Page 114 - EEC_HeavyDuty
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I/RFI
System EMI/RFI Performance
Long-term Performance Metals Compatibility
Long-term performance should be a major factor in your enclo- To avoid galvanic action between metals that contact each other,
sure selection. An enclosure that develops leaks over time may refer to the chart below. Each group overlaps, making it possible
become apparent only after other system problems develop from to use materials from adjacent groups safely.
stray signals. Investing in an enclosure that has been designed for Group 1 (Metal Groupings)
long-term performance will result in fewer problems in the Gold4Platinum4Gold/Platinum Alloys4Rhodium4Graphite
future. Three significant factors affect the long-term performance Palladium4Silver4Silver Alloys4Titanium
of a shielded enclosure: Group 2 (Metal Groupings)
Rhodium4Graphite4Palladium4Silver4Silver Alloys
4 Enclosure Design – The basic design of the sheet metal Titanium4Nickel4Monel4Cobalt4Nickel and Cobalt Alloys
components should contribute to shielding performance. Nickel Copper Alloys4AISI 300 Series Steels4A286 Steel
Equipto Electronics’ Heavy Duty enclosures serve as the Group 3 (Metal Groupings)
basis for our shielded enclosures and provide a significant Titanium4Nickel4Monel4Cobalt4Nickel and Cobalt Alloys
level of shielding, even without gaskets, due to the double Nickel Copper Alloys4Copper4Bronze4Brass4Copper
ledge, double plane construction of the frame, flush side Alloys4Beryllium Copper4Silver Solder4Commercial Yellow
panels and door design. The inherent design characteristics of Brass and Bronze4Leaded Brass and Bronze4Naval Brass
the Heavy Duty frame allow it to be adapted easily to addi- 400 Series Stainless Steel4Chromium Plate4Tungsten
tional gasket and door configurations and its strength makes Molybdenum
it adaptable to other dynamic performance requirements. Group 4 (Metal Groupings)
Leaded Brass and Bronze4Naval Brass4Steels AISI, 431, 440,
4 Materials Compatibility – Because shielded enclosures must 410, 416, 420, AM 355, PH hardened4Chromium Plate
be electrically conductive to operate effectively, using dis- Tungsten4Molybdenum4Tin-Indium4Tin Lead Solder4Lead
Aluminum 2000/7000 Series4Alloy and Carbon Steel
similar materials can cause corrosion and loss of shielding Group 5 (Metal Groupings)
Chromium Plate4Tungsten4Molybdenum4Steels AISI, 410,
performance. The corrosion is an electro-chemical reaction 416, 420, Alloy and Carbon4Tin-Indium4Tin Lead Solder
Lead4Aluminum4All Aluminum Alloys4Cadmium4Zinc
between the two dissimilar metals which significantly Galvanized Steel4Beryllium4Zinc Base Castings
Group 6 (Metal Groupings)
impairs the electrical conductivity between the two metals Magnesium4Tin
and is a cause of leaks that develop over a period of time. In the Standard Shielding method,
Panels and Doors fit into the
The easiest to way to control galvanic corrosion is to specify
recessed ledges of the frame with
enclosures that use materials that are as galvanically beryllium copper spring-finger
gasketing, assuring
similar as possible. Materials used in Equipto high-shielding effectiveness.
Electronics shielded enclosures have been carefully speci- In the Double Shielding or combina-
tion of EMI/RFI shield and dust and
fied to provide the best possible compatibility and moisture gasket, the dust and moisture
gasketing is easily added at the panel
durability. Plated frames and pan- els are not used, due seams and door for protection in the
harsh environments of factory and
to susceptibility to damage in the manu- facturing field applications.
or the system building process as well as compati-bility
issues.
4 Gasket Durability – In addition to frame design and frame
material compatibility gasket materials must be carefully
specified. Since the gasket is a critical component in assur-
ing electrical conductivity between removable panels and
doors, its profile is also critical.
