Measurement Performance
10.5.1Preparing for zero
To prepare for the zero procedure:
1.Apply power to the flowmeter. Allow the flowmeter to warm up for approximately 20 minutes.
2.Run the process fluid through the sensor until the sensor temperature reaches the normal process operating temperature.
3.Close the shutoff valve downstream from the sensor.
4.Ensure that the sensor is completely filled with fluid.
5.Ensure that the process flow has completely stopped.
CAUTION
If fluid is flowing through the sensor during zero calibration, the calibration may be inaccurate, resulting in inaccurate process measurement.
To improve the sensor zero calibration and measurement accuracy, ensure that process flow through the sensor has completely stopped.
10.5.2Zero procedure
To zero the flowmeter:
•Using the zero button, see Figure
•Using the display menu, see Figure
•Using ProLink II, see Figure
•Using a DeviceNet tool, see Figure
Note the following:
•If the transmitter was ordered with a display:
-The zero button is not available.
-If the
-You cannot change the zero time with the display. If you need to change the zero time, you must use ProLink II or a DeviceNet tool.
•If the transmitter was ordered without a display, the zero button is available.
-You cannot change the zero time with the zero button. If you need to change the zero time, you must use ProLink II or a DeviceNet tool.
-The zero button is located on the user interface board, beneath the transmitter housing cover (see Figure
-To press the zero button, use a
•During the zero procedure, the status LED on the user interface module flashes yellow.
100 | Micro Motion® Model 2400S Transmitters for DeviceNet™ |