Staff Answer
Jan 18, 2026 - 10:49 PM
The 2 main causes for H2S calibration failure are:
1. Calibration gas fade - This happens for a bunch of reasons detailed here (https://idealcalibrations.com/blog/wh...) but essentially it means you need to replace your calgas cylinder. If it's from us and within expiration we'll do so free of charge. If it's past expiration you definitely need a new cylinder. 4-gas mix is usually only good for 2 years.
2. Sensor is dying - if you're sure the gas is good (check the gas FIRST) then it's time to replace this sensor. You can find it here: https://idealcalibrations.com/sensor-...
Hope that helps!
1. Calibration gas fade - This happens for a bunch of reasons detailed here (https://idealcalibrations.com/blog/wh...) but essentially it means you need to replace your calgas cylinder. If it's from us and within expiration we'll do so free of charge. If it's past expiration you definitely need a new cylinder. 4-gas mix is usually only good for 2 years.
2. Sensor is dying - if you're sure the gas is good (check the gas FIRST) then it's time to replace this sensor. You can find it here: https://idealcalibrations.com/sensor-...
Hope that helps!
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