38 Air Monitoring A new revolution in multi-parameter IAQ, toxic gas probes
Building on 20 years of customer feedback, the all-new range of DirectSense II smart probes are being introduced by GrayWolf. These cutting-edge air monitoring probes accommodate from 2 up to 8 plug-and-play smart sensors into a single hand-held, desktop or wall-mounted housing. Choose from 25 different indoor air quality, green building, industrial hygiene and HVAC parameters including; TVOCs (PID), carbon dioxide (NDIR), carbon monoxide, ozone, nitrogen dioxide, ammonia, sulphur dioxide, chlorine, hydrogen sulphide, %RH, °C/°F and many others.
The DirectSense II probes connect to GrayWolf’s AdvancedSense® meters which enable additional parameters such as Particulates, Differential Pressure, Air Velocity and Formaldehyde. They may also be connected to GrayWolf-supplied tablet PCs, and Windows PCs for real-time display, data logging and/or remote access. Connection is via cable and/or Bluetooth wireless (both come as standard). In addition to the broad offering of parameters, there are also different sensor ranges to choose from for some of those parameters to best fi t specifi c applications.
The probes are housed in a rugged enclosure with rubberised grips for hand-held use and for added drop protection. Brass threading on the back accommodates belt clips (convenient for walk-thru surveys), and tripod mounting when long-term trend logging. A secure hatch allows user access to replace or swap the smart sensors. Calibration and additional sensor specifi c data is stored on a micro-board, which makes the smart sensors truly “plug-and-play”. Yet, there is no signifi cant loss of limits-of-detection (crucial for IAQ applications) or reduction of other sensor performance due to any noise introduced by these convenient/effi cient “smart” boards. In fact, CO2 and TVOC sensors achieve improved performance vs. GrayWolf’s original DirectSense probes.
The new probes have rechargeable Li-ion batteries and come with a charging stand that includes wall-mounting brackets for continuous monitoring applications. The probe may alternatively be powered from the connected platform (AdvancedSense, tablet or PC). A built-in fan eliminates sensor heating effects and improves sensor response time.
Data logging can be initiated from the probe using a convenient, tactile LOG button. Extensive, versatile features are also enabled when connecting to the various available platforms. These include built-in cameras/microphones/virtual keyboards (all for secure, effi cient documentation of data fi les), on-board training/application videos, Wi-Fi remote data access and alerts, and much more.
The DirectSense II probes may be used for walk-thru surveys, long-term trending or continuous monitoring. Green building applications such as USGBC LEED EQc4 pre-occupancy, IWBI WELL air screening/ monitoring and GBCI Arc “Human Experience” testing are comprehensively fulfi lled. Many other IAQ, HVAC, IH, IVF, R&D and other applications are also well accommodated.
GrayWolf’s DirectSense II smart probes can connect via cable or via Bluetooth wireless, at the choice of the user. They are also automatically recognized by the meter or PC that they are interfaced to. By industry standards, each of these features would qualify the title of “smart probes”. However, the probes additionally incorporate “smart”, plug-and-play sensors that may be easily changed out by users in the fi eld. Plus, the smart probes conduct ongoing diagnostics on the smart sensors. VERY smart, indeed!
Indoor air quality, green building, occupational hygiene and HVAC applications require a broad range of parameters to be quickly spot-surveyed and to be accurately monitored over time. The DirectSense II probes not only allow for a very broad range of applicable parameters, but they can easily be expanded for additional parameters. Sensors are interchangeable to target the ideal range needed for the specifi c application. This is not only convenient, it means access to reliable measurements for the application.
End-users are best served by the sensor technology that is most suited for their application. GrayWolf’s DirectSense II probes permit end-users to utilize a consistent product, with extensive features, and to easily replace sensors for the specifi c application at-hand. Rather than operating numerous different instruments, with inconsistent operation/features/service requirements/reporting, the DirectSense II probes empower anything from simple to advanced features for an extensive variety of sensors applicable to a broad range of air measurement and testing applications. Documentation of surveys and long-term testing is also important. GrayWolf enables reliable documentation and effi cient reporting when probes are interfaced to AdvancedSense meters or to Windows tablets.
