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SITRANS LR200 with mA/HART
Operating Instructions, 05/2019, A5E32337676-AE
179
B.3.1
Sensor Mode
This parameter controls the input. Depending on the reference point used, the measurement
reports either Level, Space, or Distance. By default Sensor Mode is set to Level.
Operation
Description
Reference point
NO SERVICE Measurement and associated loop current not being
updated. Device defaults to Fail-safe mode
1)
.
LEVEL
Distance to material surface
Low Calibration Point (pro-
cess empty level)
SPACE
Distance to material surface
High Calibration Point (pro-
cess full level)
DISTANCE
Distance to material surface
Sensor reference point
1)
See Fail-safe Mode (Page 180).
You also have the option to put the device out of service, in which case the device defaults
to Fail-safe mode, and the reported level depends on the device type. A standard device
reports the last valid reading, and a NAMUR NE 43-compliant device reports the user-
defined value for Material Level (3.58 mA by default).
①
Sensor reference point
⑤
4 mA 0%
②
High calibration point
⑥
Distance
③
20 mA 100%
⑦
Level
④
Space
⑧
Low calibration point
B.3.2
Loss of Echo (LOE)
A loss of echo (LOE) occurs when the calculated measurement is judged to be unreliable
because the echo confidence value has dropped below the echo confidence threshold.
Confidence (2.8.6.1.) (Page 114) describes the quality of an echo. Higher values represent
higher quality.
Echo threshold (2.8.4.3.) (Page 112) defines the minimum confidence value required for an
echo to be accepted as valid and evaluated.
If the LOE condition persists beyond the time limit set in Timer (2.5.2.) (Page 103) the LCD
displays the Service Required icon, and the text region displays the fault code S: 0 and the
text LOE.
Содержание SITRANS LR200 7ML5422
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