Products Details

MRI-5251H Low Profile Intelligent Thermal Sensor


From the smallest business to the largest facility or campus, small conventional panels feature large capacity power supplies and easy front panel programming while large intelligent systems lead the market in sophisticated features including distributed emergency audio and are remarkably easy to configure and program. In addition to systems, Secutron™ also offers the most complete line of advanced detection industry with the advanced system features required by emerging fire codes and new protection design practices. Large intelligent networked systems support fully redundant network modularity, graphic display annunciation/monitoring, building management system integration, programmable smoke control and multi-channel emergency communications across buildings, campuses or communities. Secutron™ systems are also supported with the largest selection of detectors, signaling devices and accessory devices, including intelligent power supplies.

Model MRI-5251H provides 190°F (88°C) fixed temperature detection for high temperature applications.
  Intelligent Low Profile Detectors Features:
• Sleek, low profile design
• Detectors are equipped with a built-in analog communications module
• Smoke detectors are available with photoelectric or ionization technology
• Photoelectric detectors are available with additional fixed temperature detection
• Heat detectors are available as fixed temperature or fixed temperature with rate-of-rise detection
• Dual LEDs indicate communications and activate steady when in alarm
• Low profile base provides easy interchangeability
• Low standby current
• Rotary address switches
• Magnetic test feature
• Superior EMI protection
• Sealed against dirt, insects, and back pressure


  Intelligent Low Profile Detectors Specifications:

Voltage Range   Thermal Ratings  
15 - 32 volts DC peak Fixed Temperature Setpoint: 135°F (57°C) Rate of Rise Detection: 15°F/min. (8.3°C/min.) High Temperature: 190°F (88°C)  
Standby Current  
150 uA @ 24 VDC (without communication, LED off)
200 uA@ 24 VDC (one communication every 5 sec. with LED enabled)
Operating Temperature Range  
Ion/Photo: 32°F to 120°F (0°C to 49°C)
Photo with Thermal: 32°F to 100°F (0°C to 38°C) Thermal: -4°F to 100°F (-20°C to 38°C)
High Temperature: -4°F to 150°F (-20°C to 66°C) Pinnacle: 32°F to 100°F (0°C to 38°C)
Photo/Photo with Thermal:
250 uA @ 24 VDC (without communication, LED off)
300 uA@ 24 VDC (one communication every 5 sec. with LED enabled)
230      μA      @      24VDC       (without       communication) 330 μA @ 24VDC (one communication every 5 sec. with LED enabled)
UL Listed Velocity Range  
Ion: 0 - 1200 fpm (0 - 6.1 m/sec)
Photo/Photo with Thermal: 0 - 4000 fpm (0 - 20 m/sec)
Pinnacle: 0 - 4000 fpm (0 - 20 m/sec)
LED Current (max.)  
6.5 mA @ 24 VDC (on)  
Insect Screen Hole Size  
Photo: 0.016 inch (0.41mm) nominal Ion: 0.035 inch (0.89mm) nominal  
2.0 inches (51 mm)
1.66 inches (42 mm) - Pinnacle
Self Diagnostics (PinnacleTM)  
Initiated by control panel Activated by test magnet  
6.1 inches (155 mm) Installed in B210LP Base
4.1 inches (104 mm) Installed in B501 Base
4.0 inches (102 mm) - Pinnacle
Smoke Sensitivity (PinnacleTM)  
9 levels: 0.02, 0.03, 0.05, 0.10, 0.20, 0.50, 1.00, 1.50, 2.00%/ft.
(0.06, 0.10, 0.16, 0.33, 0.66, 1.65, 3.24, 4.85, 6.41%/m obscuration)
Shipping Weight  
Heat: 4.8 oz. (137 g)
Photo/Photo with Heat: 5.2 oz. (147 g) Ion: 5.4 oz. (154 g)
Pinnacle: 5.6ox. (159 g)
Drift Compensation (PinnacleTM)  
High sensitivity maintenance alert signal Low sensitivity maintenance alert signal Maintenance urgent signal  
Relative Humidity  
10% - 93% non condensing