8 Materials – are they galvanically compatible? The
gasket/enclosure electrical conductivity must be
maintained in order for the enclosure to provide sus-
tained acceptable attenuation. Equipto
Electronics has taken special care to utilize mate-
rials that are gal vanically compatible and
specified for long-term use. While all dissimilar
materials will have some corrosive effect on each
other, materials used in our EMI/RFI cabinets pro-
A114 Equipto Electronics Corp.4Aurora, IL4800.204.72254630.897.46914Fax 630.897.5314
System EMI/RFI Performance
Long-term Performance Metals Compatibility
Long-term performance should be a major factor in your enclo- To avoid galvanic action between metals that contact each other,
sure selection. An enclosure that develops leaks over time may refer to the chart below. Each group overlaps, making it possible
become apparent only after other system problems develop from to use materials from adjacent groups safely.
stray signals. Investing in an enclosure that has been designed for Group 1 (Metal Groupings)
long-term performance will result in fewer problems in the Gold4Platinum4Gold/Platinum Alloys4Rhodium4Graphite
future. Three significant factors affect the long-term performance Palladium4Silver4Silver Alloys4Titanium
of a shielded enclosure: Group 2 (Metal Groupings)
Rhodium4Graphite4Palladium4Silver4Silver Alloys
4 Enclosure Design – The basic design of the sheet metal Titanium4Nickel4Monel4Cobalt4Nickel and Cobalt Alloys
components should contribute to shielding performance. Nickel Copper Alloys4AISI 300 Series Steels4A286 Steel
Equipto Electronics’ Heavy Duty enclosures serve as the Group 3 (Metal Groupings)
basis for our shielded enclosures and provide a significant Titanium4Nickel4Monel4Cobalt4Nickel and Cobalt Alloys
level of shielding, even without gaskets, due to the double Nickel Copper Alloys4Copper4Bronze4Brass4Copper
ledge, double plane construction of the frame, flush side Alloys4Beryllium Copper4Silver Solder4Commercial Yellow
panels and door design. The inherent design characteristics of Brass and Bronze4Leaded Brass and Bronze4Naval Brass
the Heavy Duty frame allow it to be adapted easily to addi- 400 Series Stainless Steel4Chromium Plate4Tungsten
tional gasket and door configurations and its strength makes Molybdenum
it adaptable to other dynamic performance requirements. Group 4 (Metal Groupings)
Leaded Brass and Bronze4Naval Brass4Steels AISI, 431, 440,
4 Materials Compatibility – Because shielded enclosures must 410, 416, 420, AM 355, PH hardened4Chromium Plate
be electrically conductive to operate effectively, using dis- Tungsten4Molybdenum4Tin-Indium4Tin Lead Solder4Lead
Aluminum 2000/7000 Series4Alloy and Carbon Steel
similar materials can cause corrosion and loss of shielding Group 5 (Metal Groupings)
Chromium Plate4Tungsten4Molybdenum4Steels AISI, 410,
performance. The corrosion is an electro-chemical reaction 416, 420, Alloy and Carbon4Tin-Indium4Tin Lead Solder
Lead4Aluminum4All Aluminum Alloys4Cadmium4Zinc
between the two dissimilar metals which significantly Galvanized Steel4Beryllium4Zinc Base Castings
Group 6 (Metal Groupings)
impairs the electrical conductivity between the two metals Magnesium4Tin
and is a cause of leaks that develop over a period of time. In the Standard Shielding method,
Panels and Doors fit into the
The easiest to way to control galvanic corrosion is to specify
recessed ledges of the frame with
enclosures that use materials that are as galvanically beryllium copper spring-finger
gasketing, assuring
similar as possible. Materials used in Equipto high-shielding effectiveness.
Electronics shielded enclosures have been carefully speci- In the Double Shielding or combina-
tion of EMI/RFI shield and dust and
fied to provide the best possible compatibility and moisture gasket, the dust and moisture
gasketing is easily added at the panel
durability. Plated frames and pan- els are not used, due seams and door for protection in the
harsh environments of factory and
to susceptibility to damage in the manu- facturing field applications.
or the system building process as well as compati-bility
issues.
4 Gasket Durability – In addition to frame design and frame
material compatibility gasket materials must be carefully
specified. Since the gasket is a critical component in assur-
ing electrical conductivity between removable panels and
doors, its profile is also critical.
8 Materials – are they galvanically compatible? The
gasket/enclosure electrical conductivity must be
maintained in order for the enclosure to provide sus-
tained acceptable attenuation. Equipto
Electronics has taken special care to utilize mate-
rials that are gal vanically compatible and
specified for long-term use. While all dissimilar
materials will have some corrosive effect on each
other, materials used in our EMI/RFI cabinets pro-
A114 Equipto Electronics Corp.4Aurora, IL4800.204.72254630.897.46914Fax 630.897.5314
