vi04Free-standing units - proven design for decades
Facilitate fast loading and removal


Universal basic versions for the microbiological standard laboratory for

  • Liquids, culture media
  • Solids such as instruments, glassware and devices
  • Waste

Safe and future-proof

  • Modules available for fast cooling, prevacuum and drying and for exhaust-air filtration with condensate sterilization
  • Direct and independent batch documentation
  • Newly developed fitting blocks without dead spaces ensure sterilization quality and eliminate problem zones when sterilizing waste
  • Abundant supply of accessories


One sterilizer with many advantages

  • No cheap compromises: Processes, measurements, fittings, stainless steel finishing and batch documentation compliant with DIN and industry standards
  • Fast closure - easy opening thanks to our Fingertip Quick Lock

The VARIOKLAV 75 S and 135 S steam sterilizers with their ultra-flat steam generators in their double bottoms combine the advantages of a double-walled device - low energy consumption, permanently ready for use, effective deaeration and drying by built-in jacket heater - with those of a single-wall device - fast cooling.

The chamber is free of furnishings and feed water and therefore easy to clean. The basic version features four sterilizing programs, two for liquids and one each for solids and for waste. Up to 16 programs can be stored by the control unit, depending on the modules and options installed. Up to eight pressure changes combined with effective steam flushing drive out the residual air from solids and waste, allowing faster heating by pulsating steam.


mischbeladungSafe and easy operation

  • Direct selection of your three most important programs
  • Extensive loading capacity of 75 and 135 litres
  • Minimum loading height of 750 and 800 mm
  • Two gas pressure springs equalize the weight of the lid
  • No feed water in the chamber, a great advantage during loading and unloading, low steam escape when lifting the lid
  • No heating elements in the chamber, no burning of agar


  • Ultra-narrow design, only 500 and 600 mm in width
  • Innovative thermolock pursuant to TRB 402 for liquids
  • Automatic spent-steam condensation
  • Versatile control unit, simple for operators and flexible for lab management

And after your purchase?

Benefit from fast batch processing, low operating cost thanks to efficient steam management.


The steam pressure on the lid is transferred with maximum safety to innumerably many points on the closing ring - not just to two positions as with clip locks
Two pressure sensors check for complete pressure release before the lid can be opened

Silicone seal movable by pressurized air:

  • uniform closing pressure, reliable seal
  • wedge-shaped profiles automatically retract the seal when the pressure is gone
  • long life




verschlussUnique Fingertip Quick Lock*
Never before has opening and closing a lid been so simple and convenient. When a button is pressed, a safety ring locks the lid. It is tensed pneumatically, circumferentially encloses the lid and places itself immovably inside the closing ring. A movable seal closes the sterilizing chamber, making it pressure-tight and vacuum-tight. * Design patent


Double bottom as steam generator
This ultra-flat double bottom rapidly generates steam - a new milestone in steam sterilizer technology. This gives the sterilizers an unusually compact design.



  • Steam generation and chamber are separated - stores heat and feed water, preheats the sterilizing chamber, collects and separates condensate and permits the drying of solids
  • No contamination of feed waters by drop condensates, waste, or culture media, leaving the sterile supplies free of deposits by impure steam
  • Minimum water volumes in the steam generator make economic use of heating energy and reduce the amount of water used for fast cooling
  • Water level control by exploiting the differences in heat conductivity between water and steam - no maintenance
  • Fast heating and effective deaeration through tangential steam entry

Fitting blocks: e.g. Floor Drain Valve*

Drain valve in the chamber floor eliminates dead spaces and thereby non-sterilizing zones, ensures a sterile condensate and prevents the spread of pathogens. The valve seat closes directly inside the sterilizer and can be steam-sterilized from all sides.

A chamber sensor for the condensate temperature is integrated in the valve (flow sensor) and measures the temperature in the coldest spot - in the disposal line.

Drain valve is heated by double bottom - preventing agar deposits 
*Patent pending

Universal feed water connector

  • Optionally suction from non-pressurized reservoir or feeding via demineralized water feed
  • Integrated pump equalizes all pressure variations in external supply lines
  • Automatic level control before, during and after the process ensures that the system is permanently ready for use


Schema für Doppelboden und verfügbare Module

Separate steam generator control
A comprehensive program package for chamber and steam generation that controls both pressure chambers separately offers extra versatility.


