![]() ![]() As pressure propagates through the Bourdon tube within the Series DA/DS, the tube uncurls, pivoting a mechanical linkage and activating a switch at a point which is set by an end user. Bourdon Tube Pressure Switches, Series DA/DSīourdon Tube Pressure Switches, Series DA/DS, utilize this type of sensor to detect pressure. When media is forced through this tube, the resulting pressure causes the tube to straighten. A Bourdon tube-often made of metal-appears as a curved or curled tube capped at one end. Another type of sensing element is a Bourdon tube. Not all pressure-sensing devices utilize diaphragms, however. Deflection of the diaphragm pushes a spring-loaded magnet, which in turn rotates a helix that pivots the indicating pointer. ![]() The diaphragm within the Magnehelic® gage works with the key magnet and helix assembly unique to its design. Magnehelic® Differential Pressure Gage Cutaway Choosing the appropriate diaphragm material for each application will allow your gage to handle its job appropriately. This is beneficial for applications using media such as propane, natural gas, or any media which is known to react adversely with the silicone rubber that makes up the standard option diaphragm. For example, several Dwyer products such as the Magnehelic® gage, Photohelic® gage, and Capsuhelic® gage can be created with Buna-N diaphragms by ordering with option -BUNA. For many products Dwyer offers, a diaphragm material can be specified to suit an end user’s needs. In some applications, this process media may not be suitable to diaphragms of certain material. Without the use of an inline diaphragm seal or barrier, process media typically comes in direct contact with the diaphragm. When used in systems within published specifications, however, a sensitive diaphragm allows for very precise pressure indication. In some cases, simply rotating the diaphragm out of its normal, vertical mounting position can cause the diaphragm to deflect due to the force of gravity, changing the gage’s zero reference. Care must be taken in order to prevent over-pressurizing the gage, as this runs the risk of stretching the diaphragm out of its normal shape and altering overall gage calibration (or even tearing the diaphragm). Rubber silicone diaphragms, used in the Magnehelic® gage, appear much like a slice of a deflated balloon. Magnehelic® Differential Pressure Gages, Series 2000Ī diaphragm is a common sensing element, found within the Dwyer Magnehelic® Differential Pressure Gage, Series 2000. Today we’ll be discussing the functions of diaphragms and Bourdon tubes. By understanding the components that make these products function and carefully comparing their specifications with your application requirements, you ensure the correct instrumentation is being used for your application. There are several types of sensing elements used inside pressure measurement devices. As discussed in previous articles and videos, pressure is the amount of force acting on a specific area and is equal to the force divided by the area. ![]()
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