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High Temperature Speed Sensors provide the ability and versatility to sense application speeds in environments with extremely high temperatures. The High Temperature VR sensor can be placed in applications with temperatures ranging from -450F to +1000F. In addition, most high temperature speed sensors are specially constructed for excellent shock and vibration resistance, as well as an ability to withstand temperature thermocycling.
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Industry Versatility
The high temperature speed sensor is hermetically sealed, which means that it can withstand such things as hydraulic and engine oils, which is often necessary for the automotive, rail, aerospace and agricultural industries. The sensor is also able to withstand chemical exposure and has excellent corrosion resistance as a result of its stainless steel body construction.
Industry demands place a lot of pressure on high temperature speed sensors in monitoring engine speeds, transmissions, and braking applications. The high temperature speed sensor is also used in flowmetering applications where high temperatures are present. This sensor is actually capable of performing in temperatures of up to +850 degrees F, +1000 degrees F intermittently. Talk about performing under duress. You can see why this sensor would need to be tough as nails and as durable as the day is long.
Material Selection
Every material used in a high temperature speed sensor needs to be specially selected for use in the hostile, high temperature environments in which it will be used. Special potting material encapsulates the sensor body, and high temperature cement is used to encase the internals as well as any interconnecting lead wires. In addition, a custom high temperature ceramic insulated magnet wire must be used for the sensor winding, versus the standard copper magnet wire that is seen in most standard Variable Reluctance Sensors.
Application Awareness
The bottom line is that when selecting a speed sensor for your application, it pays to be very aware of the temperature present in the application. There are a wide variety of applications where a lower temperature device is appropriate, that does not require the special construction and materials of the high temperature speed sensor. However, in applications where the temperature range is extreme, devices other than a high temperature speed sensor will quickly fail due to excessive heat.
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