Revision 14
108 August 02, 2019
5.10.4.2 Reference Tab
Reference 1 and 2 runs provide a way to check whether or not the analyzer is correctly
calibrated. It is configured in much the same way as the Calibration run, although this run
only displays the result of 1 run (or the average of 2 or more runs) on the same calibration
gas as used for the calibration run. It does not recalculate the gain as the calibration run
does. To determine whether or not the analyzer needs to be calibrated, run a reference. If the
reading obtained by running the reference is close to the certificate for the calibration cylinder
analyzed, then the analyzer is still correctly calibrated. If not, a calibration should be run
immediately afterwards. The Reference runs can be triggered to start a number of ways such
as: a discrete input, an automatic or manual sequence entry, a timed schedule entry, through
the keypad or simply by hitting the Stream Reference button.
If any analysis alarms have been triggered on the H2S Run (i.e. High or
High High), any calibration run triggered from the application program will
be put into the run queue and not run until the alarm condition(s) has/have
cleared.
5.10.4.3 Zero Tab
The Zero run provides a way to check what the analyzer will read on a gas that contains no
H
2
S. Running a zero run will result in a zero offset being calculated for the analyzer. The Zero
run can be set up similarly to the Calibration and Reference runs, can be triggered to start a
number of ways such as: a discrete input, an automatic or manual sequence entry, a timed
schedule entry, through the keypad or simply by hitting the Stream Zero button.
The Zero run is generally associated with a different solenoid than the Calibration and
Reference runs. The Zero run can be configured like the Calibration run in that it can be set
to run several analyses and take the average to calculate the zero offset.
It is important to note that a suitable zero gas is used for the Zero run. A suitable zero gas
can be ultra-pure nitrogen, or instrument air that is known to contain no H
2
S. If the zero gas
contains a significant amount of H
2
S, the ability of the instrument to operate correctly can be
impaired. If a gas with no H
2
S is unavailable, it is essential that a value reflecting the accurate
H
2
S concentration of the gas used for the zero be entered into the Cal. Gas Concentration
field. If the gas does not contain any H
2
S, the value in this field should be set to zero.
if any analysis alarms have been triggered on the H2S Run (i.e. High or
High High), any zero run triggered from the application program will be put
into the run queue and not run until the alarm condition(s) has/have
cleared.
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