Memmert UF75plus Universal Oven, compact heating and drying oven with forced convection and TwinDISPLAY, 74 litres, up to 300 °C

For those who wish to benefit from the process reliability of TwinDISPLAY without immediately investing in a larger model, the Memmert UF75plus universal cabinet offers a compact solution: 74 litres’ internal volume, a temperature range of 20 to 300 °C, and two redundant Pt100 sensors that monitor each other. If one sensor fails, the second automatically takes over – a safety feature that is otherwise only standard in significantly larger cabinets. With up to 6 shelves and a maximum total load of 120 kg, the UF75plus remains compact enough for the laboratory bench.

Forced-air circulation with redundant temperature measurement in a compact design

The UF75plus’s fan, which can be controlled electronically in 10 per cent increments, actively distributes heat throughout the interior and achieves an operating temperature range from at least 10 °C above room temperature up to 300 °C. Two DIN Class A Pt100 sensors in a 4-wire configuration monitor each other and ensure a setting accuracy of 0.1 °C up to 99.9 °C and 0.5 °C from 100 °C onwards, even if one of the two sensors fails. Preheated fresh air is introduced via an electronically adjustable exhaust air damper; the exhaust air outlet with throttle valve can also be controlled electronically.

ControlCOCKPIT TwinDISPLAY: HeatBALANCE and AutoSAFETY

The UF75plus is controlled via the ControlCOCKPIT TwinDISPLAY, which features two high-resolution TFT colour graphic displays. The HeatBALANCE function allows for fine-tuning of the heat output distribution between the upper and lower heating groups from -50 to +50 per cent. AutoSAFETY also monitors over- and under-temperature conditions, automatically tracks the setpoint within a freely selectable tolerance range, and triggers visual and audible alarms in the event of a deviation; if the setpoint is exceeded, the heating system switches off. Programmes are programmed, managed and transferred via the Ethernet interface or USB port using the AtmoCONTROL software. A programmable door lock and a door-open detection feature can be added as options – functions that are exclusive to TwinDISPLAY units.

Capacity and dimensions of the Memmert UF75plus universal cabinet

The interior measures 400 x 560 x 330 mm; the external dimensions of the housing are 585 x 944 x 514 mm, and the net weight is approximately 66 kg, identical to the base model UF75. Two electropolished stainless steel wire shelves are included as standard; a total of up to six shelves can be fitted. The maximum total load is 120 kg, with a maximum of 20 kg per shelf. The interior consists of easy-to-clean stainless steel, reinforced with deep-drawn ribbing and featuring integrated, protected 4-sided all-round heating, whilst the housing is made of textured stainless steel with a fully galvanised sheet steel rear panel. The UF75plus can be connected either to 230 V (approx. 2,500 W) or 115 V (approx. 1,800 W), in each case at 50/60 Hz.

Selection guide: choosing the right size from the UF range

The Memmert UF range with forced air circulation covers eight sizes with internal volumes ranging from 53 to 1,060 litres, each also available with TwinDISPLAY. When selecting the appropriate size, the key factors – in addition to the volume – are the footprint and the number of shelves required.

The UF75plus is the obvious choice when the Memmert UF55plus universal cabinet (53 litres) reaches its capacity limit, but you still wish to use TwinDISPLAY. Those requiring more volume will find it in the Memmert UF110plus universal cabinet (108 litres). All sizes in the range can be found in the LT Laborhandel range of climate cabinets and incubators.

Key differences: TwinDISPLAY versus SingleDISPLAY, and natural convection

Those who can do without sensor redundancy can save money with the identically constructed Memmert UF75 universal cabinet in the basic model with SingleDISPLAY. For samples sensitive to dust or air movement that cannot tolerate active air circulation, the Memmert UN75plus universal cabinet offers the same housing with natural convection instead of an air turbine, whilst still featuring TwinDISPLAY. Those requiring less internal volume will find the Memmert UF55plus universal cabinet, a more compact TwinDISPLAY model with the same footprint.

Safety in accordance with DIN 12880, enhanced by AutoSAFETY

In addition to adjustable electronic temperature monitoring and AutoSAFETY, the UF75plus features a mechanical temperature limiter of protection class 1 in accordance with DIN 12880, which switches off the heating when the temperature reaches approximately 20 °C above the maximum cabinet temperature. The display also allows you to select either a protection class 3.1 temperature selector monitor or a protection class 2 temperature selector limiter. An integrated self-diagnostic system assists with fault-finding, and 3 freely selectable temperature values can be calibrated. The unit bears CE and EAC markings as well as a UL mark.

