Detcon MCX-32-N4X - Manual (Page 40)

Model MCX-32
Model MCX-32 Instruction Manual Rev.2.3 Page 34 of 49
Alarm Settings
All sensors have three alarm settings. These are labeled ‘ALM1’, ‘ALM2’, and ‘ALM3” for Alarm 1, Alarm
2, and Alarm 3 respectively. The alarm relays can be configured for ascending or descending mode. In
ascending mode the relay will be activated when the concentration is above the alarm threshold. The alarm
relays can also be activated in descending mode.
In this mode, the alarm relays will activate when the
concentration is below the alarm threshold.
Typically these alarm set points are pre-determined by the user, and set for each sensor. Upon initialization of
a channel these set points are set to the default value for the type of sensor that is connected, and set as
‘ascending’. For sensors that are connected via a DA-4 or DI-4 module, these set points are default values
selected by the controller. These set point values should be checked, and changed if they are not correct.
Likewise, the alarm should be checked to see if the alarm ascending/descending setting is correct. Typically
alarms are ascending, with the exception of oxygen sensors. To set the values in the alarm fields, select the
appropriate field for the alarm. If selecting the alarm set-point, the display will prompt for a numeric input.
The Ascending/Descending will change from ‘ASC’ to ‘DEC’ or from ‘DEC’ to ‘ASC’ when selected.
Figure 39 Alarm Level Set
There are three banks of alarms that the sensor can be assigned to. The RL-4 Bank Select is used to select
which bank the sensor is assigned. Selecting the bank (or banks) that the sensor is to be assigned to, will cause
the bank selected to be highlighted in the display.
Figure 40 Alarm Bank 2 Select