Most devices which have electrical coupling and induction tend to produce electromagnetic interface. As a general rule, such devices should adopt measures to control such an occurrence. The best way to achieve this expectation is by using an EMI seal. There are quite a few aspects that one should take note to guarantee the effectiveness of such gaskets. This article provides the essentials for purchasing EMI seals to ponder on.
Confirm whether it can withstand heat. Quite a few applications that lead to electromagnetic interference produce heat. Therefore, they need a gasket that can withstand such temperatures and work perfectly well as well. Make sure that you are familiar with the amount of heat that the device can produce before you decide to buy the seal.
Factor in the potential to accommodate pressure. Applications that require pressure or form pressure need a seal that can withstand it. As the applied pressure increases, the variety of materials that can accommodate it narrows. The supplier should advise you about the maximum pressure that a particular seal can withstand before you decide on one. You should also beware of the maximum force exerted by your device to choose the right material.
Consider at which stage of manufacture you would consider making of the gasket. If you want a custom-made gasket, you have to consider it at its design stage. Trying to fit a seal on a flange that does not match with its design can make the whole device unreliable. While choosing the model, ensure that there is enough land that can offer different mounting options. Some of the mounting methods that one can select include slot, clip-on, pressure sensitive adhesive and channel mounting.
Ensure that the gasket can protect dust and moisture. Most application that produces EMI has exposure to dust and moisture. Therefore, one should use relevant designs and materials that can protect the device from these elements. One can use a rubber sealing, conductive elastomer or the conductive fabric. All of these types provide a tight seal that cannot allow entry of dust or moisture.
Consider compatibility. Compatibility depends on the galvanization corrosion of the respective material. Therefore, you should look for metals that have similar galvanization scale. For instance, you can rely on a coated nickel to enclose a silicone elastomer in a graphite coat. The galvanization process results from the presence of salt spray. It can significantly break down the conductive joints.
Confirm the amount of frequency that you will shield. Applications in aerospace and military might produce a lot of magnetic waves. Therefore, you have to look for a shield that can prevent the magnetic waves depending on their frequency. The best type of buffers to include the copper fingers or the knitted wire mesh which release the current created within the shields. If the rates are quite low, you have to look for solid protection other than the open one.
Acquaint with the maintenance process. Ensure that the gasket that you decide on has a mechanism to open and close it when you want to do any maintenance. Make sure that you clean it periodically and replace it when it has worn out completely. You should also use a compression stop or collar to avoid breaking when the gasket stays for too long without maintenance.
Confirm whether it can withstand heat. Quite a few applications that lead to electromagnetic interference produce heat. Therefore, they need a gasket that can withstand such temperatures and work perfectly well as well. Make sure that you are familiar with the amount of heat that the device can produce before you decide to buy the seal.
Factor in the potential to accommodate pressure. Applications that require pressure or form pressure need a seal that can withstand it. As the applied pressure increases, the variety of materials that can accommodate it narrows. The supplier should advise you about the maximum pressure that a particular seal can withstand before you decide on one. You should also beware of the maximum force exerted by your device to choose the right material.
Consider at which stage of manufacture you would consider making of the gasket. If you want a custom-made gasket, you have to consider it at its design stage. Trying to fit a seal on a flange that does not match with its design can make the whole device unreliable. While choosing the model, ensure that there is enough land that can offer different mounting options. Some of the mounting methods that one can select include slot, clip-on, pressure sensitive adhesive and channel mounting.
Ensure that the gasket can protect dust and moisture. Most application that produces EMI has exposure to dust and moisture. Therefore, one should use relevant designs and materials that can protect the device from these elements. One can use a rubber sealing, conductive elastomer or the conductive fabric. All of these types provide a tight seal that cannot allow entry of dust or moisture.
Consider compatibility. Compatibility depends on the galvanization corrosion of the respective material. Therefore, you should look for metals that have similar galvanization scale. For instance, you can rely on a coated nickel to enclose a silicone elastomer in a graphite coat. The galvanization process results from the presence of salt spray. It can significantly break down the conductive joints.
Confirm the amount of frequency that you will shield. Applications in aerospace and military might produce a lot of magnetic waves. Therefore, you have to look for a shield that can prevent the magnetic waves depending on their frequency. The best type of buffers to include the copper fingers or the knitted wire mesh which release the current created within the shields. If the rates are quite low, you have to look for solid protection other than the open one.
Acquaint with the maintenance process. Ensure that the gasket that you decide on has a mechanism to open and close it when you want to do any maintenance. Make sure that you clean it periodically and replace it when it has worn out completely. You should also use a compression stop or collar to avoid breaking when the gasket stays for too long without maintenance.
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