Eureka" Air Buoyancy Correction Program - Sartorius MC 210 S Installation And Operating Instructions Manual

"EUREKA" Air Buoyancy Correction Program

"EUREKA" Air Buoyancy Correction Program
Symbol displayed: +/–
Key identified by:
– STO - F when the air density is 1.2 kg/m
– STO - F when the air density is different from 1.2 kg/m
Because of air buoyancy, samples or objects with the same mass but different
densities have different weights.
To obtain the true mass of the sample, the weight is multiplied by the
following factor:
ρ
L
1 – –––
ρ
ST
K = ————————
ρ
L
1 – ———-
ρ
W
where:
ρ
= air density in kg/m
L
ρ
= density of steel 8000 kg/m
ST
ρ
= density of the object/sample to be weighed in kg/m
W
Important Note for Verified Balances Approved for Use as Legal
Measuring Instruments in the EU:*
You may not use weights corrected for the effects of air buoyancy when the
balance is being used as a legal measuring instrument. The display symbol "R2"
flashes to identify non-verified weights (not legal for trade).
** = for directions on air density determination, see page 3–9
** = including the Signatories of the Agreement on the European Economic Area
3
3
3
(calibration weight)
Code 2 1 8
3
*
3
3–5