quirements, Sensonics devel- oped its velocity vibration sen- sor, the VEL/GLF. The VEL/GLF is an electro- dynamic sensor which Sen- sonics believes is the ideal option for measuring vibra- tion on slow-speed rotating machinery. It offers im- proved performance over piezoelectric devices by combining high measure- ment sensitivity with a fre- quency response down to 0.5Hz, making it ideally suited to measuring velocity vibra- tion on equipment with speeds below 300rpm. The sensor offers a standard
IEPE-type interface to enable easy integration with existing plant protec- tion and monitoring equipment. Furthermore, the VEL/GLF provides advan- tages over traditional piezoelectric velocity vibration sensors which are susceptible to many forms of interference in low-frequency applications that can result in spurious readings and alarms. Typical causes of these unwanted readings and alarms include base strain effects due to temperature changes amplified through the internal signal processing as well as high-frequency and high-g vibration events caused by auxiliary machine items resulting in trans- ducer saturation. Thanks to its robust design, the VEL/GLF combats these effects, of- fering good noise immunity due to the low impedance elec- tro-dynamic nature of the sensor assembly. In ad- dition to the filtering of high-frequency events and since no electronic integra- tion is required, the design is immune to the saturation prob- lems that impair the
reliability of piezoelec- tric devices. Typical applications for
the VEL/GLF will be found in
windpower generation, hydro-elec- tric plants and cooling towers, on slow- speed pumps and also structural monitoring.
2021 /// Climatic & Vibration Testing \\\ 23
vibration monitor low-frequency Shock and OpsWatch Ethernet provides vibration monitoring
capability with connection over the Ethernet for live updates and parameter changes
A company that supplies shock and tilt sensors for use in the supply chain is now making its OpsWatch product available for monitoring vibration in a range of environments. SpotSee has
produced the sensor to enable suppliers to identify potentially damaging conditions in real time so that adjustments can be made before a failure occurs. The OpsWatch Ethernet sensor remains connected throughout its use to enable real-time monitoring over an Ethernet connection.
The device is designed to monitor
equipment in situ or in transit for low-frequency vibration or shock outside what is specified as the normal range. Users have access to a log of rich data made available by continuous monitoring, allowing engineers and maintenance teams to detect vibration patterns and any changes that might signal impending failure. Early warnings mean users can take steps to perform preventative maintenance and avoid extended periods of unplanned downtime. As a connected product, the device’s operational parameters can be changed, including ranges and thresholds, allowing users to customise it to their needs as required. With a wired Ethernet connection, the OpsWatch is more versatile than Wi-Fi connected devices in terms of their siting and can be used where wireless communication is difficult due to radio-frequency interference or radio propagation is inhibited, for example inside metallic structures.
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