Ensuring Long-Term Accuracy and Analytical Quality from a Laboratory Balance
6 May 2019
Choosing the correct weighing equipment is an essential part of ensuring lab analytical quality. The Good Weighing Practice (GWP) from METTLER TOLEDO provides a framework designed to find the right balance based on process analysis.
While expanding the parameters for balance selection may seem daunting, the GWP is a standardised scientific methodology offering a framework for the secure selection of weighing equipment based on a thorough analysis of the process.
Although maximum load, readability, and price are important considerations when choosing a balance, there are additional parameters to consider that affect whether or not a balance is going to meet the needs of a specific process. Taking the time to do so is important because quite a few models will typically satisfy maximum load and readability needs.
Additionally, while the budget is definitely a consideration for most labs, choosing the least expensive balance now may actually result in a hefty price tag down the line. This is because if accuracy cannot be obtained or maintained, or the balance fails at inopportune times, quality and productivity will suffer.
Factors worthy of consideration include:
• Smallest net weight—the smallest weight to be weighed in the process, and the minimum weight of the balance. • Required accuracy—the upper limit of the allowable measurement uncertainty of the balance. • Environmental conditions— where the balance will be operated. • Weighing application—additional process requirements may influence desirable balance properties.