Brand Dispensette S Organic Bottle-Top Dispenser, Digital, 5-50 ml, with Recirculation Valve, DE-M, 4630361

When transferring larger quantities of organic solvents from the reservoir bottle, excess should not end up in the waste. The Brand Dispensette S Organic Digital with recirculation valve (5 to 50 ml) can be primed without reagent loss, excess volume returns via the recirculation tube. At 5-50 ml, the graduation is 0.2 ml, the accuracy is 0.5 %/250 µl, the coefficient of variation is 0.1 %/50 µl.

Typical applications

The yellow colour code identifies the Organic series in the Brand range. In practice, for 5-50 ml these include among others:

• Priming before transferring larger quantities of organic solvent, without reagent loss
• Dispensing dichloromethane in extraction steps with recirculation of excess volume
• Adding concentrated hydrochloric acid in digestion procedures with subsequent loss-free replenishment

Digital version and selection guide

The volume is set via the volume setting wheel with a mechanical counter and can be quickly readjusted between individual dispensing steps. Digital instruments are adjustable without tools via Easy Calibration. Matching bottle adapters for GL 32-33, GL 38, S 40 are included, the filling tube can be adjusted to 170-330 mm.

When transferring larger quantities of expensive solvents, the recirculation valve pays for itself through loss-free priming. For inexpensive routine media in the same range, the version without a recirculation valve is sufficient.

Materials and autoclavability

Wetted parts consist of borosilicate glass, Al2O3 ceramic, ETFE, FEP, PFA, PTFE, tantalum, PP (screw cap/bottle adapter). The instrument is autoclavable under the following conditions: yes, 121 °C, 2 bar, at least 15 minutes according to DIN EN 285, cooling time approx. 2 hours in the closed autoclave. Tantalum as valve spring material, together with the fluoroplastics ETFE, FEP, PFA and PTFE, makes the Organic series suitable for organic solvents and several concentrated acids, but not for alkalis and salt solutions.

The Dispensette S Organic is not suitable for alkalis, salt solutions, carbon disulfide, explosive liquids and media that attack borosilicate glass such as hydrofluoric acid. For alkalis and salt solutions, the Dispensette S in red (Standard) is the appropriate series, for trace analysis with a selectable valve spring made of platinum-iridium or tantalum, the Dispensette S Trace Analysis.

Assembly and changing to another reservoir bottle are carried out using the supplied mounting tool and the telescopic filling tube, which can be adjusted to the respective bottle height. The bottle adapter included in the scope of delivery fits the respective GL45-compatible thread and makes the dispenser usable independently of the specific reservoir bottle.

Accuracy at a glance

For 5-50 ml: graduation 0.2 ml, accuracy 0.5 %/250 µl, coefficient of variation 0.1 %/50 µl. The abbreviation DE-M in the name confirms calibration according to the requirements of the German Weights and Measures Act.

Other volumes in the Digital version

In addition to 5-50 ml, the Digital version of the Dispensette S Organic covers further ranges:

Frequently asked questions

What is the recirculation valve used for?
It allows priming of the dispensing system before the first use without reagent loss: air and excess volume return via the recirculation tube into the reservoir bottle instead of into the waste. This is particularly relevant with expensive or environmentally relevant solvents.

How is the Digital version in the 5-50 ml range adjusted?
Easy Calibration makes this possible without tools, an adjustment deviating from the factory setting is made visible by a red mark.

Technical details

Scope of delivery

• 1 Dispensette S Organic bottle-top dispenser for GL45 threaded bottles
• Dispensing cannula with recirculation valve, including recirculation tube
• Telescopic filling tube
• Mounting tool
• Bottle adapters suitable for the volume range
• Quality certificate
• Operating manual

Differentiation within the Dispensette S family

Those who, as here, work with organic solvents or concentrated hydrochloric acid and nitric acid are right with the yellow Organic series, not with the red standard Dispensette S. For trace analysis with a selectable valve spring made of platinum-iridium or tantalum, the Dispensette S Trace Analysis is available separately.

Individual requirements & procurement service

For suitable bottle adapters, spare parts such as valves or filling tubes as well as for further volume ranges from the Dispensette S Organic series, LT Laborhandel provides support via its own procurement service at lt-laborhandel.com/service.