Emerson ROSEMOUNT Xstream X2 Series - Fig. 3-5: Low Pre-Alarm and Main Alarm

Emerson Process Management GmbH & Co. OHG3-34
X-STREAM X2FD
Instruction Manual
HASXMDE-IM-EX
01/2015
• Defi ning low pre-alarm and main alarm
Standard mode:
An alarm results in the assigned relay being
activated.
Settings:
• Level 1 > Level 2
• Level 1-Function: Low
• Level 2-Function: Low
Failsafe mode:
An alarm results in the assigned relay being
deactivated.
Settings:
• Level 1 > Level 2
• Level 1-Function: Low FS
• Level 2-Function: Low FS
If an alarm is active, a corresponding mes-
sage is displayed in line 4 of the measurement
display.
Fig. 3-5: Low pre-alarm and main alarm
3.9 Checking the settings
If two lower limits are set with one limit lower
than the other, a pre-alarm is triggered when
the measured concentration falls below the
fi rst limit (area B). If no corrective measures
are taken and the concentration falls below
the second level (area C), a main alarm is
triggered.
Up to two alarms may be active per channel
at any one time.
Concentration
Activated
Zeit
Concentration level
Pre-alarm limit
Main alarm limit
Deactivated
Activated
Deactivated
Activated
Deactivated
Activated
Dectivated
ABC
On
Off
Relay condition
Failsafe mode
Status message on front panel
Standard mode
Main alarm falling
Pre-alarm falling
Main alarm falling
Pre-alarm falling