U.S. Ground
Parcel Shipments
See Shipping Policy

Enclosure Pressure, Humidity & Condensation

Enclosure pressure, particularly in electrical enclosures, plays a significant role in maintaining the integrity and functionality of electrical equipment. Applying positive internal pressure within the enclosure, often using inert gas or simply clean, dry air, helps in preventing the ingress of flammable gases, dust, and moisture, which are potential hazards in various industrial environments. This pressurization is essential in both indoor and outdoor enclosures, especially where the risk of explosive atmospheres or high ambient humidity levels exists.

Maintaining a positive pressure inside an enclosure means that the internal pressure is slightly higher than the surrounding atmosphere. This prevents moist air from entering the enclosure and creating conditions conducive to condensation. Condensation within an enclosure can lead to water droplets forming on electrical components, raising the risk of short circuits and corrosion. To combat this, methods such as applying corrosion inhibitor sprays and installing air conditioners or heaters are used. Heaters help in regulating the enclosure's internal temperatures, reducing the relative humidity inside and preventing condensation.

Found 32 items
Filters
Found 32 items
Manufacturer
Hoffman (30)
Rittal (1)
Schneider Electric (1)
Component
Air Conditioner Accessories (1)
Breather Drain (4)
Dehumidifier (1)
Drain Vent (1)
Electronic Hygrotherm (1)
Inlet Ring For Motor Impeller (1)
Mechanical Hygrostat (1)
Pressure Compensation (2)
Pressure Compensation Plug (1)
Purge And Pressurization (15)
Sub Component
Condensate Discharge (1)
Continuous Flow Purge And Pressurization System (2)
Continuous Flow Service Kit (1)
Hazardous Location Breather Drain (4)
Large-Volume ATEX Purge System Type Y Z And Ex [Pz] (2)
Large-Volume Type Y And Z Purging/Pressurization System (3)
Leak Compensation Purge And Pressurization System (4)
Leakage Compensation Service Ki (1)
Small-Volume Purging/Pressurization System (2)
(Pressure-Humidity Component) Operation Type
Continuous Flow (3)
Leak Compensation (5)
Purging Max Enclosure Volume
10 Cubic Feet (1)
2 Cubic Feet (1)
90 Cubic Feet (2)
Purging Hazardous Classification
ATEX Directive 94-9-EC Zone 1 (4)
ATEX Directive 94-9-EC Zone 2 (4)
Class 1 Div 1 Group A (4)
Class 1 Div 1 Group B (4)
Class 1 Div 1 Group C (4)
Class 1 Div 1 Group D (4)
Class 1 Div 2 Group A (4)
Class 1 Div 2 Group B (4)
Class 1 Div 2 Group C (4)
Class 1 Div 2 Group D (4)
(Pressure-Humidity Component) Composition
ABS (1)
Plastic (4)
Stainless Steel (18)
Line
Thalassa (1)
(Pressure-Humidity Component) NEMA Rating
NEMA Type 4 (4)
NEMA Type 4X (4)
(Pressure-Humidity Component) Mount Type
Exterior Mount (6)
Flush Mount (4)
Normally In Stock
Hoffman AVDR4NM Non-Metallic Vent Drain
Free U.S Ground shipping
$91.61
$76.34
Normally In Stock
Hoffman H2OMITTER H2Omit Thermoelectric Dehumidifier
Free U.S Ground shipping
$1058.42
$882.02
Normally In Stock
Hoffman AVDR4SS4 Stainless Steel Vent Drain
Free U.S Ground shipping
$186.41
$155.34
Normally In Stock
Hoffman ATEMHUM 120 VAC Electronic Hygrotherm
Free U.S Ground shipping
$667.90
$556.58
Normally In Stock
Hoffman AMHUM 250 VAC Mechanical Hygrostat
Free U.S Ground shipping
$576.12
$480.10
Normally In Stock
Hoffman A1001YZUMC2 Small-Volume Purging/Pressurization System10 CF
Free U.S Ground shipping
$2784.48
$2320.40
Normally In Stock
Hoffman APCDABS Non-Metallic Pressure Compensation
Free U.S Ground shipping
$109.19
$90.99
Normally In Stock
Hoffman EXEBDM25SS6 Hazardous Locations Breather Drain
Free U.S Ground shipping
$154.31
$128.59
Normally In Stock
Hoffman APCDSS6 Stainless Steel Pressure Compensation
Free U.S Ground shipping
$543.61
$453.01
Normally In Stock
Hoffman A1001YZUMC1 Small-Volume Purging/Pressurization System 2 CF
Free U.S Ground shipping
$2784.48
$2320.40
Normally In Stock
Hoffman EXDBDM25SS6 Hazardous Locations Breather Drain
Free U.S Ground shipping
$360.85
$300.71
Normally In Stock
Hoffman PLCF1YZ Purge and Pressurization System Leak Compensation
Free U.S Ground shipping
$4673.21
$3894.34
Normally In Stock
Hoffman PLCB1YZ Purge and Pressurization System Leak Compensation
Free U.S Ground shipping
$4673.21
$3894.34
Normally In Stock
Hoffman PCFF1YZ Purge and Pressurization Continuous Flow
Free U.S Ground shipping
$3257.28
$2714.40
Normally In Stock
Hoffman PCFB1YZ Purge and Pressurization Continuous Flow
Free U.S Ground shipping
$3257.28
$2714.40
Normally In Stock
Hoffman PLCS1X1 Purge and Pressurization System Leak Compensation
Free U.S Ground shipping
$16519.99
$13766.66
Normally In Stock
Hoffman PLCS1X2 Purge and Pressurization System Leak Compensation
Free U.S Ground shipping
$17181.64
$14318.03
Normally In Stock
Hoffman PLCSKIT Purge and Pressurization System Leakage Compensation Service Ki
Free U.S Ground shipping
$348.43
$290.36
Normally In Stock
Hoffman PCFSKIT Purge and Pressurization System Continuous Flow Service Kit
Free U.S Ground shipping
$348.43
$290.36
Normally In Stock
Rittal 2459000 Condensate discharge
Free U.S Ground shipping
$64.64
$53.87
Normally In Stock
Hoffman PCP ARIA Pressure Compensation Plug, Smooth Matte, Black, Polymide, PCP
Free U.S Ground shipping
$43.08
$35.90
Normally In Stock
Hoffman A3003YZHM Large-Volume Type Y and Z Purging/Pressurization System 90 CF
Free U.S Ground shipping
$5227.99
$4356.66
Normally In Stock
Hoffman A3003YZVM Large-Volume Type Y and Z Purging/Pressurization System 90 CF
Free U.S Ground shipping
$5435.89
$4529.91
Normally In Stock
Hoffman EXEBDM20SS6 Hazardous Locations Breather Drain
Free U.S Ground shipping
$109.36
$91.13
Normally In Stock
Hoffman 101072124SP Inlet Ring for Motor Impeller 10.50x2.00x10.75
Free U.S Ground shipping
$57.47
$47.89
Normally In Stock
Schneider Electric NSYVEA9 - Water Drain Plug
Free U.S Ground shipping
$4.40
$3.67
Normally In Stock
Hoffman RDV - ARIA Round Vent, Smooth Matte, Light Gray, Polymide, RDV
Free U.S Ground shipping
$16.27
$13.56
Normally In Stock
Hoffman EXDBDM20SS6 Hazardous Locations Breather Drain
Free U.S Ground shipping
$245.44
$204.53

