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Document: LT0273 MX4428 MXP Engineering / Technical Manual
Device Information and Programming
Issue 1.5 24 March 2006 Page 3-17
3.8 814I IONISATION SMOKE DETECTOR
3.8.1 GENERAL
The 814I is an ionisation smoke detector. The detector senses the amount of smoke present
and sends this value to the MXP. The MXP makes any decisions as to whether this is an
alarm, fault, normal or whatever. The integral LED is turned on by the MXP when an alarm is
detected.
The remote LED and functional base outputs are programmable for their functionality (refer
to section
3.3).
3.8.2 814I SPECIFICATIONS
Line Connections L(–), L1(+)
Supply Voltage 20Vdc - 40Vdc
Supply Current 330uA (typical quiescent)
Alarm Current 3.0mA (typical)
Remote LED Current 7mA (Tyco E500Mk2)
Dimensions 110mm (diameter) x 55mm (including MUB base)
Weight 81g
Base MUB, 5B, 5BI, 814RB, 814SB, or MkII Sounder Base
3.8.3 MX4428 PROGRAMMING OPTIONS - 814I
The programmable values for the 814I are explained in the following table.
Normally only the mode needs to be programmed, and then only if a functional base or
remote LED is required and its operation is different from the default. Refer to section
3.3.
In some cases the alarm sensitivity (Parameter 1) may need to be changed from the default.
The approved range for Australia is 0.22 MIC X (23) to 0.39 MIC X ( 66). The available range
is 0.22 MIC X (23) to 0.59 MIC X (130). If the alarm sensitivity is changed, the pre-alarm
sensitivity (Parameter 0) should normally be changed to about 75% of the alarm sensitivity.
The remaining parameters should not need changing.