INSTRUCTION MANUAL A21 REL-12 Relay Driver Revision: 12/91 C o p y r i g h t ( c ) 1 9 8 1 - 1 9 9 1 C a m p b e l l S c i e n t i f i c , I n c .
Warranty and Assistance The A21 REL-12 RELAY DRIVER is warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products.
A21 REL-12 RELAY DRIVER FUNCTION: Provide drive capability for four external relays controlled by the CR10, 21X, or CR7 dataloggers. The A21 REL-12 is powered by a 12 V source on the relay coil. CONNECTIONS: +12 V External 12 V source Ground Low side of external source REL COM Low side of device under control CONTACT RATING: DC AC - 1 Amp at 20 V 0.3 Amp at 120 V COIL CURRENT: 13 mA/relay REL NC Normally closed relay output to device under control CTRL To datalogger control port.
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