Emerson Process Management GmbH & Co. OHG
3-22
X-STREAM XEFD
Instruction Manual
HASXEDE-IM-EX
07/2017
3.9 Checking the Settings
Next, select the output range:
• 0-20 mA
(dead zero) generates a 20 mA
signal, if a concentration is measured at
the upper limit of the signal range. A 0 mA
signal is generated if the sample gas con-
centration equals the value specified with
“
LowScale
”.
•
4-20 mA
(life zero): A 4 mA signal is gener-
ated if the concentration equals the value
specified with “
Low Scale
”, thus enabling
to detect e.g. a broken cable.
“
FailMode
” selects the output’s behaviour un
-
der failure conditions, considering or not, the
NAMUR recommendation NE 43.
Available options:
Track
: NE 43 not considered; output always
correlates with the measured value.
HIGH + 10%
: NE 43 failure signal level:
‘above’.
LOW – 10%
: NE 43 failure signal level:
‘below’.
Further information on NE 43 is provided on
the next page.
If “Signal” is assigned a concentration signal ,
and “Auto scale” is set to
No
, in the next lines
enter the concentrations to output 0/4 mA
(“Low scale”) or 20 mA (“High scale”).
If either “
Auto scale
” is
Yes
, or “
Signal
” not
assigned a concentration signal, the levels
are set with default values and not editable.
Signal:
Comp1
OutRange:
0-20 mA
Low Scale:
0.00
Max Scale:
100.00
AutoScale:
Yes
FailMode:
Live
0/4 mA:
0.00
20 mA:
100.00
Hold:
No
