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Rosemount Model 8800C Vortex Flowmeter with FOUNDATION
™
Fieldbus
4-10
Alarm Detection Alarms are not generated by the transducer block. By correctly
handling the status of the channel values, the down stream block (AI)
will generate the necessary alarms for the measurement. The error that
generated the alarm can be determined by looking at BLOCK_ERR and
XD_ERROR.
Status Handling Normally, the status of the output channels reflects the status of the
measurement value, the operating condition of the measurement
electronics card, and any active alarm condition. In Auto mode, OUT
reflects the value and status quality of the output channels.
Troubleshooting Refer to Table 4-5 to troubleshoot any problems that you encounter.
TABLE 4-5. Troubleshooting.
FLOW UNITS The flow units are configured in the AI block. If Standard or Normal
flow units are selected, the density ratio must be entered in the
transducer block in order for the conversion to take place. If mass units
are selected, the process density must be entered.
Standard/Normal
Flow Units
The Model 8800C Flowmeter allows you to measure standard or
normal flow units (SCFM, SCFH, NCMM, NCMH, NCMD).
Configure the software in one of two ways:
1. Enter the density ratio to convert from actual flow rate to
standard flow rate.
2. Enter the process and base conditions. (The Model 8800C
Flowmeter electronics will then calculate the density ratio for
you.)
See Density Ratio and Process and Base Conditions below for
definitions.
NOTE
Be careful to calculate and enter the correct conversion factor. Standard
flow is calculated with the conversion factor you enter. Any error in the
factor entered will result in an error in the standard flow measurement.
If pressure and temperature change over time, use actual volumetric
flow units. The Model 8800C flowmeter does not compensate for
changing temperature and pressure.
Symptom
Possible
Causes
Corrective Action
Mode will not leave out of
service (OOS)
Target mode not
set
Set target mode to something other
than OOS.
Resource block The actual mode of the resource
block is OOS. See Section 5:
Resource Block “Troubleshooting”
on page 5-5 for corrective action.
PV or SV is BAD. Measurement See “Diagnostics” on page 4-9.
Flow is above
SENSOR_RANGE.EU100.
PV or SV is UNCERTAIN. Measurement Flow is above
PRIMARY_VALUE_RANGE.EU100
or flow is being simulated in the
transducer block.