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Pressure measurement


Pressure and leak noise monitoring


Methylene Diphenyl Diisocyanate, turnover $60 billion annually and have manufacturing sites all over the world. When Wanhua Chemical required both


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pressure and leak noise monitoring for their water network, they turned to HWM for a bespoke solution. Approaching HWM with a unique set of


requirements, Wanhua Chemical needed accurate monitoring of both the pressure within their water network and leak noise to identify leaking pipes. To be able to meet these specific


requirements HWM combined its Multilog LX2 datalogger with a Hydrophone sensor. The Hydrophone is able to monitor both pressure and leak noise, while the Multilog LX2 device records the data and uses both 3G and GPRS transmission to provide Wanhua Chemical with the recorded information. Wanhua Chemical are the first company to


use the combination of Multilog LX2 and Hydrophone to monitor both pressure and leak noise. Successfully installing 42 loggers now allows Wanhua Chemical to completely monitor their water network at one of their main manufacturing sites. Throughout the trail and installation process


anhua Chemical, a global leader in polyurethanes and the world’s largest manufacturer of


HWM has offered regular support to Wanhua Chemical, including weekly meetings to discuss the status of the project. HWM have also been able to support in


choosing locations within the network for the loggers to be placed. One logger was found to be picking up external noise after installation which was resulting in false leak readings, but this was quickly rectified during these regular


PRESSURE TRANSDUCERS FOR AUTOMOTIVE APPLICATIONS


Omega’s high accuracy piezoresistive pressure transducers have a proven record in high performance commercial and aerospace applications for over 25 years. The piezoresistive process uses strain gauges molecularly embedded into a highly stable silicon wafer. The silicon wafer is diced into individual die which each contain a full strain gauge bridge. The die is mounted in a sealed chamber protected from the environment by glass to metal seals and a stainless steel diaphragm. A small volume of silicone oil transfers the pressure from the


diaphragm to the strain bridge. The construction provides a very rugged transducer with exceptional accuracy, stability and thermal effects. A unique design ruggedises the transducers by providing secondary fluid containment in the event of a diaphragm rupture. During Omega’s production process, automated test equipment


performs pressure and temperature cycling on 100 per cent of the PXM409 series transducers. The transducers are then calibrated using


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extremely high accuracy standards and a five-point traceable calibration cer tificate is included with each transducer. The inherent stability of the piezoresistive core provides excellent long term stability, repeatability and very low thermal effects at the price of much lower performance transducers. Standard features of the PXM409 Series also include protective features built into the electronics and the pressure element. Reverse polarity, EMC, and power supply fluctuation protection are standard on all models. Intrinsically Safe and CSA ratings are optional.


wwww.omega.co.uk January 2019 Instrumentation Monthly


support meetings and results are now more accurate as a result. With ongoing support from HWM,


Wanhua Chemical will continue to successfully monitor their water network using the innovative combination of Multilog LX2 and Hydrophone.


HWM www.hwmglobal.com


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