KROHNE OPTISYS SLM 2100 EN - Manual (Page 12)

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DEVICE DESCRIPTION
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OPTISYS SLM 2100
www.krohne.com 03/2014 - 4002737302 - MA OPTISYS SLM 2100 R02 en
Cable drum assembly and heater unit
The cable drum helps to move the sensor up and down in the basin. It is mounted directly on the
motor shaft of a synchronous motor, hidden behind the drum mounting plate. The cable drum
always moves with a very constant speed. Since the diameter of the cable roll in the drum varies,
the speed of the sensor varies. That is why the sensor moves slower during the end of the
sampling.
The heater unit is located behind the drum mounting plate. In conjunction with the fan it
maintains a stable temperature inside the enclosure of the meter.
Guide roller
The guide roller helps to keep the cable in place during the measuring process.
Sensor
The sensor contains a near-infrared light source and a receiver. Both are positioned in such a
way that the emitted near-infrared light has to pass through the liquid before reaching the
receiver.
Pickup board & axle board
The pickup board is mounted on a spring loaded lever arm and transfers power and
communication signals to the cable drum.
The axle board on the cable drum is powered contactless ("inductively") from the pickup board. It
communicates with the main electronics unit via the pickup board and with the sensor via an
optical interface.
Cable feedthroughs
The four M20 cable feedthroughs are for the connection of power, signal and control cables.
Safety switch
The safety switch located on the top left corner of the cable drum compartment is a protective
device, which de-energizes the motor when the front door is opened in order to avoid danger due
to moving parts inside the meter.
Cleaning unit (optional)
The cleaning unit, mounted under the device, consist of a valve and a spraying system to keep
the sensor and cable free of deposits ensuring low maintenance efforts of OPTISYS SLM 2100.
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