heated length: 200 mm
  • Working tube made of C 530 material including two fiber plugs as standard
  • Thermocouple type K (1100 °C) or type S (1300 °C)
  • Solid state relays provide for low-noise operation of the heating
  • Heating wires wound directly around the working tube resulting in very fast heat-up rates
  • Defined application within the constraints of the operating instructions

Additional equipment

  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
  • Gas supply system for non-flammable protective or reactive gas
ModelTmaxOuter dimensions in mmInner tube ØHeated Length constantConnectedMinutesElectricalWeight
 
°C1
W
D
H
in mmlength
in mmtemperature +/- 5 K in mm1load 
kW
to Tmax2
connection*in 
kg
RD 30/200/11110035020035030200651.5201-phase12
RD 30/200/13130035020035030200651.5251-phase12
1Values outside the tube. Temperature inside the tube up to + 30 K *Please see page 60 for more information about supply voltage
2If connected at 230 V 1/N/PE rsp. 400 V 3/N/PE
 

Tube furnace R 170/1000/13 Tube furnace R 50/250/13 with gas supply system 2

These compact tube furnaces with integrated control systems can be used universally for many processes. Equipped with a standard working tube of C 530 ceramic and two fiber plugs, these tube furnaces have an unbeatable price/performance ratio.

  • Tmax 1200 °C or 1300 °C
  • Single-zoned design as standard
  • Dual shell housing made of sheets of textured stainless steel
  • Outer tube diameter of 50 mm to 170 mm, heated length from 250 mm to 1000 mm
  • Working tube of C 530 ceramic including two fiber plugs as standard equipment
  • Tmax 1200 °C: Type N thermocouple
  • Tmax 1300 °C: Type S thermocouple
  • Solid state relays provide for low­noise operation
  • Defined application within the constraints of the operating instructions
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Additional equipment

  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
  • Charge control with temperature measurement in the working tube and in the furnace chamber outside the tube
  • Three-zoned design (heated length from 500 mm)
  • Gas supply systems for protective gas or vacuum operation
  • Process control and documentation via VCD software package for monitoring, documentation and control
ModelTmaxOuter dimensions in mmOuter tube ØHeated Length constantTube lengthConnectedElectricalWeight
      lengthtemperature +/- 5 K 
in mm1 load   
 °C1W2DHin mmin mmsingle-zonedthree-zonedin mmkWconnection*in kg
R 50/250/1212004343405085025080-4501.61-phase22
R 50/500/121200670340508505001702507002.331-phase34
R 120/500/1212006704105781205001702507006.53-phase44
R 170/750/121200920460628170750250375107010.03-phase74
R 170/1000/12120011704606281701000330500140011.53-phase89
             
R 50/250/1313004343405085025080-4501.61-phase22
R 50/500/131300670340508505001702507002.331-phase34
R 120/500/1313006704105781205001702507006.53-phase44
R 170/750/131300920460628170750250375107010.03-phase74
R 170/1000/13130011704606281701000500500140011.53-phase89
1Values outside the tube. Temperature inside the tube up to + 30 K *Please see page 60 for more information about supply voltage
2Without tube
3Only valid for single-zone version
 

Tube Furnaces with Stand for Horizontal or Vertical Operation

Tube furnace RT 50-250/11 Tube furnace RT 50-250/13

These compact tube furnaces are used when laboratory experiments must be performed horizontally, vertically, or at specific angles. The ability to configure the angle of tilt and the working height, and their compact design, also make these tube furnaces suitable for integration into existing process systems.

