The heavy duty industrial master station(s) shall be Alpha Communications® / Ring model AA906 or approved equivalent. Master(s) shall have clear two-way communications. Master(s) shall be both dust and splash resistant. It shall be cast in silumin alloy and sprayed in olive green hardened lacquer finish. The station's one-piece rubber keyboard shall be protected by a stainless steel faceplate with call-warning lamp. Two (2) sealed nipples shall be provided for cable entry at the base of the station and master(s) shall require simple home-run wiring. Master(s) shall be surface wall mounted. Master(s) may be used directly outdoors and are designed to operate in a temperature range of minus 20 degrees to plus 50 degrees Celsius. Master(s) may be used with the optional (model GD519) privacy handset, for confidentiality or softspeaking, where required.
Contractor shall observe all local and national electrical and building codes.
||24V DC+/- 20%
||300 - 5000 Hz
||0 dB (1 mW/600 ohm)
||normal: -12 dBm
||max + 4dBm
|Tone Signalling Level:
|External Loudspeaker Impedance:
||16 to 50 ohms
Height: 11.5" (280mm) (incl. nipples)
Width: 6.3" (160mm)
Depth: 4.0" (102mm) (w/o handset)
Depth: 6.6" (165mm) (w/ handset)