It must be emphasized that detectors can not be compared on the basis of their noise or response. They can only be compared on the basis of their sensitivity or signal-to-noise ratio at a specific solute concentration.
6. Detector Sensitivity – Minimum Detectable Concentration (MDC)– (XD)-Detector sensitivity can also be defined as that concentration that will produce a signal equivalent to twice the noise or, as that change in the physical property being measured that will provide a signal equivalent to twice the noise. The sensitivity defined in concentration units is, in general, more useful to the analyst.
7.Detector
Dispersion – (
) –
This is generally not significant in GC detectors
8. Detector Time Constant – (Dt) – The overall time constant of the sensor and electronics is given in milliseconds. It is of interest in high speed chromatography.
9. Pressure Sensitivity - (DP) – The pressure sensitivity of a detector is the output that results from unit change in pressure. It is usually specified in V/p.s.i. or V/kg/m2 . It is important in detector design.
10. Flow Sensitivity – (DQ) – The flow sensitivity is the output that results from unit change in flow rate. It is specified in V/ml/min. It is important in detector design.
11. Temperature Sensitivity – (DT) – Thetemperaturesensitivityisdefined as the output that results from 1oC change in temperature. It is given in V/oC.
