Attributes; Diagnostic Transducer Block; Execution - Honeywell SLG 700 Option Manual

Attributes

Supported Modes
Alarm Types
ATTENTION
Experion does not support displaying of Echo Curve. To view the Echo
Curve, FDM/DTM should be used

3.7 Diagnostic Transducer block

The Diagnostics Transducer block is used to monitor the sensor and communication board diagnostics.

Execution

The block has Sensor and Device diagnostics. The block is executed as follows.
3.7.1. Sensor Diagnostics:
The device processes the diagnostic data such as Sensor MCU temperature, MCU Supply Voltage and
Surface and Interface Signal Strength and Signal Quality. Surface and Interface diagnostics are
updated along with status. GOOD status is updated if Signal Strength and Quality is good.
Signal Quality:
This variable indicates the degree of match between the reflection model and the live echo
curve data. This value is 1 minus the objective function value (see section 3.6.2) and values
close to 1 represent a very good match. If this number drops too low the reflection models
should be checked as described in section
Signal Strength:
This variable indicates the amplitude of the indicated reflection. The level and interface
reflections are negative, therefore a lower higher value indicates a larger amount of the radar
energy was reflected which should provide a good signal to noise ratio. If this value drops too
low the transmitter may not be able to reliably track the associated level. A good reflection
should be approximately the same size as the gain for the correlation model peak: the
acceptable values are dielectric constant and range dependent. Good values are in the range
between -500 and -9000 counts.
When the tank is empty or nearly empty, the reported Signal Strength and Signal Quality for Surface
and Interface will instead be the ones for the End of Probe reflection.
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The block supports the following modes:

AUTO (Automatic)

OOS mode (Out of Service)
The block supports standard block alarms (see section 3.2).
3.6.5.
FOUNDATION Fieldbus Option User's Manual Rev.5