48 Advertisers Index COMPANY PAGE


a1-Cbiss Ltd ..........................................................ii, v Achema 2012 ......................................................32 Air Monitors Ltd..........................................................i Alphasense Ltd..........................................................5 Analytical Technology ..............................................15 AQE 2013............................................................25 Aquaread™ Ltd ......................................................19 Arablab 2012 ......................................................34 Banner Engineering Europe ......................................10 BW Technologies by Honeywell..............................OFC Campbell Scientific Ltd ............................................21 City Technology Ltd..................................................43 Dräger AG & Co KGaA ............................................7 Dresser Roots ........................................................16 Enviro Technology Services Plc ....................................ii Genevac Ltd ..........................................................33 Geotechnical Instruments (UK) Ltd ..............................40 GfG - Gesellschaft für Gerätebau mbH ........................3 GrayWolf Sensing Solutions......................................45 Henan Hanwei Electronics Co.,Ltd ..............................6 Hermann Sewerin GmbH ........................................42 Honeywell Analytics ............................................OBC ICMGP 2013 ........................................................37 ILM Publications ....................................................IBC Industrial Scientific Corporation ................................IFC Ion Science Ltd ......................................................41 ITT Analytics - WTW - Wissenschaftlich-Technische Werkstätten GmbH & Co ........................................11 LNI Schmidlin SA ....................................................28 Milestone Srl ..........................................................31 Olympus Industrial Systems Europa ............................30 OTT Hydrometry Ltd ................................................13 Palintest Ltd ............................................................18 PCME Ltd ..............................................................28 Richard Paul Russell Ltd ............................................22 RM Young Company ..............................................22 Scientific and Technical Gases Ltd ............................44 Shawcity Ltd ............................................................iv Sick Maihak GmbH ................................................29 Sira Environmental Ltd ..............................................iii Solinst Canada Ltd ..................................................17 Swan Analytische Instrumente AG ..............................14 United Kingdom Accreditation Service..........................vii WWEM 2012 ......................................................12


IET November/December 2011 www.envirotech-online.com


Permeation Tubes for Nitric Acid Vapour Used to Calibrate Air Monitors


Trace concentration mixtures of nitric acid vapour are particularly difficult to prepare and store due to the aggressive chemical properties of nitric acid. Even with conventional permeation or diffusion tubes, establishing the nitric acid emission rate of the device can be problematic. Reagent grade nitric acid is relatively stable but contains thirty percent water and emission is the azeotrope. Pure nitric acid spontaneously decomposes even at room temperature liberating large amounts nitrogen dioxide. In either case, traceable weight-loss certification is not possible.


KIN-TEKs (USA) Trace Source Permeation Tubes use a mixture of reagent grade nitric and sulphuric acids as the analyte source. The sulphuric acid binds the water, reducing water emission to negligible levels. Emission of the sulphuric acid is extremely low compared to that of nitric acid, so the emission is primarily nitric acid. Formation of nitrogen oxides in the vapour is minimised by dynamically blending the emission to form trace concentration mixtures that are then used immediately.


Tubes are available for concentrations from low ppb to to about 10ppm in 1 l/min dilution flow. Reader Reply Card No. 127


New Digital Differential Pressure Sensors with Low Power Consumption


Sensirion (Switzerland) recently launched new differential pressure sensors in the SDP600 series. The new SDP6x6 sensor line features especially low energy consumption, making it suitable for long-term battery operation. The SDP606 and SDP616 sensors are designed to enter sleep mode after performing each measurement. They wake up when a “measure” command is received and enter sleep mode again after completing


the measurement. The operation currents of a standard SDP600 sensor can be high as 6 mA, but


the new SDP6x6 sensor is optimised for operating currents no greater than 400 µA. There is virtually no current drain (<1 µA) in sleep mode.


This drastic reduction in power consumption allows the new sensors to be used in battery powered applications. The new differential pressure sensors are excellent solutions for medical and HVAC applications, where high accuracy and reliability with very low energy consumption are required.


The new sensors extend the comprehensive product range of Sensirion’s digital differential pressure sensors in the SDP600 series. Along with the other products in this series, they offer a digital I2C output and are fully calibrated and temperature compensated. Thanks to the principle of calorimetric flow measurement, CMOSens®


differential pressure sensors achieve outstanding sensitivity and


accuracy even at very low pressure differences (< 10 Pa). Furthermore, they have very high long- term stability and are free from zero-point drift. Like all devices in SDP600 series, the new sensors are available in two dif-ferent versions. The SDP606 is intended for direct threaded connection to a pressure manifold with O-ring sealing, while the SDP616 is designed for tube connection.


Reader Reply Card No. 128


Guide to Selecting an IR Camera for R&D Applications


Drawing upon over 50 years experience of designing and supplying thermal imaging cameras for Research and Development applications - FLIR Advanced Thermal Solutions (France) have developed an informative new guide entitled ’7 Things to Know When Selecting an IR Camera for Research & Development’.


Every day researchers throughout the world are looking for new methods to help them solving their scientific questions. Infrared thermography has proven to be an invaluable tool to solve a wide variety of scientific problems based on heat and temperature measurement.


Because of its non-intrusive analysis capacity, thermography systems have become indispensable instruments for a wide variety of Research & Development applications. In Research & development - thermal imaging cameras are typically used for capturing thermal distribution and recording temporal variations in real time, allowing engineers to see and accurately measure heat production or dissipation process, leakage and other temperature factors in equipment, products and processes.


Reader Reply Card No. 129


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