Ion Science MiniPID - Manual (Page 17)

MINIPID 3PIN MANUAL Ion Science Ltd
Page 17 of 27
Unrivalled Detection. www.ionscience.com
Intrinsic Safety
Schematic Block diagram
Intrinsic Safety circuit implementation
It is very important to abide by the stated temperature, power, voltage and current ratings.
This product is designed to drop into a standard LEL sensor position, however:
LEL sensors take considerable current and are often zoned by a separate 125 mA fuse and other suitable
upstream voltage limiting devices. Depending upon the current required by the monitoring electronic circuits
the MiniPID may either share the same zoned 125 mA fuse or the electronics can be located in another
zone whose power is supplied by another fuse.
If two zones are required, then very low current signals may be passed between the two zones by isolating
resistors to limit any potentially shared high current between the two zones thus maintaining separate zone
integrity.