Process alarms:
Process alarms are generally related to a process value, such as volume flow rate, exceeding
the specified output span limits. For example; the current or frequency output may be out of
range, or the user defined process value alarm / warning limit may be exceeded.
There are many installation errors which can lead to poor flow measurement accuracy, even in
the absence of a maintenance or process alarm. For this reason it is important to also evaluate
the sensor diagnostics to verify that the flowmeter is operating within an acceptable range for
optimal performance.
If a persistent or intermittent alarm occurs, or the flow measurement accuracy is suspect, first
check that the installation and commissioning are performed as described in the Operating
Instructions.
If the alarm is still not resolved, then go through the steps of the Troubleshooting Guide shown
below. The troubleshooting guide, and the referenced subsections, will enable you to trace the
reason for the alarms as well as offer potential solutions for resolving the problem.
9.2 Troubleshooting Guide
Troubleshooting guide
The tables below provide an overview of potential symptoms with associated alarm codes and
diagnostics (if applicable). The possible cause and remedy are shown in the right two columns.
Additional troubleshooting steps are noted with gray highlighted references marked A1, A2, etc.
This troubleshooting guide assumes basic knowledge of the sensor diagnostics, especially with
regard to the path specific liquid Sound velocity, Rx signal (receive signal), SNR (signal to noise
ratio), RxGain (receive amplifier gain), and CorrFact (Correlation factor). Please refer to Check
sensor specific data (Page 97)for more detail.
Diagnostics and troubleshooting
9.2 Troubleshooting Guide
SITRANS FST030 (Modbus)
88 Operating Instructions, 08/2018, A5E37367739-AD
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