Protection is necessary at all electrical inputs and outputs to properly safeguard equipment. A typical circuit is shown in Figure 1 for data transmission from building to building (RS422) and from a field transmitter back to a building or control room (4-20 mA).
Figure 1. 1800 and 1669 typical connections
Bourns 1820 models provide both line to ground and line to line protection and are designed for use on differential signals (such as RS422 or RS485) and most current loops. 1810 models provide line to ground protection for two separate circuits and are designed for use on ground referenced signals (such as RS232) and 4-20 mA loops where the return wire is grounded at the protector. The 1811 and 1821 models provide the same protection modes for high frequency applications.
Four outdoor applications (such as field mounted 4-20 mA transmitters) the 1669 series can be used in the field, together with an 1800 series protector at the controller side.
Special versions of 1669 are available in accordance with the ATEX Directive 94/9/EC for use on both intrinsically safe and flameproof circuits, and the corresponding 1800 series unit for intrinsically safe circuits at the control room (1820-28-IS).
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