Spectrex 20/20MI - Mini Triple IR (IR3) Flame Detector - Manual (Page 24)

Spectrex Inc. - SharpEye TM Mini IR3 Flame Detector Manual – TM 787100, Rev. D April 2011
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4.2.1 Optional latching
The detector has an optional latched alarm output capability, which operates
according to the programmable function. If selected, upon the detection of a fire,
the detection signal is latched until manually reset (disconnecting the power supply
or performing a manual BIT). Latching affects the ALARM RELAY, 4-20mA output,
the ALARM LED.
4.2.2 Built-In-Test
When the programmable function “Alarm BIT” at YES successful, Manual BIT will
activate the alarm relay for 3 sec. and the 4-20mA output will provide 15mA for 3
sec.
4.3 Detector Mode Setup
4.3.1 Detector setting
See Section 4.3.3 for default factory settings
The 20/20 MI incorporates several functions that can be set by the customer
using:
Spectrex Host software, which will be supplied for each detector shipment,
refer to manual TM 784050 for programming instructions. The Host software
enables you to change functions as described in 4.3.2.
4.3.2. Detector’s various functions
a. Sensitivity Ranges
The detector offers four (4) sensitivity settings. The settings refer to the
gasoline fire of 1ft
2
from
low sensitivity of 33 ft (10 m) to 132 ft (40m) for 20/20MI-1
8.2 ft (2.5m) to 33 ft (10m) for 20/20MI-3
For other types of fuel sensitivity, refer to Table 3.
Table 9: Sensitivity range
20/20MI-1 Detection
Range
20/20MI-3 Detection
Range ft(m)
Sensitivity
Ft m
Sensitivity
ft m
10 30 10 2.5 8.2 2.5
20 66 20 5 16.5 5
30 100 30 7.5 24.7 7.5
40 132 40 10 33 10