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OPERATION
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OPTISYS SLM 2100
www.krohne.com 01/2017 - 4002737304 - MA OPTISYS SLM 2100 R04 en
5.7.1 Definition of positions and zones
Figure 5-7: Definition of zones and positions
1 Home position: Home position: Home position: Home position: this position marks the home (or zero point position) of the sensor. After any change of the settings, a
zero point calibration for the level measurement is initiated; the sensor will always return to this position. Additionally
zero point calibration can also be performed by setting a time interval.
2 Start position: Start position: Start position: Start position: this marks the position of sensor in which the sensor starts from and returns to during operation.
3 Blind zone: Blind zone: Blind zone: Blind zone: in this zone the concentration measurement is not active, in order to avoid wrong measurements due to
sunlight or other interferences, before the sensor is immersed into the water. You can prevent unwanted measure-
ment by setting this zone to be 0.3 m / 1 ft below the normal liquid surface.
4 Maximum immersion depth: Maximum immersion depth: Maximum immersion depth: Maximum immersion depth: this is the maximum distance from the home position. The sensor will stop at this depth
if it detects no sludge. Note: the sensor might stop and return at a shorter distance if a rake height is set.
5 Measuring zone: Measuring zone: Measuring zone: Measuring zone: in this zone the sensor delivers its measuring results and the output signal varies from 4...20 mA.
Note! In case that no start position is set, the measuring zone equals the maximum depth. Depending on the settings
the blind zone can either be in- or excluded in the calculation of the current output.
6 Measuring range: Measuring range: Measuring range: Measuring range: distance from liquid surface to bottom of the tank.
7 Fluff layer: Fluff layer: Fluff layer: Fluff layer: fluff or sludge cloud. The concentration has to be set as
“
fluff
”
.
8 Sludge blanket: Sludge blanket: Sludge blanket: Sludge blanket: the concentration has to be set as
“
sludge blanket
”
.
9 Bottom rake zone: Bottom rake zone: Bottom rake zone: Bottom rake zone: here a possibly existing bottom rake operates. The top of this zone is the height where the sensor
always has to stop during lowering to avoid hitting the bottom rake. This has to be set as rake height
rake height rake height rake height in the menu.
10 Floating sludge: Floating sludge: Floating sludge: Floating sludge: sludge which floats on the surface. To avoid wrong measurements the blind zone has to be set below
the floating sludge.