Standard Article number 23106100163 23106150163 23106800163 TAS (external tone selection via closed function of the control voltage) Article number 23106100162 23106150162 23106800162 Article numbers for [...] Alternating tone 128 : EN54-3 Alternating tone 131 Alternating tone, UK BS 5839-1 (fire alarm, railway crossing) 142 Alternating tone 146 Alternating tone, France NFS 32-001 (fire alarm) 1 Die-cast aluminium [...] Continuous tone, Finland (all-clear signal) 55 Continuous tone, PFEER gasalarm 57 w. EN54-3 Continuous tone, UK BS 5839-1 60 Continuous tone 63 Continuous tone 67 Continuous tone, Germany KTA 3901 (all-clear