Key Features

  • Heat detector detects rate of rise and fixed temperature
  • Address settable from 001 to 254 by a dedicated programmer
  • Automatic sensitivity compensation
  • Well suited for sensitive environments
  • Corresponds to auto-test function of Velocity MMP series control panel


Velocity Addressable Smoke & Heat Detectors are stylish, low-profile combined photoelectric and heat detectors designed to be used as part of a Velocity MMP fire alarm system.

These analogue addressable detectors are assigned their own unique address at the factory which allows them to be easily identified on the system. 

Smoke sensitivity can be programmed to suit the environment using the control panel’s software and is continuously monitored and reported at the panel. 

The detector’s sophisticated smoke chamber provides the same sensitivity regardless of smoke type and has a chemically etched, stainless steel insect screen to protect the detection elements from insects and airborne contaminants.

The Velocity Addressable Smoke & Heat Detector incorporates a highly-linear thermistor circuit that initiates an alarm when it detects a rapid rise in temperature or at a fixed heat of 57°C.


All components in the Velocity range are UL certified and comply with the requirements of Underwriters Laboratories (UL) 864 Control Units and Accessories for Fire Alarm Systems 10th Edition.

Tech Specs

Detector Element (Smoke)LED (Peak Wavelength 630 nm) Photodiode (High-Output, High-Speed Silicon Photodiode)
Detector Element (Heat)Thermistor (Negative Temperature Coefficient)
LED Visual IndicatorStand-By – Flashing green LED
Alarm – Solid Red LED with Flashing Green
Operating Voltage20 VDC to 38 VDC Peak
System Voltage35 VDC
Stand-by Current200 µA
Alarm Current (with Red LED)5 mA
Sensitivity0.66 %/Ft to 3.49 %/Ft
Fixed Heat Alarm Temperature57 °C (135 °F)
Rate of Rise DetectionResponds to Greater Than 8.3 °C (15 °F) / Min.
Operating Temperature-10 °C to +55 °C (14 °F to 131 °F)
Storage Temperature-20 °C to +60 °C (-4 °F to 140 °F)
Relative Humidity≤ RH 95 % Non-Condensing
Addressing MethodSoft addressing, Non-Volatile EEPROM
Address1 to 254 (Decimal)
Maximum Quantity Per Loop254 Units
Dimensions (W x H)104mm x 42 mm (Detector Head Only)
104mm x 57 mm (Detector Head and VDOT-UB4 Base)
Weight105g (Detector Head Only)170g (Detector Head and VDOT-UB4)
StandardUL268 and UL521



Velocity Addressable Smoke & Heat Detector

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