Installation, operation and disposal

For operation, a minimum clearance of 15 cm from the wall and a maximum clearance of 20 cm from the ceiling must be maintained; a minimum of 5 cm is sufficient on the sides relative to the wall or an adjacent unit. Installation is permitted at altitudes of up to 2,000 m above sea level at an ambient temperature of 5 °C to 40 °C and a relative humidity of no more than 80 per cent, non-condensing. Electrically, the UF75plus is designed for overvoltage category II and pollution degree 2; it must only be transported in an upright position. The interior, made of easy-to-clean stainless steel, can be maintained using standard laboratory cleaning products. As an electrical appliance, the UF75plus is subject to the Electrical and Electronic Equipment Act at the end of its service life and must not be disposed of with household waste; see Regulatory Information below.

Typical areas of application

With an internal volume of 74 litres and redundant sensor technology, the Memmert UF75plus universal cabinet is suitable for compact laboratory workstations with heightened requirements for process reliability.

• Unattended overnight drying of small to medium-sized batches
• Tempering, ageing and baking of material samples requiring documentation
• Testing and curing in quality assurance
• Time-critical sample preparation requiring high reliability
• An entry-level option for TwinDISPLAY equipment without requiring significant space

Investment rationale: when TwinDISPLAY is worthwhile

The UF75plus is supplied with 2 electropolished stainless steel grids; the cabinet is designed to accommodate up to 6 inserts. TwinDISPLAY is particularly worthwhile where processes run unattended overnight and a sensor failure would jeopardise the batch. Those who do not require this redundancy can save money with the identical Memmert UF75 universal cabinet in its basic model. A full-view glass door is available as an option for visual inspection without opening the door, as is a programmable door lock with door-open detection. A USB-Ethernet adapter and AtmoCONTROL software licences are available for continuous logging. For pharmaceutical or standard-compliant applications, we arrange calibration, IQ/OQ/PQ and maintenance services, including those accredited by DAkkS.

Frequently asked questions before purchase

What are the specific benefits of the second Pt100 sensor?
If one sensor fails, the second one automatically takes over its function, providing an added safety feature compared to the single-sensor system of the SingleDISPLAY base model.

How many samples can fit into the UF75plus at the same time?
Two wire racks are included as standard; up to six inserts, each with a maximum load of 20 kg, are possible, giving a total load capacity of up to 120 kg.

Is TwinDISPLAY worth it for this size?
For simple drying tasks during the day, the SingleDISPLAY is usually sufficient. For unattended overnight runs, the UF75plus is the safer choice compared to the Memmert UF75 universal oven.

What is the accuracy of the temperature control?
The two redundant Pt100 sensors, compliant with DIN Class A in 4-wire measurement, achieve an accuracy of 0.1 °C up to 99.9 °C and 0.5 °C from 100 °C.

Can I place the UF75plus on a laboratory bench?
Yes, with a net weight of around 66 kg and a footprint of 585 x 514 mm, the UF75plus is designed for use on a laboratory bench, provided that the bench can safely support the load.

Is a natural convection version with TwinDISPLAY available?
Yes, the Memmert UN75plus universal cabinet shares the same housing as the UF75plus, but operates without an air turbine.

Is a programmable door lock available?
Yes, a programmable door lock and door-open detection are options available exclusively for TwinDISPLAY units such as the UF75plus.

How does the UF75plus differ from the smaller UF55plus?
Both operate with TwinDISPLAY and two redundant Pt100 sensors; the UF75plus offers greater capacity – 74 litres instead of 53, and 6 shelves instead of 4 – whilst occupying the same floor space.

Technical details

Contents of delivery

• 1x Memmert UF75plus universal cabinet
• Factory calibration certificate (calibration at 160 °C)
• Fully insulated stainless steel doors with 2-point locking (compression door seal)
• 2x stainless steel grating, electropolished

Regulatory information

The Memmert UF75plus universal cabinet is registered with the Stiftung Elektro-Altgeräte Register (Stiftung EAR) under WEEE registration number DE 66812464.

Customised requirements & procurement service

Optional extras available for the UF75plus include fully transparent glass doors, interior lighting and a power socket, a reversible door hinge, a potential-free alarm contact and a USB user ID stick for TwinDISPLAY user rights. For data acquisition, a USB-to-Ethernet adapter and AtmoCONTROL software licences – including an FDA-compliant version – are available. In addition, we arrange calibration, IQ/OQ/PQ and maintenance services, some of which are DAkkS-accredited. Do you require any of these accessories or assistance in selecting the right universal cabinet for your application? Through our procurement service, LT Laborhandel will be happy to assist you with procurement and configuration.