ABB LLT100, Руководство по функциональной безопасности

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Ch A P TER 2
Description
The LLT100 is specifically made for industrial applications and harsh environments. It provides
continuous, non-contact level measurement capabilities for process automation and inventory
management in industries. It provides precise measurement of any solid or liquid independently from
the material properties. It also has dust and fog penetration capabilities with a class 1 laser.
Using a pulsed laser to perform time-of-flight measurements, the LLT100 provides accurate distance
measurements using a LIDAR sensor as input and a 4–20 mA loop as output. The unit is powered
thought the 4–20 mA loop on two wires. A HART 7 communication interface (not used as safety
function) is available on the same two wires.
Depending on the type of accessory, it can meet the demands of hazardous area locations, and high
pressure and high temperature applications. Ordering specifications are described in the LLT100 data
sheet (AD2). Refer to this data sheet to get exact measuring range, operating temperature and accuracy
specifications. The LLT100 is explosion-proof class 1, division 1 (zone 1).
For dusty applications, the dust tube prevents dust deposition on the window, significantly decreasing
the need for preventive maintenance. For very high dust levels, a purge ring can be added to the dust
tube to provide an air flow to enhance the dust protection. High temperature applications are made
possible by the addition of a cooling tube. Cooling tubes with different process interfaces and different
pressure ratings are available.
Additional documentation on LLT100 is available for download at http://www.abb.com/laserlevel .
Industrial enclosure,
IP67 and explosion proof
Class1/Division 1 (also
zone 1)
Pressure-rated
flanges available
Rotating display with
touch through-the-glass
interface
Powered from
4–20 mA loop, HART
communication
Eye-safe, class 1
laser beam