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Hot-Wall Retort Furnaces up to 1100 °C
 PRODUCT IMAGE PRODUCT IMAGE
 NR 75/06 with automatic gas injection and touch panel H 3700 NR 17/06 with gas supply system
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Inside heating in models NRA ../06

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Heating from outside around the retort in models NRA ../09 and NR ../11

NRA 17/06 - NRA 1000/11

These gas tight retort furnaces are equipped with direct or indirect heating depending on temperature. They are perfectly suited for various heat treatment processes requiring a defined protective or a reaction gas atmosphere. These compact models can also be laid out for heat treatment under vacuum up to 600 °C. The furnace chamber consists of a gas tight retort with water cooling around the door to protect the special sealing. Equipped with the corresponding safety technology, retort furnaces are also suitable for applications under reaction gases, such as hydrogen or, in combination with the IDB package, for inert debinding or for pyrolysis processes.

Different model versions are available depending on the temperature range required for the process:

Models NRA ../06 with Tmax 650 °C

  • Heating elements located inside the retort
  • Temperature uniformity up to ∆T 6 K inside the working chamber from 100  °C - 600  °C
  • Retort made of 1.4571
  • Gas circulation fan in the back of the retort provides for optimal temperature uniformity

Models NRA ../09 with Tmax 950 °C

  • Outside heating with heating elements surrounding the retort as well as an additional door heater
  • Temperature uniformity up to ∆T 6 K inside the working chamber from 200  °C - 900  °C
  • Retort made of 1.4841
  • Fan in the back of the retort provides for optimal temperature uniformity

Models NR ../11 with Tmax 1100 °C

  • Outside heating with heating elements surrounding the retort as well as an additional door heater
  • Temperature uniformity up to ∆T 10 K inside the working chamber from 200  °C - 1050  °C
  • Retort made of 1.4841

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NRA 480/04S

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NRA 50/09 H2

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Vacuum pump for cold evacuation of the retort

Basic version

  • Compact housing in frame design with removable stainless steel sheets
  • Controls and gas supply integrated in the furnace housing
  • Welded charging supports in the retort or air-baffle box in the furnace with air circulation
  • Swivel door hinged on right side with open cooling water system
  • Multi-zone control for 950  °C and 1100  °C version, separated by furnace chamber and door. Depending on furnace chamber additionally subdivided into one or several heating zones
  • Temperature control as charge control with temperature measurement inside and outside the retort
  • Gas supply system for one non-flammable protective or reaction gas with flow meter and solenoid valve, switchable via the control system
  • Operation under vacuum up to 600  °C with optional single-stage rotary vane pump
  • Port for vacuum pump for cold evacuation
  • PLC controls with touch panel H 700 for data input (resp. P 300 for 650  °C-version)

Additional equipment

  • Upgrade for other nonflammable gases
  • Automatic gas injection, including MFC flow controller for alternating volume flow, PLC controlled with touch panel H 3700
  • Vacuum pump for evacuating of the retort up to 600  °C, attainable vacuum up to 10-5 mbar subject to selected pump
  • Cooling system for shortening process times
  • Heat exchanger with closed-loop cooling water circuit for door cooling
  • Measuring device for residual oxygen content

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 PRODUCT IMAGE PRODUCT IMAGE
 NR 200/11 H2 for heat treatment under hydrogen Charging of the NR 300/06 furnace with a pallet truck
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Bayonet quick-lock for the retort, also with electric drive as additional equipment

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Parallel guided door to open the hot furnace as additional equipment

H2 Version for Operation under Hydrogen

When hydrogen is used as a process gas, the furnace is additionally equipped with the required safety technology. Only certified and industry proven safety sensors are used. The furnace is controlled by a fail-safe PLC control system (S7- 300F/safety controller).

