5 Advanced functions
26
■
Note:
○
The value starts from the
NGR
process connection
○
The value should cover all interference signals
○
Maximum value = probe length – 100 mm
○
AutCal
function must be run after this (see Chapter 2 "Commissioning the
NGR
")
○
The CalRng parameter should always correspond to the probe length for
NGRs
with remote amplifier
5.6 Evaluating signal quality
Parameters describe the quality of the measuring signal.
■
Log into expert mode (see Chapter 5.1 "Expert mode")
SigQa1
■
Characteristic for the robustness of the
EXPRT-Config-TrsHld
setting
■
Not active in foam mode. The displayed value is only valid if the sensor displays the correct level
value.
○
Value range: 0 to 100%
○
Good signal: > 40% (a high pulse reserve is provided with the current
TrsHld
setting.)
■
Measures: Reduce
EXPRT-Config-TrsHld
to increase
SigQa1
.
■
Note:
○
Changing
TrsHld
will have an impact on
SigQa2
and
SigQa3.
○
If a satisfactory
SigQa1
value cannot be achieved by adjusting
TrsHld
in conjunction with the
SigQa
values, the installation condition must be checked. Using a coaxial tube improves signal
detection, particularly in media with low DK values (e.g., oil).
SigQa2
■
Characteristic for the robustness of echo pulse detection in relation to interference pulses
■
Not active in foam mode. The displayed value is only valid if the sensor displays the correct level
value.
○
Value range: 0 to 100%
○
Good signal: > 50%
■
Measures: Run
AutCal
; check installation conditions; remove deposits from probe and process
connection
SigQa3
■
Characteristic for signal noise and electromagnetic interference
○
Value range: 0 to 100%
○
Good signal: > 75%
○
Poor signal: < 50%
■
Not active in foam mode. The displayed value is only valid if the sensor displays the correct level
value.
○
Value range: 0 to 100%
■
Measures:
○
Increase
EXPRT-Config-TrsHld
○
EXPRT-Config-MeasMd
=
HiAcc
○
Improve filtering
○
Switch on filter
○
Reduce
EXPRT-Config-MaxCol
Summary of Contents for NGR
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