Memmert UF75 Universal Oven, 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 UF75 universal cabinet, 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 simultaneously 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 is electronically adjustable in 10 per cent increments, actively distributes heat throughout the interior, rather than simply allowing it to rise as in a natural convection oven. As a result, the UF75 achieves its operating 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 at just 5 °C above room temperature. A Pt100 temperature sensor of DIN Class A in a 4-wire configuration 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 graphic display. Settings include 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 UF75 universal chamber

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. Two electropolished stainless steel grids 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 each case 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 range from 53 to 1,060 litres. When selecting the appropriate size, the key factors – in addition to volume – are the footprint and the number of shelves required.

The UF75 is the obvious choice when the Memmert UF55 universal cabinet (53 litres) becomes too small for the sample volumes involved, but a significantly larger footprint is not yet available. Those requiring more volume with a larger footprint will find this in the Memmert UF110 universal cabinet (108 litres, more internal space, slightly larger footprint). You can find all sizes in this range in the LT Laborhandel range of climate chambers and incubators.

Key distinctions: forced air circulation versus natural convection, and TwinDISPLAY

Within the Memmert heating and drying cabinet range, the most important purchasing decision is between forced air circulation and natural convection. Thanks to its air turbine, the UF75 achieves shorter heating-up times than the structurally identical Memmert UN75 universal cabinet; 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 UF75plus universal oven is available, featuring TwinDISPLAY, two Pt100 sensors, HeatBALANCE and AutoSAFETY. Those who require less capacity will find the Memmert UF55 universal oven to be the more compact alternative with the same footprint.

Safety in accordance with DIN 12880 for unattended operation

In addition to adjustable electronic temperature monitoring, the UF75 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. 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 test 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 of 5 cm is sufficient on the sides relative to the wall or an adjacent unit. It 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 per cent, 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 maintained using standard laboratory cleaning products. As an electrical appliance, the UF75 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 applications

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

• Drying of laboratory glassware and medium-sized sample batches in routine operation
• Tempering, ageing and baking of material samples in multiple batches
• Testing and curing in quality assurance
• Material testing in the industrial manufacture of smaller components
• As a secondary unit alongside a UF55 when additional shelves are required

Investment rationale: Equipment tailored to the specific purpose

The UF75 is supplied with 2 electropolished stainless steel wire shelves; the cabinet is designed to accommodate up to 6 shelves. Users who regularly utilise all levels should order additional wire shelves or perforated sheets. 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. Those wishing to run unattended cycles with redundant temperature monitoring should opt for the Memmert UF75plus universal cabinet with TwinDISPLAY. A USB-to-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

How many samples can fit into the UF75 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.

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 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 with 4-wire measurement delivers an accuracy of 0.1 °C up to 99.9 °C and 0.5 °C from 100 °C.

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

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

Is the UF75 suitable for continuous overnight operation?
The mechanical temperature limiter, which complies with Protection Class 1 according to DIN 12880, switches off the heating system in the event of an overtemperature of approximately 20 °C and is designed for unattended operation.

Technical details

Contents of delivery

• 1x Memmert UF75 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 UF75 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 UF75 include fully glazed 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 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, a TwinDISPLAY version 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.