Product Overview
The 4-spot humidity indicator operates on the same principle as standard humidity indicator cards, with a threaded design for direct mounting onto the outer wall of sealed containers. Constructed from black aluminum alloy, it features a large, transparent viewing window for clear, direct reading of the relative humidity level inside sealed enclosures, without opening the container.
This 4-point precision humidity indicator plug provides stable, reversible humidity indication, compliant with military and aerospace standards, suitable for precision instruments, military equipment, aviation, electronics, and industrial sealing humidity monitoring.
Product Specifications (Parameter Table)
All dimensions & performance data in accordance with engineering drawing & product testing standards
|
Item |
Specification |
|
Product Name |
4-Spot Black Aluminum Humidity Indicator / 4-Point Humidity Indicator Plug |
|
Humidity Indication Range |
20%-30%-40%-50% RH (Customizable) |
|
Surface Treatment |
Black Anodized / Zinc Plate (Black Finish) |
|
Thread Size |
3/4 - 14 Straight Pipe |
|
Mounting Hole Diameter |
1.05 in (26.7 mm) |
|
Window Diameter |
0.67 in (17.2 mm) |
|
Maximum Operating Pressure |
10 psi |
|
Recommended Installation Torque |
30 – 40 in.-lbs. (3.4 – 4.5 N·m) |
|
Maximum Mounting Wall Thickness |
0.23 in (6 mm) |
|
Main Body Material |
Black Aluminum Alloy / Brass QQ-B-626 |
|
Internal O-Ring Material |
IAW MIL-PRF-6855 |
|
External Gasket Material |
IAW MIL-PRF-6855 |
|
Compliance Standard |
MIL-STD-2073-ID Method 50 |
|
Overall Hex Width |
1.38 in (35 mm) |
|
Total Length |
1.59 in (40 mm) |
|
Maximum Projection |
0.19 in (4.7 mm) |
|
Accuracy |
±5% RH at 24°C (Room Temperature) |
Product Description
Purpose
The 4-spot humidity indicator is designed to display the relative humidity level inside sealed containers, enclosures, and equipment without opening the sealed space. It delivers real-time, visual humidity status for moisture-sensitive environments, ensuring long-term monitoring and protection of internal components
Operating Features
The indicator reading is reversible and fluctuates with the actual relative humidity level inside the enclosure.
High precision: Reading accuracy within ±5% RH at 24°C standard environment.
Sealed, anti-leakage structure, resistant to high temperature, shock and vibration.
4-point (20/30/40/50%RH) scale for precise, multi-level humidity judgment.
Storage & Handling
Keep the humidity indicator in its original packaging until ready for installation.
The internal indicator card consists of water-soluble materials. Do not expose the indicator directly to water, steam, or ammonia gas, as these will cause permanent damage to the indication function.
Store in a cool, dry, low-humidity environment to preserve service life.
Configuration & Compatibility
Available in multiple sizes and mounting configurations; humidity ranges from 5% RH to 95% RH are customizable.
Compatible with rigid equipment housings, electrical enclosures, and flexible moisture-proof bags, barrier bags, and fiber packaging.
Fully compatible with applications requiring MIL-STD-2073-1 Method 50 and AS26860 aerospace packaging standards.
Compact threaded plug design delivers excellent sealing, heat resistance, and mechanical durability for harsh transportation and operating environments.
Applications
Our 4-spot black aluminum humidity indicator is widely used in precision and industrial fields that require strict humidity control:
- Military Equipment & Weapon Systems
- Night Vision Devices & Radar Systems
- Aerospace & Aviation Components
- Hydraulic & Pneumatic Systems
- Precision Electronic Instruments & Circuitry
- Marine & Shipboard Moisture Monitoring
- Industrial Metal Equipment & Sealed Components
- Transportation & Logistics Sealed Packaging
Packaging, Shipping & Certification
Packaging & Transportation
The product is packed in thick, shock-resistant cartons with internal buffer protection to avoid damage during transit. Standard export packaging ensures safe, stable transportation by sea, air, or express delivery.
Quality Certification & Compliance
Products pass strict factory inspection and third-party testing, with complete certification including ISO quality management system, IAF, and industry-related compliance reports. All indicators are manufactured under standardized quality control to ensure consistent performance and long service life.
Key Product Advantages (For Google Website Display)
4-Point Precision Indication
20/30/40/50% RH clear color-changing display, easy to read at a glance.
Black Aluminum Alloy Body
Rugged, corrosion-resistant, lightweight, suitable for harsh environments.
Military Standard Compliance
Meets MIL-STD-2073-ID Method 50 for military & aerospace use.
Reversible & Accurate
Stable reading within ±5% RH, fully reversible with ambient humidity.
Easy Installation
Standard 3/4-14 straight pipe thread, universal mounting for most sealed enclosures.
Sealed & Durable
Anti-leakage, high temperature, shock & vibration resistant structure.
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