  • Tmax 1100 °C, 1300 °C, or 1500 °C
  • Compact design
  • Vertical or horizontal operation freely adjustable
  • Working height freely adjustable
  • Working tube made of C 530 ceramic
  • Type S thermocouple
  • Operation also possible separate from stand if safety guidelines are observed
  • Control system integrated in furnace base
  • Defined application within the constraints of the operating instructions
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive
ModelTmaxOuter dimensions in mmInner tube ØHeated Length constantTube lengthConnectedElectricalWeight
 
°C
W1
D
H
in mmlength 
in mmtemperature +/- 5 K in mm1
in mmload
kW
connection*in
kg
RT 50-250/11110035038074050250803601.81-phase25
RT 50-250/13130035038074050250803601.81-phase25
RT 30-200/15150044547574030200703601.81-phase45
1Values outside the tube. Temperature inside the tube up to + 30 K*Please see page 60 for more information about supply voltage
 

High-Temperature Tube Furnaces with SiC Rod Heating Gas Atmosphere or Vacuum

Tube furnace RHTC 80-230/15 with manual gas supply system Tube furnace RHTC 80-450/15

SiC rod heating

These compact tube furnaces with SiC rod heating and integrated switchgear and controller can be used universally for many processes. With an easy to replace working tube as well as additional standard equipment options, these furnaces are flexible and can be used for a wide range of applications. The high-quality fiber insulation ensures fast heating and cooling times. The SiC heating rods installed parallel to the working tube ensure excellent temperature uniformity. The price-performance ratio for this temperature range is unbeatable.

  • Tmax 1500 °C
  • Housing made of sheets of textured stainless steel
  • High-quality fiber insulation
  • Active cooling of housing for low surface temperatures
  • Type S thermocouple
  • Solid state relays provide for low-noise operation
  • Prepared for assembly of working tubes with water-cooled flanges
  • Ceramic tube, C 799 quality
  • Defined application within the constraints of the operating instructions
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Additional equipment

  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
  • Charge control with temperature measurement in the working tube and in the furnace chamber outside the tube
  • Fiber plugs
  • Check valve at gas outlet avoids intrusion of false air
  • Working tubes for operation with water-cooled flanges
  • Display of inner tube temperature with additional thermocouple
  • Alternative gas supply systems for protective gas or vacuum operation
  • Process control and documentation via VCD software package for monitoring, documentation and control
ModelTmaxOuter dimensions in mmOuter tube Ø/Heated Length constantTube lengthConnectedElectricalWeight
 
°C3
W
D
H
in mmlength
in mmtemperature +/- 5 K in mm3
in mmload 
kW
connection*in 
kg
RHTC 80-230/15150060043058080230806007.53-phase250
RHTC 80-450/1515008204305808045015083011.33-phase170
RHTC 80-710/151500107543058080710235108013.83-phase190
1Heating only between two phases *Please see page 60 for more information about supply voltage
2Heating only between phase 1 and neutral 3Values outside the tube. Temperature inside the tube up to + 30 K
 

High-Temperature Tube Furnaces for Horizontal and Vertical Operation up to 1800 °C Gas Atmosphere or Vacuum

Tube furnace RHTH 120/600/17 Tube furnace RHTV 120/480/16 LBS with working tube closed at one side, protective gas and vacuum option as well as with electric screw drive of the lift table

RHTV 50/150/17 vertical tube furnace with stand and gas supply system 2 as additional equipment

Tube furnace RHTH 120/600/18

The high-temperature tube furnaces are available in either horizontal (type RHTH) or vertical (type RHTV) designs. High-quality insulation materials made of vacuum-formed fiber plates enable energy-saving operation and a fast heating time due to low heat storage and heat conductivity. By using different gas supply systems, operations can be performed under non-flammable or flammable protective or reactive gases or under vacuum.

  • Tmax 1600 °C, 1700 °C, or 1800 °C
  • MoSi2 heating elements, mounted vertically for easy replacement
  • Insulation with vacuum-formed ceramic fiber plates
  • Rectangular outer housing with slots for convection cooling
  • Tube furnaces RHTV with frame for vertical operation
  • Housing made of sheets of textured stainless steel
  • Ceramic working tube made of material C 799 incl. fiber plugs operation under air
  • Type B thermocouple
  • Power unit with low-voltage transformer and thyristor
  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load and with selectable maximum temperature gradient as tube protection
  • Switchgear and control unit separate from furnace in separate floor standing cabinet
  • Defined application within the constraints of the operating instructions
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Additional equipment

