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Alfa Laval Other Indication Automation Valves.

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When Indication is all you Need

Indication Units for LKB/LKLA, SRC, ARC and ARC-SB

Description
Other IndicationThese indication units have to be installed laterally between the air operated actuator and the valve.
The code numbers can be found in the Alfa Laval Product Program for the different valve types.

All switches are EMC approved according to:

- EN 50081-1, Generic emission standard, commercial and light industry.
- EN 50082-2, Generic immunity standard, industrial environment.
- pr EN 60947-5-2, Product family standard: Proximity switches.
- KA 2791.30 section 5.5 EMC, Tetra Pak Corporate Standard.
All tested requirements are met.
The pull-up or pull-down resistance in the input stage of the PLC must be 1-10 k ohms to ensure a proper reading of the signal from the sensors.
The wire connection can be different.

General description of different types of switches:
 
Micro switch
A micro switch can be compared with a standard light switch but in a very small size and light in weight, a so called subminature switch. It is activated mechanically by a roller leaf. Standard function is normally open (NO), normally closed (NC) and is always a digital signal (on/off).
The features of an environment proof sealed subminature switch are: Small size and light in weight, with ample electrical capacity, precision operation and long life. The micro switch used in indication units is furthermore enclosed within a corrosion-resistant aluminium housing to seal the switch contact and terminals against contamination.
 
Inductive proximity switch
This type of switch is a non-contact electronic switch. It consists of an oscillator which creates high frequency electromagnetic fields which radiate from the sensing face of the switch. Every approaching conductive metal (damping target) causes a reduction of the electromagnetic field. The result is a voltage change of the oscillator. This analogue signal is converted by a Trigger circuit into an on/off signal and the output is amplified.
 
Hall proximity switch
The Hall prox. switches are also non-contact electronic switching elements. The sensor registers a magnetic field (north pole) and consists of a Hall element (a type of a transistor) matching part, an amplifier and an output part. The output signal is always on/off, digital and the switching frequency is higher than the normal inductive switch or the micro switch. The Hall prox. switch is ideal for modern computer processing. NPN and PNP are two types of transistors. The difference is the composition of positive or negative semi conductive materials.
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Electrical data and connection 
 
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