22 Gas Detection
Innovative PbSe detectors offer ideal solution for gas measurement at low concentration levels
Non-Dispersive Infrared (NDIR) spectroscopy is by far the most commonly used gas detection method used today. Gas is passed through a measurement cell where a broadband IR source is used to emit light through the cell to a detector. The detector uses IR optical fi lters to fi lter the light into an active channel at the absorption wavelength of the target gas and a reference channel. The advantage of NDIR comes from the strength of absorption in the mid IR compared to methods based on near infrared. The strong absorption allows relatively low concentrations of gas to be detected with small path lengths and inexpensive components.
Product line expanded with CIO2
and Acid sensors
MEMBRAPOR is continuously upgrading and advancing its product line. One of our latest additions are the ClO2 Acid sensors. ClO2
and is being
used as bleaching agent, for water chlorination and as well as strong disinfectant, hence detecting safe levels is important. Whereas the Acid sensor is mainly used is to detect organic acids in various applications.
While launching new types of sensors MEMBRAPOR is always driven to improve continuously the well- established ones, especially regarding long-term stability and reliability.
MEMBRAPOR‘s product range includes more then 300 sensors for > 20 gases covering
various measurement ranges, for your: fi xed-point detection systems, portable gas detectors, air quality monitors and fl ue gas analysers. More information online:
ilmt.co/PL/Qd6n
For More Info, email: email:
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47586pr@reply-direct.com
In order to measure gases at particularly small concentrations or very quickly a high sensitivity detector is required, PbSe devices with a responsivity of values of as high as 120k V/W. The devices are manufactured in standard TO style packages and have long expected lifetimes, making them ideal for fi t and forget applications such as gas sensing.
Laser Components manufactures a range of innovative lead salt detectors at their factory in Tempe, Arizona. The PB55 is a collection of thermo-electrically cooled polycrystalline biased single element PbSe detectors with a 20% cut off? at 5.2 microns and a maximum element size of 6 x 6mm2.
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47744pr@reply-direct.com
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to get there. together.
Laser Gas Detection Your OEM Partner for Gas Sensing Applications
Innovative new micropump offers improved sensitivity and size reduction for gas detection systems
TTP Ventus is working with leading manufacturers to exploit the unique benefi ts of its multi-award-winning Disc Pump. The breakthrough micropump technology addresses many issues that designers of gas detection systems face, allowing instruments to reach new levels of measurement sensitivity and control whilst also benefi ting from the pump’s miniature size, silent operation and wide operating temperature range.
Conventional pumps introduce airfl ow pulsation that often limits the signal-to-noise ratio and the resulting sensitivity. Instruments often include baffl es, accumulators and other damping hardware to reduce pulsation. Disc Pump cycles at 21 kHz and moves a tiny quantity of air each cycle, typically in the range of 10s to 100s nanolitres. The resulting ultra-smooth fl ow means that gas can be delivered directly to the sensing element, allowing damping hardware to be removed altogether, reducing system size and complexity.
One company already taking advantage of this benefi t is leading gas detection manufacturer Ion Science: “Disc Pump’s smooth fl ow is important to prevent noise on our sensors – the less noise the greater sensitivity we can achieve.” commented Peter Morris, Technology Manager. “It will also help us to easily maintain constant fl ow via a feedback loop – as our system will change over time this is an important benefi t.”
Airfl ow control is also improved with Disc Pump which can hold set points to within fraction of a percent when operated in a closed-loop. The stable output helps to minimise integration error when calculating the pumped volume, which in turn supports accurate concentration measurements into the ppb range. Furthermore, unlike a motor-driven pump, Disc Pump has no minimum (stall) speed. As a result, pressure and fl ow can be stably controlled from less than 0.1 cc/min to greater than 1 L/min, offering a near-infi nite turn-down ratio.
Swiss made
Our OEM Laser Gas Detection modules are stand-alone and ready to be used for selective detection and monitoring of gases.
www.axetris.com IET November / December 2018
www.envirotech-online.com
TTP Ventus recently announced the introduction of its XP Series, the latest pumps to emerge from its strategic development pipeline. The new pump range offers improved performance and effi ciency, and a wide temperature range of -25 to +55 C to support a diverse range of gas detection applications, from air quality monitoring to laboratory analysis.
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