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MX4428 MXP Engineering / Technical Manual Document: LT0273
Device Information and Programming
Page 3-18 24 March 2006 Issue 1.5
Parameter Description Default
Value Functional Base Control Remote LED Control
0 Circuit Alarm Circuit Alarm
1 Circuit Alarm Relay
2 Circuit Alarm Point Alarm
4 Relay Circuit Alarm
5 Relay Relay
6 Relay Point Alarm
8 Point Alarm Circuit Alarm
9 Point Alarm Relay
Mode
10 Point Alarm Point Alarm
0
P0 Pre Alarm Threshold 50
Alarm Threshold
Value Threshold
23 0.22 MICX (Alternate)
66 0.39 MICX (Default)
P1
130 0.59 MICX
66
P2 Fault Limit (i.e. values below this are assumed to indicate a
detector fault)
10
P3 Dirty Alert Limit (i.e. a “dirty alert” will be raised if the
tracked “clean air” value reaches this limit)
120
b3:b0 Filter Divisor 3 P4
b7:b4 Step Limit 5
P5 Tracking Interval i.e. the interval at which the tracked “clean
air” value is adjusted.
30 (minutes)
P6 Tracking adjustment - fixed at 1 in MXP 1
The following global parameters which may be set at the MX4428 affect all applicable points
on all MXPs.
MX4428 Reference Description Default
8XXI UPPER
TRACKING LIMIT
Ionisation Upper Tracking Limit
(i.e. the maximum assumed value for
clean air)
120 (MXP
Default)