  • Charge control with temperature measurement in the working tube and in the furnace chamber outside the tube
  • Display of inner tube temperature with additional thermocouple
  • Gas tight flanges for protective gas and vacuum operation
  • Manual or automatic gas supply system
  • Three-zone control for optimization of temperature uniformity (only tube furnaces RHTH)
  • Check valve at gas outlet avoids intrusion of false air
ModelTmaxOuter dimensions in mmMax. outer tube ØHeated lengthLength constant temperature +/- 5 KTube lengthConnected loadElectricalWeight
Horizontal design°C3W2DHin mmin mmin mm3in mm Wconnection*in kg
RHTH 50/150/..1600 or47048064050150503805.43-phase170
RHTH 80/300/..1700 or620550640803001005309.03-phase190
RHTH 120/600/..180092055064012060020083014.43-phase1110
ModelTmaxOuter dimensions in mmMax. outer tube ØHeated lengthLength constant temperature +/- 5 KTube lengthConnected loadElectricalWeight
Vertical design°C3WDH2in mmin mmin mm3in mmkWconnection*in kg
RHTV 50/150/..1600 or50065051050150303805.43-phase170
RHTV 80/300/..1700 or580650660803008053010.33-phase190
RHTV 120/600/..180058065096012060017083019.03-phase1110
1Heating only between two phases *Please see page 60 for more information about supply voltage
2Without tube 3Values outside the tube. Temperature inside the tube up to - 50 K
 

Split-Type Tube Furnaces for Horizontal or Vertical Operation up to 1300 °C Gas Atmosphere or Vacuum

Tube furnace RSV 170/750/13 Tube furnace RS 120/1000/13S with gas tight tube, heating elements embedded in fiber module, charge control and check valve at gas outlet

Tube furnace RS 120/750/13 with gas supply system 4, hydrogen applications

Quartz glass and flanges for protective gas operation as optional equipment

Tube furnace RSH 120/1000/11S, three-zone controlled, incl. zone separators to reach a temperature gradient

Tube furnace RSH 50/500/13

These tube furnaces can be used for horizontal (RSH) or vertical (RSV) operation. The split-type design makes it easy to change the working tube. It allows for a comfortable exchange of various working tubes (e.g. working tubes made of different materials).

Using the wide range of accessories these professional tube furnaces can be optimally tailored to your process. By upgrading the furnaces with different gas supply systems the operation in a protective gas atmosphere, under vacuum or under flammable protective or reactive gases is possible. Besides convenient standard controllers for process control modern PLC control systems are also available.

  • Tmax 1100 °C or 1300 °C
  • Housing made of sheets of textured stainless steel
  • Tmax 1100 °C: Type N thermocouple
  • Tmax 1300 °C: Type S thermocouple
  • Frame for vertical operation (RSV)
  • Split-type design for simple insertion of the working tube
  • Working tube made of ceramic C 530 for operation in air included in scope of delivery
  • Heating elements on support tubes provide for free radiation
  • RSV: switchgear and control unit separate from furnace in own wall or standing cabinet
  • RSH: switchgear and control unit integrated in furnace housing
  • Defined application within the constraints of the operating instructions
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Additional equipment

  • Charge control with temperature measurement in the working tube and in the furnace chamber outside the tube
  • Display of inner tube temperature with additional thermocouple
  • Different gas supply systems for non-flammable or flammable protective or reactive gases and vacuum operation
  • Three-zone control for optimization of temperature uniformity
  • Cooling systems for accelerated cooling of the working tube and charge
  • Check valve at gas outlet avoids intrusion of false air
  • Base frame with integrated switchgear and controller
  • Process control and documentation via VCD software package or Nabertherm Control Center (NCC) for monitoring, documentation and control
ModelTmaxOuter dimensions in mmMax. outer tube ØHeated length Length constant temperature +/- 5 KTube length
Connected loadElectrical
Weight
       in mm1 kW3 in
 °C1W2DHin mmin mmsingle zonedthree zonedin mm1100 °C1300 °Cconnection*kg
RSH 50/250/.. 4203705105025080-650 1.9 1.91-phase25
RSH 50/500/..110067037051050500170250850 3.4 3.41-phase436
RSH 120/500/..or670440580120500170250850 6.6 6.63-phase446
RSH 170/750/..13009204906301707502503751100 10.6 12.03-phase476
RSH 170/1000/.. 117049063017010003305001350 13.7 13.73-phase491
              
