Yokogawa Extractive Oxygen Gas Analyzer TDLS220 - Manual (Page 37)

<6 BASIC OPERATION> 6-7
IM 11Y01B02-01E-A 4th Edition September 11, 2012-00
The TREND SCREEN is identical for BASIC or
ADVANCED MENUS. It allows the user to trend up to the
last 750 minutes (of current day) of data for:
REFRESH - The trend will not update automatically, use
the refresh button to update the trend
GAS 1 – analyzer reading of gas 1 concentration
STDEV1 – the standard deviation of 25 consecutive
concentration readings of Gas 1
GAS 2 – analyzer reading of gas 2 concentration
STDEV2 – the standard deviation of 25 consecutive
concentration readings of Gas 2
TRANS. – transmission % of laser light through the
process
LTS – analyzer laser temperature set point
LT – analyzer laser temperature
PCP – peak center position for the absorption peak
TEMP – process gas temperature
PRES – process gas pressure
Alongside the selection buttons the current value is
displayed. When selecting the information to trend user
will be prompted to enter minimum value, maximum value
and time to trend.
ADVANCED CONFIGURE MENU
PROCESS PATH LENGTH – DO NOT ADJUST, factory
set typical 40” (distance laser beam is exposed to
process gas).
PROCESS PRESSURE – allows selection of FIXED (value
entered into software), ACTIVE (analyzer fed pressure
value from external transducer), or CONTROL (cell
pressure controlled at a desired value with a proportional
valve and pump). In Active mode, a Back-Up value can be
entered, in case of active input failure.
TEMPERATURE – allows selection of FIXED (value
entered into software), ACTIVE INPUT (analyzer fed
temperature value from external transducer), ACTIVE
AMBIENT (ambient gas temperature derived from internal
sensor), ACTIVE PEAKS (value calculated from the
measurement spectrum), or CONTROL (cell temperature
controlled at a desired value with a heater and relay). In
Active Input mode, a Back-Up value can be entered, in
case of active input failure.
NON-PROCESS PARAMETER – if the analyzer is not
purged with a gas that is free of the component being
measured (i.e. oxygen), this allows user to enter the Path
Length, Pressure, Temperature and Concentration of
the purge gas that is present in the non-measurement
optical path (internal analyzer optical path).. For details,
see section 4.4. Use this feature if the TDLS220 is being
purged with Instrument Air (I/A)