  • Preheating: Steam generator permanently ander pressure
  • More efficient air removal by faster pressure changes and shorter intervals, which is a great advantage especially when sterilizing waste in waste bags
  • Following sterilization, the chamber is free of condensate, which further reduces the amount of steam that escapes when the lid is opened and additionally helps avoid unpleasant odours when sterilizing waste
  • Shortens batch processing times by up to 30 %



verschluss2Opening aid
Opening aid actuated by pressurized air

  • Lid swings back on pressing a button
  • Raises lid by up to 60°


Aquastop at sterilizer water intake avoids water damage
and turns water supply lines off even in standby mode


Media temperature controlled timingvi000009
Product temperature is attained more quickly through controlled temperature increments. No overheating of medial, timer-controlled sterilizing times, includes flexible liquid sensor.

Further expansion options
Please notice the modules and the expansion options of the control unit.




Loading capacity 75 S 135 S
Round laboratory flasks (500 ml) 23 63-66
Round laboratory flasks (1.000 ml) 16-18 30
Round laboratory flasks (2.000 ml) 8 16
Square laboratory flasks (250 ml) 80 140
Square laboratory flasks (500 ml) 28 66
Erlenmeyer flasks (1.000 ml) 10 24
Solids   ca. 25 kg ca. 30 kg
Waste   ca. 25 kg ca. 30 kg



Control unit: Sterilizing parameter ranges  
ing temperature: 98 - 134 °C (target value)
Sterilizing time: 1 - 999 minutes
Removal temperature: 40 - 95 °C (thermolock)
Schlüsselschalter: For program configurations
Timer: Start of sterilizing cycle by date and time
Removal pressure: 105 - 120 kPa
Customized settings can be configured by manufacturer's customer service:
Temp. increase beyond target Up to +8 K in steam gener. during heating phase
Pressure changes: 0 - 8, adjustable
For more information see Technical Specifications datasheet




Composition of batch times*
Programmschritte Deaeration / Heating Sterilization Steam release
Cooling ST Fa
Fast cooling module
  Vakuum 121° / 134 °C   90 °C RM RO RG
Liquids (min) 15 - 45 20 / 10 - 30 - 110 15 - 60 10 - 45 10 - 50
Solids (min) 15 - 30 20 / 10 2 - 4 - - - -
Waste (min) 15 - 30 - / 15 4 - 8 - - -- -
* Load: empty and fully loaded Captions: ST= forced cooling RM = jacket cooling RO/RG = with fan



Technical data 75 S 135 S
External dimensions (WxDxH)

(mm) 500 x 650 x 1000 600 x 750 x 1050
Internal dimensions (ØxH) (mm) 400 x 600 500 x 700
Loading heigh (mm) 750 800
Usable volume (Litres) 75 135
Steam generator (water vol./ total vol.) (Litres) 4,0 / 6,0 5,0 / 8,0
Power requirement / Heat output (kW) 4,8 / 4,5* 7,8 / 7,5
Power / Supply frequency (V/Hz) 3N ~ 400 / 50* 3N ~ 400 / 50
Schnellverschluß ring quick lock ring quick lock
Weight (kg) 140 170
Material for pressure vessel 1.4571 DIN 17440 1.4571 DIN 17440
Standards DIN 58951-2 DIN 58951-2
Max. operating temperature (°C) 138 138
Max. operating pressure / vacuum (bar) 2,5 / -1 2,5 / -1
Mark of conformity / Notified body CE / 0036 CE / 0036
European Pressure Equipment Directive (Kategorie) II II
Order No. 22425 22525
* statt 4,5 kW = 3,0 kW für 230 V Anschluß



VARIOKLAV Steam Sterilizers Order No.
Media temperature controlled timing 24415
Separate steam generator control (preheating) 20029
Batch documentation, direct or independent 20061 and 20062
Fast liquid cooling (RM) 20034 (RO) 20041 or (RG) 20042
Prevacuum, simple and fractionated 20026 or 20027
Drying, in vacuum or in sterile air stream 20028, 20031 or 20040
Exhaust-air filtration with condensate sterilization 20068
Operation supply and spent steam removal
Sterile steam, spent steam condenser, aquastop, e.g. on request
Additional options
e.g. cooling with coiled tubing or air, stainless-steel cover,  sterile venting, higher sterilizing temperatures,  chamber extension / volume enlargement,  prion programs, additional sterilizing programs
Sterilization baskets, lifting jack for sterilization baskets,  bases, consumables on request