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SENSORS & SYSTEMS Flow, Level & Pressure Measurement Simple monitoring and logging of flow and process variables JBJ Techniques reckons it has spotted a gap in the market for an effective, simple to use, four-channel process monitor and alarm controller, combined with PC-based visualisation and data logging software. So the company has addressed this requirement by developing its own cost-effective package. Mark Simms reports Why is it that, in so many different industries and market sectors, there are a myriad of all-singing-and-dancing high end products, swathes of simple, lowend, single-function products, but very little in between. Take, for example, the monitoring of fluid systems in various processes. At one end of the scale, there are simple indicators to show pressure or flow – barely more than a dumb display with an alarm output or two. And then at the other end you can spend many thousands of pounds on custom designed data logging and analysis software that will monitor as many channels as you could conceive and give you more alarm outputs than you could imagine. But what lies between these two extremes? In reality, very little. This gaping hole in the market had not escaped the attention of JBJ Techniques. And it became particularly apparent when the company looked around for an effective process indicator and alarm controller to accompany the high quality flow meters that it distributes for Italian manufacturer Siem in the UK. “As standard, the flowmeter came with a fairly basic, single channel indicator with a four-digit display and a couple of alarm outputs,” says product development manager Tony Fletcher. “But our experience of the market is that anyone monitoring flow is also going to interested in one or more pressure points, temperature variations, and perhaps a range of other process variables. There needs to be an instrument with that sort of functionality mounted locally. “At the same time, it’s rare these days not to need some remote monitoring and datalogging capability, but there’s nothing out there that can address the sorts of markets we’re looking at straight out of the box. There are lots of very good packages that you can program to fit the bill, but those packages are not cheap and the programming requirement is far from trivial.” This, then, was the market need that JBJ Techniques sought to address. And the first part of its solution was a new process instrument capable of displaying up to four process variables, and providing all the outputs that engineers could need for a typical process application. The unit provides a dedicated pulse input for flow meters, with the remaining inputs configurable either as three 4-20mA inputs (for the likes of pressure sensors and thermocouples) or as two 4-20mA inputs and one thermistor input. Two alarm outputs are provided with no-volt contacts, along with a 4-20mA output of the flow. “It’s a modern-looking process monitor with flexible set-up options and all the functions that today’s applications require,” says Fletcher. The unit also sports a serial port on the rear, making all of that data available to a connected PC. And that was where the next stage of development took JBJ, with the design of a complementary software package. Ready to run, straight out of the box “Our goal,” says Fletcher, “was to create something akin to a dashboard for a hydraulic system – a complete package that was ready to run straight out of the box and which would provide hydraulic systems engineers with all the information they needed in order to monitor the process, perform trend analysis, diagnose faults, dig down into systems and store historical data.” On launching, the software presents you with four graphical digital displays, but each can be toggled between various display options, including the likes of analogue dials and temperature gauges. All of the inputs to the local process monitor are retransmitted to the PC as standard, so you just need to select the input ports from within the software to make that data available. Then you simply set your scaling, alarm points, data logging intervals and a few other set-up parameters, and you’re ready to go. The software does everything you need it to do, combining full data logging capability with a real-time line graph display of the four process inputs. The sampling interval can be set at anything up to a frequency of 500 samples per second, which Fletcher reckons is more than good enough for pressure transient analysis in hydraulic systems. All data is logged as standard, complete with time and date stamp, and that data can be readily accessed, or pulled straight into a spreadsheet package from where any number of graphically-based reports could be generated. High and low alarm points can be set for each channel, and the software creates a separate log file for all data taken whilst in the alarm state. It also records the time and date going into and coming out of the alarm state, whilst the graphical display highlights the maximum deviation whilst in the alarm state. The real-time line graph monitor builds in a high degree of display flexibility, including allowing you to zoom in on events. So, then, here we have a package which is highly flexible, simple to use, and that is a fraction of the price of other graphical monitoring systems. In fact, probably the best way to look at the cost is that you’re buying a high quality, four channel process instrument, and getting the software thrown into the bargain, free of charge. And whilst it might have been designed to meet the needs of hydraulic system monitoring, the adaptability of the package means that it is equally applicable across a far broader spread of applications. “There are lots of instruments out there, and lots of software monitoring packages, but nothing that really addresses the market for essential monitoring and cyclic testing of hydraulic pressure lines, or indeed any other applications involving combinations of pressure, flow and temperature variables,” concludes Fletcher. “What we’ve done is to look at the real requirements of those applications in terms set-up, functionality and resolution of data, and bring together an affordable, easy-to-use solution that answers those needs.” MORE INFORMATION: Enter D465 on the enquiry card or visit ‘latest issue stories’ at www.industrialtechnology.co.uk for further details. You can also find more stories from JBJ Techniques and more news on hydraulics 46 INDUSTRIAL TECHNOLOGY • May 2008
Look no further for great deals on flow switches PVL, which has been distributing the full Honsberg range for many years, says it is offering better deals than the major catalogues on most Honsberg products – without changing its prices or making special offers. “We work closely with the Honsberg design team to meet customers’ needs, and have realised that, even with that service, our prices are lower than the catalogues,” explains PVL managing director Steve Moorey. “OEM customers are buying from us every day.” Moorey says that Honsberg CRE flow switches give the widest range of fittings and sizes available in Britain, and can solve just about any flow switch problem in the business. With a standard 1in BSP fitting, the CRE paddle flow switch can be fitted to any pipe from 1in to 6in diameter just by fitting a 1in BSP stub to the pipe whose flow is to be measured and fitting the flow switch to the stub. So one type of Honsberg mechanical flow switch covers nine different standard pipe sizes with excellent repeatability and very low pressure loss. MORE INFORMATION: Enter D475 on the enquiry card, or visit www.industrialtechnology.co.uk for further details from PVL LOW COST CAPACITIVE SENSORS for... ...INCLINATION Range ±1º to ±80º Resolution from 0.001º Integrated electronics Analogue or digital outputs ...ACCELERATION Range ±1g to ±1000g High output Body weight 3.5 grammes We offer low cost OEM solutions for measurement problems on many applications including vehicles, buildings, seismic, process machines, cranes, bridges, mining, safety, etc. Sensors UK Limited 137a Hatfield Road, St. Albans AL1 4LZ Tel: 01727 841692 Fax: 01727 844272 www.sensorsuk.com CAP1 More details: Write in 470 on the free information card Get your FREE GUIDE to CANbus technology Written by the experts here at Sensor-Technik, The Engineer’s Guide to CANbus is, we would modestly suggest, one of the most comprehensive and practical publications on CANbus technology that you’ll find anywhere. I’m Morten Moller, managing director of Sensor-Technik UK, with over 25 years of industry expertise behind me. When you deal with Sensor-Technik UK, all the advice and support I can give you comes as part of the package. SENSOR-TECHNIK UK Unit 10, The Granary Mill Road, Sharnbrook Beds MK44 1NN Tel: 01234 782049 info@sensor-technik.co.uk www.sensor-technik.com The CANbus, pressure, force & rotary measurement specialist More details: Write in 471 on the free information card More details: Write in 472 on the free information card 47
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