Laboratory Of Analytical Balance And Usage Instructions

Scales/Balances

The scales that are used in the laboratory consists of an assortment of types or brands. An important note is the capacity and accuracy of the scales-scales to be used i.e. does the rough scales/technical, medium or fine. Smooth scales have the precision to 0.1 mg even 1 microgram = 0.001 mg.

Types of scales which will be used depending on the purpose, for example for the determination of moisture content or grey analytic balance sheets must be used with an accuracy of 0.1 mg, is to weigh chemicals that will be made into a saturated solution of simply using the scales are more rugged.

Some important instructions in using scales, namely:

1. Sit squarely facing the scales to avoid reading errors.
2. Check the scales are working well or not.
3. Please check the position of the scales (flat water), zero attitude also demonstrated a tool penunjuknya. Arrange the circumstances when it is not appropriate.
4. Avoid weighing the ingredients are hot (if possible).
5. Do not weigh the ingredients or khemikalia directly above the pan penimbang, but use a suitable container such as a watch glass, bottle, glass, weigh the Crucible a small cup, paper.

Tools container should be clean and dried in the oven to 110 degrees Celsius then cooled at room temperature for 15 minutes eksikator dala similarly when will weigh something that hot should be refrigerated in advance in a way that the same.

• For considering use of the tools used to put or take the container to weigh ingredients, son of scales and others never directly held by hand. These tools can be a pincers, tweezers to put or take a container, while for chemicals can be taken with a spoon, spatula, horns or eyedropper (to liquid ingredients).

• Every increase or decrease the load on the pan of the scales should be penimbang in the circumstances does not move or sway.
• Do not exceed the capacity of weighing scales.
• When completed weighing scales tool, wipe and restore in case of locked.