
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)