Memmert Vacuum Drying Oven VO29, 29 l, +20 to +200 °C, TwinDISPLAY

The Memmert Vacuum Drying Oven VO29 is the smallest size in the VO series. The interior holds 29 litres and measures 385 x 305 x 250 mm (W x H x D), the unit measures 550 x 607 x 400 mm externally, and the door handle adds 38 mm to the depth. At approx. 55 kg net weight, it is the lightest VO. The temperature is set between +20 and +200 °C, the pressure digitally between 5 and 1,100 mbar, and operation is via the TwinDISPLAY of the ControlCOCKPIT.

Loading: one thermal shelf instead of a shelf

The scope of delivery includes a thermal shelf made of aluminium (material 3.3547) with integrated large-area heating. It replaces the shelf that is otherwise usual. Up to 2 shelves are possible in total, each may be loaded with 20 kg, and the unit as a whole with 40 kg. There is a connection for the thermal shelf in the rear wall. The Premium module T5 can be selected as a factory option when ordering and includes, among other things, further thermal shelf connections (one for size 29).

The interior is hermetically sealed by welding and made of stainless steel 1.4404. A removable interior lining of the same material carries the support rails with tilt protection on the sides, and the ceiling lining serves against ventilation turbulence.

Direct heating and temperature control

Heating takes place in the thermal shelf itself. A fuzzy-assisted MLC microprocessor control (Multi-Level-Controlling) adapts the heating power to shelf and load quantity, and measurement is by a Pt100 in 4-wire technology directly at the shelf. The working temperature range begins at least 5 °C above room temperature and ends at +200 °C. The setting accuracy is 0.1 °C up to a setpoint temperature of 99.9 °C and 0.5 °C from 100 °C. Every supplied thermal shelf comes with a factory calibration certificate for +160 °C at 20 mbar.

Vacuum and pump connection

On the outlet side, the VO29 has a small flange DN16, plus a gas inlet with fresh air supply and a programmable, digitally controlled air inlet. The pipework in the suction and ventilation area is made of material 1.4571 (ASTM 316 Ti). The permissible ultimate vacuum of the oven is 0.01 mbar, and the maximum leak rate is 0.01 bar/h.

The vacuum pump is not part of the scope of delivery and is ordered separately. Memmert offers the chemically resistant 4-head diaphragm pump E07509 (approx. 50 Nl./min = 3.0 m³/h, 230 V). It runs with speed control, and the oven also outputs a pump ON/OFF signal and triggers demand-based flushing cycles of the pump diaphragms. Signal cable B39410 and connecting hose B04026 (3 m each) are required for this. As a noise-damping base cabinet there is the pump module PM29 (without pump, to hold the vacuum pump) or PMP29 (with built-in pump). Together with the base frame B63505, oven and pump module form a stacked unit with a total height of 1,650 mm. With the module with pump, signal cable and hose are not needed.

Programs, timer and interfaces

The TwinDISPLAY consists of two high-resolution TFT colour graphic displays. Settable are temperature (Celsius or Fahrenheit), pressure, program runtime, time zone and summer/winter time, and the menu language is selected from nine languages. The digital countdown clock runs from 1 minute to 99 days with target time indication. With SetpointWAIT, the process time begins only when the setpoint temperature has been reached. Programs are created, managed and transferred via Ethernet LAN or USB with the AtmoCONTROL software. The program sequence is saved in the event of a power failure.

Protection and installation

A mechanical temperature limiter of protection class 1 to DIN 12880 switches the heating off at approximately 10 °C above the maximum oven temperature. In addition, the AutoSAFETY protection ASF follows the setpoint at a freely selectable interval, reports exceeding and falling below visually and acoustically, and switches the heating off when exceeded. A self-diagnosis system supports troubleshooting of the temperature control. The door is built as a full-view glass door: spring-mounted safety glass of 15 mm thickness on the inside, and a splinter-protection pane on the outside.

Installation is at +5 to +40 °C ambient temperature and a maximum of 80 % relative humidity, non-condensing. A distance of 15 cm to the rear wall is to be observed, 20 cm to the ceiling and 8 cm at the sides. The unit is transported upright.

Selection guide: when the VO29 is enough

The VO29 fits if material to be dried and shelves fit within 385 x 305 x 250 mm and 20 kg per shelf is sufficient. The VO49 has the same internal width and the same external width of 550 mm, but offers 385 mm height and 330 mm depth, two thermal shelf connections from the factory and 60 kg unit load. Anyone who needs more height or depth switches to it. For even larger batches there is the series up to 101 litres, see size table below.

Typical applications

The VO29 dries under vacuum. Typical materials to be dried are food, cosmetics, granules, watches, books, printed circuit boards, electronic components and injection moulds.

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

Technical details

Other sizes in the series

The VO series comprises three sizes from 29 to 101 litres, all with TwinDISPLAY, sorted by internal volume:

Scope of delivery

• 1x Memmert Vacuum Drying Oven VO29
• 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, spring-mounted 15 mm thick safety glass on the inside, 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 VO29 are the Premium module T5 (including inert gas switching), the current interface V6 (4 to 20 mA, temperature of a Pt100 that can be freely positioned in the interior, price per sensor, only with T5), the potential-free contact H6 to NAMUR NE 28 for fault messages and MobileALERT C3 for alarm notification by SMS (requires H6). Accessories include additional thermal shelves made of anodised aluminium (B00741) or stainless steel 1.4404 (B00733), the vacuum pump E07509 with signal cable and hose, the pump module PM29 or PMP29 with base frame B63505, USB-Ethernet adapter, Ethernet cable (5 m), USB user ID stick and the FDA licence FDAQ1 for AtmoCONTROL FDA. Services range from factory calibration (+50, +100 and +160 °C at 20 mbar) and IQ/OQ documents to short training, maintenance and an on-site maintenance contract. For individual requirements, LT Laborhandel will advise you personally.