Product Description
The self-zeroing burette connects the reservoir, the refill channel, and the
graduated tube into a single body. Titrant is supplied from the upper reservoir,
so there is no need to pour and top up from outside; squeezing the bottle pushes
the liquid level back to the zero mark. The whole titration is controlled by the
micro-adjustment knob and the delivery button, keeping operation continuous and
the starting point of each reading consistent.
Self-Zeroing · No Re-Zeroing
With a conventional burette, the level must be reset to the zero mark after each
refill — time-consuming and a source of reading error. The self-zeroing design
returns the meniscus to zero automatically after refilling, so every titration
starts from the same baseline. This speeds up work and makes serial samples
easier to compare.
Operating Principle
- Refilling: Squeeze the reservoir; titrant flows through the inlet tube into the graduated body, and the meniscus returns to the zero mark.
- Fine delivery: Turn the micro-adjustment knob to control the opening of the delivery tip for dropwise or half-drop titration.
- Fast delivery: For quicker titration, release the knob while pressing the button to increase the flow rate.
- Reading: The black Schellbach stripe turns the meniscus into a fine line; read at eye level with the lowest point.
Design Features
- Integrated reservoir: The bottle connects directly to the tube, reducing transfer steps and the risk of titrant contamination.
- Schellbach stripe: A black band behind the tube uses optical backing to sharpen the meniscus for precise reading.
- Micro-adjustment knob: Fine travel allows steady, small-volume additions for confident endpoint detection.
- Stable base: The bottle is held in a base for a steady stand during titration.
- Clear graduations: Divisions down to 0.05mL meet routine volumetric-analysis reading needs.
Material & Construction
The tube is made of borosilicate glass 3.3, chemically resistant with a low
expansion coefficient. The inlet tube is PVC, the delivery tube is silicone,
the reservoir is PE-LD, the base is PE-HD, the sleeve is polyamide, and the
micro-adjustment knob is brass/PP. The titrant contacts mainly glass, silicone,
and PE-LD, avoiding unwanted reaction with the analytical solution.
Usage Tip: Before use, check that the knob and tubing move
freely and seal properly. Squeeze the bottle gently when refilling to avoid
overshooting the zero mark or trapping air. Deliver slowly with the knob first,
then switch to dropwise control near the endpoint. Rinse the tubing with distilled
water after use to keep the delivery tip free of crystallized residue.
