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Electro-optical analytical balance is essential for measuring and testing instruments, Measurement and Testing Technology institutions in widespread use . In order to improve the use of electro-optic analytical balance level , in this, the author of what the electro-optical analytical balance proper use and maintenance .

 

1 principles and basic composition

 

Electro-optical analytical balance is a measure commonly used in laboratory mass of the object of the instrument. Familiar with how it works and the basic structure is the proper use and maintenance of an important prerequisite. Its principle is based on the principle of leverage , using the session object to compare two methods to measure the weight of the mass of the body . It mainly consists of columns, beams , hanging system , base and brake components. Vertical column fixed to the base , is used to support the beams . The lower part of the column with indexing cards, while the top bracket with the bracket does not work when the balance beam . The beam in the middle with a knife . Balance work, a knife resting on the top of the lift rod connected with the Order of the knife , as a fulcrum ; knife in the knife edge on both sides with two , respectively, as the focus and power points, carry and transfer the load from the role .

 

2 Use and maintenance

 

First, the electro-optic analytical balance should be stored in a dry , no direct sunlight and resistant to heat , the cold place , and the laboratory shall be free of harmful gases or water vapor ; balance should be placed inside the desiccant, and the need to be replaced regularly to ensure balance within the air-drying ; workbench must be flat , firm steady, sturdy ; someone keeping balance and weight , and to maintain the integrity of clean.

 

Two is not always moving, must move in , they need to balance plate and beams unloading and moving parts in advance ; regularly check the balance of each component, and kept clean ; if there is dust components , application soft brush to gently sweep being careful not to damage the blade turning or screw .

 

Third, if found balance malfunction , damage or suspicious , you should immediately stop using , not arbitrarily remove part or assembly parts , to actively detect viewing.

 

Four days before the first weighing is folded shroud removed , on the balance and the right rear box countertop ; prior to use , to view balance usage records in order to understand the balance before this usage , and check the color gel is valid, whether the balance is in a normal state , if necessary, to be with a soft brush cleaning, adjust zero balance and checking weight.

 

Five is not too hot or cold weighing objects is called object temperature should be consistent with the balance inside temperature ; specimen weighing vessel should be installed in order to prevent contamination of the balance ; take place when you use paper weighing vessel Article .

 

Sixth, lift off hinge should be light open light ; take place objects , plus or minus the weight , should hold the balance beam to avoid damaging the agate knife .

 

Seven is to take place weights must tweezers gripping prohibited by hand ; subtract weights principle is: " descending , binary adding" ; subtract weights when playful, not too fast rotating ring yards Index plate , to avoid jumping or displacement loop code .

 

Eight is the load can not exceed the maximum load balance , weighing scales before the first use of the coarse said ; accurate readings , you must shut the doors of all the balances ; weighing data should be written in the record book , not to be entered in the paper or elsewhere.

 

Nine is the balance must specify an experiment done all the weighing operation and can not be replaced midway balance ; in the weighing process, the balance should not be adjusted . After weighing , hold the balance , remove to be said and weights, and the ring plate code index reversed zero , cut off the power , hood shields, registration balance usage.

 

Ten is used during the test should be required on a regular basis , and holds a qualification test certificate.

 

3 Faults and troubleshooting

 

First, when the lamp dark bright reasons : insufficient power supply voltage ; bulbs required voltage and transformer output voltage does not match. Another is the long light . The reason : The main power contactor is two pieces glued together sake . Remedy: Power glued together by hand contact pads separated from its curved crescent , appropriately increase the flexibility of the contact sheet and gaps .

 

Second, the level of the disc holder inappropriate . Fault performance : disc tray is too high, usually days off , lift the pan , sometimes causing lug off ; disc tray is too low , turn off the balance after the pan still swing freely . Remedy : You can remove the pan , remove the disc tray, adjusting disk tray below to change the position of the screw rod plate holder to the appropriate height .

 

Three is a pointer beating. Fault performance : When the beam is hold up , if the fulcrum knife blade and the knife back and forth between different distances pad , then open day usually will produce pointer beating. Exclusion methods: the horizontal bracket screw to relax in front of the left arm , then use the special wrench to adjust a small stick or dial pillar height , until the pointer is no longer beating.

 

Four is exponential disk failure . If the weight is hanging hook ups and downs of failure , then you should remove the index plate behind the cover , dripping oil. Is also possible that the screws loose , you should put the screws tightened. If it is exponential disk plus the weight readings do not match , you can loosen the screws eccentric , eccentric rotation to change the location , and then tighten the screw .