Issue 111
Static and Dynamic Proximity Probe Testing Prevents False Trips; Ensures Machinery Protection

Have you ever scratched a rotating machine shaft during a proximity probe gap installation? Do you utilize an identical - hopefully - dummy probe for loop checks due to the difficulty of removing a reverse mount probe from its housing?

Many customers avoid removing proximity probes from bearings when they are installed in probe sleeves, aka "stingers," where longer probe penetration is required. This leads to shutdown alarm testing workarounds like substitute probes or electrical simulations.

The Modal Shop introduces the Proximity Probe Stinger Holder Model 9100-PPASH for the Portable Vibration Calibrator, making it easy to create static prox probe curves and allow end-to-end loop testing without risking thread damage during removal. Test your entire measurement chain with the actual proximity probes protecting your critical equipment to ensure alerts and alarms are working as expected.

Industry News 

A good, basic introduction to vibration analysis comes from Jonathan Trout in Reliable Plant. In the article  Vibration Analysis Explained , he discusses the trend toward small, portable vibration instrumentation that communicates with smartphones and tablets in real-time. Tools like the Digiducer , a plug-and-play USB accelerometer that can be plugged right into a smartphone or tablet with no special drivers, make it easy to upload vibration data to the cloud. Machine health databases can allow users to compare the vibration profile of their machinery to that of similar machinery identified as "healthy," allowing for optimized machine performance and catching problems before they cause downtime - a truly proactive approach to machine health.

To learn more about digitizing the data from any type of ICP dynamic sensor, take a look at this recent webinar, given by Marco Peres. Marco discusses a simple, pocket-sized, two-channel solution for digitizing data and seamlessly connecting to almost any device, including a phone, computer, or even a single-board computer, such as a Raspberry Pi* or Arduino*. The potential applications are almost endless.

We also liked Kevin Conlin's article for Sensors Expo and Conference 2019, Tips for Reducing Error When Using Eddy Current Measuring Techniques. As a non-contact method for measuring distance, eddy current technology is a great option, but there are a few tips to minimize possible measurement errors, including calibrating for the operating temperature and conditions, avoiding placing multiple sensors close to each other, and paying careful attention to mounting. Cabling errors are also a common source of failure in machinery protection systems relying on eddy current probes. Take a look at this video to see how a Portable Vibration Calibrator can be used to troubleshoot cabling issues.
Is it a Portable Calibrator or a Wobulator?
Why Do I Care?

Many people refer to The Modal Shop's Portable Vibration Calibrator as a "wobulator." Even though they look similar, the wobulator and the PVC are different tools, each with its own advantages. How can you decide which is the best solution for you? Take a look at this comparison

Have more questions? Give our team a call, and we'll be happy to help you find the right solution for your testing and calibration needs.

How About a Training Session?

Did you know The Modal Shop offers training on how to test vibration sensors in your plant? Sometimes we even bring pizza. Contact us to learn more!


Michael R. Scott
Category II Vibration Analyst
The Modal Shop, Inc.
An MTS Systems Corporation

*The Modal Shop is not associated with Raspberry Pi or Arduino