Emerson Series 3000 MVD Manuel D’Utilisation
Configuration and Use Manual
135
Startup Procedures
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16.3.1
Zero failure and restoring zero values
If the zero procedure fails, see Section 16.3.4 for troubleshooting information.
Additionally, if you have the enhanced core processor:
•
You can restore the factory zero. This procedure returns the zero value to the value obtained at
the factory, if the factory configuration has been saved on the transmitter.
the factory, if the factory configuration has been saved on the transmitter.
•
If you are using ProLink II to zero the flowmeter, you can also restore the prior zero
immediately after zeroing (e.g., an “undo” function), as long as you have not closed the
Calibration window or disconnected from the transmitter. Once you have closed the
Calibration window or disconnected from the transmitter, you can no longer restore the prior
zero.
immediately after zeroing (e.g., an “undo” function), as long as you have not closed the
Calibration window or disconnected from the transmitter. Once you have closed the
Calibration window or disconnected from the transmitter, you can no longer restore the prior
zero.
16.3.2
Preparing for sensor zero calibration
To prepare the flowmeter for sensor zero:
1. Install the sensor according to the appropriate sensor instruction manual.
2. Apply power to the Series 3000 system, then allow it to warm up for at least 30 minutes.
3. Run the process fluid to be measured through the sensor until the sensor temperature
approximates the normal process operating temperature.
4. Close the shutoff valve downstream from the sensor.
5. Fill the sensor completely with process fluid under normal process conditions of temperature,
density, pressure, etc., and ensure zero flow through the sensor.
6. Make sure flow through the sensor is completely stopped.
16.3.3
Performing the sensor zero calibration
To perform the sensor zero:
1. From the Calibration menu (see Figure 16-1), select
Sensor Zero
. The Calibration menu is
accessed through the Maintenance option of the Management menu.
2. Check the setting for
Zero Time
, and change it if desired.
3. Note the value displayed for
Mass Flow Rate
. If it is non-zero, recheck sensor preparation
4. Select
Calibrate Zero
, then press
SEL
. During sensor zero:
•
A
Calibration In Progress
alarm is generated.
•
The time remaining counts down to zero seconds.
•
The
Calibrate Zero
screen displays an “In Progress” status, and the zero offset in
microseconds.
CAUTION
If fluid is flowing through the sensor, the sensor zero calibration may be
inaccurate, resulting in inaccurate process measurement.
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.
process flow through the sensor has completely stopped.