Emerson 2200S User Manual
86
Micro Motion
®
Model 2200S Transmitters
Operating the Transmitter
8.4
Recording process variables
Micro Motion suggests that you make a record of the process variables listed below, under normal
operating conditions. This will help you recognize when the process variables are unusually high or
low, and may help in fine-tuning transmitter configuration.
operating conditions. This will help you recognize when the process variables are unusually high or
low, and may help in fine-tuning transmitter configuration.
Record the following process variables:
•
Flow rate
•
Density
•
Temperature
•
Tube frequency
•
Pickoff voltage
•
Drive gain
For information on using this information in troubleshooting, see Section 10.13.
8.5
Viewing process variables
You can view process variables with the display (if your transmitter has a display), ProLink II, or the
Communicator.
Communicator.
8.5.1
With the display
If the transmitter has a display, the
Process variable
line on the LCD panel shows the configured
display variables, and the
Units of measure
line shows the measurement unit for that process
variable.
Auto Scroll may or may not be enabled:
•
If Auto Scroll is enabled, each configured display variable will be shown for the number of
seconds specified for Scroll Rate.
seconds specified for Scroll Rate.
•
Whether Auto Scroll is enabled or not, the operator can manually scroll through the configured
display variables by pressing
display variables by pressing
Scroll
.
If more than one line is required to describe the display variable, the
Units of measure
line alternates
between the measurement unit and the additional description. For example, if the LCD is displaying a
mass inventory value, the
mass inventory value, the
Units of measure
line alternates between the measurement unit (for
example,
G
) and the name of the inventory (for example,
MASSI
).
For a list of the codes and abbreviations used on the display, see Appendix C.
Process variable values are displayed using either standard decimal notation or exponential notation:
•
Values smaller than 100,000,000 are displayed in decimal notation (e.g.,
1234567.89
).
•
Values greater than 100,000,000 are displayed using exponential notation (e.g.,
1.000E08
).
-
If the value is less than the precision configured for that process variable, the value is
displayed as
displayed as
0
(i.e., there is no exponential notation for fractional numbers).
-
If the value is too large to be displayed with the configured precision, the displayed
precision is reduced (i.e., the decimal point is shifted to the right) as required so that the
value can be displayed.
precision is reduced (i.e., the decimal point is shifted to the right) as required so that the
value can be displayed.