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NOTICE BOARD From : John Latter - 18.12.2009 Hi Mike, Many thanks for your help this morning. What a great service you offer with your web site, I am so glad I hit upon it. I am a Forester/ wood technologist and have been engaged by a major renewable energy generator to devise a system that will monitor the internal temperatures of huge piles of wood chips. The Power station will import a significant proportion of their wood chip fuel from North and South America. The shipments will contain up to 10,000 tonnes. The entire stock will be unloaded and transported to the fuel storage area in less than a week. The material will be used over an extended period of time. Moist wood chips will progressively heat when stored in large piles and have been known to spontaneous combust. Heaps will be up to 8 metres high with a large footprint >3500 m2. We will need temperature loggers with temperature range from 20 – 100C. We may well need some that can be used in a ships hold too. If you are able to post this on your enquiry channel I would be most grateful. Kind regards – John Latter Kuni Limited Tetbury GL8 8DL. UK +44 (0) 1666 500 487 +44 (0) 7831 565 300 From : Roy Adams - 4.12.2009 We have an pharmaceutical application on a newly-designed automated pick & place system connected to a liquid nitrogen freezer tunnel. The pick & place system is constructed as an insulted stainless steel enclosure and incorporates its own refrigeration systems to maintain a sub-zero temperature inside – to protect our frozen product. The are two sensing situations that we currently have problems with using Keyence sensors, these are: 1) Non-contact detection of (10) 4-mm thick ABS plastic storage box ‘shoebox’ that our frozen product is packed into. 2) Non-contact detection of frozen aluminium foil like product trays. Thickness of foil is nominally 0.5mm thick. Temperature range is nominally -25°C/-35°C but can reach -50°C depending on the temperature of the adjoining freezer tunnel. Frost build up over the sensors is resulting in false readings. There are situations where the system thinks an ABS ‘shoebox’ is in position when in fact we’ve removed it (caused by the frost coverage). Similar situation with the foil product tray, frost build up over the sensor indicates that product tray is present when it’s not. We’d appreciate any assistance by readers as we are running out of sensor options. We’ve considered mounting sensors behind heated glass to prevent frost build up but haven’t seen anything commercially available. Many thanks Roy Adams Email : Roy.adams@catalent.com From : Paul Josey - 18.9.2009 Hi, I am looking for a hydrocarbon to replace the existing hydrocarbon sensor that floats on the surface of the water, this sensor is prone to tangling with other cables when the pump starts. Many thanks and regards, Paul Josey E&P Engineer (CTRL) Email: paul.josey@networkrail.co.uk From : Navroz - 28.8.2009 I am looking for any sensor on belt conveyor that allows plastic garment hangers but stop any human getting trapped. Thanks Regards, Navroz Email : navroz.rashyani@mainetti.com From : Darwin Chevalier - 28.8.2009 We use an Eutech meter to measure pH and when testing and retest the same samples within 2 minutes between testing we get different reading, sometimes as much as 9.9 to 8.8 why? What meter do you recommend for a company to use with checking pH levels of a purified water. Thank you for your advice in advance, Darwin Email :dchevalier@essentiawater.com From: Sriram - 3.7.2009 Hello Sir/Madam, We are in need of Pressure Sensor with below specification. Need Your help in this. Specifications, Pressure to measure : 1 to 100mbar (if 1000mbar possible, it will be fine) Accuracy : +/- 0.5mBar Operating Temperature : -30deg C to +60deg C Size : Thickness - 5mm(max), Width/Length - 50mm Located in : Evacuated space Power : DC Regards, Sriram Email: srirama.chandra@in.bc From: Dan Dunlap - 18.6.2009 Sir - We are attempting to calibrate a dynamic torque measuring device. What the device does is measure how much resistance there is on a bearing after it has been pre-loaded. We want to ensure accuracy of the machine measuring this by calibrating it with a calibrated transducer connected in-line to a drag generator/inducer. What we need is something to simulate a preloaded bearing's drag force. This will help us avoid any inconsistency between parts. a. Do you have something that can be calibrated that will provide (induce) a constant 7Nm dynamic drag allowing us to eliminate the calibrated transducer? That would simplify things. b. If you don't have anything that precise, we would still like something to give us a reasonably steady(+ 5%) 7Nm force to be used with our calibrated transducer so we can adjust our test machine. The transducer has a male and female 3/8 in drive on either side we can adapt to the machine and whatever drag generator/inducer we can come up with. Thanks for the help Dan J. Dunlap Senior Engineering Analyst / Tool Design John Deere Drive Train Engineering Dept 50S Z2-SW4-06 Westfield Ave. Site Waterloo, Ia 50702 USA 319-292-4827 DUNLAPDANJ@JOHNDEERE.COM From: K. Ravisankar - 30.4.2009 We need to determine moisture in our Ammonia converter catalyst reduction sample. At the begining NH3 will be in ppm and gradually increase upto 16%. Moisture will increase slowly and reach 3000 ppm. The inlet gas composition is approximately N2 --> 20%, CH4 6%, NH3 --> 4% ; H2 --> 70% Thanks & with Regards, K. Ravisankar, Chemist, Laboratory, QAFCO, Mesaieed, QATAR. Phone: +974 4228540 Mob: +974 5217904 Email : kravi@qafco.com.qa From : Aisha - 29.4.2009 I would appreciate any help or suggestions. I am currently looking for a sensor (not too expensive)which would be able to measure the mass of some powder inside a spring of diameter 36.5mm. I don't know much able load cells etc. Ideally I would like to measure upto 50g of powder, and a resolution of 0.01g, but 0.1 is acceptable. Aisha - University College London Email : a.salihu@ucl.ac.uk From : Kevin - 9.2.2009 Hello, I am designing an anti-collision sensor for an autonomous blimp using ultrasonic transducers for my senior project. The problem I am having is that the signal amplitude seen at the receiver jumps up and down continuously. With such unstable signals, it is difficult to turn those voltage readings to anything useful. Can you suggest a way to somehow stabilize that signal? I have looked into programming solutions but I'd like to, if possible, take care of it with additional circuitry. Thank you. Kevin Email : Kmsc0303@yahoo.com From : Josh Bates - 2.2.2009 I have been tasked to come up with a test plan to observe the performance of lifesaving equipment being dropped into water. More specifically, I am looking at dropping a manikin fitted with different lifejackets from heights up to 100 feet. Also, different rescue baskets (stokes litters) will be dropped from these heights. The data I am interested in finding is: the force on impact with the water and the depths (with respect to time) of the specimens. Does anyone have any equipment available for this type of testing? A timely response is greatly appreciated. Best regards, Joshua Bates Email : josh@tulmar.com From: Simon Carter - 28.1.2009 Hi Mike, I am trying to research the appropriate transducers or sensors for a variety of applications. These include: 1. To detect water rising within a tank and at a predetermined level, switch a pumping system off. 2. To measure the surface temperature of a solid composite material up to 300 deg C. 3. To measure the flow rate of water up to 1.5 litre/min at a working pressure of 8 bar. 4. To detect and count empty cereal cartons as they pass along a conveyor 400mm wide. Are you able to suggest solutions to any of the above ? Any help would be very much appreciated, Simon Carter - Customer Technician, Raffenday, UK. Email : sncarter@raffenday.com From : Mits - 20.1.2009 Hello Mike, I am currently designing a sensor to find the optical density of a liquid medium. The requirements are that the sensor has to be extremely small & has to exhibit & detect all the wavelenghts from the visible spectrum.Do you know of any such available sensor to find the optical density of a fluid medium Thanking you, Mits Email : moonlit24x7@yahoo.com For Glossary of Terms page, click here ... 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