  • H2 supply at controlled overpressure of 50 mbar relative
  • Certified safety concept
  • PLC controls with graphic touch panel H 3700 for data input
  • Redundant gas inlet valves for hydrogen
  • Monitored pre-pressures of all process gases
  • Bypass for safe flushing of furnace chamber with inert gas
  • Torch for thermal afterburning of exhaust gases
  • Emergency flood container for purging the furnace in case of failore

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IDB Version for Debinding under Non-flammable Protective Gases or for Pyrolysis Processes

The retort furnaces of the NR and NRA product line are perfectly suited for debinding under non-flammable protective gases or for pyrolysis processes. The IDB version of the furnaces implements a safety concept by controlled purging the furnace chamber with a protective gas. Exhaust gases are burned in an exhaust torch. Both the purging and the torch function are monitored to ensure a safe operation.

  • Process control under monitored and controlled overpressure of 50 mbar relative
  • Certified safety concept
  • PLC controls with graphic touch panel H 1700 for data input
  • Monitored gas pre-pressure of the process gas
  • Bypass for safe flushing of furnace chamber with inert gas
  • Torch for thermal afterburning of exhaust gases
ModelTmaxModelTmaxWorking chamber dimensions in mmUseful volumeElectrical
 °C °Cwdhin lconnection*
NRA 17/..650 or 950NR 17/111100225350225173-phase
NRA 25/..650 or 950NR 25/111100225500225253-phase
NRA 50/..650 or 950NR 50/111100325475325503-phase
NRA 75/..650 or 950NR 75/111100325700325753-phase
NRA 150/..650 or 950NR 150/1111004507504501503-phase
NRA 200/..650 or 950NR 200/11110045010004502003-phase
NRA 300/..650 or 950NR 300/1111005709005703003-phase
NRA 400/..650 or 950NR 400/11110057012505704003-phase
NRA 500/..650 or 950NR 500/11110072010007205003-phase
NRA 700/..650 or 950NR 700/11110072013507207003-phase
NRA 1000/..650 or 950NR 1000/111100870135087010003-phase
*Please see page 70 for more information about supply voltage

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PRODUCT IMAGE PRODUCT IMAGE
SRA 200/09 Retort furnace SRA 300/09
SRA 17/.. - SR 1500

The retort furnaces SR and SRA (with gas circulation) are designed for operation with non-flammable or flammable protective or reaction gases. The furnace is loaded from above by crane or other lifting equipment provided by the customer. In this way, even large charge weights can be loaded into the furnace chamber. The SR furnaces are available in different versions.

Depending on the temperature range in which the furnace be used, the following models are available:

Models SR .../11 with Tmax 1100 °C

  • Heating from all sides outside the retort
  • Temperature uniformity up to ∆T 14 K according to DIN 17052-1 within the working chamber of 500  °C - 1100  °C
  • Retort made of 1.4841
  • Top down multi-zone control of the furnace heating

Models SRA ../09 with Tmax 950 °C

  • Design like models SR…/11 with following differences:
    • Atmosphere circulation with powerful fan in the furnace lid provides for temperature uniformity of up to ∆T 8 K according to DIN 17052-1 within the working chamber of 200  C - 900  C

Models SRA ../06 with Tmax 600 °C

  • Design like models SRA…/09 with following differences: see page 64
    • Heating inside the retort
    • Temperature uniformity up to ∆T 14 K according to DIN 17052-1 within the working chamber of 100 C - 600  C
    • Single-zone control
    • Retort made of 1.4841

Standard Equipment (all models)

