
Using ProLink
®
Software with Micro Motion
®
Transmitters
133
Applications Menu Help Menu
Configure Menu:
Meter Factors
Calibrate Menu Test Menu
14 Calibrate Menu
14.1 Overview
Calibration and trim account for performance variations in individual
sensors, transmitters, and peripheral devices. When a transmitter and
sensor are ordered together as a Coriolis flowmeter, they are factory
calibrated to produce highly accurate measurements of mass flow, fluid
density, and flow tube temperature. However, the ProLink program
supports field calibration, thereby enabling sensors and transmitters to
be interchanged.
While performing calibration procedures, write values in the appropriate
Flowmeter Calibration Record, shown in
Appendix F
, page 189.
14.2 Auto zero
Flowmeter zeroing establishes flowmeter response to zero flow and sets
a baseline for flow measurement.
To zero the transmitter, follow these steps:
1. Prepare the flowmeter for zeroing:
a. Install the sensor according to the appropriate sensor instruction
manual.
b. Apply power to the transmitter, then allow it to warm up for at least
30 minutes.
c. Ensure the transmitter is in a security mode that allows flowmeter
zeroing.
d. Run the process fluid to be measured through the sensor until the
sensor temperature reading approximates the normal process
operating temperature.
2. Close the shutoff valve downstream from the sensor.
3. Fill the sensor
completely
with fluid under normal process
conditions of temperature, density, pressure, etc., and ensure zero
flow through the sensor.
CAUTION
Flow through the sensor during flowmeter zeroing
will result in an inaccurate zero setting.
Make sure fluid flow through the sensor is completely
stopped during flowmeter zeroing.
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