More Information about Enclosure Pressure, Humidity & Condensation Protection

In environments where the temperature and humidity fluctuate, it's essential to continuously monitor the air inside the enclosure. Devices that automatically trigger the purging process or control the flow of protective gas can be installed. This ensures that the air within the enclosure remains dry and at a constant flow, effectively preventing condensation.

The concept of purging and pressurization in enclosures is typically regulated by standards such as the ATEX Directive or IEC standards, ensuring safety in hazardous environments. These standards dictate the level of pressurization required and the types of gases or air that can be used for maintaining a safe environment within the enclosure.

Another aspect of managing humidity and condensation is ensuring proper ventilation while maintaining the required pressure and moisture levels. This could involve the use of ventilation systems that allow air to circulate within the enclosure while keeping moisture and hazardous gases out.

FAQs

How does air temperature affect a pressurized enclosure?

Air temperature can significantly affect a pressurized enclosure in several ways. Firstly, an increase in temperature typically causes the air inside the enclosure to expand, leading to an increase in pressure if the volume of the enclosure is fixed. Conversely, a decrease in temperature can cause the air to contract, resulting in a decrease in pressure within the enclosure, assuming no air is added or removed.

Purge System Basics 

3 common reasons to use purge systems 

They allow electrical enclosures to be installed in hazardous areas without the need for explosion proof enclosures.

They recycle the air inside of an enclosure, reducing the internal temperature.

They help reduce the effects of corrosion on components housed within the enclosure.

How does a purge system work?

Purge systems use incoming air from a supply line, solenoid valves, pressure gauges and pumps, to constantly maintain a positive pressure inside an enclosure. This prevents any flammable gases from entering the enclosure potentially causing an ignition event to occur. By maintaining a positive pressure within the enclosure, moisture and corrosive gases are also prevented from entering the enclosure and damaging components. Most purge systems will ensure that the air inside the enclosure is recycled a certain amount of times within a given time period. This air recycle function assists in maintaining a cooler temperature within the enclosure.