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280 Chord A to Chord D
Section 7: Maintenance and troubleshooting Reference, Installation, and Operations Manual
June 2013 3-9000-743 Rev S
7.5.3 Chord A to Chord D
Chord(s) A through D - These alarms indicate how a chord is functioning Red and green are the
only colors used for this alarm.
7.5.4 Field I/O Alarm
Reports various field I/O devices that are in alarm. Click the Check Status button for more details
on specific alarms. The field is grayed out if the Daniel 3400 Series Gas Ultrasonic Flow Meter
does not support this alarm.
7.5.5 Validity Alarm
This alarm indicates that the meter may not be measuring accurately. Click Check Status to see a
description of which validity alarms are active. The validity alarms QMeter and QFlow indicate
an issue with the meter collecting enough information from the chords to make an accurate
measurement. The validity alarms for pressure and temperature indicate that the value is above
or below the alarm limits for these values. Red and green are the only colors used for this alarm.
7.5.6 Comms Alarm
The Comms alarm indicates that communications between Daniel MeterLink and the meter
failed. This could be due to a poor communication link. Daniel MeterLink continues to retry
communications. Red and green are the only colors used for this alarm.
7.5.7 Check Status
Click Check Status if any of the LEDs are yellow or red to see more specific information causing
the status alarm. Some alarms do not require an acknowledge and will clear automatically when
the alarm condition goes away. Alarms that require a user to acknowledge them will have a
button to the right titled
ACK. Clicking the ACK button changes the button text to Wait and
sends a request to the meter to clear the alarm. The alarm will disappear from the Check Status
dialog once the alarm actually clears.
Table 7-3 Chord alarms
LED Color Problem
Green No alarms are present. Chord is operating properly.
Yellow At least one sample in the batch caused an alarm but it did not
cause the chord to fail. The sample will not be used in the batch.
Discarding occasional samples can occur during normal operation
such as during flow velocity changes.
Red The chord has failed or is in acquisition. This chord is not used for
this batch. Chords that have failed or are shown to be in acquisi-
tion for repeated batches indicates that the meter should be
inspected by a service technician.
Gray The chord has manually been set to inactive.