Table 5.

Advantages and disadvantages of gas detection technologies [86,87,88,89,90,91].

Technology	Advantages	Disadvantages
GC	Wide range of fault gases Highest accuracy and repeatability	Long time required to complete a test Expensive Frequent calibrations needed Auxiliary (carrier) gas needed Maintenance cost
PAS	Wide range of fault gases Can detect/measure very low (ppm and ppb) gas concentrations Low maintenance	Results are sensitive to the wave number range of the optical filters and their absorption characteristics Accuracy influenced by temperature, pressure, and vibration Limited ability to measure high gas concentrations Interfering gases can effect accuracy
IC	Operate under extreme temperatures, vibration, or in corrosive atmospheres	Limited ability to detect very low gas concentrations
TCD	Fast response Stable Wide measuring range Simple construction Robust	Sensitive to interfering gases Reaction due to heating wire Heating element reacts with gas
NDIR	Simultaneous multi-gas measurement No required calibrations Low maintenance Fast gas measurement time	Limited ability to detect very low gas concentrations Interfering gases can effect accuracy
IR	Uses only physical technique Can be used in inert atmospheres	Not all gases have IR absorption Sequential monitoring is slower on multi point analyzers and also more user expertise required
NIR	Simultaneous multi-gas measurement Non-frequent calibrations Low maintenance	Limited ability to measure high gas concentrations Interfering gases can effect accuracy
FTIR	Simultaneous multi-gas measurement	Accuracy influenced by moisture
FC	Small size	Periodic replacement Single gas measurement
Micro-electronic sensor	Small size	Single gas measurement
Electrochemical cell	Small size Working at high temperature is possible	Frequent calibrations needed Short/limited life time Single gas measurement Cross sensitivity to other gases