In Stock
Burette, Automatic Zero
Integrated Automatic Overflow System: Precision-engineered with a specialized overflow tip and fire-fused jet that utilizes capillary action to align the liquid level instantly with the zero graduation, maximizing workflow efficiency in high-throughput environments.
High-Durability Borosilicate 3.3 Matrix: Fabricated with a low coefficient of linear expansion (3.3 x 10-6 K-1), ensuring the vessel maintains Class A/B volumetric tolerances even after repeated exposure to aggressive chemical reagents or thermal sterilization.
$8.46
Quick Answer: An automatic zero burette is a titration burette that fills from an attached reservoir and sets its liquid level to the zero mark by itself, with excess liquid overflowing back. It removes the manual step of adjusting the meniscus to zero before each titration.
How the Zero Sets Itself
In the usual design, the automatic zero burette is mounted on top of a reservoir bottle holding the titrant. Squeezing a rubber hand bellows pushes titrant up through a filling tube until it rises past the zero mark; when the pressure is released, the liquid above zero drains back through an overflow tip, leaving the meniscus exactly at zero. The titration then proceeds through a stopcock at the lower end, as with an ordinary burette.
The arrangement saves the most time where one titrant is used many times in a session: routine alkalinity or hardness checks in a water laboratory, quality-control titrations in a factory laboratory, or a class running repeated trials. Keeping the titrant in a closed reservoir also protects it, and a soda-lime guard tube on the air inlet stops sodium hydroxide solution from absorbing carbon dioxide.
The stopcock type, capacity and graduation interval are not given in the title. They should be confirmed when ordering, together with whether the reservoir bottle and bellows come as part of the set.
Specifications
| Item | Burette with automatic zero-setting overflow |
| Filling | From a reservoir, usually by hand bellows |
| Zero setting | Excess liquid drains back through an overflow tip |
| Delivery | Stopcock at the lower end, as on a standard burette |
| Protective fitting | Guard tube on the air inlet is common for carbon-dioxide-sensitive titrants |
| Capacity, graduation and reservoir size | Confirm at enquiry |
Care & Handling
- Refill the reservoir only with the same standardised solution; mixing old and new batches changes the concentration.
- Restandardise the titrant in the reservoir at regular intervals, because solutions drift over time.
- Move the burette and reservoir as one assembly, supporting the reservoir from beneath.
- Drain and rinse the whole system with distilled water before changing to a different titrant.
Applications
- Repeated acid-base titrations with one standard solution through a whole practical session
- Routine water-testing titrations such as total hardness or alkalinity
- Quality-control titrations in which many samples are analysed with the same reagent
- Storing and dispensing sodium hydroxide titrant protected from air
Why Choose LabEquip
Water-testing laboratories, college analytical labs and industrial QC rooms choose automatic zero burettes when they titrate many samples a day with one reagent. LabEquip lists it with conventional burettes such as the PTFE key burette in the chemistry lab equipment range; send your required capacity through the contact page.
Frequently Asked Questions
How is an automatic zero burette different from an ordinary burette?
An ordinary burette is filled from the top with a funnel and the meniscus is brought to zero by hand. An automatic zero burette fills from a reservoir and overflows to the zero mark by itself, so each titration starts from the same point without manual adjustment.
Does automatic zeroing make the titration more accurate?
It removes one reading error, the initial zero setting, and makes the starting point consistent between titrations. The final reading is still taken by eye at the bottom of the meniscus, so good reading technique is still needed.
Why fit a guard tube to the reservoir?
As liquid is withdrawn, air enters the reservoir. With sodium hydroxide or barium hydroxide solutions, carbon dioxide in that air slowly converts some of the alkali to carbonate. A soda-lime guard tube on the air inlet absorbs the carbon dioxide.
Can volatile or light-sensitive titrants be used?
Volatile solvents are poorly suited, because vapour builds up in the reservoir and upsets the filling. Light-sensitive titrants such as silver nitrate can be used if the reservoir is amber or shielded from light.
How do I remove an air bubble from the tip?
Open the stopcock fully for a moment with a beaker underneath so the rush of liquid carries the bubble out, then refill to zero. A bubble left in the tip gives a falsely high titre when it escapes during the titration.
What should be checked before the first titration of the day?
Check that the overflow tip is clear, that the stopcock does not leak, and that the reservoir holds enough standardised solution for the session. Run one filling cycle to waste to flush the tubes with fresh titrant.
Last Updated: September 2026
You must be logged in to post a review.
Bestsellers
Reviews
There are no reviews yet.