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4
Operation
Typical Operating Conditions
52
Table 6
lists the recommended starting conditions for SCD and
NCD methods. These conditions should provide acceptable
results for a wide variety of applications. However, optimize
these conditions as needed to improve the performance of the
specific application.
Table 6
Typical operating conditions, SCD and NCD
Parameter
Base temperature, °C
Burner temperature, °C
Chiller temperature
Upper H
flow, mL/min
2
Lower H
flow, mL/min
2
Oxidizer flow, mL/min
O3 Generator flow, mL/min
O3 Generator high voltage
Vacuum pump
Burner pressure, Torr, typical reading
Reactor pressure, Torr (read only)
The checkout methods for the SCD and NCD also provide
example parameters for balancing good detection limit, good
selectivity, and reasonable ceramic tube life. In any XCD
method:
• Always keep oxidizer gas flowing through the burner.
• The firmware will not allow hydrogen to flow into the burner
while there is no oxidizer to protect the system.
During startup and shutdown, always turn on the pump first
and turn off the pump last to prevent contamination or damage.
SCD
NCD
250
250
800
900
N/A
On
40
N/A
10
3
50, Air
8, Oxygen
On
On
On
On
On
On
< 425 Torr
< 120 Torr
Should be below
Should be below
7 Torr
5 Torr
SCD and NCD User Manual
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Troubleshooting
