-------------------------Monitor------------------------ The Newsletter for PC-Based Data Acquisition and Control Issue 168 www.windmill.co.uk July 2012 --------------------ISSN 1472-0221---------------------- Today we are delighted to launch the 851-pH Data Logger which monitors up to 16 pH probes, controls digital outputs, counts and can measure other parameters like temperature and pressure alongside pH. I hope find the newsletter useful, but should you wish to remove yourself from our mailing please go to Monitor Newsletter CONTENTS ======== * Windmill News: pH Data Logger is Built for Accuracy and Reliability * DAQ News Round-up ________________________________________________________ ________________________________________________________ New pH Data Logger is Built for Accuracy and Reliability ________________________________________________________ We are pleased to launch the 851-pH Data Logger, which continuously monitors readings from 12 or more pH probes. It is available on-line from https://www.windmillsoft.com/daqshop/pH-data-logger.html. The pH Data Logger: - communicates with a PC over Ethernet or Internet - includes the powerful yet easy-to-use Windmill software: no programming required - with automatic ranging lets the software match the pH signal as closely as possible - employs an integrating analogue-to-digital converter to reduce electrical noise errors - lets you choose the resolution of the A-D converter from 12- to 18-bits for optimum accuracy - provides automatic recalibration - lets you set two alarms on each pH probe - also offer digital inputs and outputs, and event and frequency counting - comes with free technical support for life and a money-back guarantee pH Measurement ============== The 851-pH package comprises an 851 Data Logger and a pH connection box. Just connect your pH probes to the pH box's input protected sockets, plug the box into the 851 Data Logger and away you go. This method of connection means you can use the 851 Data Logger to monitor, for example, temperature, flow or level at the same time as pH. The standard pH package handles 12 pH electrodes, but can be expanded to 16 electrodes on request. Designed for Accuracy ===================== The voltage produced by a change in pH is very small. A change of one pH unit on the pH scale produces (ideally) a change in voltage of 59.16 mV at 25 degrees C. With the 851-pH package you can choose a narrow input range such as +/- 10 or 100 mV, or select autoranging to let the software automatically choose the best range for your measurements. Choosing the smallest range that encompasses your signals will optimise the resolution of the measurement. You can also choose the resolution of the analogue-to- digital converter, selecting 18-bit for more accurate measurements. The higher resolution slows down the system to 6 samples per second, but as pH changes relatively slowly this is not generally a problem. If you need faster measurements, choose 16- or 15-bit resolution. An integrating analogue-to-digital converter reduces internal noise and a differential amplifier helps reduce external noise. To further improve accuracy, make sure you keep the wires between the electrodes and the pH box short - spanning not more than a few meters. Set Alarms on Each pH Probe =========================== You can set two alarm levels on each pH probe, and specify what happens when each alarm threshold is crossed. For example, an buzzer could be sounded or other equipment switched on. Data Acquisition Software ========================= Windmill Software is included in the 851-pH package. Our modular suite offers data logging, charting, alarm indication, output control and real-time links to other applications like Excel. You can also add process mimic generators, sequence control and many other modules. Should you wish to program the hardware yourself, you can use the IML Tools to do so. Alternatively you can use the 851 as a stand-alone Data Logger, saving 65000 scans of all connected pH probes to memory. Further Reading =============== More information on the 851-pH data logger, https://www.windmillsoft.com/daqshop/pH-data-logger.html How to measure pH with a computer, http://www.microlink.co.uk/pH.html; accessed 30 July 2012. Monitor Issue 93: The origins of the term pH ________________________________________________________ ________________________________________________________ DAQ News Round-up ________________________________________________________ Welcome to our round-up of the data acquisition and control news. If you would like to receive more timely DAQ news updates then either follow us on Twitter at http://twitter.com/#!/DataAcquisition or grab our RSS newsfeed at https://www.windmillsoft.com/monitor.xml Seabed sonar measures marine energy effect on wildlife Scientists are measuring what effect tidal turbines have on wildlife. They have combined two sonar systems on a seabed frame. These have been adapted to operate autonomously in combination for several weeks, while facing upwards. Collecting the data in this way allows imaging of a full 'acoustic curtain' along the tidal flow and around the turbine in a highly challenging environment. Source: SCUBA News http://news.scubatravel.co.uk/ NIST Measurement Advance Could Speed Innovation in Solar Devices A new versatile measurement system devised by researchers at the National Institute of Standards and Technology accurately and quickly measures the electric power output of solar energy devices, useful for developing the next-generation of solar energy cells. Source: NIST https://www.nist.gov/ Motion detection technology identifies lameness in horses A motion detection system outperforms vets when assessing horses for symptoms of lameness. Sensors are placed on the horse's head, right front limb and near the tail. Source: University of Missouri http://munews.missouri.edu/ Market for Photoelectric Sensors Faces Increasing Demand The market for photoelectric sensors experienced a collapse and a dramatic rebound in the last three years. The demand for sensing is increasing with overall demand for sensors rising faster than for industrial automation in general. Source: ARC Advisory Group http://www.arcweb.com/ Dolphin research could lead to man-made sea mine detectors Research into the way dolphins use sonar could lead to new man-made systems for detecting sea mines in difficult conditions. Source: The Engineer https://www.theengineer.co.uk/ ________________________________________________________ ________________________________________________________ * Copyright Windmill Software Ltd * Reprinting permitted with this notice included * For more articles see http://www.windmill.co.uk We are happy for you to copy and distribute this newsletter, and use extracts from it on your own web site or publication, providing the above notice is included and a link back to our website is in place. An archive of previous issues is at http://www.windmill.co.uk/newsletter.html and an index of articles at http://www.windmill.co.uk/monitorindex.html Windmill Software Ltd, PO Box 58, North District Office, Manchester, M8 8QR, UK Telephone: +44 (0)161 833 2782 Facsimile: +44 (0)161 833 2190 E-mail: [email protected] http://www.windmill.co.uk/ https://www.windmillsoft.com/
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