Toxic Gas Sensor Performance

Response of H2S Sensor When Exposed to 25 PPM Gas

Typical signal output over lifespan of sensor

Response of H2S Sensor When Exposed to 25 PPM Gas

Electrochemical sensor performance

• Sensor performance is affected by temperature
• Effects mathematically predictable, but may vary between sensors
• In general, response (T₉₀) slower in very cold temperatures

• EC sensor sensitivity is generally lower in cold temperatures; higher in hot temperatures
• Most instruments have temperature compensation that automatically corrects readings as a function of temperature
• Can also correct readings by calibrating instrument near temperature in which it will be used

• In general, uncorrected "zero" (baseline) output of sensor is lower in cold temperatures; higher in hot temperatures
• Effects mathematically predictable; can be corrected by means of temperature compensation

Performance after electronic temperature compensation

Effects of humidity on EC sensors

• Sudden changes in humidity can cause "transientys" in readings
• Sensor generally stabilizes rapidly
• Avoid breathing into sensor or touching with sweaty hand

Commonly Available Toxic Sensors