INSTRUCTION MANUAL 036, 038 Spark Gapped Junction Box Revision: 1/92 C o p y r i g h t ( c ) 1 9 8 0 - 1 9 9 2 C a m p b e l l S c i e n t i f i c , I n c .
036, 038 JUNCTION BOX WITH TRANSIENT PROTECTION DESCRIPTION AND INSTALLATION GUIDE 1. OVERVIEW AND DISCLAIMER The 036 and 038 Junction Box with transient protection is designed to minimize damage to instruments connected to wires on which a high voltage could be induced through electrostatic discharge. A common application is using the 036 or 038 to protect data logging equipment from transients that occur on remote sensor lead wires when lightning strikes.
036, 038 SPARK GAPPED JUNCTION BOX 5. THEORY OF OPERATION Where there is more than a few feet of separation between sensors and datalogger, transients can occur because for the tremendous voltage gradient in the ground as a lightening strike is being dispersed. The sensor lead provides a better path for dispersion than the earth, so the current arcs to the sensor leads where the voltage is highest and where there is the least separation between the wires and ground.
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