Humidity Indicator Plugs

Humidity Indicator Plugs for Indicator Cards

Humidity indicator plugs are designed for mounting on reusable or long-term storage containers or in any other humidity-controlled enclosure to hold humidity indicator cards and detect changes in the relative humidity of the space being monitored.


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What are humidity indicator plugs?

A humidity indicator plug is a device that is installed into an enclosure wall and securely holds a humidity indicator card visibly in its head.

Humidity indicator plugs are made from varying materials, including but not limited to brass with zinc plating, anodized aluminum, and steel. Some may have glass covers – visibly similar to wristwatches – over the humidity indicator card.

Humidity indicator plugs are designed for mounting on reusable or long-term storage containers, in flexible barrier material, in moisture-sensitive electronic or optical equipment, or in any other humidity-controlled enclosure.

They readily detect changes in the relative humidity of the space being monitored by one of two means: Reversible Color-Change and Maximum Humidity Indicator.

How do humidity indicator plugs work?

Humidity indicator plugs have an indicator that resides on the outside of the enclosure, while the rear of the plug is open and exposed to the internal environment of the enclosure.  This allows the indicator card on the plug to react to the internal humidity level, which can be visually inspected on the indicator on the outside of the enclosure.

Benefits Of Using Humidity Indicator Plugs

As receptacles for humidity indicator cards, humidity indicator plugs provide an easy and convenient way of utilizing humidity indicator cards to monitor the internal environments of sealed containers and enclosures without opening the environment.

Industry Applications

Indicator plugs are beneficial for many industries, but are specifically used by those that require storing or shipping in sealed containers that cannot be seen from the outside, or would be compromised if opened.

Custom Engineering Service

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FAQs

Yes. AGM’s Engineering Department has designed hundreds of modified and custom versions for previous customers.

Yes, you can mount a humidity indicator plug in your bag but you will need the mounting nut version to do this.

All of our humidity indicator plug designs will withstand 10 psig in either direction while our TA284 series is guaranteed to 500 psig outward for high-pressure applications.

Most units are rated to 10 psig in the pressure relief direction. This means the higher pressure is behind the window trying to push the window out of the container. The few vacuum direction tests we have run have shown that the TA356 series at least will also hold 10 psig in the vacuum relief direction.

Both the flange and the mounting nut are 1-3/8” hex shapes. So any suitable hand tool that is capable of engaging a 1-3/8” hex will work. We recommend tightening the mounting nut to 30-40 in-lbs.

We recommend 30-40 in-lbs for all humidity indicators we offer that are made of metal except for the TA28X series, which utilize an NPT thread form. For the TA28X series, a higher torque might be required. For the TA380 series (made of SAN plastic), we recommend 5-8 in-lbs, or just finger tight.

This thread is misleading because it actually has a maximum major diameter of 1.027”. Therefore, the recommended mounting hole diameter is 1.050″ (26.7 mm). This thread 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.

Find What You're Looking For

It’s a lot, we know. If you’re looking for something specific or aren’t sure what you need, try searching through all products or give us a shout and we’ll help!