Fire Rakshak-DTS(Distributed Temperature sensing)

Technica Fire Rakshak

Fire Rakshak is a Linear Heat Detector System specifically designed for Industrial Applications

The Fire Rakshak Distributed Temperature Sensing (DTS) system connects to a distributed fiber optic cable (FireFiber) and determines temperature and distance data at thousands of points along the length of the cable. The fiber optic cable is installed within the asset to be protected and this cable acts as the sensing element.

The Fire Rakshak Sensor Control Unit is responsible for generating alarms based upon the calculated temperature profile. The Fire Rakshak DTS can therefore detect the location of a hot spot on up to a 5km length of fiber optic cable with unrivaled precision. The system is able to monitor the movement of the hot spot, or multiple hot spots, in terms of physical position, temperature and also in real-time. Fire Rakshak Distributed Temperature Sensing Technology provides a line type heat detector solution vastly superior to conventional copper based or multipoint heat detector.

Front Panel & Key Features

  • 1U half rack width - compact design
  • RS485 MODBUS interface in master slave topology
  • Full temperature trace available via MODBUS registers
  • Relay outputs for alarm interface
  • USB interface for convenient connectivity
  • Low power consumption (8.5W)

Front Panel Components

Item
Description
Type
Function
A Main Power switch Push button with GREEN indicator Push to turn on. Press and hold >5s to turn off
Steady Green: Powered ON
B USB Interface Mini-B Direct PC interface
C Control Interface DB-25 female Control inputs and system light outputs
D Indicator: System error YELLOW LED Indicates system error
Steady Yellow: Fiber break error
Flashing Yellow: Data save error
E Indicator: Alarm RED LED Indicates temperature alarm
Steady Red: Temperature alarm
F Optics power switch Optics power switch Switches laser on or off.
Push and hold >3s to toggle between on / off states
Steady Blue: Optics power is ON
Flashing Blue: Data acquisition in progress.
Optics powered + Laser is active
OFF: Optics power is OFF
G Sensor cable connector FC/APC connector Connection point for 62.5um graded index multimode sensing fibre
H Alarm reset Push button with RED indicator Resets the triggered alarm.
Press and hold >2s to reset alarms
I Indicator: Relay error ORANGE LED Indicates that a relay output has failed to close
J Relay output connector DB-25 female Relay outputs. Max 48VDC 1A.
K RS-485 3-pin 5.08mm terminal block RS-485 communication TOP: GND
MID: B (-ve)
BOT: A (+ve)
L Power input 2-pin 5.08mm terminal block Main power in: 24VDC
TOP: -ve
BOT: +ve

System Specifications

Measurement Range 500 metres 1,500 metres
Temperature Resolution 0.5°C @ 5 seconds 1.6°C @ 5 seconds
Spatial Resolution Best 1.6 m 3m
Sampling resolution 1m 2m
Measurement time 5s < t < 20min 5s < t < 20min
Channels 1
Optical fiber type Multimode 62.5um/125um (50um option available resolution lower spec),
FC/APC connector
Zone Information 10 Configurable smart zones
Power Requirements 24VDC, 8.5W
Alarm Types Maximum temperature Minimum temperature Rate of change
Switches Power on/off, Optics power control on/off, alarm reset
Indicators Temperature alarm, relay error, optics power, system error
Communication interface & Protocol RS485 & USB. MODBUS supported functions 0x02, 0x03, 0x04, 0x05,
0x06, 0x10 Relay outputs – 3 system, 5 user power, general alarm, system error,
(laser and sensor fault), (DB25)
Data Storage 4GB
Operating Environment Operating temperature:-10°C to +50°C Storage temperature:-40°C to +85°C Temp sensing range: cable dependent
Physical Dimensions H*D*W: 44mm*246mm*220mm
Weight 2.0 kg

Applications Summary

  • Main hangar and Maintenance Hangers
  • Inside tunnels and subways.
  • Electrical bus wiring and electrical Panel.
  • Escalator and travelator
  • Airport waiting lounge
  • ATC Tower and other facilities Buildings
  • Airport Power generation and Battery Room
  • Catering and food court
  • Cargo building