Quality Control of Your Analytical Balance
Quality Control (QC) is an essential part of maintaining the reliability of an analytical balance. This guide gives a good overview of the steps you must take to maintain your balance at optimal performance. The key ingredients in QC includes daily calibration, verifying accuracy with external ASTM Class 1 weights monthly, maintaining log books, recertification of the Class 1 weights annually before the certification expires, and annual professional servicing. The guide goes on to explain the steps you can take to verify the accuracy of the balance as well as corrective action to take in case it fails the accuracy test. It also offers tips on handling Class 1 weights, certifiying and recertifiying the weights, and other similar pointers that will help you keep your balance working at peak performance.
For further information visit www.dnr.wi.gov.… Read the rest
Precision Scale to Help Calculate Swing Weight of a Baseball Bat
We’ve never had a good reason to feature sports on our blog before. But as they say (or don’t say!): Baseball’s time has come. Here is a very interesting discussion that explores the swing weight of a bat. The author frames in the problem thus: how is it that two bats of the same weight (within 0.2 oz of each other when weighed on a precision scale) have different apparent swing weights while two other bats of different weights (3 oz between the two) seem to have the same swing weight? Baseball fans am sure will find this fascinating. The short answer is the distribution of mass and the moment-of-inertia this causes. For the complete answer refer to the above link!
For further information visit www.kettering.edu.… Read the rest
Counting Scales for Election Ballot Auditing
Here is a novel use of counting scales. Election ballot auditing ensures the accuracy, reliability, and security of election results. In this paper from UC Berkeley, they suggest a method of using ballot based auditing using counting scales versus the more popular precinct-based auditing. The main attraction to to ballot based auditing is the greater degree of statistical confidence for any set number of ballots that are counted. The main drawback though is the inefficiency in locating a specific ballot for auditing. The earlier methods used serial numbers for indexing the ballots. Here they suggest a procedure that will use counting scales and ballot weight to index a stack of ballots. Early results from these experiments indicate that this method could be a practical alternative giving results that is both statistically significant as well as compatible with existing hardware.
For further information visit www.eecs.berkeley.edu.… Read the rest
Analytical Balance Requirements in Public Drinking Water Labs
Microbiological analysis of public drinking water is a critical task. The health and even the lives of millions of people depend on the purity of the water. Consequently labs and analysts that work at these facilities have stringent EPA certification and approval requirements as spelt out in this manual. One of the critical pieces of equipment in an analytical lab is the analytical balance. The manual clearly details the care, use, and maintenance of the balance: annual service contracts are compulsory; monthly calibration checks with certified calibration weights are mandatory. Also, the certified weights should comply to appropriate ASTM or NIST standards with supporting documentation.
For further information visit www.epa.ohio.gov.… Read the rest
Does Heat Impact Analytical Balance Readings?
Here is an interesting question posed by a Grade 9-12 student. Essentially she is inquiring about the impact that a hot crucible will have on the mass when weighed on an analytical balance. The answers through the Ask a Scientist service are all over the place. Some give a definite yes that the hot crucible will have an adverse impact on the readings due to the air currents generated by the heat. Others are not so sure. The sanest advice to the budding scientist was to try it out for herself and to observe the results.
For further information visit www.newton.dep.anl.gov.… Read the rest
Accuracy of the Analytical Balance is Critical for Accurate Data Collection
Earlier we’d blogged about quality standardization in waste water treatment facilities’ labs. This EPA handbook goes even deeper and provides you with guidelines for analytical quality control in the waste water labs. Note that the handbook is useful both for wastewater as well as for water labs. One particular area of concern is the care and maintenance of the analytical balance. This is important since the accuracy of all data in the analytical lab will depend on the accuracy of the balance. The handbook lists specific do’s and don’ts that will aid you in maintaining your balances. The information in this handbook is still valid even though the document is slightly dated (1979 to be precise). Thus, you will find mentions of the balance beam, the predecessor of the modern analytical balance. Those can be safely ignored unless you still have one of them in service!
For further information visit … Read the rest
How to Weight A Kiss with a Kern Precision Scale!
On the heels of our mustache weighing video we now bring you something better. The method to weigh a kiss using our Kern Precision Scales! These intrepid volunteers have donated their kisses and the Kern balance delivers the results right down to one-thousandth of a gram. Interesting observation: the weight of a kiss has no correlation to how much you weigh. Watch the video to find out more!… Read the rest
New Digital Platform Scale Performs Multiple Functions
A newly released family of Kern IKT digital touch screen platform scales now available from Tovatech performs multiple measuring and weighing functions in a single package. This versatile tool allows companies to reduce their scale “inventory” and associated maintenance costs by consolidating diverse measuring and weighing functions from recipe to animal weighing on a single unit. Fully 9 operating modes are accommodated.
Ease of use is another feature of the IKT digital platform scales, all equipped with stainless steel weighing plates, one of which can be used for suspending weighing. Maximum weighing capacity ranges from 3,100 to 151,000 grams. An intuitive backlit LCD digital touch screen measures 5.8 inches on the diagonal to clearly display the functions being performed. Examples include:
- A large keypad for easy input of text and values, also displaying the operator’s name
- A clear menu structure with keys labeled in plain text
- Visual and audible signal
Kern Precision Scales Can Weigh Mustaches Too!
Now is this one for all you mustachioed guys. Ever wonder how much your mustache weighs? Well, take a look at this hilarious video where 8 brave souls step up to sacrifice their mustache just so that it could be weighted on Kern Precision Scale. The winner weighed in at all of 0.325gms. That’s quite a lot of mustache! (This was part of a charity event promoting the fight against prostate cancer).… Read the rest
Precision Scales Plays Important Role in Waste Ash Testing
Precision scales have a myriad uses especially in the lab. Here is one such standard operating procedure (SOP) where it plays a critical role. The Paint Filter Liquids Test is performed on samples of waste ash to find out if they contain free liquids and to assess adherence to specific CFR and EPA norms. In the process of these tests measuring and weighing the mass of the ash is an important step which is where the precision scale comes in. As we have stressed elsewhere on our blog, the SOP also notes the importance of keeping the balance in calibration and verifying it daily.
For further information visit www.tva.gov.… Read the rest