Memmert universal oven UF75, compact heating and drying oven with forced air circulation, 74 litres, up to 300 °C

Anyone who finds the smallest model in the forced-air series has reached its capacity limit will find the next size up in the Memmert universal oven UF75, which has almost the same footprint: 74 litres’ internal volume, a temperature range of 20 to 300 °C, and the same electronically controlled air turbine for active heat distribution. With up to 6 shelves instead of 4 compared to the smaller UF55, more batches can be run in parallel without the cabinet taking up noticeably more floor space in the laboratory; it is simply slightly taller.

Forced air circulation: greater capacity with the same footprint

The UF75’s air turbine, which can be electronically controlled in 10 % increments, actively distributes heat throughout the interior, rather than simply allowing it to rise, as is the case with a natural convection cabinet. As a result, the UF75 achieves its working temperature range from at least 10 °C above room temperature up to 300 °C with shorter heating-up times than the structurally identical natural convection model UN75, which, by contrast, starts operating from just 5 °C above room temperature. A DIN Class A Pt100 temperature sensor with 4-wire measurement ensures a setting accuracy of 0.1 °C up to 99.9 °C and 0.5 °C from 100 °C onwards, regardless of the load on the up to 6 shelves.

ControlCOCKPIT SingleDISPLAY and data acquisition

The UF75 is controlled via the ControlCOCKPIT SingleDISPLAY, an adaptive, multifunctional digital PID microprocessor controller with a high-resolution TFT colour graphics display. The following parameters can be adjusted: temperature in Celsius or Fahrenheit, the speed of the recirculation fan, the position of the exhaust air damper, the programme duration, as well as the time zone and summer/winter time. A digital countdown timer with target time can be set from 1 minute to 99 days; the SetpointWait function only starts the process time once the setpoint temperature has actually been reached. The data logger can be read out and managed via the Ethernet interface; a time-limited trial version of the AtmoCONTROL software is available for download.

Capacity and dimensions of the Memmert universal oven UF75

The interior measures 400 x 560 x 330 mm; the external dimensions of the cabinet are 585 x 944 x 514 mm, and the net weight is approximately 66 kg. Two electropolished stainless steel grid shelves are included as standard; up to six shelves can be fitted in total. 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 by deep-drawn ribbing, with protected, integrated 4-sided all-round heating; the housing is made of textured stainless steel with a fully galvanised sheet steel rear panel. The UF75 can be connected either to 230 V (approx. 2,500 W) or 115 V (approx. 1,800 W), in both cases at 50/60 Hz.

Selection guide: choosing the right size from the UF range

With eight sizes, the Memmert UF range covers an internal volume ranging from 53 to 1,060 litres. When choosing the right size, the key factors to consider, alongside the volume, are the footprint and the number of shelves required.

The UF75 is the obvious choice when the Memmert universal oven UF55 (53 litres) becomes too small for the sample volumes involved, but a significantly larger floor space is not yet available. Anyone who needs more volume with a larger floor space will find this in the Memmert universal oven UF110 (108 litres, more interior space, slightly larger footprint). You can find all sizes of the series in our climate chambers & incubators range.

Distinction: Forced air circulation versus natural convection, and TwinDISPLAY

Within the Memmert family of heating and drying ovens, the most important purchasing decision is whether to opt for forced air circulation or natural convection. Thanks to its air turbine, the UF75 achieves shorter heating times than the identically constructed Memmert universal oven UN75; however, for samples sensitive to dust or air movement, natural convection remains the more suitable choice. For unattended runs with redundant temperature monitoring, the Memmert universal oven UF75plus is available, featuring TwinDISPLAY, two Pt100 sensors, HeatBALANCE and AutoSAFETY. For those who require a smaller capacity, the Memmert universal oven UF55 offers a more compact alternative with the same footprint.

