3.5.5 Changing the lower output span
To adjust the lower output
span, from the output
menu select lower and
press enter. A screen
similar to the following
appears.
Use the left and right arrow
keys to select each digit
to be changed and the up
and down arrow keys to
increase or decrease its
value. Press enter to save
(or cancel to keep the
previous value), and
return to output menu.
3.5.6 NAMUR response
The
Aurora H2O
can report measurement failure information
via the analog outputs. The signal presentation of failure
information is consistent with by the recommendations
established by the “User Association of Automation
Technology in Process Industries” (NAMUR) published in
NE43, version 03.03.2003. When configured for 4-20mA
operation, faults and errors are indicated by specific
output levels shown in Figure 40 below:
Error information
Error information
Measurement
information
0 mA
3.6
3.8
4.0
20.0
20.5
21.0
24 mA
Figure 40: NAMUR output value ranges
In normal operation, a valid measurement is indicated
with a signal between 3.8 and 20.5 mA. The lower (zero)
and Upper (span) settings determine the measurement
value assigned to 4.0 and 20.0 mA, respectively.
For the measurement assigned to an output, the
Aurora H2O
continuously checks if an error has occurred.
If an error has occurred, the output will be driven to a
current which is within the error information bands
displayed above. The
Aurora H2O
can signal 3.5 mA
(‘NAMUR low’) or 21.1 mA (‘NAMUR High’). These values
are well within the error information bands as specified
by NAMUR (see Table 3 below).
NOTE:
The
Aurora H2O
will never produce a signal between
3.6-3.8 mA or between 20.5-21.0 mA, to allow for reliable
discrimination between a measurement and an error.
Table 3: Signal messages
Error
Description
Signal
Under
range
The measurement is
less than the calibrated
range of the analyzer
NAMUR
low
Over
range
The measurement is
greater than the calibrated
range of the analyzer
NAMUR
high
Out of
range
Calculation error or
associated measurement
(temp/pressure) invalid
NAMUR
high
No
data
Measurement value has not
been calculated yet
NAMUR
high
No
calibration
Moisture calibration table
empty/invalid
NAMUR
high
30
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