Sartorius MC 5, Руководство по обслуживанию, Страница: 26 / 49

26 SARTORIUS MC 5 Balance Stand 1/94
MC 5
Indifferent Equilibrium
Checking the Indifferent Equilibrium (Tilt):
- Required only after you have worked on the weighing system
Purpose: Slight tilting of the weighing system must not cause the display to vary by more than ± 5 d !
- Unload the weighing pan and tare the microbalance.
- Level the microbalance using the level indicator and tare.
- Tare the microbalance. Then check the „front-to-back“ level.
- Tilt the microbalance so that the level indicator shows and write down the value displayed.
- Re-level the microbalance so that the circle in the level indicator returns to the original centered
position.
- Tare the microbalance. Then check the „right-to-left“ level.
- Tilt the microbalance so that the level indicator shows and write down the value displayed.
- Re-level the microbalance so that the circle in the level indicator returns to the original centered
position.
The values displayed must be within the tolerances ( ±5d ).
Adjusting the Indifferent Equilibrium:
As a rule, this is hardly ever necessary.
--> All microbalances are adjusted at the factory. Any substantial variation is due to a deeper
underlying cause. In this case, you should return the microbalance to the factory in Goettingen,
Germany, whenever possible.
- You can adjust the indifferent equilibrium on the „right-to-left“ level
through the closed cover (see diagram on the left) by using the set
screw 5 on the system support.
- Check the indifferent equilibrium by following the procedure described
above.
- Adjust the equilibrium by turning the set screw.
- Read off the display and repeat this procedure until the readout is
within the tolerances (± 5d).
Caution! Always use the special tool to lock the lever beam first before loosening the indifferent
equilibrium weight on the lever in order to adjust it.
Therefore, the weight cannot be adjusted without using the appropriate tool!
- Check the „front-to-back“ indifferent equilibrium by following the procedure described above.
- Read off the display and repeat this procedure until the readout is within the tolerances listed below:
Zero point error ±0.000005g
Sensitivity error for 5g ±0.000005g
- If the "!front-to-back“ indifferent equilibrium is out of tolerance, return the microbalance to Sartorius
Service Headquarters in Goettingen, Germany.