CM4 Four-Point Continuous Monitor
CM4 Technical Manual
8-4
When the simulation mode ends (by user or time-out), the printer will
print “ALARM SIMULATION MODE ENDING.”
The Optics Test card can be used to simulate a gas stain in this mode.
The simulated gas stain will drive all the enabled CM4 features as
if an actual gas stain was detected on the current Chemcassette
®
window.
In this mode, the Model CM4 will not recognize or report:
• Gate Open Fault
• Low Flow Fault
• High Background Fault
• End of Chemcassette
®
Fault
While the mode is active, the fifth line of the front panel display will
show:
ALM SIM MODE=XXX SEC
where “xxx” is the number of seconds before the mode resets.
Instructions
Follow these steps to simulate an alarm:
1. Exit the Monitor Mode
2. Enable the Alarm Test Mode in menu entry 4.2.2. Press
ENTER.
3. Open the gate and place the Optics Test Card (Stain 1) in the
optics block. Close the gate.
4. Press MONITOR.
Wait until the fifth line on the display shows:
ALM SIM MODE = xxx SEC
5. Open the gate and place the Optics Test Card (Stain 2) in the
optics block. Close the gate.
• The Model CM4 will produce full scale alarms on all four
points initially. Wait for the concentration to decay. Typically,
this takes about two minutes.
6. Press RESET to reset any alarms.
7. Reinstall the proper Chemcassette
®
when testing is
complete.
The simulated alarm test mode remains active until:
• Power is cycled
• 15 minutes elapse in this mode
• The mode is canceled via menu selection 4.2.2
The Alarm Simulation Mode is documented on printouts and in the
Model CM4’s Alarm History. The serial printer output shows the start
and end of the alarm simulation. Also, the abbreviation (SIM) is printed
on alarm reports to indicate the Model CM4 was in simulation mode
when the alarm occurred.
shows a sample printout.
NOTE:
Hydrogen Sulfide (H
2
S) creates an unusually dark stain on the
Hydrogen Sulfide Chemcassette
®
, P/N 874304. Because of this, the
algorithm will sometimes not report an alarm level concentration
when alarm simulation is attempted with the standard optics test
card. Work-arounds include temporarily setting the alarm levels
lower. For more information, contact Honeywell Analytics Service.
This condition affects the Hydrogen Sulfide Chemcassette
®
P/N 874304 only. Hydrogen Sulfide detection with the Hydrides
Chemcassette
®
, P/N 874300 is not affected.
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