KROHNE OPTISYS SLM 2100 EN - Manual (Page 52)

5
OPERATION
52
OPTISYS SLM 2100
www.krohne.com 03/2014 - 4002737302 - MA OPTISYS SLM 2100 R02 en
5.7.2 Measuring function
In this menu point the measuring function can be selected. There are 4 different settings:
1. Level mode Level mode Level mode Level mode: In this mode the level of the sludge blanket and the fluff is monitored. Thus the
meter measures the height of two distinctly different concentrations simultaneously. The two
heights from the last measurement cycle are held at the current outputs of the device and are
updated at the end of every further cycle.
2. Profile mode Profile mode Profile mode Profile mode: The profile measurement mode allows to create a sludge level profile concen-
tration in g/l versus position. When the mode is selected a third measurement result page can
be displayed. On this measurement page a graphical representation of the measured sludge
level profile is shown which gives a general overview of the collected information. In this mea-
suring mode the current channel A outputs a value proportional to the distance of the sensor
(height / depth) and the current channel B outputs a value proportional to the measured con-
centration in g/l.
3. Zone tracking Zone tracking Zone tracking Zone tracking: The zone tracking mode allows to track a sludge level, thus the sensor will re-
main in the process in a parking position above the sludge concentration to track. When the
tracking time elapses the sensor will be moved down and the sludge level searching will be re-
peated. When the sludge level has been found the sensor is moved back in the parking position
again. When the sludge level is increasing and is reaching the parking position of the sensor,
its position will be moved up until the sludge concentration drops below the user defined limit.
Starting from this position the sludge level will be tracked again.
4. Manual operations Manual operations Manual operations Manual operations: If set to manual operation, the sensor is reeled up out of the medium and
no longer react to any trigger (timer or control input). The two current outputs are "frozen" at
the last measurement value and the arrow keys on the keypad can be used to move the sensor
manually. This function is used for initial configuration and calibration of the device. It also
makes it easy to perform maintenance activities.
5.7.3 Measuring mode
The level measurement can be set in two different ways:
1. Height: The height height height height of the sludge blanket/fluff measured from the bottom of the tank is dis-
played. Zero (resp. 4 mA) is at the bottom of the tank.
2. Depth: The depth depth depth depth of the sludge blanket/fluff measured from the liquid surface is displayed. "Ze-
ro" (resp. 4 mA) is at the liquid surface.
The height/depth height/depth height/depth height/depth ratio of the sensor is calculated in the following way:
Height/depth = maximum immersion depth - blind zone - start position
INFORMATION!
As soon the user enters the manual operation mode the current outputs are frozen. After
completion of the settings and return to normal measuring mode, the current outputs and
display are reset to "0". If the user needs an actual reading right away, please press arrow down
to trigger a manual measuring cycle.
.book Page 52 Wednesday, April 30, 2014 1:39 PM