MT-12/24-R Multitone Electronic Appliance

MT-12/24-R Multitone Electronic Appliance

  • Field‑selectable choice of eight nationally and internationally recognized alerting signals
  • Two installer‑selectable sound output levels
  • NFPA and ANSI compliant
  • UL Listed for indoor or outdoor use
  • Low average current draw

The Wheelock MT‑12/24-R appliance is an audible alarm-indicating device engineered to comply with temporal pattern specifications without requiring an additional code mechanism. It offers a selection of eight tone patterns and two sound output levels. The temporal (Code 3) horn and tone patterns meet ANSI/ NFPA/ISO requirements for standard emergency evacuation signaling. The extended temperature range satisfies all severe-weather outdoor applications.

   
Horn (continuous)  
Current (maximum) at 12 V: High output: 176 mA VDC, 172 mA FWR Standard output: 34 mA VDC, 39 mA VDC
Current (maximum) at 24 V: High output: 108 mA VDC, 87 mA FWR Standard output:44 mA VDC, 45 mA FWR
Pattern Description: Broadband continuous horn
Sound output* at 10 ft (3 m): High output: 92 dBA Standard output: 87 dBA
Bell  
Current (maximum) at 12 V: High output: 95 mA VDC, 98 mA FWR Standard output: 20 mA VDC, 23 mA FWR
Current (maximum) at 24 V: High output: 53 mA VDC and 51 mA FWR Standard output: 24 mA VDC, 28 mA FWR
Pattern Description: 1560 Hz modulated (0.7 sec on, repeat)
Sound output* at 10 ft (3 m): High output: 86 dBA Standard output: 80 dBA
Horn (march-time)  
Current (maximum) at 12 V: High output: 142 mA VDC, 172 mA FWR Standard output: 34 mA VDC, 39 mA FWR
Current (maximum) at 24 V: High output: 104 mA VDC, 87 mA FWR Standard output: 38 mA VDC, 45 mA FWR
Pattern Description: Horn (0.25 sec on, 0.25 sec off, repeat)
Sound output* at 10 ft (3 m): High output: 89 dBA Standard output: 84 dBA
Horn (Code 3)  
Current (maximum) at 12 V: High output: 142 mA VDC, 172 mA FWR Standard output: 34 mA VDC, 39 mA FWR
Current (maximum) at 24 V: High output: 91 mA VDC, 87 mA FWR Standard output: 35 mA VDC, 45 mA FWR
Pattern Description: Horn (ANSI S3.41 temporal pattern)
Sound output* at 10 ft (3 m): High output: 88 dBA Standard output: 83 dBA
Tone (Code 3)  
Current (maximum) at 12 V: High output: 105 mA VDC, 103 mA FWR Standard output: 21 mA VDC, 23 mA FWR
Current (maximum) at 24 V: High output: 75 mA VDC, 60 mA FWR Standard output: 35 mA VDC, 36 mA FWR
Pattern Description: 500 Hz (ANSI S3.41 temporal pattern
Sound output* at 10 ft (3 m): High output: 85 dBA Standard output: 80 dBA
Slow Whoop:  
Current (maximum) at 12 V: High output: 142 mA VDC and FWR Standard output: 35 mA VDC, 38 mA FWR
Current (maximum) at 24 V: High output: 98 mA VDC, 92 mA FWR Standard output: 37 mA VDC, 42 mA FWR
Pattern Description: 500 Hz to 1200 Hz sweep (4 sec on, 0.5 sec off, repeat)
Sound output* at 10 ft (3 m): High output: 90 Standard output: 85 dBA
Siren  
Current (maximum) at 12 V: High output: 152 mA VDC, 153 mA FWR Standard output: 30 mA VDC, 34 mA FWR
Current (maximum) at 24 V: High output: 104 mA VDC, 92 mA FWR Standard output: 36 mA VDC, 40 mA FWR
Pattern Description: 600 Hz to 1200 Hz sweep (1.0  sec on, repeat)
Sound output* at 10 ft (3 m): High output: 89 dBA Standard output: 84 dBA
High‑Low  
Current (maximum) at 12 V: High output: 114 mA VDC, 116 mA FWR Standard output:26 mA VDC, 29 mA FWR
Current (maximum) at 24 V: High output: 57 mA VDC; 58 mA FWR Standard output: 26 mA VDC, 32 mA FWR
Pattern Description: 1000 Hz and 800 Hz (0.25 sec on, alternate)
Sound output* at 10 ft (3 m): High output: 86 dBA Standard output: 81 dBA
   
Input Voltage (nominal): 12 VDC or FWR or24 VDC or FWR
Voltage Range: 12 V: 8.0 V to 17.5 V 24 V: 16.0 V to 33.0 V
Relative Humidity: Up to 95%, non‑condensing
Temperature (Operating): -31°F to +150°F (-35°C to +66°C)
   
Dimensions (H x W x D): 5.125 in. x 5.125 in. x 2.0 in. (13 cm x 13 cm x 5.1 cm)
Material: High‑impact thermoplastic