MNA0010, Revision B October 2014
28
CHAPTER 3
Modes of Operation
After the unit has been calibrated on a known gas source, it can be used in normal operation.
There are six main modes of operation once the system has been powered up and the self
test/warm up period is completed:
RUN, Calibration, Set Alarms, Alarms Active, Fault, and
SELF-TEST.
As shown in Figure 28, the modes of operation are accessible once in RUN mode. You can
access the Cal or Set alarm modes by pressing the mode switch. CAL and Set Alarm 1 & Set
Alarm 2 are sequentially accessed. Alarms active and Fault modes are not accessible
manually. The Model 7100P Portable analyzer will determine if an alarm or fault is active, and
then the modes will be activated.
The analyzer has a 2 minute time-out (factory default). If no buttons are pressed within 2
minutes, the analyzer will resume to normal RUN mode operation.
The alarm outputs are “frozen” during calibration and alarm set modes… the alarm conditions
just prior to entering the cal/set alarm mode are held until returning back to RUN mode.
PURGE &
POW ER UP
SELF TEST &
W ARM UP
RUN MODE
CAL MODE
SET / VIEW
ALARM 1
SET / VIEW
ALARM 2
FAULT
CONFIGURE
SYSTEM
ALARM(S)
ENABLED
FAULT STATUS
FREEZE ALARMS
Alarms to Normal
after timeout
Figure 28