Workshop - What to Look for in Gas Detection and Measurement Instrumentation (35)

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Slide 35 of 76

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Electrochemical Sensors

Disadvantages
- Not specific to single gas without use of filters or other methods
- HCl - zero drift due to bias voltage, zero drift at high temperatures, affected by rapid changes in RH%
- NH₃ - not entirely catalytic - electrolyte is used up, zero drift at high temperatures
Examples of Instruments: Dräger PAC III, Dräger Model 190, Quest SafeLog 100, Biosystems Toxi Ultra, Several Multi-Gas models

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