KROHNE OPTISYS SLM 2100 EN - Manual (Page 53)

OPERATION
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OPTISYS SLM 2100
www.krohne.com 03/2014 - 4002737302 - MA OPTISYS SLM 2100 R02 en
5.7.4 Definition of fluff and blanket concentration
In this menu the concentration of the fluff respectively the sludge blanket has to be set. In level
mode these two concentrations are monitored. During the measurement cycle the Fluff
concentration is tracked first, while the sensor is moving down.
The factory settings of these values are:
1. Concentration fluff: 0.5 g/l
2. Concentration sludge blanket: 5 g/l
5.7.5 Definition in zone tracking mode
Applying the zone tracking mode requires additional setup of the following points:
Hysteresis Hysteresis Hysteresis Hysteresis: The sludge concentration definition sludge blanket + hysteresis defines the limit to
correct the sensor position and track the sludge level again.
Example Example Example Example: Definition blanket level is set to 5 g/l and hysteresis is set the 0.6 g/l
The concentration 5 g/l is searched, if found the sensor is moving in the parking position.
When a concentration increase above 5.6 g/l is detected while the sensor is in parking position it
will be moved up for position correction and for tracking the sludge level again.
Tracking time Tracking time Tracking time Tracking time: Definition of the time period the sensor is remaining in parking position, when the
time elapsed the sludge level will be tracked again.
Tracking position Tracking position Tracking position Tracking position: Definition of the relative parking position of the sensor above the sludge level.
5.7.6 Rake guard / external trigger
To protect the sensor and cable from being damaged or destructed by rakes or other moving
parts, the meter has two control inputs (CI1 and CI2), which function as NO contact control input
for the connection of an external limit switch (you have to buy this switch with another
manufacturer). Such limit switch can have 2 functions (depending which mode is selected in the
menu):
1. Rake guard Rake guard Rake guard Rake guard: In this mode the limit switch is used to interrupt the sampling process in case the
rake is passing the meter and the sensor is reeled up to avoid collisions and damage. Both con-
trol inputs can be set to rake guard via the sub menus C 3.3/3.4 Control input 1 / 2. For further
information refer to
Function tables on page 45. For information concerning the electrical con-
nection of a limit switch refer to Electrical connection of control inputs on page 31.
2. External trigger External trigger External trigger External trigger: In this mode the limit switch is used to trigger the sampling process. When
the moving device (e.g. a rake) contacts the limit switch, the sampling process starts. Both con-
trol inputs can be set to external trigger via the sub menus C 3.3/3.4 Control input 1 / 2 and C
1.5 start signal. For further information refer to
Function tables on page 45. For information
concerning the electrical connection of a limit switch refer to Electrical connection of control
inputs on page 31.
.book Page 53 Wednesday, April 30, 2014 1:39 PM