  • Design like standard equipment of models NR and NRA with following differences:
    • Charging from above with crane or other lifting equipment from customer
    • Hinged lid with opening to the side
  • Additional equipment, H2 version or IDB version see models NR and NRA
ModelTmaxInner dimensions of alloy retortVolumeOuter dimensions in mmHeating power in kW1ElectricalWeight
 °CØ in mmh in mmin lWDH600 °C950 °Cconnection*in kg
SRA 17/.. 2503501713001700180015203-phase600
SRA 25/.. 2505002513001900180020253-phase800
SRA 50/.. 4004505014002000180036353-phase1300
SRA 100/..60040080010014002000210045653-phase1500
SRA 200/..or60070020016002200220060903-phase2100
SRA 300/..9506001000300160022002500751203-phase2400
SRA 500/.. 8001000500180024002700701703-phase2800
SRA 600/.. 8001200600180024002900901903-phase3000
SRA 800/.. 100010008002000260028001052203-phase3100
SRA 1000/.. 1000130010002000260031001202503-phase3300
SRA 1500/.. 1200130015002200280033001503003-phase3500
            
SR 17/11110025035017130017001800223-phase600
SR 25/11110025050025130019001800273-phase800
SR 50/11110040045050140020001800403-phase1300
SR 100/111100400800100140020002100733-phase1500
SR 200/111100600700200160022002200983-phase2100
SR 300/11110060010003001600220025001323-phase2400
SR 500/11110080010005001800240027001823-phase2800
SR 600/11110080012006001800240029002053-phase3000
SR 800/111100100010008002000260028002353-phase3100
SR 1000/1111001000130010002000260031002683-phase3300
SR 1500/1111001200130015002200280033003153-phase3500
1Depending on furnace design connected load might be higher *Please see page 70 for more information about supply voltage

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Cold-Wall Retort Furnaces up to 2400 °C
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 VHT 8/18-KE with fiber insulation and molybdenum disilicide heating elements
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Heat treatment of copper bars under hydrogen in VHT 08/16 MO

VHT 8/18-GR - VHT 500/18-KE

The compact furnaces of the VHT product line are available as electrically heated chamber furnaces with graphite, molybdenum, tungsten or MoSi2 heating. A wide variety of heating designs as well as a complete range of accessories provide for optimal furnace configurations even for sophisticated applications.

The vacuum-tight retort allows heat treatment processes either in protective and reaction gas atmospheres or in a vacuum, subject to the individual furnace specs to 10-5 mbar. The basic furnace is suited for operation with non-flammable protective or reactive gases or under vacuum. The H2 version provides for operation under hydrogen or other flammable gases. Key of the specification up is a certified safety package providing for a safe operation at all times and triggers an appropriate emergency program in case of failure.

Alternative Heating Specifications

The following heating systems are available for the different application temperatures:

VHT ../GR with Graphite Insulation and Heating

  • Suitable for processes under protective and reaction gases or under vacuum
  • Tmax 1800  °C or 2200  °C (2400 °C as additional equipment)
  • Max. vacuum up to 10-4 mbar depending on pump type used
  • Graphite felt insulation

VHT ../MO or ../W with Molybdenum or Tungsten Heating

  • Suitable for high-purity processes under protective and reaction gases or under high vacuum
  • Tmax 1200  °C, 1600  °C or 1800  °C (see table)
  • Max. vacuum up to 5 x 10-5 mbar depending on pump type used
  • Insulation made of molybdenum rsp. tungsten radiation sheets

VHT ../KE with Fiber Insulation and Heating through Molybdenum Disilicide Heating Elements

  • Suitable for processes under protective and reaction gases, in air or under vacuum
  • Tmax 1800  °C
  • Max. vacuum up to 10-2 mbar (up to 1300  °C) depending on pump type
  • Insulation made of high purity aluminum oxide fiber

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Standard Equipment for all Models
  
