Emerson Process Management ControlWave EFM 3808 - Manual (Page 44)

1-28 / Introduction CI-ControlWave EFM
1.5.6.2 Pulse Output for External Totalizer or Sampler
When the ControlWave EFM is configured to provide a pulse output based on volume, the
operator provides a control volume and pulse duration. After each calculation cycle, an
internal volume accumulator is compared to the control volume. If the accumulator exceeds
the control volume then a pulse is output and the accumulator is reduced by the volume
represented by the pulse. The pulse output may be used to drive an external totalizer,
odorizer, gas sampler, or similar device.
1.5.6.3 Nominations
The nomination function allows a user to establish a time period over which an
accumulation count of volume or energy that is delivered during the period is monitored
and compared to a configured ‘nomination' value. When the nomination value is reached,
the system will perform an action (such as opening or closing a valve). Prior to nomination
being reached, the volume/energy will be compared to a configured alarm level and an
alarm will be generated when the volume/energy reaches or exceeds the defined (specified)
level.
1.5.7 Self Test & Diagnostics
The ControlWave EFM periodically runs a series of diagnostics to verify the operational
status of various system components. The tests include transducer parameters, main and
backup battery voltages, software sanity checks, and other indications of system health. An
appropriate alarm is generated if any test fails.
Bristol, Inc’s. WINDIAG program provides menu driven diagnostics that have been
designed to assist a technician or Process Engineer in troubleshooting the various
ControlWave EFM Modules (see Document D4041A).