Setting Concentration Alarms; Fig. 3-3: Arrangement Of Concentration Thresholds - Emerson Rosemount Xstream Series Instruction Manual Addendum

Instruction Manual
HASXEDE-IM-EX
03/2012
3.9.5

Setting Concentration Alarms

Ch1
Concentration
Alarm Monitor:
LoLo Level:
Lo Level:
Hi Level:
HiHi Level:
Hysteresis:
States..
Note!
HiHi and LoLo designate pre-alarms,
Hi and Lo designate main alarms.
Fig. 3-3: Arrangement of Concentration Thresholds
Emerson Process Management GmbH & Co. OHG
3.9 Checking the Settings
On
50.000 ppm
100.000 ppm
400.000 ppm
600.000 ppm
10.000 ppm
X-STREAM XEFD
Note!
If concentration alarms are not being used,
continue with 3-26.
Press until SETUP is displayed, then
left
open ALARMS - CONCENTRATION
Multi-channel unit:
Select the channel to be setup in SELECT
COMPONENT.
Four concentration limits can be set for each
channel:
"Lo" and "Hi" enframe the expected gas
concentration,
"LoLo" equals or is below "Lo",
"HiHi" equals or is above "Hi".
See the figure to the left for an explanation.
If you enter values for any threshold, the
above given order has to be considered. A
message is displayed, if an entered value
does no comply with this condition.
Should the measured concentration go bey-
ond one of the threshold levels (areas B, C, D
& E in the figure), a message is displayed in
the message line of the measurement display,
the NAMUR pictogram appears (bell) and a
corresponding digital output is activated, if
assigned.
A hysteresis avoids oscillating alarms in
case the concentration is fluctuating around
a threshold.
3-25