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Air Monitoring


over Bluetooth and recorded data is logged on the in-built SD- card. Using its internal battery, the IP67 housing allowed the Water Company to locate the EDT outdoors for three months. The collected data pointed to specifi c events that prompted further investigation and ensured residents were no longer affected by emissions from the pumping station.


David Johnson, European Sales Manager at Alphasense Ltd comments: “the EDT was highly appreciated by our customer and the neighbouring residents. Following on from that success, we plan to launch additional EDT products, such as CO2


37


ensure the security of gas detector data transfer and the safety of the operation. The resultant mesh of sensors can therefore be both large and complex in shape.


and VOCs for


indoor air quality monitoring. Alphasense have been developing and manufacturing gas sensors for more than two decades, but this new product has really been an adventure for us into the Digital World”.


WirelessHART® builds a highly secure data mesh for gas detection


The cases above refer to QR codes and, both of which were developed in 1994 and are digital technologies that we encounter frequently in our daily lives. This next application uses a digital communications protocol that is perhaps less well known and is just over a decade old. WirelessHART®


is a networking technology


based on the Highway Addressable Remote Transducer protocol. WirelessHART®


is an open protocol and has been implemented Bluetooth NO2 Sensor Helps Identify the Cause of Nuisance Odours


Following complaints of nuisance odours, a major UK Water Company sought a cost effective method of monitoring and logging ppb levels of Hydrogen Sulphide (H2


S). It suspected the


gas was being released from their pumping station, located next to a new housing development. Challenges included its remote location without AC power and being an unmanned station, staff could not oversee the 24/7 monitoring.


Fortunately, the new Alphasense Electronic Diffusion Tube (EDT) was designed for use by local authorities to monitor either roadside Nitrogen Dioxide (NO2


) or H2 S odour in the wastewater


treatment industry. The battery-powered EDT was supplied pre- calibrated with a measurement range of 0 to 500 ppb, recording concentrations every two minutes.


Mounted on the fence line between the pumping station and housing development, it connects with a tablet or smartphone


into commercial products by several leading process automation companies. One such fi rm is United Electric Controls (UEC) of Massachusetts in the USA. They have integrated this communications protocol into their Vanguard range of wireless gas detectors. This takes process safety gas detection one step further up the ladder of reliability because the WirelessHART®


network of multiple


wireless gas detectors can transmit data in all directions and to and through all devices in the mesh. The implication is that if one device fails, or is taken out of service for routine maintenance, the data from the network of Vanguard detectors will fl ow through an alternative route to


Author Contact Details Stephen B. Harrison. sbh4 GmbH • Kranzlstraße 21, 82538 Geretsried, Germany • Tel: +49 (0)8171 24 64 954 • Email: sbh@sbh4.de • Web: www.sbh4.de


Product Manager for the Gas Detection Product line at UEC, Andrew Liptak, refl ects on their digital innovation: “when refi neries and gas storage terminals want to monitor for Methane and Hydrogen Sulphide they do so for good reasons: a gas leak can be toxic or cause an explosion. So, the combination of the gas detectors with this self-repairing wireless network mesh is the optimal solution to monitor for gas leaks in their hydrocarbon processing facilities. Furthermore, with a data transmission frequency of 8 seconds and a guaranteed battery life of more than 5 years we have broken new ground in the realm of operational longevity.”


All of our articles are online! To view and download them, visit: www.envirotech-online.com


Reliable web based monitoring solutions for air and water quality monitoring


Dexdyne’s web-enabled remote monitoring systems are used globally in numerous air quality and environmental applications. Their range of DX remote communication terminals (RCTs) can connect analogue/digital sensors directly and to any controller/PLC via a Modbus RS485/TCPIP.


Their technology acquires data, can be confi gured to trigger SMS alerts and transmit the acquired data to the cloud based dashboard server. The dashboard provides user friendly interface to the data and help the user to manage all their installations on-line from a single log- in from any web enabled device. There are no licensing fees and no limit to the number of users.


DX RCTs need no special software to be installed on your iPhone/PC/iPad/laptop. Data is sent over a secure GSM/GPRS/G4 or an ADSL link and this can be interchanged. There is no need to change any of your current infrastructure either, Dexdyne’s solution is controller agnostic.


Dexdyne are leaders in monitoring of sensors, instruments and remote processes. Delivering a service which captures invaluable raw data, allowing customers to analyse their data using an easy to use web based interface. Customers use the insight gained to increase effi ciency and up-time, while reducing costs. Dexdyne’s DXP100 unit is IP65 rated, robust and waterproof so ideal for deployment at outdoor operational sites for air and water quality monitoring.


For More Info, email: email:


For More Info, email: 47149pr@reply-direct.com www.envirotech-online.com IET November / December 2018


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