Memmert Vacuum Drying Oven VO49, 49 l, +20 to +200 °C, TwinDISPLAY

With 49 litres of internal volume, the VO49 is the middle one of the three VO sizes. Compared with the VO29, the interior grows in height and depth to 385 x 385 x 330 mm, while the width stays the same. The housing measures 550 x 687 x 480 mm (door handle additional 38 mm) and weighs approx. 83 kg. The temperature can be set from +20 to +200 °C, and the pressure is controlled digitally in the range 5 to 1,100 mbar.

Two thermal shelf levels in the interior

The rear wall of the VO49 has two connections for thermal shelves, on the 1st and the 3rd level. One thermal shelf made of aluminium (material 3.3547, integrated large-area heating) is supplied. Each shelf is controlled individually: an MLC microprocessor control with fuzzy-assisted power adjustment according to load quantity, plus its own Pt100 in 4-wire measurement. A maximum of 2 shelves with 20 kg each and 60 kg for the whole unit are permitted.

The Premium module T5 can be selected as a factory option when ordering. For size 49 it contains inert gas switching, two further thermal shelf connections and an additional thermal shelf. Memmert supplies further shelves as accessories in anodised aluminium (B00743) or in stainless steel 1.4404 (B00734) for particularly corrosive materials.

Pressure control, air inlet and pump

The pressure can be controlled to a value between 5 and 1,100 mbar. The permissible ultimate vacuum of the oven is 0.01 mbar, and the maximum leak rate is 0.01 bar/h. Suction is via a small flange DN16, and ventilation via the gas inlet with fresh air supply, which opens in a programmable and digitally controlled way. Suction and ventilation lines are made of material 1.4571 (ASTM 316 Ti).

A pump is not included in the carton with the VO49. It is ordered as an accessory, for example the chemically resistant 4-head diaphragm pump E07509 with approx. 50 Nl./min (3.0 m³/h) at 230 V. The oven controls its speed, switches it ON and OFF via a signal output and triggers demand-based flushing cycles of the diaphragm. Signal cable B39410 and hose B04026 (3 m each) are additionally mandatory. The pump module PM49 (without pump) or PMP49 (with built-in pump) stands as a noise-damping base cabinet under the oven, and with the PMP49, signal cable and hose are not needed. Together with the base frame B63506, this gives a stacked unit of 1,650 mm height.

Control, timing and data paths

The ControlCOCKPIT works with an adaptive PID controller and two high-resolution TFT colour displays. Parameters such as temperature (Celsius or Fahrenheit), pressure and program runtime are settable, as are time zone and summer/winter time. The timer counts down from 1 minute to 99 days and states the target time, and SetpointWAIT shifts the start of timing to the moment when the setpoint temperature is reached. The setting accuracy is 0.1 °C up to a setpoint temperature of 99.9 °C, and 0.5 °C above that.

Programs can be written, managed and loaded onto the unit via Ethernet LAN or USB with the AtmoCONTROL software. The program sequence is saved in the event of a power failure. Two current interfaces are available as factory options: V3 outputs the actual temperature value from 0 to 210 °C as 4 to 20 mA, V6 the value of a Pt100 that can be freely positioned in the interior (both only with T5).

Protective devices and location

The mechanical temperature limiter (protection class 1, DIN 12880) disconnects the heating at approximately 10 °C above the maximum oven temperature. The AutoSAFETY protection ASF follows the setpoint at a freely selectable interval and triggers an optical and acoustic alarm when exceeded or fallen below, and additionally the heating shutdown when exceeded. The door consists of a full-view glass pane with spring-mounted 15 mm safety glass on the inside and a splinter-protection pane on the outside.

The location should be between +5 and +40 °C, and the humidity at most 80 %, non-condensing. At the sides 8 cm of space to the wall remain, 15 cm to the rear wall, 20 cm to the ceiling. During transport the oven must stand upright.

Choosing a size: VO29, VO49 or VO101

The VO29 offers 29 litres and one connection in the rear wall, at 40 kg unit load. It is sufficient if the load fits in 385 x 305 x 250 mm. The VO49 has 20 litres more internal volume and two connections. The VO101 reaches 545 x 465 x 400 mm interior at 710 mm external width and approx. 110 kg net weight, and the load capacity per shelf stays at 20 kg.

Typical applications

Vacuum drying is the job of this oven. Typical materials to be dried in the series are food, cosmetics, granules, watches, books, printed circuit boards, electronic components and injection moulds.

• Drying food and cosmetics under vacuum
• Drying powder and granules with vacuum cycles
• Drying printed circuit boards and electronic components
• Vacuum drying of watches, books and injection moulds

Technical details

Other sizes in the series

The three VO sizes differ in internal volume, while temperature and pressure range are the same:

Scope of delivery

• 1x Memmert Vacuum Drying Oven VO49
• 1 thermal shelf made of aluminium (material 3.3547) with integrated large-area heating
• Factory calibration certificate for +160 °C at 20 mbar pressure for every supplied thermal shelf
• Full-view glass door with spring-mounted 15 mm thick safety glass on the inside and splinter-protection pane on the outside

Regulatory information

The unit is an electrical device within the meaning of the German Electrical and Electronic Equipment Act (ElektroG). The WEEE registration number of the manufacturer Memmert GmbH + Co. KG is DE 66812464. Notes on returning old devices can be found on our page Environment and disposal.

Individual requirements and procurement service

Available as factory options for the VO49 are the Premium module T5, the current interfaces V3 and V6, the potential-free contact H6 (24 V/2 A, NAMUR NE 28) as well as MobileALERT C3 and C4. C3 reports every fault by SMS and requires H6, while C4 reports two alarm messages (temperature and vacuum) and requires T5 and H6. Accessories include pump E07509, signal cable, hose, pump module PM49 or PMP49, base frame B63506, additional thermal shelves, USB-Ethernet adapter, Ethernet cable, user ID stick and the FDA licence FDAQ1. Services include factory calibration, IQ/OQ documents, on-site qualification and calibration, short training as well as maintenance and a maintenance contract (minimum term 3 years). For your specific requirements, LT Laborhandel puts together equipment and quotation individually.