I use a digital density meter M20 to determine the density of materials. Until recently it was working accurately but now it is giving higher values than the actual.
The weight readings in the air are accurate. I confirmed it using two other analytical balances in the lab. So, the error is coming from the weight measured when the part is immersed in water. The water in the reservoir is filled up to the mark. There are no bubbles. Samples are wiped with acetone before testing.
I tested materials with actual densities higher than 1.0. like lead, filled thermoplastic composites, and also with actual density lower than 1.0. Parts are fully immersed in water. I corrected readings with the density of water at reservoir temperature. I also checked if there is anything obstructing the balance and if the balance is perfectly leveled. The wires which hold the cage in reservoirs are clean. The error is consistent 3.7 to 3.8%.
What could be the reason that densities displayed by density meter is higher by the same amount?
- Badges
- Science topic