  
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Graphite heating chamber

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Molybdenum heating chamber

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Tungsten heating chamber

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Ceramic fiber insulation

Basic version

  • Standard furnace sizes 8 - 500 liters
  • A water-cooled stainless steel process reactor sealed with temperature-resistant o-rings
  • Frame made of stable steel profiles, easy to service due to easily removable stainless steel panels
  • Housing of the VHT 8 model on castors for easy repositioning of furnace
  • Cooling water manifold with manual stopcocks in supply and return lines, automatic flowmeter monitoring, openloop cooling water system
  • Adjustable cooling water circuits with flowmeter and temperature indicator and overtemperature fuses
  • Switchgear and controller integrated in furnace housing
  • H 700 PLC control with clearly laid out 5.7“ touchpanel control for program entry and display, 10 programs each with 20 segments
  • Over-temperature limiter with manual reset for thermal protection class in accordance with EN 60519-2
  • Manual operation of the process gas and vacuum functions
  • Manual gas supply for one process gas (N2 or Ar) with adjustable flow
  • Bypass with manual valve for rapid filling or flooding of furnace chamber
  • Manual gas outlet with overflow valve (20 mbar relative)
  • Single-stage rotary vane pump with ball valve for pre-evacuating and heat treatment in a rough vacuum to 5 mbar
  • Pressure gauge for visual pressure monitoring

Additional equipment

  • Tmax 2400  °C
  • Housing, optionally divisible, for passing through narrow door frames (VHT 08)
  • Manual gas supply for second process gas (N2 or Ar) with adjustable flow and bypass
  • Inner process box made of molybdenum, tungsten or CFC, especially recommended for debinding processes. The box is installed in the furnace with direct gas inlet and outlet and provides for better temperature uniformity. Due to a change in gas supply direction after debinding a clean process atmosphere for sintering is achieved.
  • Charge thermocouple with display
  • Temperature measurement at 2200  °C models with pyrometer and thermocouple, type S with automatic pull-out device for precise control results in the low temperature range (VHT 40 and larger)
  • Two-stage rotary vane pump with ball valve for pre-evacuating and heat-treating in a vacuum to 10-2 mbar
  • Turbo molecular pump with slide valve for pre-evacuation and for heat treatment in a vacuum to 10-5 mbar including electric pressure transducer and booster pump (only VHT…/MO)
  • Other pumps on request
  • Heat exchanger with closed-loop cooling water circuit
  • Automation package with graphic touch panel H 3700
    • 12" graphic touch panel H 3700
    • Input of all process data like temperatures, heating rates, gas injection, vacuum at the touch panel
    • Display of all process-relevant data on a process control diagram
    • Automatic gas supply for one process gas (N2 , argon or forming gas) with adjustable flow
    • Bypass for flooding and filling the chamber with process gas controlled by the program
    • Automatic pre- and post programs, including leak test for safe furnace operation
    • Automatic gas outlet with bellows valve and overflow valve (20 mbar)
    • Transducer for absolute and relative pressure
  • MFC flow controller for alternating volume flow and generation of gas mixtures with second process gas (only with automation package)
  • Partial pressure operation: protective gas flushing at controlled underpressure (only with automation package)
  • PC control via NCC with corresponding optional documentation and connection to customer PC networks

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PRODUCT IMAGE PRODUCT IMAGE
VHT 40/16MO H2 VHT 40/22 GR with motor-driven lift door and front frame for connection to a glove box
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Single-stage rotary vane pump for heat treatment in a rough vacuum to 20 mbar

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Two-stage rotary vane pump for heat treatment in a vacuum to 10-2 mbar

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Turbo-molecular pump with booster pump for heat treatment in a vacuum to 10-5 mbar

H2 Version for Operation with Hydrogen or other Reaction Gases

In the H2 version the furnaces can be operated under hydrogen or other reaction gases. For these applications, the systems are additionally equipped with the required safety technology. Only certified and industry proven safety sensors are used. The furnaces are controlled by a fail-safe PLC control system (S7-300F/safety controller).

