Brand Dispensette S Organic Bottle-Top Dispenser, Analog, 1-10 ml, with recirculation valve, DE-M, 4630141

In standardised digestion procedures with concentrated nitric acid, daily venting should not cost any reagent. The Brand Dispensette S Organic Analog with recirculation valve (1 to 10 ml) returns excess volume to the reservoir bottle instead of discarding it via the dispensing cannula. At 1-10 ml the graduation is 0.2 ml, the accuracy is 0.5 %/50 µl and the coefficient of variation is 0.1 %/10 µl.

Typical applications

The yellow colour code identifies the Organic series in the Brand range. For 1-10 ml, in practice these include:

• Venting before standardised digestion with concentrated nitric acid, without reagent loss
• recurring dichloromethane addition, with excess volume returned
• fixed THF dispensing in synthesis, with refilling without loss

Analogue version and selection guide

The volume is set using the volume adjustment screw with indicator arrow: loosen the screw by three quarters of a turn, slide the indicator arrow to the scale value, and tighten the screw again. Once set, the value stays until deliberately changed. Analogue devices can be adjusted without tools via Easy Calibration. Matching bottle adapters for GL 24-25, GL28/S 28, GL 32-33, GL 38, S 40 are included, and the filling tube can be adjusted to 125-240 mm.

With a fixed but expensive acid volume in routine work, the recirculation valve pays off when venting. For inexpensive media, the version without RV is sufficient.

Materials and autoclavability

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

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

Assembly and changing to a different reservoir bottle are done with 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 regardless of the specific reservoir bottle.

Accuracy at a glance

For 1-10 ml: graduation 0.2 ml, accuracy 0.5 %/50 µl, coefficient of variation 0.1 %/10 µl. DE-M in the product name stands for factory calibration in accordance with German weights and measures law.

Other volumes in the analogue version

If you need a range other than 1-10 ml, you will find it within the analogue version of the Dispensette S Organic:

Frequently asked questions

What is the recirculation valve needed for?
It allows the dispensing system to be vented before first use without losing any reagent: air and excess volume go back into the reservoir bottle via the recirculation tube instead of into waste. This is particularly relevant with expensive or environmentally relevant solvents.

How is the analogue version adjusted in the 1-10 ml range?
With Easy Calibration this can be done without additional tools; a changed factory adjustment is shown by a red marking.

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 adapter matching the volume range
• Quality certificate
• Operating manual

Distinction within the Dispensette S family

Yellow colour code means: suitable for organic solvents and for concentrated hydrochloric acid and nitric acid. For alkaline solutions and the other acids, the red standard Dispensette S still applies. For trace analysis with a selectable valve spring of platinum-iridium or tantalum, the Dispensette S Trace Analysis is available separately.

Individual requirements & procurement service

LT Laborhandel provides support via its own procurement service (lt-laborhandel.com/service) with suitable bottle adapters, spare parts and further volume ranges of this series.