| GENERAL CHARACTERISTICS ITEM DESCRIPTION | THE CHEMICAL VAPOR SAMPLER UNIT (CVSU) IS THE MAIN ASSEMBLY OF NSN 6665-01-537-6901 CHEMICAL VAPOR SAMPLER SYSTEM (CVSS). THE UNIT INCLUDES THE DATA COMMUNICATION PORT, THE DC ELECTRICAL POWER CONNECTION, THE ELECTRONIC CONTROL MODULE OPERATED BY THE BUTTONS ON THE CONTROL PANEL AND THE PNEUMATIC UNIT |