  • Certified safety concept
  • Automation package (see additional equipment above)
  • Redundant gas inlet valves for hydrogen
  • Monitored pre-pressures of all process gases
  • Bypass for safe purging of furnace chamber with inert gas
  • Pressure-monitored emergency flooding with automated solenoid valve opening
  • Electric or gas-heated exhaust gas torch for H2 post-combustion
  • Atmospheric operation: H2-purging of process reactor starting from room temperature at controlled over pressure (50 mbar relative)

Additional equipment

  • Partial pressure operation: H2 flushing at underpressure in the process reactor starting from 750  °C furnace chamber temperature
  • Retort in the process chamber for debinding under hydrogen

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 PRODUCT IMAGE
 VHT 08/16 MO with hydrogen extension package and process box
Process Box for Debinding in Inert Gas

Certain processes require charges to be debinded in non-flammable protective or reactive gases. For these processes we fundamentally recommend a hot-wall retort furnace (see models NR… or SR…). These furnaces can ensure that the formation of condensation will be avoided as throughly as possible.

If there is no way to avoid the escape of small amounts of residual binder during the process, even in the VHT furnace, the furnace should be designed to meet this contingency.

The furnace chamber is equipped with an additional process box that has a direct outlet to the exhaust gas torch through which the exhaust gas can be directly vented. This system enables a substantial reduction in the amount of furnace chamber contamination caused by the exhaust gases generated during debinding.

Depending on the exhaust gas composition the exhaust gas line can be designed to include various options.

  • Exhaust gas torch for burning off the exhaust gas
  • Condensation trap for separating out binding agents
  • Exhaust gas post-treatment, depending on the process, via scrubbers
  • Heated exhaust gas outlet to avoid condensation deposits in the exhaust gas line
 VHT ...-../GRVHT ...-../MOVHT ...-18/WVHT ...-18/KE
Tmax1800 °C or 2200 °C1200 °C or 1600 °C1800 °C1800 °C
Inert gas
Air/Oxygenup to 350 °C--
Hydrogen3331,3
Rough vacuum and fine vacuum (>10-3 mbar)²
High vacuum (<10-3 mbar)-²
Material of heaterGraphiteMolybdenumTungstenMoSi2
Material of insulationGraphite feltMolybdenumTungsten/MolybdenumCeramic fiber
¹Up to 1400 °C 3Only with safety package for flammable gases
²Depending on Tmax
ModelInner dimensions of process box in mmVolume
 wdhin l
VHT 8/..1202101503,5
VHT 40/..25043025025,0
VHT 70/..32547532550,0
VHT 100/..42550042590,0
VHT 250/..575700575230,0
VHT 500/..725850725445,0
ModelInner dimensions in mmVolumeMax. chargeOuter dimensions in mmHeating power in kW4
 wdhin lweight/kgWDHGraphiteMolybdenumTungstenCeramic fiber
VHT 8/..170240200851250 (800)¹110020002719/34³5012
VHT 40/..300450300403016002100230083/103²54/100³13430
VHT 70/..3755003757050170025002400105/125²70/130³16055
VHT 100/..45055045010075190026002500131/155²90/165³21085
VHT 250/..600750600250175230028002800180/210²125/220³on requeston request
VHT 500/..750900750500350250032003000220/260²on requeston requeston request
¹With the switching system unit removed ³1200 °C/1600 °C
²1800 °C/2200 °C 4Depending on furnace design connected load might be higher

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Pit-Type Cold-Wall Retort Furnaces up to 2400 °C or up to 3000 °C
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 SVHT 9/24-W with tungsten heating
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Cylindrical retort with tungsten heating

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Graphite heating module

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Water-cooling controls

SVHT 2/24-W - SVHT 9/30-GR

Compared with the VHT models (page 14 ff), the furnaces of the SVHT product line offer improved performance data with regard to achievable vacuum and maximum temperature. Due to the design as pit-type furnace with tungsten heating, processes up to max. 2400 °C even in high vacuum can be implemented with models of the SVHT..-W product line. Models of the SVHT..-GR product line with graphite heating, also in pit-type design, can be operated in an inert gas atmosphere even up to max. 3000 °C.

