Filter
Top Products
46 Micro Motion 7827 Digital Viscosity Meter
Calibration Check
Viscosity calibration is effectively immune to temperature or pressure errors when operating with
Newtonian fluids.
As a general guide, Table 6-1 shows the accuracy of the 7827 meter:
6.4.2 Density
The 7827 meter is calibrated for density at 20°C and at atmospheric pressure using specified fluids.
When operating at other conditions it is necessary to increase the uncertainty of measurement, either
by the magnitude of the offsets if no corrections are applied, or by a fraction of the offsets if
corrections are applied.
As a general guide, Table 6-2 lists the sources and magnitudes of the offsets affecting the meter:
For total operational accuracy, the square root of the sum of the squares of each error source is
recommended, ie:
Effective total = 1 / [ A
2
+ B
2
+ C
2
+ D
2
+ E
2
]
2
6.5 Calibration certificate example
Note: This is an example only - it is NOT the calibration certificate for your 7827 meter.
Table 6-1 Error sources on indicated viscosity
Error source 7827
A. Instrument accuracy (with Newtonian fluids) ±0.2 cP for 0.5-10 cP range
± 1 % of Full Scale Range for other ranges:
• ± 1 cP for 1-100 cP range
• ± 10 cP for 100-1,000 cP range
• ± 200 cP for 1,000-20,000 cP range
Table 6-2 Error sources on indicated density
Error Source 7827
A Instrument accuracy (at calibration conditions) ± 1 kg/m
3
B Temperature (uncorrected)
Temperature (corrected)
+ 1.5 kg/m
3
per °C @ 1000 kg/m
3
± 0.1 kg/m
3
per °C @ 1000 kg/m
3
C Viscosity (uncorrected)
Viscosity (corrected)
Described in the Calculated Parameters
appendix.
± 1 kg/m3 for 1-100 cP
± 2 kg/m
3
for 100-1,000 cP
± 5 kg/m
3
for 1,000-20,000 cP
D Velocity Of Sound (uncorrected)
Velocity Of Sound (corrected)
Described in the Calculated Parameters
appendix.
20% of offset
E Long term stability ± 0.5 kg/m
3
per year