NS 5.14 Firmware
2–22 4900002262 rev. B 3-23-21
DO Alarm Setup
The DO Alarm Setup parameter sets the functionality of the Assignable
Alarm. Add the hexadecimal values according to Table 2–3 below for each fault
chosen to trigger the Assignable Alarm. Convert the resulting hexadecimal
value to a decimal value and enter the number for normally deactivated relay
functionality. Add ‘1’ to the resulting decimal value to switch to normally
activated functionality.
In the example above, the hexadecimal value of 0002000 converts to decimal
value of 8192, which when entered results in a normally deactivated relay
triggered by the Concentra High Alarm. Entering a value of 8193 would
result in a normally activated relay (fail safe) triggered by the Concentra High
Alarm.
The ISO method is only valid for sample pressures greater than
10000 mBar (10 bar), and therefore should not be used for
samples with pipeline pressures less than 10000 mbar. The
analyzer firmware assumes that any pipeline pressure less than
10 bar is the same as 10 bar, so the measured Dew Point value
will not change for sample pressures from 0 to 10 bar. For Natural
Gas sample pressures in the 0 to 10000 mbar range,
SpectraSensors recommends users select ASTM1 or ASTM2
methods. For air or nitrogen samples, SpectraSensors
recommends the Arden Buck method (Dew Point Method = 3).
Table 2–3 Assignable Alarm functionality
Bit Hex Value Functionality
0 0000001 Normally closed or Power Fail (always on).
1 0000002 Any alarm active (general fault).
2 0000004 Laser power is too low.
3 0000008 Laser power is too high.
<SET PARAMETER MODE>
Dew Point Method
0
0:ISO1:AS12:AS23:AB
<SET PARAMETER MODE>
DO Alarm Setup
8192
Enter decimal value
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