Honeywell ACM 150 Manual To Installation, Operation, And Maintenance page 70

ACM 150
NOTE
The Alarm 1 and Alarm 2 set point levels and the programmable relay groups
are to be determined and set by EHS professionals. They must not be reset to
different levels and the program groups must not be changed in any way unless
determined and authorized by those professionals.
Standard Non-Latching Relays
The standard ACM 150 monitor configuration has the relays remain closed as long as
the concentration of a gas exceeds a set point. Once the gas concentration reaches
0 ppm, the relay resets and opens. This is preferred by most users because they
connect these relays to PLCs or external controls that latch, i.e. remain closed until
manually reset.
Special Latching Relays
If you do not have latching relays in your control scheme, then Honeywell Analytics
recommends that the ACM 150 monitor relays be changed to latch. This is a simple
configuration change in the ACM 150 monitor software. When set to latch, the relays
must be manually reset to open. This is done by selecting "Reset" in the alarms log.
DANGER!
Resetting a latching relay could cause a leak to restart and expose employees
to hazardous conditions. Make certain that the leak causing the initial alarm
event has been corrected before resetting a latching relay.
DANGER!
La réinitialisation d'un relais de verrouillage pourrait provoquer une fuite de redémarrer
et d'exposer les employés à des conditions dangereuses . Assurez-vous que la fuite
provoquant l' alarme initiale événement a été corrigée avant la réinitialisation d'un
relais de verrouillage .
Action plan
Since the monitor can detect multiple gases per port, the action plan can be tailored
for each gas. Every user should have a plan of action for Alarm 1/Alarm 2 incidents.
Refer to "Form 2: Plan for ACM 150 incidents" on page 76 for a suggested plan
and format.
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