Memmert UF750plus Universal Oven, large-capacity heating and drying oven with forced circulation and TwinDISPLAY, 749 litres, up to 300 °C, on castors

The Memmert UF750plus universal oven is designed for large-volume batches with high demands on process reliability: 749 litres’ internal capacity, a temperature range of 20 to 300 °C, and the same electronically controlled air turbine as the base model, supplemented by TwinDISPLAY with two redundant Pt100 sensors. If one of the two sensors fails, the second automatically takes over, providing added safety during long, unattended runs with valuable or time-critical batches. Fitted with castors that can be locked in place, the cabinet – weighing around 217 kg – can be moved around the laboratory or production hall despite its size.

Circulating air with redundant temperature measurement

The UF750plus’s fan, which can be electronically controlled in 10 per cent increments, actively distributes heat throughout the large interior and reliably achieves the operating temperature range from at least 10 °C above room temperature up to 300 °C, even when fully loaded. Two DIN Class A Pt100 sensors in a 4-wire configuration monitor each other: if one sensor fails, the other takes over without the process having to be interrupted. The setting accuracy is 0.1 °C from 0 to 99.9 °C and 0.5 °C from 100 °C onwards. 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 UF750plus 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, for example to compensate for temperature differences caused by unevenly distributed loads. 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 connections of the Memmert UF750plus universal cabinet

The interior measures 1,040 x 1,200 x 600 mm and accommodates 2 electropolished stainless steel wire shelves as standard; up to 14 shelves are possible in total. A maximum total load of 300 kg and up to 30 kg per shelf are permitted. The external dimensions of the cabinet are 1,224 x 1,720 x 784 mm, and the net weight is approximately 217 kg, identical to that of the base model UF750. The interior consists of easy-to-clean stainless steel, reinforced by deep-drawn ribbing, with a protected, integrated 4-sided all-round heating system; the housing is made of textured stainless steel with a fully galvanised sheet steel rear panel. The UF750plus is connected to 400 V three-phase current and 3 x 230 V without a neutral conductor at 50/60 Hz, with a power consumption of around 7,000 W.

Selection guide: choosing the right size from the UF range

The Memmert UF range with forced air circulation is available in 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.

Within this range, the UF750plus marks the boundary to the very large format, featuring TwinDISPLAY for enhanced process reliability. Those requiring even greater capacity will find it in the Memmert UF1060plus universal cabinet, offering 1,060 litres whilst maintaining the same footprint. All sizes in this 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 and HeatBALANCE can save money with the identically constructed Memmert UF750 universal cabinet in the basic model with SingleDISPLAY. For samples sensitive to dust or air movement that cannot tolerate active air circulation, the Memmert UN750plus universal cabinet offers the same housing with natural convection instead of an air turbine, whilst retaining the TwinDISPLAY. A significantly more compact TwinDISPLAY model with an identical operating concept is the Memmert UF260plus universal cabinet with a capacity of 256 litres.

Safety in accordance with DIN 12880, enhanced by AutoSAFETY

In addition to adjustable electronic temperature monitoring and AutoSAFETY, the UF750plus 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 temperature selector monitor (Protection Class 3.1) or a temperature selector limiter (Protection Class 2). 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 certification mark.

Installation, operation and disposal

For operation, a minimum distance of 15 cm from the wall and a maximum distance of 20 cm from the ceiling must be maintained; a minimum distance of 5 cm from the wall or an adjacent unit on either side is sufficient. 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 cabinet is designed for overvoltage category II and pollution degree 2; it must only be transported in an upright position. Thanks to its castors, the UF750plus can still be moved within these specifications even after installation. As an electrical appliance, it 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 749 litres and redundant sensor technology, the Memmert UF750plus universal cabinet is suitable for large-volume heat treatment processes with heightened requirements for process reliability.

• Unattended drying and tempering of large batches overnight or at weekends
• Material testing in industrial manufacturing where documentation is required
• Curing and testing in quality assurance with a high volume of samples
• Heat treatment processes in science and research with long process times
• Centralised drying oven for multiple working groups with heightened safety requirements

Investment rationale: when TwinDISPLAY is worthwhile

The UF750plus is supplied with 2 electropolished stainless steel grids; the cabinet is designed to accommodate up to 14 trays. TwinDISPLAY is particularly worthwhile where processes run unattended overnight or at weekends and where a sensor failure would otherwise jeopardise the entire batch, or where there is a documentation requirement supported by AutoSAFETY protocols. Those who do not require this redundancy can save money by opting for the Memmert UF750 universal cabinet in its basic model, which is of identical construction. A fully transparent glass door is available as an option for visual inspection without opening the door, as is a programmable door lock with door-open detection and a potential-free alarm contact for connection to a building management system. For pharmaceutical or standards-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 temperature monitoring; the process does not need to be interrupted, providing an added safety feature during long, unattended runs.

What does the HeatBALANCE function do?
It adjusts the distribution of heating power between the upper and lower heating groups from -50 to +50 per cent, for example to compensate for temperature differences caused by uneven loading.

Is TwinDISPLAY worth it for routine operation?
For simple drying tasks during the day, SingleDISPLAY is usually sufficient. For unattended runs overnight or where documentation is required, the UF750plus is the safer choice compared to the Memmert UF750 universal oven.

How many shelves fit into the UF750plus?
Two wire shelves are included as standard; up to 14 trays, each with a maximum load of 30 kg, are possible, giving a total load capacity of up to 300 kg.

What power connection is required?
400 V three-phase current with 3 x 230 V without a neutral conductor at 50/60 Hz and a power consumption of approximately 7,000 W.

Is a natural convection version with TwinDISPLAY available?
Yes, the Memmert UN750plus universal cabinet shares the same housing as the UF750plus, but operates without a fan.

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 UF750plus.

Technical details

Contents of delivery

• 1x Memmert UF750plus 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 UF750plus universal cabinet is registered with the Stiftung Elektro-Altgeräte Register (Stiftung EAR) under WEEE registration number DE 66812464.

Customised requirements & procurement service

Options available for the UF750plus include fully transparent glass doors, interior lighting and a power socket, a gas-tight interior, a potential-free alarm contact, MobileALERT remote monitoring, 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 provide calibration, IQ/OQ/PQ and maintenance services, including those accredited by DAkkS. 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.