Proper use of humidity indicators?

[Graeme Tolton]

I am sure this has been beaten to death, but i really cant find exactly the info i am looking for.

I have just aquired a 1981 capitano to replace my davey. 900 hrs on unit and it runs very well. I plan to add a moisture eye to the system after the 32" filter and before the pmv.

My question is regarding the 10/20/30 or 20/40/60 indicator discs. I dont know at what rh i should be replacing filters. I currently dont have either of the discs, but i see that august industries sells the 20/40/60 discs.
Any thoughts?
Thanks.

 

[steveharriss]

You are better with the 10/20/30 discs. Change when the 10% shows pink and you won't have any issue with moisture. The 20% is too late. This advice was initially picked up on YD from Iain/HSM.

 

[Graeme Tolton]

Ok, that was what i was thinking. Does anyone have an online source for the 10/20/30??

 

[steveharriss]

Plugs and Plug Cards ? In the UK I'd suggest Iain

 

[divingtactics]

Ray from Coltri sells them: Coltri Sub High Pressure Breathing Air Compressors Supplies from Ray Contreras Sales
He shipped quick and his postage was reasonable too.

 

[Graeme Tolton]

Awesome. Thanks!

 

[divingtactics]

It is interesting to note that as soon as you remove them from the sealed wrapper, they start turning from blue to magenta. When you install it, put it in the moisture indicator housing top part and apply a little heat from a heatgun or hairdryer. This will turn it back to blue again and keep the heat on it all the time as you screw the top on the moisture indicator housing, then start up your compressor and run it for a couple of minutes to build some pressure. These can be reused many times in between filter changes by using the heat gun again to restore the colour back to blue.

 

[rjack321]

It is interesting to note that as soon as you remove them from the sealed wrapper, they start turning from blue to magenta. When you install it, put it in the moisture indicator housing top part and apply a little heat from a heatgun or hairdryer. This will turn it back to blue again and keep the heat on it all the time as you screw the top on the moisture indicator housing, then start up your compressor and run it for a couple of minutes to build some pressure. These can be reused many times in between filter changes by using the heat gun again to restore the colour back to blue.

A hair dryer is safer, you can scorch them with a heat gun. If you only have the one 32" tower, then change that filter when the 10% portion of the disk goes pink.

 

[divingtactics]

A hair dryer is safer, you can scorch them with a heat gun.

I have a variable temperature heat gun and find that 100 degrees C seems to work best.