RSV 50/250/.. 5455909755025080-650 1.9 1.91-phase25
RSV 50/500/..1100545590122550500170250850 3.4 3.43-phase436
RSV 120/500/..or6155901225120500170250850 6.6 6.63-phase446
RSV 170/750/..130066559014751707502503751100 10.6 12.03-phase476
RSV 170/1000/.. 665590172517010003305001350 13.7 13.73-phase491
1Values outside the tube. Temperature inside the tube up to + 30 K 3At 415 volt
2Without tube 4At 3-phase execution an N conductor ist required (3/N/PE)
*Please see page 60 for more information about supply voltage
 

Rotary Tube Furnaces for Batch Operation up to 1100 °C

Rotary tube furnace RSRB 120/750/11 as tabletop version for batch operation Rotary tube furnace RSRB 120/500/11

Rotary tube furnace tilted towards the right side for charging and batch operation

Rotary tube furnace tilted towards the left side to discharge

Connection set for vacuum operation

Gas tight closing plug for tubes made of quartz glass closed at one side

The rotary tube furnaces of the RSRB series are ideally suited for batch operation. The permanent rotation of the working tube ensures that the charge is constantly in motion. Due to the special shape of the quartz reactor with the tapered pipe ends the batch is kept in the rotary tube furnace and can be heat-treated an arbitrarily long time period time; a controlled heating to the temperature profiles is also possible.

  • Tmax 1100 °C
  • Thermocouple type K
  • Housing made of sheets of textured stainless steel
  • Tube furnace designed as table-top model with quartz glass reactor which opens on both sides, tapered ends
  • Reactor is removed for emptying out of the rotary tube furnace. Beltless drive and hinged furnace housing (opening temperature < 180 °C) provide for very easy removal through
  • Adjustable drive of approx. 2-45 rpm
  • Switchgear and control unit separate from tube furnace in own wall or standing cabinet
  • Defined application within the constraints of the operating instructions
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Additional equipment

  • Three-zone control for the optimization of temperature uniformity
  • Temperature display unit in the working tube with measurement by means of an additional thermocouple
  • Charge control by means of an additional thermocouple in the working tube
  • Different gassing ensures good flushing of the charge with process gas through inlet on one side and outlet on other side of tube
  • Gas-tight rotary feedthrough for connection of the rotating reactor to a gas supply system
  • Check valve at gas outlet avoids intrusion of false air
  • Vacuum design, up to 10-2 mbar depending on the applied pump
  • Open on both sides reactor made of quartz glass with knobs for better mixing of the charge in the tube
  • Package for improved charging and discharging of the working tube in the following design:
    • Mixing reactor made of quartz glass with integrated blade for better mixing of the batch, closed on one side, large opening on the other side
    • Tilting mechanism to the left/to the right. For charging and heat treatment, the furnace is tilted towards the right side until the stop so that the load is charged into the rotary tube furnace. For discharge, the furnace is tilted towards the other side to discharge the powder from the reactor. It is no longer necessary to remove the reactor.
    • Rotary tube furnace assembled on base with integrated switchgear and controller, incl. transport casters
  • Process control and documentation via VCD software package or Nabertherm Control Center (NCC) for monitoring, documentation and control
ModelTmaxOuter dimensions in mmMax. outer Ø TerminalHeated Length constant Tube lengthConnectedElectricalWeight
  (Table-top model)tube Ø/endlengthTemperature +/- 5 K 
in mm3 load in
 °C3WDHin mmin mmin mmsingle zonedthree zonedin mmkWconnection*kg
RSRB 80-500/1111001145475390762850017025011403.71-phase100
RSRB 80-750/1111001395475390762875025037513904.93-phase2115
RSRB 120-500/11110011455254401062850017025011405.13-phase2105
RSRB 120-750/11110013955254401062875025037513906.63-phase1120
RSRB 120-1000/111100164552544010628100033050016409.33-phase1125
1Heating only between two phases *Please see page 60 for more information about supply voltage
2Heating only between phase 1 and neutral 3Values outside the tube. Temperature inside the tube up to + 30 K
 

