By World Health Organization
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Extra resources for Maintenance Manual for Laboratory Equipment 2ed
Sample text
Linear error. A difference showed when the balance is loaded in a successive manner, increasing the quantity of weight in equal magnitude until it reaches its maximum capacity and unloaded in an analogous process. The differences shown between the readings obtained and the arithmetic values corresponding to the weights used are interpreted as non-linearity. Linearity. Refers to the ability of a balance to perform accurate readings of weights throughout its weighing capacity . A graph showing weight compared to the weight indication on a perfectly linear balance should generate a straight line.
A balance is calibrated by using standard weights. Certified masses. Masses conforming to the tolerance defined by the certification bodies. The ASTM classes 1 to 4 standards are those most widely used and must be used (a compulsory reference) for performing the calibration routines. Exactitude. The sum of all the balance’s errors. This is called total error band. Hysteresis. The difference in the results when the load in the balance is increased or decreased. Lateral load. A balance’s ability to consistently read the value of masses, no matter where they are placed on the weighing scale.
ILLUSTRATION OF A BIOLOGICAL SAFETY CABINET PURPOSES OF THE EQUIPMENT The biological safety cabinet is used for the following: 1. To protect the worker from risks associated with the management of potentially infectious biological material. 2. To protect the sample being analyzed from becoming contaminated. 3. To protect the environment. The cabinets are used for routine work related to pathogens (parasites, bacteria, virus, fungus), cell culture and under very precise conditions, the management of toxic agents.
Maintenance Manual for Laboratory Equipment 2ed by World Health Organization
by Robert
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