Visonic Ltd. of Bloomfield, Conn., releases an anti-masking line of motion detectors that alerts the user if the detector has been tampered with. The line includes Visonic’s DUET AM C/O and DUO 220AM and the TOWER 10AM, 12AM and 20AM. The DUET AM C/O is a professional- grade, commercial dual-technology detector. In the anti-masking mode, two normally closed relay outputs are available for alarm and trouble conditions. Additionally, DUET AM C/O can be operated with both Form A and Form B relay outputs when the anti-masking function is disabled. The DUO 220AM is a microcomputer- controlled dual-technology intrusion detector. The PIR and MW technologies are combined to help reduce false alarms.
