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Measurement Difficulties
If a measurement difficulty occurs for greater than the Failsafe Timer (P070)
setting, "LOE" is flashed alternately with the Reading display. Under certain
conditions, a measurement difficulty may cause the DPS300 to "lock on" to a false
echo and report a fixed or wrong reading.
Flashing "LOE" Display
If "LOE" is displayed, ensure that the:
1. Sludge surface is within the maximum range of the transducer (see Transducer on
page 6).
2. Transducer is located properly (see Application Planning on page 16).
To display Echo Confidence in the RUN mode press
(Failsafe Time Left changes to the Short : Long Confidence display).
To display Echo Confidence in the program mode, access the Echo Confidence
(P805) parameter. To update the value displayed after each aiming adjustment
press
Increase the Failsafe Timer (P070) value, if failsafe operation will not be
compromised by the larger value.
LOE may be an indication that the sludge is at a level exposing the clarifier at that
point. The slope bottom of the clarifier may be reflecting the echo away from the
transducer. Move the transducer to a location where there is still a sludge blanket
or limit the sludge low level.
If a discernible echo from the sludge is observed, reduce the Confidence
Threshold (P804) while taking new measurements (in the RUN or program mode).
Fixed Reading
If the Reading is a fixed value, regardless of the transducer to sludge distance,
ensure the:
1. Transducer sound beam is free from obstruction.
2. Sludge level is not within the Transducers' nearest measurable distance.
If the obstruction cannot be removed or avoided, the DPS300 TVT (Time Varying
Threshold) Curve must be modified to reduce the Echo Confidence derived from
the sound reflected by the obstruction. (See ENHANCEMENT PARAMETERS /
Scope Displays, P810 and TVT Shaper, P832).
7ML19981BC01
TROUBLESHOOTING GUIDE
(5 times or more to verify stability).
103
and hold for 4 seconds
InterRanger DPS300
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