  • Standard sizes with a furnace chamber of 2 or 9 liters
  • Designed as pit-type furnace, charged from above
  • Frame construction with inserted sheets of textured stainless steel
  • Dual shell water-cooled stainless steel container
  • Manual operation of process gas and vacuum functions
  • Manual gas supply for non-combustible process gas
  • A step in front of the furnace for an ergonomic charging height
  • Retort lid with gas-charged shock absorbers
  • Controls and switchgear as well as gas supply integrated in furnace housing
  • Further standard product characteristics see description for standard design of VHT models

Heating options

SVHT ..-GR

  • Applicable for processes:
    • under protective or reaction gases or in the vacuum up to 2200  C
    • under inert gases (argon, helium) up to 3000  C
  • Max. vacuum up to 10-³ mbar depending on the type of pump used
  • Heating: graphite heating elements in cylindrical arrangement
  • Insulation: graphite felt insulation
  • Temperature measurement by means of an optical pyrometer

SVHT ..-W

  • Applicable for processes under protective or reaction gases or in vacuum up to 2400  °C
  • Max. vacuum up to 10- mbar depending on the type of pump used
  • Heating: cylindrical tungsten heating module
  • Insulation: tungsten and molybdenum radiant plates
  • Temperature measurement with optical pyrometer
  • Additional equipment such as automatic process gas control or design for the operation with flammable gases incl. safety system see VHT models
ModelTmaxWorking chamber dimensionsUseful volumeOuter dimensions in mmHeating power Electrical
 °CØ x h in mmin lWDHin kW1connection*
SVHT 2/24-W2400150 x 1502,5140025002100553-phase
SVHT 9/24-W2400230 x 2309,5150027502100953-phase
         
SVHT 2/30-GR3000150 x 1502,5140025002100553-phase
SVHT 9/30-GR3000230 x 2309,5150027502100953-phase
1Depending on furnace design connected load might be higher *Please see page 70 for more information about supply voltage

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Lift-Bottom­-Retort Furnace up to 2400 °C for Production
PRODUCT IMAGE PRODUCT IMAGE
LBVHT 600/24-GR LBVHT 250/20-W with tungsten heating chamber
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LBVHT with graphite heating chamber

LBVHT 100/16 - LBVHT 600/24

The LBVHT model series with lift-bottom specification are especially suitable for production processes which require either protective or reaction gase atmosphere or a vacuum. The basic performance specifications of these models are similar to the VHT models. Their size and design with electro-hydraulically driven table facilitate charging during production. The furnaces are available in various sizes and designs. Similar like the VHT models, these furnaces can be equipped with different heating concepts.

  • Standard furnace sizes between 100 and 600 liters
  • Designed as lift-bottom retort furnace with electro-hydraulically driven table for easy and well-arranged charging
  • Prepared to carry heavy charge weights
  • Different heating concepts using
    • Graphite heating chamber up to Tmax 2400  C
    • Molybdenum heating chamber up to Tmax 1600  C
    • Tungsten heating chamber up to Tmax 2000  C
  • Frame structure filled with textured stainless steel sheets
  • Standard design with gassing system for non-flammable protective or reaction gases
  • Automatic gas supply system which also allows for operation with several process gases as additional equipment
  • Gas supply systems for operating with hydrogen or other combustible reaction gases incl. safety package as additional equipment
  • Switchgear and control box as well as gassing system integrated into the furnace housing
  • Further product characteristics of the standard furnace as well as possible additional equipment can be found in the description of the VHT furnaces
ModelTmaxModelTmaxModelTmaxInner dimensions in mmVolumeElectrical
 °C °C °CØhin lconnection*
LBVHT 100/16-MO1600LBVHT 100/20-W2000LBVHT 100/24-GR24004507001003-phase
LBVHT 250/16-MO1600LBVHT 250/20-W2000LBVHT 250/24-GR24006009002503-phase
LBVHT 600/16-MO1600LBVHT 600/20-W2000LBVHT 600/24-GR240080012006003-phase
*Please see page 70 for more information about supply voltage

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