A sensor to measure arsine gas in the ppb range


New hydrogen-compensated carbon monoxide sensor in 5-series format


with extended lifetime is ideal for harsh environmental conditions MEMBRAPOR provides a vast array of different electrochemical gas sensors for more than 25 gases in a variety of housings. They have recently announced the launch of the new Vantage series, with the same dimensions as 5-series sensors. The new housing has been developed thanks to the fi nest engineering and over a quarter of a century of gas sensor experience. The sensor has been designed to operate in the harshest conditions, such as environments with high humidities and temperatures as high as 60 °C.


The fi rst sensor with Vantage housing is a CO sensor for use in fl ue gas/stack gas analysis; this is an H2-compensated, 4-electrode sensor with virtually no sensitivity to CO on the auxiliary electrode. Moreover, its temperature dependence can be kept fl at, resulting in exceptionally precise ppm readings.


MEMBRAPOR sensors are renowned for lasting for many years and the new Vantage housing offers the additional advantage of featuring a replaceable fi lter. While a typical CO sensor will typically last for three or more years, the fi lter itself has a signifi cantly lower lifespan. Once used up, nitric gases, such as NO2


, can pass through, resulting in false negative signals. This is a dangerous situation; the resulting ppm reading may be far


With the AsH3/C-1 and the AsH3/M-1 MEMBRAPOR presents two extremely highly sensitive sensors, which allow the highly toxic gas arsine to be measured in the ppb range.


Despite its past as a component in chemical weapons, Arsine is now a common technical product in the semiconductor industry. Arsine is used as a doping gas on a large scale and in signifi cant quantities in the context of thermal doping of silicon in the diffusion process and in ion implantation. To ensure safety, all processes need to be controlled and monitored with electrochemical Arsine sensors.


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Gas sensor specialists continue to improve selectivity and precision


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too low with respect to the current concentration of CO. In many applications, a fi lter has an approximate lifespan of 2 years, which is effectively the limit for critical measurement applications. Replacing the fi lter of Membrapor’s CO/VF-2000-4E can more than double the lifetime of the sensor.


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Swiss gas sensor specialists Membrapor strive continuously to improve the selectivity of their sensors to provide even more accurate, selective and safe measurements. This year has been no exception and several enhancements have already come to fruition.


Membrapor upgraded their CH2O/CA-10 sensor by eliminating its cross-sensitivity to methanol. For selective measurements of formaldehyde (CH2O) concentrations in applications with aqueous CH2O solutions that contain methanol as a stabiliser (“Formalin”). Such solutions are typically used for the fi xation or preservation of biological tissue and cells.


The ETO/CA-10’s cross-sensitivity to carbon monoxide (CO) has been reduced. For selective measurements of ethylene oxide (ETO) concentrations in applications where small amounts of CO, possibly due to vehicle traffi c, are present. ETO gas is widely used as a sterilisation agent for a wide range of applications.


Membrapor also launched the AsH3/C-1 and the AsH3/M-1 sensors - two extremely sensitive sensors, which enable the highly toxic gas arsine to be measured in the ppb range. They also designed a gas cap for their compact sensors (7-series). The cap can be used with Membrapor’s digital or analogue electronics as pre-calibrated units.


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