|Air Dryers
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What does it mean when the color of an IDG series dew point indicator has changed?
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The dew point indicator can be used to determine the state of dryness of the membrane air dryer outlet air.
When the absorbent is blue or pink:
Dew point indicator is blue... Dry state
Dew point indicator is pink… Wet state
When the absorbent is green or yellow:
Dew point indicator is green... Dry state
Dew point indicator is yellow... Wet state
Keep in mind that it takes time for the color of the dew point indicator to change.
In addition, volatile oils and other gases contained in the compressed air may be absorbed, causing discoloration of the absorbent and indicating colors other than blue (green) or pink (yellow).
In such cases, it is difficult to check the state of dryness of the membrane air dryer outlet air, so replace the dew point indicator regularly.
If the same condition occurs immediately after replacement, contact SMC.
Example: Dew point indicator colored brown or black