Rotary Tube Furnaces for Continuous Processes up to 1300 °C

Rotary tube furnace RSRC 120/1000/13 H2 for processes under hydrogen or in vacuum incl. safety system Rotary tube furnace RSRC 120/750/13

Screw-conveyor with adjustable speed

Screw-conveyors with different pitches for the adaption to the charge

Adapters for alternative operation with working tube or process reactor

Vibration generator at the charging funnel for improved powder supply

The RSRC rotary tube furnaces are particularly suitable for processes where continuously running batch material is heated for a short time.

The rotary tube furnace is positioned slightly inclined heated-up to the target temperature. The material is then continuously supplied at the upper end of the tube. It passes through the heated area of the tube and falls on the lower end out of the tube. The time of heat treatment results from the inclination angle, the rotational speed and the length of the working tube, as well as from the flow properties of the batch material.

Equipped with the optional closed loading system for 5 liter charge material incl. receptacle, the rotary tube furnace can also be used for processes under protective gas or vacuum.

Depending on process, charge and required maximum temperature, different working tubes made of quartz glass, ceramics or metal to be used (see page 42). This rotary tube furnace is therefore highly adaptable for different processes.
  • Tmax 1100 °C
    • Working tube made of quartz glass open at both sides
    • Thermocouple type K
  • Tmax 1300 °C
    • Open tube made of ceramics C 530
    • Thermocouple type S
  • Heating elements on support tubes provide for free radiation
  • Housing made of sheets of textured stainless steel
  • Adjustable drive of approx. 2-45 rpm
  • Digital display unit for the tilting angle of the rotary tube furnace
  • Beltless drive and split-type furnace housing (opening temperature < 180 °C) provide for very easy tube removal
  • Compact system, rotary tube furnace positioned on a base frame with
    • Manual spindle drive with crank to preset the tilting angle
    • Switchgear and controls integrated
    • Castors
  • Defined application within the constraints of the operating instructions
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Additional equipment

  • Three-zone control for the optimization of temperature uniformity
  • Temperature display unit in the working tube with measurement by means of an additional thermocouple
  • Charge control by means of an additional thermocouple in the working tube
  • Different gassing systems with good flushing of the charge with process gas in counterflow (only in combination with feeding system below)
  • Check valve at gas outlet avoids intrusion of false air
  • Vacuum design, up to 10-2 mbar depending on the applied pump
  • Charging system for continuous material transport, consisting of:
    • Stainless steel funnel incl. electric vibration generator to optimize the material feeding into the working tube
    • Electrically driven screw-conveyor at the inlet of the working tube with 10, 20 or 40 mm pitch and adjustable speed between 0.28 and 6 revolutions per minute, different gear transmissions for other speeds on request
    • Collecting bottle made of laboratory glass at the outlet of the working tube
    • Suitable for operation in gas atmosphere or vacuum
  • Working tubes made of differents materials
  • Quartz glass batch reactors, Tmax 1100 °C
  • Higher temperatures up to 1600  °C available on request
  • Digital display unit for the tilting angle of the furnace
  • Electric linear drive for the adjustment of the tilting angle
  • PLC controls for temperature control and the control of connected aggregates such as gearshift and speed of the screw-conveyor, speed of the working tube, switching of the vibration generator, etc.
  • Process control and documentation via VCD software package or Nabertherm Control Center (NCC) for monitoring, documentation and control
ModelTmaxOuter dimensions in mmMax. outer Heated Length constant Tube lengthConnectedElectricalWeight
     tube ØlengthTemperature +/- 5 K in mm3 load in
 °C3WDHin mmin mmsingle zonedthree zonedin mmkWconnection*kg
RSRC 80-500/1111002505104516558050017025015403.71-phase555
RSRC 80-750/1111002755104516558075025037517904.93-phase2570
RSRC 120-500/11110025051045171511050017025015405.13-phase2585
RSRC 120-750/11110027551045171511075025037517906.63-phase1600
RSRC 120-1000/111100300510451715110100033050020409.33-phase1605
             
