Elma Elmasonic Select 300 Ultrasonic Bath with Heating, 27.5 Litre, 37 kHz, 1106995

Anyone who cleans large quantities of laboratory glassware, pipettes or small parts in the laboratory needs an ultrasonic bath that can be set up once and then reliably processes one batch after another. The Elma Elmasonic Select 300 meets this need with a tank volume of 27.5 litres and four programs that can be saved. Five ultrasonic modes, ranging from Eco to Degas, adapt the cleaning process to different levels of soiling and materials, without the need for a new unit for every application. The Select series is designed for research and development laboratories, pharmaceutical and industrial analytical laboratories, as well as for workshops, metalworking, watchmakers and jewellers.

Five modes for everyday laboratory use

The Select series offers five different operating modes: Eco, Sweep, Pulse, Dynamic and Degas. Eco stands for gentler cleaning of light soiling; Sweep distributes the acoustic field evenly across the entire tank and prevents standing waves; Pulse briefly increases peak power for stubborn residues. Degas degasses freshly prepared cleaning baths before the actual cleaning begins, as dissolved air in the medium weakens cavitation. The four programs that can be saved store pre-defined combinations of mode, temperature and time, so that recurring cleaning steps do not need to be reset each time.

Tank size for batch cleaning

With a total volume of 27.5 litres and a recommended working volume of 22 litres, the tank, with internal dimensions of 475 x 270 x 195 mm, can accommodate several beakers or an entire batch of laboratory glassware at once. The matching modular cleaning basket 300 (item no. 1113072) holds the items to be cleaned above the tank floor, whilst a stainless steel lid 150/300 (item no. 1111933) reduces evaporation and noise during operation. For temperature-sensitive cleaning media, a cooling coil (item no. 1037515) is also available for tank sizes 60 to 300. The G 3/8-inch drain connection makes it easier to change the cleaning medium between two batches without having to empty the tank by hand.

Operation and safety

The large illuminated display with membrane keys shows the current settings and confirms each input with an audible signal. For the Select series, Elma specifies a patented dry-run protection feature and a safety shut-off after 8 hours of continuous operation. The heating range is from 25 to 80 °C with a heating power of 1,200 W; the timer can be set digitally from 1 minute to 6 hours. The bath is made of stainless steel and is compatible with the aqueous cleaning concentrates commonly used in laboratories; however, the IP20 rating requires that the housing itself does not come into contact with splashing water.

Selection within the Elma product ranges

Elma divides its ultrasonic range into three series offering varying levels of ease of use. The Easy series operates with an analogue rotary knob and fixed time settings, without programs and without a Sweep or Degas function; this is sufficient for simple cleaning tasks on smaller benchtop units. The P-series additionally switches between 37 and 80 kHz and is designed for analytical and medical applications with higher demands for precision cleaning. The Select 300 falls between the two series in terms of operation, featuring a digital display and program memory, but with a fixed frequency of 37 kHz. We also offer Bandelin SONOREX ultrasonic baths; for laboratories already equipped with this range of units, this remains an option.

Cleaning cycle procedure

In practice, the cleaning medium is prepared and then degassed for a few minutes in degassing mode to ensure that subsequent cavitation is not inhibited by dissolved air. For the actual cleaning, depending on the degree of soiling, either ‘Sweep’ is used for an even effect throughout the entire tank, or ‘Pulse’ for more stubborn residues. Once the combination of mode, temperature and time has been set appropriately, it can be saved as one of the four programs and called up directly for the next similar batch. At the end of the working day, the medium is drained via the G 3/8-inch drain connection without having to empty the tank by hand. This allows a cleaning cycle to be repeated consistently, even if there are several days between two batches.

Typical applications

• Cleaning large batches of laboratory glassware in research and quality assurance
• Degassing of freshly prepared cleaning or rinsing baths prior to sensitive applications
• Component cleaning in workshops and metalworking
• Cleaning of watch and jewellery components in larger quantities

Technical details

Scope of delivery

• 1x Elma Elmasonic Select 300 ultrasonic bath
• Plastic lid
• Mains cable (2 m)
• Hose nozzle for the drain
• Operating instructions

The cleaning basket, stainless steel lid and cooling coil are not included in the scope of delivery and are available separately.

Regulatory information

The ultrasonic bath is an electrical and electronic device under the ElektroG. The manufacturer Elma Schmidbauer GmbH is registered with the WEEE number DE 45649814. The return of old appliances is described at Environment and disposal.

Individual requirements and procurement service

For the appropriate cleaning basket 300, the stainless steel lid or a cooling coil for sensitive cleaning media, please contact our procurement service.