Safety according to DIN 12880 for unattended operation

In addition to the adjustable electronic temperature monitoring, the UF75 is fitted with a mechanical temperature limiter of protection class 1 according to DIN 12880, which switches off the heating when the temperature reaches approximately 20 °C above the maximum cabinet temperature. A self-diagnostic system assists with fault-finding, and three 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 distance of 15 cm from the wall and a minimum distance of 20 cm from the ceiling must be maintained; a minimum of 5 cm is sufficient on either side in relation to the wall or an adjacent unit. The unit may be installed 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 %, non-condensing. Electrically, the UF75 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 cleaned using standard laboratory cleaning products. As an electrical appliance, the UF75 is subject to the German Electrical and Electronic Equipment Act (ElektroG) at the end of its service life and must not be disposed of with household waste; see Regulatory information below.

Typical applications

With an internal volume of 74 litres and up to 6 shelves, the Memmert universal oven UF75 is suitable for laboratories that require slightly more capacity than the smallest UF model, without taking up any more floor space.

• Drying of laboratory glassware and medium-sized sample batches in routine operations
• Tempering, ageing and baking of material samples in multiple batches
• Testing and curing in quality assurance
• Material testing in the industrial manufacture of small components
• A second unit alongside a UF55, if additional shelves are required

Investment rationale: Equipment tailored to the specific purpose

The scope of delivery for the UF75 includes 2 electropolished stainless steel grid shelves; the oven is designed to accommodate up to 6 shelves. If you regularly use all levels, you should order additional grid shelves or perforated trays. A fully transparent glass door is available as an option for visual inspection without opening the door, as are interior lighting, an internal power socket and a reversible door hinge. If you wish to run unattended cycles with redundant temperature monitoring, opt for the Memmert universal oven UF75plus with TwinDISPLAY. A USB-to-Ethernet adapter and AtmoCONTROL software licences are available for continuous data logging. For pharmaceutical or standards-based applications, we arrange calibration, IQ/OQ/PQ and maintenance services, including DAkkS calibration on request.

Frequently asked questions before making a purchase

How many samples can the UF75 hold at any one time?
Two grid shelves are included as standard; up to six shelves are possible, each with a maximum load of 20 kg, for a total load of up to 120 kg.

Can I place the UF75 on a laboratory bench?
Yes, with a net weight of around 66 kg and a footprint of 585 x 514 mm, the UF75 is designed for use on a laboratory bench, provided that the bench can safely support the load.

How does the UF75 differ from the smaller UF55?
Both have the same footprint; the UF75 is taller and offers greater capacity, with 74 litres instead of 53 and 6 shelves instead of 4.

What is the accuracy of the temperature control?
The DIN Class A Pt100 sensor, using a 4-wire measurement, provides an accuracy of 0.1 °C up to 99.9 °C and 0.5 °C from 100 °C onwards.

Is a natural convection model available in this size?
Yes, the Memmert universal oven UN75 shares the same housing as the UF75, but operates without an air turbine and is suitable for samples that are sensitive to dust or air movement.

Is a TwinDISPLAY version available?
Yes, the Memmert universal oven UF75plus also features two redundant Pt100 sensors, HeatBALANCE and AutoSAFETY for unattended processes.

Is the UF75 suitable for continuous overnight operation?
The mechanical temperature limiter, of protection class 1 according to DIN 12880 switches the heater off at an excess temperature of approximately 20 °C and is designed for unattended operation.

Technical details

Scope of delivery

• 1x Memmert universal oven UF75
• Factory calibration certificate (calibration at 160 °C)
• Fully insulated stainless steel doors with a 2-point locking system (compression door lock)
• 2x stainless steel grid shelf, electropolished

Regulatory information

The Memmert universal oven UF75 is registered with the Stiftung Elektro-Altgeräte Register (Stiftung EAR) under WEEE registration number DE 66812464.

Individual requirements and procurement service

Accessories available for the UF75 include full-view glass doors, interior lighting and a power socket, a reversible door hinge, a wall bracket, a stacking kit and levelling feet. For data acquisition, a USB-to-Ethernet adapter and AtmoCONTROL software licences, including the AtmoCONTROL FDA version for 21 CFR Part 11, are available. In addition, we arrange calibration, IQ/OQ/PQ and maintenance services, including DAkkS calibration on request. Do you require any of these accessories, a TwinDISPLAY version, or assistance in selecting the right universal oven for your application? Through our procurement service, we are happy to assist you with procurement and configuration.