TELEDYNE API T108 Series, Addendum To Operational Manual

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Introduction Teledyne API – Model T108 Addendum to T100 Manual
14 07268C DCN8258
1.6.1. CO
2
Source
A source of CO
2
that is free of sulfides is required for accurate zero calibration of the instrument. If the
‘zero gas’ used to zero the instrument is contaminated, the process gas will read artificially low,
sometimes even showing a negative TS concentration. Standard CO
2
bottles can have unacceptably high
levels of sulfur compounds in them. Beverage grade CO
2
should be used as a diluent as well as the ‘zero
gas’ source for calibration of the T108.
Since CO
2
strongly quenches the SO
2
fluorescence reaction, the instrument sensitivity will be greatly
reduced when using CO
2
as the balance gas. Therefore, it is imperative that the T108 be calibrated using
CO
2
as the balance gas when it will be measuring TS in a gas matrix that is primarily CO
2
.
CO
2
liquefies when compressed, and sulfur compounds do not stay dissolved in liquid CO
2
. Therefore it
is not practical to use compressed gas bottles of H
2
S in CO
2
for calibration purposes. TAPI strongly
recommends that H
2
S in N
2
bottles be used for calibration of the T108, and that a calibrator be used to mix
zero gas (CO
2
) into the cal gas stream, making the final calibration gas mostly CO
2
.
1.7. TS AND ZERO AIR SCRUBBERS
There are two charcoal scrubbers in the analyzer chassis of the T108. The scrubber canister on the outside
of the rear panel of the analyzer is a standard charcoal scrubber that supplies zero air for the diluter
assembly. The second scrubber is located inside the analyzer behind the sample filter. This scrubber uses
a specially impregnated charcoal (TAPI Part# CH_52) which is especially effective in scrubbing TS
gasses. This filter is used to scrub TS from the inlet sample gas for use in zero calibrating the analyzer.
1.8. 501TS TEMPERATURE CONTROLLER
A front-panel-mounted, programmable controller maintains the heater temperature. The manual for the
controller is included with the documentation for this instrument. The controller has been set up at the
factory and should not need adjustments, but if deemed necessary, please contact Technical Support (see
Section 2.6).
To view the actual temperature, PV – Present Value, or the set point value, SV – Set-point Value, press
the PV/SV button in the lower left corner of the controller. If a different set point value is required or to
perform the Auto Tune function, please contact Technical Support (Section 2.6).
Figure 1-6. 501TS Controller Interface