18
120 Series Loudspeakers and Sounder
Table 2
Tone chart for 24 Vdc 3-to-5 wire and AC 4-to-6 wire operation
Terminal Tone
T1
Two tones: 588 Hz for 0.25 second, 714 Hz for 0.25 second
T2
Swept 600 Hz > 700 Hz in 0.5 second
T3
Constant 700 Hz
T4
700 Hz for 0.25 second, silence for 0.25 second
Routine Maintenance
FIRE/EXPLOSION HAZARD
Do not open the loudspeaker and/or sounder, even they are iso-
lated, when a flammable-gas atmosphere is present.
Failure to observe this warning could result in serious injury or
death.
AVISO DE PERIGO
PERIGO DE FOGO/EXPLOSÃO
Não abra a cobertura na presença de gases perigosos.
A não observação deste aviso pode resultar em graves
lesões ou morte.
Ensure that the unit is maintained in line with the regulations in force
and at least once per year.
• Check for external damage and corrosion and repair and replace
as required.
• Check for water ingress and replace the O-rings if necessary.
• Check all earth connections.
• Check flameproof paths and fixing screws for damage and corrosion.
• Grease all threads, O-rings, and flameproof paths.
