- After the card turns pink, do I need to replace it?
No. The card will turn from pink back to blue once it is exposed to an atmosphere that is dryer than the rating on the card.
- How long will it take for the card to turn from blue to pink (or pink to blue)?
The time it takes for the card to turn from one color to the other depends on the amount of humidity the card is exposed to and the temperature of exposure. Normally, the cards will change color within minutes of exposure to the ambient conditions.
- What is the effect on temperature on the cards? Will they still work?
The humidity rating on the cards changes at the rate of 2½% of rated value per 10°F away from 75°F. That is, for a card that is rated at 30%, when viewing it at a temperature of 35°, the true value becomes 27%. (2.5 x 4 = 10% rating change, applied to a rating of 30% = 3%, 30% - 3% = 27%.) It works in the opposite direction for higher temperatures.
- What does the thread callout mean (¾-14 straight pipe IAW PPP-P-420, Class D)? Do I need a ¾” hole in my container to mount this device (TA356, TA350, TA354 and their derivatives)?
This thread is misleading because it actually has a maximum major diameter of 1.027”. It is commonly used on the small bung of a 55 gallon drum. The reason our humidity indicators have this thread is that they were initially used most commonly on 55 gallon drums.
- How do I replace the humidity indicator card inside the plug and what wrench size is required?
Follow these simple steps:
1. Hold housing by the 1.375” hex flange.
2. Insert a ½” hex wrench (Allen wrench) into the lock nut & turn counter-clockwise to loosen.
3. Remove lock nut.
4. Remove Teflon washer.
5. Remove old humidity indicator card.
6. Install new humidity indicator card.
7. Install Teflon washer.
8. Install lock nut.
9. Hold housing by the 1.375” hex flange & torque lock nut to 50+/-5 inch-pounds.
- Can I get a custom humidity indicator?
Yes. AGM's Engineering Department has designed hundreds of modified and custom versions for previous customers.
- What pressure will these items withstand?
All of our plug designs will withstand 10 psig in either direction while our TA284 series is guaranteed to 500 psig outward for high pressure applications.
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