ZCK-1 Overview
INSTALLATION AND MAINTENANCE INSTRUCTIONS ZCK-1, ZCK-1E, ZCK-1EG, ZCK-1EN and ZCK-50 Zonecheck Keyswitch for Control and Monitoring of the Zonecheck Flow Switch Tester Electrical Specifications Operating Voltage: Tested to EN 61010-1 3825 Ohio Avenue, St. Charles, Illinois 60174 1-800-SENSOR2, FAX:.