User guide

8-12
IM 11Y01B01-01E-A 6th Edition :Feb 13, 2013-00
<8. VALIDATION AND CALIBRATION>
There are several critical parameters that must be precongured 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 species the concentration (ppm or %) of the gas within the ofine ow cell.
• Check Gas Pathlength species the optical path length of the ofine ow cell (typically 20”, 30”, 40”, 60” or
80” – please check the ow cell conguration 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 ow
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 ofine ow 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 species the pressure at which the gas within the ofine line ow cell.
• Valve Selection species which analyzer’s solenoid valve driver is used for the check gas.
• Check Gas Purge Time species how long the check gas will purge the ow cell – please allow sufcient
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 species how long process gas
will purge the ow cell before up-dating the results and
making the 4-20mA signals real-time. Please ensure that
the time is sufcient to ensure all validation gases have
been purged from the ow 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 species Block, Track, or Hold of all
4 to 20 mA output during ofine check. Note that the
mA value of the Block mode can be set elsewhere in the
software.
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