10
System alarm
Section 2: Troubleshooting
Maintenance and Troubleshooting Manual
January 2018
3-9000-772 Rev B
2.1.2
System alarm
The System alarm indicates a failure in the hardware that should be addressed by a service
technician. This includes memory checksum errors and communication errors within the
hardware. A Red LED indicates a System alarm condition. Collect a Maintenance log and an
audit/alarm log and then, contact your Daniel service representative.
2.1.3
Chord A, Chord B, Chord C and Chord D alarm
Chord A, Chord B, Chord C, and Chord D - These alarms indicate how a chord is functioning.
2.1.4
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 3818 LNG Liquid Ultrasonic Flow Meter
does not support this alarm.
2.1.5
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.
2.1.6
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.
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 acquisition for repeated batches indicates that the
meter should be inspected by a service technician.
Gray
The chord has manually been set to inactive.
