The analytical performance of the analytical balance is sensitive, unequal arm, and indication variability. The sensitivity of the balance is expressed by sensitivity. The so-called sensitivity is the stopping point of the balance. In use, the sensitivity is commonly used to indicate the sensitivity of the balance. The edges of the balance beam can be adjusted so that the two arms are equal in length. If the two arms are not equal, the arms are unequal. The indication variability refers to the fact that the balance is activated multiple times without changing the state of the balance, the repeatability of the zero point of the balance, or the zero point before and after the weighing.
Analytical balance maintenance and use
1. The analytical balance should be placed in a separate dedicated room. The room should preferably face north, avoid direct sunlight and heat and cold, and be protected from moisture and airflow.
2. The analytical balance should be placed on the base of the insulation protection platform or placed on the concrete platform fixed to the main wall to avoid vibration.
3. Before weighing, first check whether the balance position is level, whether the components are normal, and then correct the zero point or make necessary adjustments.
4. The quality of the material to be weighed must not exceed the load limit specified by the balance. When twisting and analyzing the balance lift arm, it must be slow and careful to prevent the balance arm from swinging a lot and damage the knife edge.
5. The sample and weight must be added, subtracted, taken, and placed after the balance of the balance is closed. After each balance door is closed, the lift shaft can be lowered to observe the reading.
6. The temperature of the substance to be tested should be the same as the room temperature of the balance room. Weighing, hygroscopic, volatile or corrosive substances and liquids must be placed in the container, and the lid should be tightly closed for weighing.
7. The weight can only be taken with the balance dice. Do not take the weight directly by hand. After use, put it back in the fixed position inside the weight box.
8. Only the same analytical balance and weight are allowed during the same analysis.
9. After weighing, write down the quality, check whether the balance beam is dragged, whether the weight is complete, whether the balance door is closed, and then cover the balance cover.
10. Analyze the balance to keep it dry and clean, frequently change the desiccant, wipe off the dust on each part with a soft brush, and check it regularly to maintain its accuracy.
Analytical balance common troubleshooting
1. The lifting ear is off or on the side
Cause: The switch is too fast, the safety of the lifting ear is unstable, and the left and right sides are sideways.
Remedy: Lightly open and close, use needle-nosed pliers, loosen the screws under the small pillar at the end of the beam bracket, move the small column to the left and right, and then test it after tightening, even if it is no longer sideways. If the lifting lug jumps back and forth, the rod can be inserted into the upper hole of the small column to rotate, and the height of the small pillar is the same.
2, the tray height is not appropriate
The weighing pan can be removed, the tray removed, the screws loosened, and the tray height adjusted to fit.
3, the pointer beats
The screw in front of the left arm of the bracket can be loosened, and then the height of the small pillar can be adjusted by hand until the pointer no longer jumps.
4, the balance is blocked
Cause: The tray is stuck and cannot be lowered, the inner and outer dampers are touching or there is slight friction.
Remedy: Check if the analytical balance is level. According to the principle of the left and right, the internal damper is misplaced. If the above adjustment is invalid, carefully loosen the screw that fixes the outer damper and the inner damper as the standard to move the outer damper until the friction is no longer tightened.
5, the index disk fails
First tighten the screw to the reading position of the index plate
If the hook of the hanging code fails, the outer cover of the index plate is removed and the oil is dripped.
If the screws are loose, tighten the screws.
If the index disk reading does not correspond to the weight added, you can loosen the screw rotation of the eccentric to change the position of the eccentric, and then tighten the screw.
6. Adjustment of photoelectric balance photoelectric system
1 The light source is not strong: the position screw of the lamp cover can be loosened. Turn the lamp holder to rotate or move the lamp cover back and forth to make the light source and the light collecting tube in line until the intensity of the projection screen is sufficient. Then tighten the set screw.
2 If the scale is unclear, the magnifying glass can be rotated by a slight movement until the scale is clear.
3 If there is a black shadow defect on the projection screen, you can adjust the angle of the two mirrors or turn the lamp cover cylinder until the luminosity field is complete and clear.
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