Looking to get started with the USB Digital Accelerometer from Digiducer? Working with the Model 333D01 is simple. There is an application for each major platform. The Digiducer’s plug-and-play capability makes setup effortless. Choose any one of the major platforms – Windows, iOS, Android, MacOS – download and install a software package, attach the adaptor (applicable for mobile devices only) and plug in the Digiducer. Your vibration measurement system is complete. Mount the sensor to the test subject of your choice and run the application. In the case that additional help is needed to get started, visit our getting started section.
For tips on how to mount your accelerometer, see our Mounting Guide.
A variety of software packages are available to choose from. Many of the software options have offer a free trial or are totally free. Every popular platform has software that will allow you to get started easily.
Take a stroll through Digi-Land and let us know what you think.
In the past weeks, we’ve discussed stud mounting and adhesive mounting. Now, let’s turn our attention to magnetic mounting. These are the three different types of techniques common to mounting accelerometers. Each of these methods have tradeoffs in their usability. Surface preparation is slightly different in each case, and the type of surface varies. No one mounting practice is best suited for every situation.
Magnetic mounting provides a convenient means for quick mounting and is commonly used for machinery condition monitoring, predictive maintenance, spot checks, and vibration trending applications. When doing any type of magnetic mounting, the user should always exercise caution when placing the magnet against the surface, specifically when the sensor is already attached to the magnet. Magnetically mounting of an accelerometer has the potential to generate very high acceleration (g) levels if the mounting base is allowed to slap or slam in the machine structure. To prevent damage, exercise extreme caution and install the assembly gently by rocking it into place. If shock is expected to be a particular concern, use a sensor with built-in shock protection.
See our Accelerometer Mounting Guide for more information.
Previously, we looked at stud mounting, the time-consuming but best result yielding of the three types of mounting methods.
Adhesive mounting is generally used for temporary installation or when the surface cannot be adequately prepared for stud mounting. Adhesives like hot glue and wax work well for temporary mounts; two-part epoxies and quick bonding gels (super glue) provide a more permanent mount. Adhesively mounted sensors often exhibit a reduction in high-frequency range. Generally, smooth surfaces and stiff adhesives provide the best frequency response.
In the case that you decide that adhesive mounting is the best suited technique for your application caution should be exercised regarding the amount of the component used. During the initial mounting process be aware that excessive amounts of adhesive can make the sensor removal difficult. This can cause damage to the sensor, purely cosmetic in moderate cases, but can prove to be costly in more extreme cases. This can also cause a considerable amount of damage to the unit that the sensor is mounted to as well. Rarely should you ever bond directly to the accelerometer base. If you have to bond directly to the base, one trick is fill the mounting stud hole with mounting petrowax. Most often you should use a disposable mounting base which has: rings milled in the base for good adhesion, a threaded hole to securely connect to the transducer with a mounting stud, and an anodized or hard-coated surface which electrically isolates the accelerometer to avoid ground loops. However, too little adhesive will not create a cohesive joint for the sensor to stay mounted. Also, adhesive that may invade the tapped mounting hole in the base of the sensor will compromise future ability to stud-mount the unit. Thickness of the adhesive can also limit the frequency response of the accelerometer.
When choosing an adhesive is advised that it is first tested. When testing a adhesive it is best to do it on a hidden area of the structure, especially when concerned about the structure’s surface finish.
For a faster method of mounting the sensor, try magnetic mounting.
Need further explanation about a certain mounting technique? View our Mounting Guide.
There are three different types of mounting techniques for accelerometers: Stud, Adhesive and Magnetic. No matter which method is chosen, surface preparation is a key component to attaining quality results. See our blog on surface preparation for tips on the proper way to prepare a surface for mounting an accelerometer.
Stud mounting is recommended for permanent, secure installations. This method requires the surface to be flat and preferably clear of nicks, divots, scratches, and any other type of deformation. A precision-machined mounting surface is recommended. It is also recommended to wipe the surface clean and spread on a thin application of a light lubricant to improve transmissibility.
If machining the surface is not possible, or for a semi-permanent mounting, consider adhesive mounting as a possible alternative.
Need help choosing a mounting technique? View our Mounting Guide.
Collecting correct vibration data is the basis of vibrational analysis. However, during this process one of the most fundamental concepts can often be overlooked. It’s common knowledge that properly mounting the accelerometer leads to more reliable data, but where does it start? Surface preparation can easily be disregarded by the inexperienced engineer, but it is literally the foundation of the mounting process. If the surface is not prepared properly, the effects on the data can be substantial. No matter the method of mounting, the outcome will depend on the type of surface and how it is prepared.
The preparing of the surface is as significant to the mounting process as the method of mounting the accelerometer itself. The surface will directly affect the frequency response at any frequency level. Special attention should always be taken to ensure a flush mating between the sensor and surface. Nicks, divots, scratches, or other deformations of the mounting surface, or the sensor surface, will affect the frequency response produced by the sensor. It is advised that whenever possible a flat, precision-machined surface is used. A thin layer of light lubricant compound is also recommended as it will improve transmissibility, filling voids with nearly incompressible fluid and thereby increasing the stiffness of the joint. This is especially relevant when measuring at frequencies above 2 kHz, at which any changes in resonance have a significant effect on measurements.
Need help choosing a mounting technique? View our Mounting Guide.