An accelerometer is a sensor that senses the dynamic motion of the surface that it is attached to by producing an electrical output which is. The mounting of a vibration sensor (accelerometer) directly impacts on its performance. Incorrect mounting may give readings that relate not only to a change in. Accelerometer Mounting Techniques are described as far as Mounting Surface Preparation, Installation and a variety of methods.
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Stud mounting is recommended if the accelerometer has an integral stud or if it has a tapped hole and is supplied with a removable stud.
Log In Need an Account? Accelerometers should be mounted onto a surface that is free from oil and grease as close as possible to the source of vibration. Magnetic mounting bases offer a convenient and temporary method for attaching to magnetic surfaces.
Stud Mounting The stud mount method is the preferred method of mounting an accelerometer to the test object. The sensor under test should be stud mounted whenever possible for highest accuracy. The ACC weighs 15 gms and can monitor vibration levels up to g’s. The output level will be proportional to the amplitude of the vibrations.
Misalignment of the sensor axis and the measuring directions should be kept as low as possible, particularly if transverse vibration of high magnitude occurs. The accelerometer operating frequency range is determined by a back- to-back calibration method where the accelerometer under test is securely mounted to a reference standard accelerometer. Accuracy of frequency response is one of the most important factors when deciding which mounting technique to use.
The must be no gap under the sensor. Large High-temperature Clip, insulated set of 5. UA Small swivel base set of ACC A is hermetically sealed for harsh environments, has a fixed cable and weighs only 50 grams.
Adhesively mounted accelerometer To avoid damaging a sensor during the removal process, a debonding agent must be applied to the adhesive. Premium Grade Accelerometer These accelerometers are made from premium selected crystals and use low noise circuitry to product a premium, low noise, accelerometer. In this type of accelerometer the piezoelectric crystal produces an electrical charge which is connected directly to the measurement instruments.
It is a stud mount design and accelerometee designed for use on shaker tables, vibration labs and heavy industrial machine tools. Press onto the test object perpendicularly. The frequency range of the accelerometer should fit the expected frequency range. Triaxial Mounting Block for DC and response accelerometers. Types of Accelerometer Mounting.
Magnets with high pull strengths provide the best high-frequency response. Mounting methods for accelerometers Figure 17 compares the typical high frequency performance of some mounting methods as a result of added mass and reduced mounting stiffness. Large Calibration Clip for mounting accelerometers under calibration. A thread-locking mounings may be applied to the threads of the mounting acceleromeer to safeguard against loosening.
An accelerometer is a device that measures the vibration, or acceleration of motion of a structure. The type of adhesive recommended depends on the application. Small High-temperature Clip, insulated set of 5. Flat magnet base Model A27 Figure 8: The supplied removal tool should be used for teardrop accelerometers Figure 5.
A low impedance accelerometer has a charge accelerometer as its front end but has a tiny built-in micro-circuit and FET transistor that converts that charge into a low impedance voltage that can easily interface with standard instrumentation. What is the size and shape of the mountinge to be monitored? Studs come either as an integral part of the accelerometer or as a removable piece of the accelerometer.
Types of Accelerometer Mounting
Proceed to chapter Accelerometer Cabling. Low Frequency Cut-off is the frequency where the output starts to fall off below the stated accuracy.
The surface should be smooth, unpainted, flat and larger than the base of the accelerometer itself. Accelerometer Introduction to Acceleration Measurement. Modelsand provide isolation against ground loops. Case Grounded accelerometers have the low side of the signal connected to their case.
Grounding – There are two types of signal grounding in accelerometers.
How To Mount Accelerometers Correctly
Response degradation in direct proportion to the weight of the accelerometer may occur and for the best results, avoid magnetic mounting to unclean surfaces, non-flat surfaces and surfaces with thick paint. For best performance, particularly accslerometer high frequencies, the accelerometer base and the test object should have clean, flat, smooth, unscratched and burr-free surfaces.
The first type is a “high impedance” charge output accelerometer.