0-20 mA to fibre converter for analog position monitoring
28 August 2002
Opto-Electronics
The LL122 is an optical fibre analog current interface used in many process and industrial control systems. Available from Advanced Digital Devices, the interface converts a 0-20 mA signal to an optical signal which is sent through the fibre-optic cable. Another LL122 converter at the remote end re-converts the light signal back into a 0-20 mA electrical signal.
These circuits are short-circuit protected and are designed to tolerate the abuse often found in the industrial arena. The units are provided with built-in mains power supplies and are housed in grey powder-coated metal boxes which offer protection in harsh industrial environments. The units serve to extend the range of a 0-20 mA control signals via an opto-decoupler to prevent damage to equipment by induced lightning surges.
The LL122 is suited for 850 nm multimode as standard. Optional is 1300 nm multimode/singlemode. ST connectors are industry standard with multimode, and (optional) SC for multimode and FC for singlemode. The units are suitable for use in environmental conditions: 0-45°C and 0-95% noncondensing humidity.
For more information: ADD South Africa, 011 314 3150, addvid@mweb.co.za
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