Servomex 07931001B, Руководство оператора

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© Servomex Group Limited. 2020 07931001B revision 6
Adjust burst phase cal
When the correct DC Voltage is achieved it is possible to synchronize the phase
timing of the reference burst ref Figure 4-33
(ABurst) by selecting ‘Adjust Burst
Phase Cal’.
This is not to be confused with Adjust Gas Cal.
In case of actual process gas temperature above 900 °C after alignment of the
transmitter and receiver with optimal photodiode DC level of 1-2V one should check
raw CO signal between sample points 200 and 300.
If peak-to-peak signal amplitude exceed 40,000
–
80,000 at optimal detector signal
voltage, one should avoid performing
“Adjust Burst Phase Cal” as “hot” CO
absorption lines appear around Aburst can distort Aburst signal, compromising
optimal demodulation phase and as a result compromise CO+CH4 measurements
without reporting fault.
“Adjust Burst Phase Cal” should only be done when CO is low and
close to zero and
CO raw signal is around zero.
In case of deviation in spectra from expected please save support package,
describe installation and contact Servomex’s service to seek further advice on
correct demodulation phase.
Note : Calibration may be compromised after using Adjust Burst Phase Cal.