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Frequently asked questions for lab balance
What is balance readability?
What does the repeatability of a balance mean?
The ability of a weighing instrument to display corresponding results under constant testing conditions, when the same load is repeatedly placed onto the weighing pan in the same manner. In general, the standard deviation or the difference between the largest and the smallest result for a defined number of measurements is used to specify this quantity.
How is the stabilization time of a balance specified?
Stabilization time is the time between complete placement of an object / sample on the weighing pan and display of the final result. It can be influenced by setting the appropriate digital filter parameters.
How to clean a balance?
Balances made with PBT plastic parts are chemical resistant and can be cleaned using acetone. Balances that have plastic parts are made of ABS can be cleaned with a damp cloth soaked in water. Be sure to wipe the balance with a soft, dry cloth after cleaning.
What should be the optimal temperature in a lab?
Laboratory balances and scales from Sartorius can be used from 5 degrees up to 40 degrees. Most important is that the balance will have performed the internal adjustment for that environment temperature. If it changes, the balance need to be adjusted accordingly. Constant temperature is always preferred. Best to have the isoCAL set at automatic. This way the balance will always be fit for purpose.
How do you define the allowable tolerance of calibration weights?
Normally traceable calibrations weights are used. It is widespread, that weights regarding to the OIML R 111-1 are used, which are divided in different classes E1, E2, F1, F2 and M1-3 with their permissible errors.
How do you define the minimal weight of a balance?
The United States Pharmacopeia (USP) Chapter 41 does not reference minimum sample weight any longer, rather it defines repeatability and accuracy, which is of crucial importance to determine the operating range of a balance. So, the term minimum weight has been replaced with operating range minimum. An accuracy of 0.10% is used to calculate this figure.
Zero or tare a balance?
Taring means zeroing the display when the balance is loaded.
This function allows the weight readout of an empty container to be reset to zero and the net weight of a sample to be read after the container has been filled. A subtractive taring device reduces the available weighing capacity by the tare value.
Zero the device is only possible when the weighing pan is empty.