Yokogawa In-Situ Gas Analyzer TDLS200 - Manual (Page 77)

6-20 6-21
IM 11Y01B01-01E-A 6th Edition :Feb 13, 2013-00
<6. BASIC OPERATION>
NON-PROCESS TEMPERATURE
This is the temperature of the non-process gas with two modes
of input:
FIXED – manual input of fixed temperature value
ACTIVE AMBIENT - ambient gas temperature derived from
integral sensor on detector circuit with offset adjustment
(typically -5 deg C) and an adjustable coefficient value (1.0
shown left).
To derive the optimum coefficient value, please contact
Yokogawa with installation and application details. This will
ensure the optimal coefficient value taking into account the
temperature gradient from ambient to process gas temperature
for the non-process purge gases.
NON-PROCESS ALARM SELECTION
This allows the selection or disabling of alarm when then non-
process gas peak height falls below the entered threshold
value.
In this example, the analyzer is configured to FAULT Alarm
when the peak height is lower than 0.001 au (see absorption
spectrum). This value can be determined with assistance from
the Yokogawa factory to suit the specific application.
This alarm function can be used to help detect the leakage or
loss of line locking gas, for example %CO on combustion CO/
CH4 applications
To disable this alarm, simply enter -1 as the threshold value
with the toggle in either Fault or Warning position.
NON-PROCESS ALARM SELECTION
This allows the selection or disabling of alarm when then non-
process gas peak height falls below the entered threshold
value.
In this example, the analyzer is configured to FAULT Alarm
when the peak height is lower than 0.001 au (see absorption
spectrum). This value can be determined with assistance from
the Yokogawa factory to suit the specific application.
This alarm function can be used to help detect the leakage or
loss of line locking gas, for example %CO on combustion CO/
CH4 applications
To disable this alarm, simply enter -1 as the threshold value
with the toggle in either Fault or Warning position.