RSRC 80-500/1313002505104516558050017025015406.33-phase1555
RSRC 80-750/1313002755104516558075025037517909.63-phase1570
RSRC 120-500/13130025051045171511050017025015408.13-phase1585
RSRC 120-750/131300275510451715110750250375179012.93-phase1600
RSRC 120-1000/1313003005104517151101000330500204012.93-phase1605
1Heating only between two phases *Please see page 60 for more information about supply voltage
2Heating only between phase 1 and neutral
3Values outside the tube. Temperature inside the tube up to + 30 K
 

Gas Supply Systems/Vacuum Operation for Tube Furnaces

Gas supply system 1: Fiber plugs with protective gas connection, suitable for many laboratory applications

Water-cooled stainless steel flange

Gas supply system for non-flammable protective or reactive gas with shutoff valve and flow meter with regulator valve, piped and ready to connect

Observation window as additional equipment for gas tight flanges

When equipped with various equipment packages, the tube furnace product lines can be adapted for operation with nonflammable or flammable gasses or for vacuum operation.

Gas Supply System 1 for non-flammable protective or reactive gases Not gastight, no vacuum operation

This package represents a basic version sufficient for many applications, for operation with non-flammable protective or reactive gasses. The standard working tube made of ceramic C 530 delivered with the furnace can still be used.

  • Available for tube furnaces RD, R, RT, RSH and RSV
  • Standard working tube can be used
  • 2 plugs made of porous, non-classified ceramic fiber incl. protective gas connections
  • Gas supply system for nonflammable protective gas (Ar, N2, forming gas, others on request) with shutoff valve and flow meter with control valve, piped and ready to connect. One gas intake pressure at 300 mbar to be provided by customer.

Additional equipment

  • Extension of gas supply system with a second or third nonflammable type of gas
  • Bottle pressure regulator for use with bottled gas
  • Automatic switching on/off by means of the program segments of the controller, only possible with control systems which include programmable extra functions
Gas Supply System 2 for non-flammable protective or reactive gases/vacuum operation

For increased atmospheric purity requirements in the working tube, we recommend this gas supply system. The system can also be equipped for vacuum operation.

  • Available for tube furnaces R, RSH, RSV, RSRB, RSRC, RHTC, RHTH, RHTV
  • Gas supply system for nonflammable protective gas (Ar, N2, forming gas, others on request) with shutoff valve and flow meter with control valve, piped and ready to connect. One gas intake pressure at 300 mbar to be provided by customer.
  • Additional equipment for static tube furnaces:
    • Longer, gas tight working tube of ceramic C 610 for furnaces to 1300 C or of C 799 for temperatures above 1300  C
    • 2 vacuum-tight, water-cooled stainless steel flanges with fittings on the outlet side (cooling water supply with NW9 hose connector to be provided by the customer)
    • Mounting system on furnace for the flanges
  • Additional equipment for RSRC models (continuous operation): charging system
  • Additional Equipment for RSRB models: gas-tight rotarylead-outs on gas inlet and outlet, gas cooler and gas outlet valve

Additional equipment

  • Extension of gas supply system with a second or third nonflammable type of gas
  • Bottle pressure regulator for use with bottled gas
  • Automatic switching on/off by means of the program segments of the controller, only possible with control systems which include programmable extra functions
  • Gas-supply programmable via mass-flow controllers (only in combination with PLC-controls)
  • Process tubes made of different materials
  • Quick-locks for watercooled flanges
  • Cooling unit for closed loop water circuit
  • Window for charge observation in combination with gas tight flanges

Vacuum Operation

  • Vacuum package for evacuation of the working tube, consisting of connector for the gas outlet, ball valve, manometer, manually operated rotary vane vacuum pump with corrugated stainless steel hose connected to the gas outlet, max. attainable end pressure in working tube depending on pump type
  • Pumps for max. final pressure of up to 10-5 mbar (models RSRB/RSRC up to 10‑2 mbar) on request
  • The decrease in strength of the working tube at high temperatures limits the maximum operating temperature under vacuum
 

