Welcome to my blog. My name is Darren. I own several rental properties in Western Australia. Once I had made the purchases, I discovered that several of the properties needed extensive work before I could rent them to tenants, so I had to hire construction contractors, plumbers, electricians, waste disposal experts and roofing experts to make sure the homes were in top condition. Once I had repaired the buildings, I contacted a letting agent who put them on the market for me. I learnt a lot from working with some many different businesses so I decided to start this blog to share everything I know.
The analytical balance is an important weighing instrument, particularly in the laboratory environment. This device can measure extremely small masses of samples, even to the sub-milligram units. On the other hand, the sensitivity of the analytical balance means that the accuracy and the precision of the instrument can be easily compromised. Accuracy refers to the correctness of the displayed measurement as compared to the real weight of the pertinent sample. Precision is the consistency of the results provided during sample weighing. Here are the common operator-influenced factors that affect the precision and accuracy of analytical balances and guidelines on avoiding them.
Ambient Conditions
The ambient environment or the conditions surrounding the analytical balance can cause significant deviations in the readings. Therefore, it is important to ensure that the device is placed on an area with minimal detrimental changes. Air in the form of drafts will cause shifts in the readings. Basically, if a breeze enters the analytical balance enclosure, it will exert some pressure on the sensitive pan and may be perceived as weight.
Therefore, you should not use the balance near the window or an AC vent. In addition, close the door before recording the results. This will also keep the dust out. Vibrations and shifts in the support base can affect readings, so place the instrument on a stable and level surface. Also, the samples can be affected by humidity and temperature. For accurate results, place the materials in a container within a desiccator at room temperature for acclimation.
Electrostatic Charge
Significant electrostatic charge can be generated by the sample to be weighed on the analytical balance. Generally, this happens when the materials come in contact with other surfaces such as the storage containers. If the samples are dry and non-conductive, the charge will be retained in the material. Consequently, an electromagnetic field will be created between the material and the analytical balance. This will interfere with the internal metallic components, causing a distortion of weight. You can avoid this type of error by placing a discharge ioniser beside the device. The ioniser will eliminate the charges and prevent the creation of a detrimental field.
General Housekeeping
Finally, you should have good housekeeping practices with regard to your laboratory analytical balance. The upkeep will prevent errors formed due to lack of cleanliness. If you want to measure liquids, ensure that the material is not spilt on the analytical pan. If some pours, wipe immediately with a dry cloth. Solid samples can be eliminated using a soft brush or special vacuum.
Also make sure you hire calibration services to regularly inspect and fix your scales.
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