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Installation and Configuration Manual 41
Calibration Check General MaintenanceUsing 795X Processing Electronics
Chapter 6
Calibration Check
6.1 Introduction
The following information details the calibration method and performance of the 7827 digital
viscosity meter and covers the following:
• Factory calibration
• In-line calibration
• Performance
6.2 Factory calibration
6.2.1 Viscosity
The 7827 meter is calibrated against fluids characterized with prime standards, prior to leaving the
factory. The meter may be calibrated over one or a combination of four viscosity ranges detailed
below:
• Range: Viscosity range (cP)
• Ultra-low: 0.5 - 10 cP
• Low: 1 - 100 cP
• Medium: 100 - 1,000 cP
• High: 1,000 - 12,500 cP
The 7827 meter’s default calibration is in “free stream” conditions, where the effect of solid
boundaries is negligible on the output of the meter. The calibration may also be performed in a
“tee-piece,” in which case the part number above is succeeded by a “T”.
Note: A high-range unit cannot be ordered with a tee-piece calibration.
Hygienic units can be calibrated in a 3” hygienic bore if required.
Three fluids are used to establish the general viscosity equation's constants for each viscosity range
required. See the Calculated Parameters appendix.
The instrument-under-test is immersed into the calibration fluid which has been previously
characterized for viscosity and density with prime standards. Great attention is paid to temperature
equalization and fluid homogeneity within the tank before the calibration data is taken. This
procedure is repeated for each calibration fluid and for each viscosity calibration range required.
Once the meter has been passed through the necessary fluids, a factory calibration certificate is
produced from the measurement data.