Following are some of the most frequently asked questions concerning the Agilent 355 Sulfur Chemiluminescence Detector (SCD) and the Agilent 255 Nitrogen Chemiluminescence Detector (NCD).
Can house air be used for the SCD?
House air, and even some zero air generators, should not be used with these systems. Even with the use of in-line sulfur traps, break through can be reached quickly, resulting in high background noise, and low sensitivity problems. In the long term, this can result in shortened tube life, contamination of gas lines, and contamination of the internal plumbing in the controller.
Do I need in-line sulfur traps for my SCD supply gasses?
These traps are recommended in order to provide for peak operational conditions, minimize background noise and to ensure the long-term operation of the equipment.
The pump oil is foaming. Is this a problem?
Not necessarily. Some foaming will occur simply because of the amount of gas flowing through the pump. Excessive foaming can indicate that the pump oil needs to be changed or that the ballast is allowing too much air into the pump.
Do I need special gas regulation for the Dual Plasma Controller?
You need to be able to supply 25 psig pressure for both air and hydrogen (oxygen with the NCD). The Controller is rated to accept 75 psig, but the sensors may be damaged at that pressure. It is acceptable to use a single stage regulator to achieve this pressure on a manifold, so long as the regulator is clean.
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