Welcome to Ampac

Ampac Brands

• EV3000
  • EV100
  • EV3000
• FastSense
  • FastSense Plus
  • FastSense 100
  • FastSense 25
• FireFinder
  • FireFinder Multi-Loop FACP
  • FireFinder Multi-Zone FACP
  • FireFinder Series II
• NZ Series
  • ZoneSense NZ1/NZ1R Single Zone FACP
  • NZ400 Single Zone FACP
  • NZ3200 Single Zone FACP
• ZoneSense PLUS
  • ZoneSense PLUS AR
• SmartGraphics
  • SmartGraphics
• Ancillaries
  • Beam Detectors
    • Fireray 2000
  • Manual Call Points
    • ACP-02 Manual Call Point
    • ACP-03 Manual Call Point
  • Speakers
    • 100mm Ceiling Speaker
    • 200mm Ceiling Speaker
    • Horn Speaker 10 Watts
  • Audible Warning Devices
    • 150mm Fire Bell
    • 200mm Fire Bell
    • Buzzer Mute
    • Vantage Combi
    • Vantage Sounder
    • Vara
    • Vector Sounder
  • Amplified Sound Systems
    • EV120
    • EV20
    • EV40
    • EV60
  • MultiAmp Power Supplies
    • MultiAmp 2A PSU
    • MultiAmp-DH Series
  • Analogue Devices
    • 3 Input Device
    • 3 Input Output Device
    • Ampac Integrated Base Loop Sounder
    • Ampac Powered Loop Beacon
    • Discovery Carbon Monoxide Detector
    • Discovery Multisensor
    • Discovery Thermal C
    • Discovery Thermal D
    • Single Input Device
    • Single Input Output Device
    • XP95 Base
    • XP95 Ionization Smoke Detector
    • XP95 Manual Call Point
    • XP95 Optical Smoke Detector
    • XP95 Thermal A
    • XP95 Thermal B
  • Detectors
    • AHD-06 Addressable Heat Detector
    • NZ Heat Detector
    • Series 60 Ionization Smoke Detector
    • Series 60 Photo-Optical Smoke Detector
    • Series 60 Standard Base
    • Thermal A
    • Thermal B
    • Thermal C
    • Thermal D
    • Air Sampling Unit
  • Door Holders
    • ADH-01 Surface Mounted Door Holder
    • DH1351 - Keeper Plate
    • DH1365
    • DH1368 - Flush Mounting Electro Magnetic Door Hold
    • DH1370/15 - 1370/30 - Electro-Magnetic Door Holder
    • H1330 - Magnetic Door Holder
    • H1369 Floor Mounted Electro Magnetic Door Holder
  • Visual Warning Devices
    • Remote LED
    • Strobe ASL-30
• LoopSense

Ampac Solutions

• NZ Series
• Intelligent Fire Systems
• Alarm/Warning Systems
• Agent Release Systems
• High Sensitivity Detection
• Graphic Interface

MultiAmp-DH Series

The MultiAmp-DH 250mA Door Holder Supply (DHS) provides up to 250mA of current at 24 VDC to operate door holders. The unit can operate as an “Automatic Door Release System” (ADRS) or respond to a secondary control. When configured as an ADRS, conventional detectors are installed and connected directly to the DHS. The detection circuit is monitored for alarm, open, or short circuit conditions. The presence of any one of these conditions will deactivate supply to the door holders and cause doors to be released. Alternatively doors may be released by a switched VDC input to the DHS, derived normally from a Fire Alarm Control Panel (FACP) or security system. The switched VDC input must be between 8 to 30VDC to release the doors. Doors can also be released by pushing the ‘Release/Reset’ button on the front panel of the DHS. The same ‘Release/Reset’ button is used to reset the detector circuit after an alarm condition is experienced. Application of the switched VDC input, as mentioned above, emulates the pressing of the button on the front panel.

The DHS is designed to be surface or recessed mounted on a plastic or metal wall box respectively.