The washers are to be removed from the scale. After placing the balance on a smooth, flat surface, slide the separate poise up into the slot on the back of the center beam. This slot is located between the and g marks on the bottom of the beam. Keep balance clean at all times. In general, most foreign matter may be easily removed by an air syringe. If foreign matter collects around the damping magnets it can be removed by pressing adhesive-backed tape on the magnet surfaces.
Never apply lubricants to knives or bearings, nor allow foreign matter to accumulate. Corrosive materials should never be placed directly on the platform since permanent damage could result. When moving the balance it is essential that you protect the vital parts of the instrument. This is done by placing one hand under the balance base and holding the pan support with the thumb and forefinger between the pan assembly and base.
This action lifts the knife blades from their bearing and thus prevents hard from jarring or stronger bumps. For major relocations we suggest that you reinstall the rubber washers that were removed when the unit was initially unpacked. Every time you wish to weigh an item on the Triple Beam Balance, you must first "zero" the balance. This sets the calibration of the balance to zero and will ensure that the proper reading will result.
The zero adjustment knob can be found on the far left side of the main balancing arm. If it is turned clockwise, the balance index pointer will lower. If turned counter clockwise, the index pointer will rise. In the example shown, the index pointer is below the zero mark, thus the zero adjust knob needs to be turned counter clockwise.
Notice that the index pointer is above the zero mark indicating that the amount of weight on the platform is greater than the poises. Step 2: Move the g poise to the right until the index pointer swings below the zero mark, then back it up one notch. Step 4: Slowly move the 1g poise until the index pointer lines up with the zero mark. The specimen is hung using fine wire or thread from the bottom of the platform assembly.
COVID has impacted the manner in which we are able to offer in-person ZB classes and has provided new challenges in how we safeguard the health of our students, our classes and our faculty.
These guidelines will provide a set of criteria and practices that will allow us to create as safe a learning environment as possible; in which we can study and practice Zero Balancing in a healthy and responsible atmosphere during this pandemic. We will monitor experiences as well as updated public health recommendations and edit these guidelines as needed. Zero Balancing feels refreshing from the inside out.
After listening to your goals, your practitioner evaluates and balances key areas throughout the body, first with you sitting, then lying face up, fully clothed. A treatment usually lasts 30 to 45 minutes, and releases deep tension in bones, joints and soft tissue. Afterwards you may feel lighter, freer, energized and more in tune with yourself. Upcoming Courses Zero, on the other hand, should be used to return a scale to zero when nothing is placed on it. Find out what the difference is in this blog post.
Unfortunately, even scales of the highest-quality can be affected by external factors. We briefly discussed one of them in this blog post, but you can review all the factors that can affect your scale accuracy in this blog post.. If you are confused about any other weighing terms, take a look at our industrial weighing scale glossary. Many professors of Quantitative Analysis do not allow them to be placed in the same room where the analytical balances are kept because students often use them to save time when they ought to be using the analytical balances.
First of all, the top loading balances are less precise by a factor of 10 and secondly, air currents around the pan can reduce that precision by as much as another factor of 3 or 4.
But the top loading balance is the instrument of choice where precision is not of great importance. Here is one our top loading balances. It can be "tared" by pressing the front bar, as shown at the right.
In the drawer below the top loading balances you will find weighing paper. This paper must be used ONLY on the top loading balances, NEVER on the analytical balances, because there is always the chance that some of the substance being weighed will stick to the weighing paper after the weight has been recorded thus producing an error on the low side. Once a piece of weighing paper has been placed on the pan, and the balance set to 0. Top-loading balances Located in the room adjacent to the laboratory.
Analytical balances Also located in the room adjacent to the laboratory. Close the balance door, while weighing an object, in order to prevent air currents from disturbing the reading. When finished, the operator should close the balance door to prevent dust and dirt from entering the balance. Only glass, ceramic, metal or plastic objects and containers should be placed in direct contact with the balance pan.
Do not handle objects to be weighed with bare hands. Moisture, grease and dirt on you fingers will affect the weight of the objects. To be weighed accurately, all objects must be at room temperature. A warm object sets up convection currents inside the balance enclosure, which will make an object appear lighter than it really is.
Also, warm air inside the enclosure is less dense than the air that it displaces and this also leads to a negative determinate error. Never weigh chemicals directly in contact with the balance pan. Use containers such as beakers, flasks and weighing bottles. All objects and materials that have recently been removed from a desiccator will absorb moisture and thereby gain weight.
It is therefore good practice to record weights after identical time intervals.
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