Brand Titrette Bottle-Top Burette, 25 ml, DE-M, 4760151

With 25 ml, the Titrette covers the volume most often required in titration practice. The bottle-top burette screws directly onto the GL45 supply bottle and handles dispensing and display digitally, instead of draining the standard solution via a separate glass burette with a stopcock.

Counter instead of meniscus reading

The dispensed value appears as a number on the display, not as a line on a glass scale. This removes the usual source of error when reading the meniscus, especially with coloured or turbid titration solutions where the scale is hard to see.

Error limits of the 25 ml version

For 25 ml, Brand specifies an accuracy of 0.07 percent or 18 µl and a coefficient of variation of 0.025 percent or 6 µl. These values match the error limits stated in the instructions for use for this volume range.

Typical applications

• Volumetric titrations in routine quality control
• Recurring titrations with constant volume requirement, for example acid-base or redox titrations
• Workstations with several titration bottles, where each bottle carries its own Titrette
• Training establishments where a digital counter makes handling the burette easier

Selection guide: which volume for which titration

With 25 ml, this version covers the range needed most often in practice, between the fine 10 ml range for small consumption quantities and the 50 ml range for series with high demand. Accuracy 0.07 percent or 18 µl and coefficient of variation 0.025 percent or 6 µl lie between the two other volume ranges. Anyone who does not want to read the consumption value manually but pass it directly to a LIMS or an Excel spreadsheet will also find the same 25 ml range with an RS232 interface in the product range.

Titrette compared with glass burette and Dispensette

A class A glass burette requires reading the meniscus on a printed scale, the Titrette shows the same value digitally on the counter, and both are operated manually. Compared with a Dispensette, the difference lies in the purpose: the Dispensette repeatedly dispenses a fixed, preselected volume, the Titrette sums the consumption during a single titration up to the colour or potential change.

Technical details

Application and maintenance

The Titrette screws directly onto the supply bottle of the standard solution via one of the three supplied PP bottle adapters (GL 32, S 40, NS 29/32), and the telescopic filling tube can be adjusted to bottle heights between 170 and 330 mm. Before first use and after every bottle change, the system must be primed like any piston burette so that no air bubble in the cylinder impairs dosing accuracy. The recirculation tube allows standard solution dispensed in excess by mistake to be returned to the bottle instead of starting the titration anew. Two amber-tinted light protection windows protect light-sensitive standard solutions without requiring the bottle to be completely covered. The counter is operated by two type AAA/UM4/LR03 micro batteries, which can be replaced without tools as soon as the display signals low battery voltage. A mains connection is not required, and the device remains ready for use even at workstations without a power socket.

Scope of delivery

• Titrette bottle-top burette for GL45 threaded bottles
• DE-M marked
• Quality certificate
• Telescopic filling tube, 170 to 330 mm
• Recirculation tube
• 2 micro batteries (AAA/UM4/LR03)
• 3 PP bottle adapters (GL 32, S 40, NS 29/32)
• 2 amber-tinted light protection windows

Frequently asked questions

• What does the DE-M marking on the Titrette mean? DE-M is the German verification mark under the Weights and Measures Act, it identifies the device as suitable for applications requiring official verification.
• How accurately does the Titrette 25 ml dispense? Accuracy 0.07 percent or 18 µl, coefficient of variation 0.025 percent or 6 µl, according to the manufacturer.
• Which bottle thread fits the Titrette? GL45 directly, plus GL 32, S 40 and NS 29/32 via the supplied PP adapters.
• What is included in the scope of delivery? The Titrette itself, telescopic filling tube, recirculation tube, three bottle adapters, two micro batteries and a quality certificate.
• What happens if I accidentally dispense too much standard solution? The excess amount can be returned to the supply bottle via the supplied recirculation tube without starting the titration anew.

Individual requirements & procurement service

Suitable bottle adapters, replacement filling tubes or further accessories for the Titrette series can be requested via the procurement service of LT Laborhandel. Contact via lt-laborhandel.com/service.