User Manual

Features 3
2 Technical Description
➣ In this chapter…
Features
page 3
Principles of Operation
page 3
2.1 Features
The SharpEye Model 20/20MPI Mini Triple IR (IR3) Flame Detector includes
the following features:
 Detection Range: up to 140 ft. (43m) for a 1 ft
2
(0.1m
2
) n-heptane
pan fire
 Ultra High Immunity to False Alarms (see False Alarms Prevention
on page 10)
 Advanced Digital Processing of the Dynamic Characteristics of
Fire: Flickering, Threshold correlation and Ratio
 Three Separate IR Channels: Between 3-5 microns
 Field Programmable Sensitivity: four ranges
 Two Response Levels: Warning and Detection
 Solar Blind
 Microprocessor Based: Digital signal processing
 Built In Test (BIT): Manual and Automatic
 Two Options of Electrical Interface:
 20/20MPI-R: Dry contact relays
 20/20MPI-M: 0-20 mA output (stepped)
 Functional Approvals:
 EN54-10 Pending per VdS
 FM approved per FM3260
2.2 Principles of Operation
2.2.1 Hydrocarbon Fire Detection
The triple IR flame detector detects all conceivable types of hydrocarbon
fires, i.e. any fire, which emits CO2.
2.2.2 Identifying the CO2 Peak
The hydrocarbon fire is characterized by a typical radiation emission. The
CO2 peak emits intense radiation in the spectral band between 4.2 µ - 4.5 µ
and weaker radiation intensity outside this spectral band.