Control and monitor multiple gases with the Rapidox 7100
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47646pr@reply-direct.com
FTIR technology gives air monitoring a sporting chance Air quality is becoming a very widely discussed topic in the context of
exhaust emissions from vehicles and factory pollution. During the Beijing Olympics in 2008, factories were closed down and traffi c was restricted to prevent the build-up of toxic gases having a negative effect on the performance of the athletes. With heavy exercise, oral respiration is the predominant mode of breathing and much larger amounts of pollutants are delivered to the lower airway resulting in a signifi cant impact upon the respiratory tract. In high profi le events, the impact of air pollutants and subsequent adverse ventilatory changes can cost those small increments of time that are all important.
The Rapidox 7100 Multigas range of analysers, from Cambridge Sensotec, is a high specifi cation instrument designed specifi cally for the analysis, control and monitoring of process gas within a wide range of industries.
Applications within chemical processes, research and development, gloveboxes, biogas and emissions are the perfect companion for the Rapidox 7100, the multigas analyser that can measure up to six gases simultaneously. Using a range of high precision gas sensors, each sensor is designed and calibrated to avoid any cross-interference effects with the background process gas.
Measurable gases include oxygen (O2 carbon dioxide (CO2 (H2
), ozone (O3 ), hydrogen sulphide (H2
dioxide (NO2 chlorine (Cl2
), nitrous oxide (N2 ), methane (CH4
), moisture (H2 ) and ethylene (C2
), carbon monoxide (CO), O), hydrogen
S), nitric oxide (NO), nitrogen O), sulphur dioxide (SO2
H4 ).
A 7” (180mm) full-colour touch screen interface with soft menu keys allows for easy operation in either permanent monitoring or sampling modes. All data is continuously logged for review and inspection and Excel compatible data can be downloaded via a USB memory stick.
For More Info, email: email:
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47533pr@reply-direct.com ),
Greenhouse gases and other air pollutants have spectral signatures in the mid infra-red region of the spectrum. This creates an opportunity for infra- red sensing technology to play an important role in measuring the air quality at major sporting events and assessing the role that air pollution has on infl uencing performance.
Fourier transform infrared spectrophotometry has become a well-established method to measure the concentrations of air pollutants. An FTIR interferometer splits one beam of light from a broadband source into two using a beam splitter, transmitting the fi rst beam to a fi xed mirror and the second to a mirror that is translated back and forth very precisely so that the paths of the two beams are different. The device then recombines the beams and directs them through the sample to the detector. The time variation in the path difference between the two beams modulates each wavelength of the collected radiation at a unique frequency that is a function of the wavelength of the radiation and the velocity of the moving mirror. Breaking down the signal generated by the detector into these unique frequency components reveals how the individual wavelengths from the broadband source interact with the sample under test generating a molecular fi ngerprint.
Infrared detectors used at the heart of the FTIR spectrophotometer must have the following characteristics; wide spectral response range, high sensitivity, wide frequency bandwidth, good linearity. Laser Components offers DLaTGS pyroelectric detectors that are ideal for this demanding application. From their research and production facility in Florida they supply customers all over the world with these industrial grade thermal detectors. A pyroelectric infra-red detector responds to a change in IR radiation (heat) absorbed on its surface and they have a very wide spectral bandwidth. A pyroelectric crystal has an atomic structure that will move slightly in response to a change in temperature, rearranging the electric charge within the solid generating a voltage.
Instruments using FTIR techniques are being introduced to measure air pollution and the measurements are used to help organisers plan a strategy for their sporting events. For example, the Indian Cricket Board organised their test match schedule and venues based on seasonal variation in air pollution.
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Take a look at our website
www.envirotech-online.com
IET November / December 2018
www.envirotech-online.com
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