Test and Measurement

Vibration measurement fl exibility provides enhanced protection

The advantages of applying vibration condition monitoring to rotating equipment is well established but this technique can only provide the maximum benefi t when applying the correct measurement technique. So what is the correct measurement and how is this implemented?


hat if I need to make a change to the

measurement to optimise early fault detection? Whilst industrial vibration

sensors offer a broadband performance suitable for most machines it’s the signal processing that makes the difference. Furthermore, the right hardware that provides a range of measurement algorithm options will maximise the return on investment and future proof the installation.

Typically the higher cost of more sophisticated vibration monitoring systems offering this type of fl exibility can be diffi cult to justify for smaller machinery. This is why condition monitoring specialist SENSONICS developed the DN26 G3 protection monitor to provide a more suitable stand-alone monitor to complement their successful range of rack- mounted products. The dual channel din rail mountable unit provides monitoring of bearing vibration, shaft vibration, or shaft position with fully programmable signal conditioning and

with a range of measurement algorithms and sensor options.

The unit is designed for optimum

fl exibility; as a universal module (single hardware platform) it is fi eld upgradable and fully programmable. Special protection options include slow rotation vibration monitoring down to 0.2Hz and narrow band fi lter measurements for specifi c vibration signatures. In addition the DN26 G3 offers a dedicated speed monitor channel which can also be utilised as a phase reference for further harmonic analysis of the vibration signals. The sensor interface is programmable to accept IEPE type accelerometers / velomiters, proximity probes (API 670 standard), and active / passive speed probes. All sensor signals are available via a buffered interface which provides the option

of further detailed analysis if required. Three alarm relays are available as standard (expandable to up to seven relays via a digital interface), one dedicated to indicate module and sensor integrity. The other two relays are fully programmable across the alarm criteria selected and all three input channels measured values are available via a 4-20mA interface. The unit is available with Ethernet communications as standard, permitting confi guration either locally or remotely through the in-built webserver and offering Modbus over TCPIP for connecting measured data to other plant wide systems. The DN26-G3 features a built-in intuitive colour LCD display and menu drive facility providing various display modes and an alarm historian with real time logging capability.

Densitron squares up for test and measurement

The advantages of applying vibration condition monitoring to rotating equipment is well established but this technique can only provide the maximum benefi t when applying the correct measurement technique. So what is the correct measurement and how is this implemented?

ensitron has introduced a novel, square format 1:1 aspect ratio 4.0’’ Industrial Rugged TFT Module with exceptional features designed for operation

in challenging environments.

Aimed at instrumentation; handheld test and measurement applications; and niche security products, the module’s in-plane switching (IPS) glass uses automotive grade fl uid capable of operating from -30°c to +85°c, ideal for use in harsh environments with extreme temperatures.

Further to this ultra-wide operational temperature feature, Densitron engineers have

30 October 2020

combined an ultra bright, compact LED design that delivers 1000 candelas per square metre peak luminance in a 2.3mm overall mechanical depth. The module boasts 50,000-hour LED MTBF and is designed for longevity with anticipated production spanning 5-7 years. Densitron UK business development manager Richard Applin says, ‘’Square format industrial TFT modules have been the preserve of niche avionic instrument clusters, but we see a wider remit within many styles of instrumentation. We wanted to solve real world engineering problems and offer a unique module which can operate in the harshest of environments.’’

Components in Electronics

The module’s 480x480 display resolution delivers a crisp user interface; large all-round viewing angles; high contrast; and a black default state.

Solisbond, Densitron’s proprietary optical bonding process, can be applied between the TFT glass and PCT sensor to improve and enhance optical performance in direct sunlight. Applications can dim the LED array in low ambient light levels or indoors; but can drive the module at suffi cient brightness to counteract the strongest direct sunlight, making this module ideal for outdoor operations. Densitron has also manufactured an industrial projected capacitive touch (PCT) sensor as standard and can offer bespoke cover lens design for any client project. Continuing to reduce barriers for engineering design, users can benefi t from stock holding for samples; fast production lead times; and no minimum order quantity, even for customised orders.

Applin adds, “This new display greatly expands the operational range of our industrial display models. As many industries, including broadcast, are expanding their remote production capabilities, this enables those same organisations to reach further into remote environments that would previously have been operationally prohibitive for typical test and measurement devices due to temperature extremes. It’s just one more way that our engineers have found to extend the boundaries of what is possible.” The new modules are available now from Densitron and resellers worldwide.

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