Galvanic Applied Sciences 943-TGXeNA, Руководство по эксплуатации

Страница: 60 / 149

Revision 5 60 August 2021
then press ENTER to move to the next analog output. When on Analog Output 4, pressing
this button again will move back to Analog Output 1.
The configuration options available for all four analog outputs are identical. The output
parameters available are listed in Table 12.
Table 12: Analog Output Parameters
Parameter Description
None No data will be output on the analog output.
Air Demand
The Air Demand value will be output on the analog output. Scale
ranges from negative Full Scale (4 mA) to positive Full Scale
(20mA)
H2S %, SO2 %, COS %,
CS2 %
The percentage value of the H
2
S or SO
2
or COS or CS
2
concentration will be output on the analog output. Scale ranges
from 0 (4 mA) to Full Scale (20 mA)
Sigma S
The sum of the H
2
S and SO
2
concentrations, in percent, will be
output on the analog output. Scale ranges from 0 (4 mA) to Full
Scale (20 mA)
H2S/SO2 Ratio
The ratio of H
2
S concentration to SO
2
concentration will be
output on the analog output. Scale ranges from 0 (4 mA) to Full
Scale (20 mA)
H2 / Analog Output 3
The signal being input into Analog Input 3 (from a hydrogen
sensor or other measurement device that outputs an analog
signal) will be output on the analog output. Scale ranges from 0
(4 mA) to Full Scale (20 mA)
H2S ppm, SO2 ppm,
COS ppm, CS2 ppm
The parts per million value of the H
2
S or SO
2
or COS or CS
2
concentration will be output on the analog output. PPM
concentration is obtained by multiplying the percentage
concentration by 10 000, so full scale should be chosen
accordingly. Scale ranges from 0 (4 mA) to Full Scale (20 mA).
The full-scale value for the analog output can be entered into the Full Scale field by
highlighting it using the FIELD NEXT / FIELD PREV keys, then pressing ENTER to enter
data entry mode. Enter in the desired full-scale value, then press ENTER again to save.
Press EXIT to discard any changes.
Above the
Full Scale
field are two check boxes marked
Track
and
Hold
. When Track is
selected, the analog output value will track with the displayed concentration value even when
the analyzer is in back purge mode; hence, when Track is selected, during zero calibration
cycles and any other times when the analyzer is placed into back purge mode, the signal
output to the DCS will be zero. When Hold is selected, the analog output value will hold the
last good process value any time the analyzer switches into back purge mode until the
analyzer is back on line in sampling mode; in this way, the analog output will never drop to
zero even during zero calibration cycles or other times the analyzer is placed into back purge
mode. Highlight the desired analog output behaviour by using the FIELD NEXT / FIELD
PREV keys to highlight the desired choice, then pressing ENTER to select.
After making any changes on this sub-panel, it will be necessary to save them permanently
to the analyzer. Use the FIELD NEXT / FIELD PREV keys to highlight the
Save
button in the
bottom right-hand corner of the sub-panel, then press ENTER to save changes to the
analyzer. Alternatively, to revert all changes made on this sub-panel, use the FIELD NEXT /
FIELD PREV keys to highlight the Revert button and press ENTER to confirm.