Yokogawa In-Situ Gas Analyzer TDLS200 - Manual (Page 112)

8-12
IM 11Y01B01-01E-A 6th Edition :Feb 13, 2013-00
<8. VALIDATION AND CALIBRATION>
There are several critical parameters that must be preconfigured in the TDLS200 software when using the
automatic validation sequence. These parameters MUST be correctly set otherwise the analyzer will report
false/incorrect validation results.
• Check Gas Concentration specifies the concentration (ppm or %) of the gas within the offline flow cell.
• Check Gas Pathlength specifies the optical path length of the offline flow cell (typically 20”, 30”, 40”, 60” or
80” – please check the flow cell configuration for details).
• Check Gas Temperature can be selected for either Fixed or Active.
o If Active Temperature, then follow on screen instructions. This is typical for a heat traced controlled flow
cell that has an active 4-20mA signal proportional to the cell temperature
o If Fixed Temperature, then enter in the temperature of the gas within the offline flow cell. Remember that
this value will be used whenever the auto validate is used so try to select a value that is representative of
when the auto validate might take place (day/night, etc.) Press ENT to proceed.
• Check Gas Pressure specifies the pressure at which the gas within the offline line flow cell.
• Valve Selection specifies which analyzer’s solenoid valve driver is used for the check gas.
• Check Gas Purge Time specifies how long the check gas will purge the flow cell – please allow sufficient
time for volume exchanges to ensure only the validation
gas is being measured and that all previous
process gas has been thoroughly purged out.
• Process Gas Purge Time specifies how long process gas
will purge the flow cell before up-dating the results and
making the 4-20mA signals real-time. Please ensure that
the time is sufficient to ensure all validation gases have
been purged from the flow cell and that only process gas
is being measured as the 4-20mA outputs will return to
live mode when the validation is completed
• Analog Output Mode specifies Block, Track, or Hold of all
4 to 20 mA output during offline check. Note that the
mA value of the Block mode can be set elsewhere in the
software.