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Reference Manual
00809-1600-4530, Rev AA
Section 5: Additional Options
March 2015
Additional Options
Section 5 Additional Options
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 31
Signal Quality Metrics (SQM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 31
Verification reflector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 32
5.1 Introduction
Additional options are available for the Rosemount 5300 that can be useful for diagnostics
under operating conditions.
5.2 Signal Quality Metrics (SQM)
SQM indicates the surface signal integrity compared to the noise. It can be used to schedule
maintenance to clean the probe or detect and monitor turbulence, boiling, foam, and
emulsions.
The following diagnostics measurements are available:
Signal quality is a measurement of the surface peak amplitude compared to the surface
threshold (ATC) and the smallest marginal between the noise and the ATC above the surface
(indicated with a circle) compared to the ATC. The signal quality spans from 0 to 10, where 0
indicates a low margin, and 10 indicates a high margin. It indicates how much margin there is
until the noise peak is indicated as the surface level. Surface/noise margin is the relationship
between surface peak amplitude and the amplitude of the strongest noise peak above the
surface. The surface/noise margin spans from 0 to 10, where 0 indicates a low margin, and 10
indicates a high margin. It indicates how much disturbance the device can handle in the tank.
Note
Since signal quality is reflective of the surface conditions, the probe, and the threshold settings,
it intended to be used while the device is measuring level. It is not considered a valid parameter
when the tank or chamber is empty.
Note
The signal amplitude and the noise margin depend on probe type and application conditions, as
well as the condition of the probe. Even if the probe is clean, signal quality and surface/noise
margin may not be a 10.
To check if the SQM function is supported, do one of the following:
If “DA1” or “D01” is mentioned in the model code on the label, the device supports
Signal Quality Metrics. Model Code: 530xxxxxxxxxxxxxxxxDA1 or
530xxxxxxxxxxxxxxxxD01xx