Filter
Top Products
9 Measurement support
Topics covered in this chapter:
•
Options for measurement support
•
Zero the flowmeter
•
Validate the meter
•
Perform a (standard) D1 and D2 density calibration
•
Perform a D3 and D4 density calibration (T-Series sensors only)
•
Perform temperature calibration
9.1 Options for measurement support
Micro Motion provides several measurement support procedures to help you evaluate and
maintain your flowmeter's accuracy.
The following methods are available:
• Meter validation compares flowmeter measurements reported by the transmitter to
an external measurement standard. Meter validation requires one data point.
• Calibration establishes the relationship between a process variable and the signal
produced at the sensor. You can calibrate the flowmeter for zero, density, and
temperature. Density and temperature calibration require two data points (low and
high) and an external measurement for each.
Tips
• To prove the meter against a regulatory standard, or to correct measurement error, use
meter validation and meter factors.
• Before performing a field calibration, contact Micro Motion to see if there is an alternative. In
many cases, field calibrations have a negative effect on measurement accuracy.
9.2
Zero the flowmeter
Zeroing the flowmeter establishes a baseline for process measurement by analyzing the
sensor's output when there is no flow through the sensor tubes.
Important
In most cases, the factory zero is more accurate than the field zero. Do not zero the flowmeter unless
one of the following is true:
• The zero is required by site procedures.
• The stored zero value fails the Zero Verification procedure.
Measurement support
Configuration and Use Manual 143