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9.3.4 Calculate and enter Viscosity Meter Factor manually
You can adjust viscosity measurement by applying a viscosity meter factor. The measured
dynamic viscosity is always multiplied by the viscosity meter factor. The result is used in
further calculations.
The default value of Viscosity Meter Factor is 1.0. Accordingly, the default value has no effect
on the line viscosity value.
Your meter is calibrated for one to four viscosity ranges. There is a separate meter factor
for each range. You can calculate or enter a meter factor for any or all of the viscosity
ranges.
Tip
You can adjust line viscosity measurement with Viscosity Meter Factor, Viscosity Offset, or both. Viscosity
Meter Factor is applied to the measured dynamic viscosity, and Viscosity Offset is added to the result.
Kinematic viscosity is calculated from this value. Referred viscosity may be calculated from either
dynamic viscosity or kinematic viscosity, depending on the configuration.
Prerequisites
You must be able to take a sample of your process fluid at a known temperature, then
obtain a laboratory value for the dynamic viscosity of the fluid at that temperature.
You must use ProLink III for this procedure.
Procedure
1. Take a dynamic viscosity reading from the device and record the line temperature.
2. Immediately after the previous step, take a sample from a location as close to the
device as possible.
3. Using the external measurement method, measure the viscosity of the sample at
line temperature.
4. Use the following equation to calculate an appropriate value for Viscosity Meter Factor.
μ
Lab
=
(
μ
Line
× ViscosityMeterFactor
)
+ ViscosityOffset
The default value for Viscosity Meter Factor is 1.0. The recommended range is 0.8 to
1.2. If your calculated meter factor is outside this range, contact Micro Motion
customer service.
5. Enter the meter factor.
a. Choose Device Tools > Configuration > Process Measurement > Line Viscosity.
b. Identify the viscosity range for the measured dynamic viscosity.
c. Enter the calculated meter factor for the identified viscosity range.
Measurement support
Configuration and Use Manual 141