36
SCD and NCD User Manual
3
System Description
Specifications
This section lists the published specifications for a new
detector, installed on a new Agilent 7890B GC, when used in a
typical laboratory environment.
8355 SCD
8255 NCD
Specification
Minimum Detection Limit (MDL),
typical
< 0.5 pg (S)/s (2x Agilent data system
ASTM noise)
Linearity
> 10
4
Selectivity
> 2 x 10
7
response S/response C
2
Precision
*
and stability
*
Typically, based on one run per 30 minutes, collected over 24 hours. For example, a 24
hour time span will contain approximately 48 replicate runs.
< 2 % RSD over 2 hours
< 5 % RSD over 24 hours
Typical time to reach 800 °C from
ambient
10 min
Specification
Minimum Detection Limit, typical
< 3 pg (N)/s (2x Agilent data system
ASTM noise)
Linearity
> 10
4
Selectivity
> 2 x 10
7
response N/response C
Area repeatability
< 1.5 % RSD over 8 hours
< 2 % RSD over 18 hours
Typical time to reach 800 °C from
ambient
10 min