RHTH 120-600/18 with gas supply system4 for hydrogen operation

Water-cooled end flange with quick connectors as additional equipment

Gas Supply System 4 for hydrogen, fully-automatic, unattended operation

Adding gas supply system 4 to the tube furnace allows operation under a hydrogen atmosphere. During hydrogen operation, a safety pressure of approx. 30 mbar is ensured in the working tube. Surplus hydrogen is burnt off in an exhaust gas torch. With extended safety logic and an integrated nitrogen purge container, the system can be used for fully-automatic, unattended operation. Equipped with a Safety-PLC control system, pre-purging, hydrogen inlet, operation, fault monitoring and purging at the end of the process are carried out automatically. In case of default, the tube is immediately purged with nitrogen and the system is automatically switched to a safe status.

  • Available for tube furnaces RSH, RSV, RSRC, RHTH and RHTV
  • Safety system for operation with flammable gases including monitoring of torch function and overpressure
  • Extended safety control system with emergency tube purging in case of default
  • Emergency purge container
  • Safety-PLC control system with touchpanel for data input
  • Exhaust gas torch
  • Pressure switch for monitoring the safety pressure
  • Gas supply system for H2 and N2. Volume adjustment is carried out by hand (the customer provides an H2 supply at 1 bar, an N2 supply at 10 bar, an O2 supply at 6-8 bar and a propan supply at 300 mbar)

Additional equipment

  • Gas supply system extension for additional nonflammable gas types
  • Operation with other flammable gases on request
  • Bottle pressure reducer for use with bottled gas
  • Cooling unit for closed loop water circuit
  • Vacuum packages (with hydrogen operation, this package can only be used for pre-evacuation)
  • Gas supply via program-dependent, controllable mass flow controllers
 

Vacuum Pumps

Vacuum pump stand for operation up to 10-5 mbar

Independent pressure gauge for a pressure range of 10-3 mbar or 10-9 mbar

With respect to the final pressure different pumps are available

  • Single-step rotary piston pump for a max. final pressure of approx. 20 mbar.
  • Two-step rotary piston pump for a max. final pressure of approx. 10-2 mbar.
  • Turbomolecular pump stand (rotary vane pump with following turbomolecular pump for a max. final pressure of 10-5 mbar.
  • Independent pressure gauge for a pressure range of 10-3 mbar or 10-9 mbar as additional equipment
Information:

For protection of the vacuum pump only cold stage evacuation is allowed.

 

Control Alternatives for Tube Furnaces

Three-Zone Furnace Chamber Control

Furnace control

Charge control

Thermocouple for charge control in the RHTH 120/600/18 furnace

Sintering under hydrogen in a tube furnace of RHTH product line

Three-Zone Furnace Chamber Control

The temperature is measured by thermocouples positioned outside of the working tube, one in the middle and two on the sides. The outer zones are controlled with a setpoint-offset in relation to the middle zone. This allows the heat loss at the ends of the tube to be compensated to ensure an extended zone of constant temperature (+/- 5 K).

Furnace Chamber Control 
with temperature measurement in furnace chamber outside the working tube.

  • Advantages: Thermocouple protected against damage and aggressive load, very even control, attractive price
  • Disadvantage: Temperature difference between displayed temperature on the controller and inside the tube

Extension Package for Furnace Chamber Control

  • with additional temperature measurement in the working tube and display of the measured temperature
  • Advantages: Very precise and rapid control adjustment
  • Disadvantage: Costs
Furnace Chamber vs. Charge Control ComparisonFurnace Chamber Control

Only the furnace chamber temperature is measured and controlled. Regulation is carried out slowly to avoid out-of-range values. As the charge temperature is not measured and controlled, it may vary a few degrees from the chamber temperature.

Charge Control

If the charge control is switched on, both the charge temperature and furnace chamber temperature are measured. By setting different parameters the heat-up and cooling processes can be individually adapted. This results in a more precise temperature control at the charge.