When it comes to gas sensing, there is no room for error, which is why Angst+Pfister Sensors and Power sells and manufactures only superior gas sensors and OEM gas sensor, modules built for the most demanding applications.
Our gas sensors and gas sensor modules, including those from Smart Gas and SGX Sensortech, as well as Angst+Pfister Sensors and Power’s own gas sensors and gas sensor modules, are the ideal choice for a wide variety of uses, including uses in the food industry, bio-incubators and in medical respiratory applications. In the field of safety (industrial), Angst+Pfister Sensors and Power has a near-complete range of gas sensors and gas sensor modules with a focus on oxygen, carbondioxide and combustible gases.
The Fujikura FCX-UC zirconia oxygen gas sensor and innovative products, such as the MP-7217-TC sensors from SGX Sensortech, are examples of gas sensors for the measurement and control of gas content in safety applications. We support you during your design phase in the development of new and individual gas sensor modules. Our range includes proven, high quality products, such as the zirconia-based FCX-MC25 oxygen gas sensor module from Angst+Pfister Sensors and Power, and innovative products, such as the MiCS-VZ-86/89 VOC gas sensor module (CO2 equivalent) from SGX Sensortech. The MiCS-VZ-86/89 gas sensor module and other sensors are used, for example, in HVAC applications to measure and control air quality.
Industrial gas sensors, generally speaking, are used to monitor and control levels of gases that are either poisonous or flammable, but it can also be gases that need to be monitored, because they have an impact on the earth´s eco system. The latter are for instance gases with a high global warning potential (GWP) used in various industrial applications such as, but not limited to, oil & gas exploration and refrigeration. The gas with the highest GWP overall is SF6, which is used mainly in high power, gas insultation switches (GIS). SF6 has a GWP of ~ 22.000 over CO2, and for that reason it is obvious that leakage or emission in general from GIS installations cannot be tolerated. Transmission of power, on the other hand, is a necessity in any country across the world, and therefore GIS installations are necessary, meaning that SF6 leaking or emitting from all GIS installation must be monitored and eliminated/minimized. There are alternatives to SF6, and these alternatives are being vigorously pursued, but the SF6 based GIS installations will remain for many years to come. SF6 detectors based on infrared absorption (NDIR) are available from Angst+Pfister Sensors and Power in ranges from 0 to 1000 ppm and up to 0 to 100% SF6.
SF6 is a poisonous gas, but it is not considered among the most poisonous industrial gases around. The degradation products (in free air) of SF6, SO2 and HF, are much more poisonous and they can cause severe health problems even by low- and sub-ppm exposure. HF (hydrogen fluoride) gas is a likely degradation product for most fluorinated chemicals, but is also a gas that can emit directly from a chemical process, like in a semiconductor fab. HF has an odor, but only above 0.5-3.0 ppm, and since the threshold limit values (TLV) are low – 3 ppm TWA and up to 6 ppm ceiling – HF must be monitored in applications, where there is potential risk of HF generation and emission. Angst+Pfister Sensors and Power has in their product portfolio very reliable HF gas sensing modules that can be used to monitor sub-ppm levels of HF. Generally, Angst+Pfister Sensors and Power has in their product portfolio, gas sensing solutions for most poisonous gases like SO2, H2S, HCN and so on. Most of the gas sensing modules for poisonous gases are electrochemical (EC) type of sensors. Angst+Pfister Sensors and Power has the newest technology in their product program, namely the so-called solid polymer embedded electrolyte (SPE) ECs, that has a good stability, very low drift and long lifetime.
GWP management, coupled with a potential of emitting poisonous gases from small gas leaks and the risk of fire braking out from large gas leaks, is a central problem to solve for manufacturers of heat pumps, cooling machines and large, cooled motors and engines. The most efficient refrigerant gases, like for instance R134a and R410a, are being soon to be banned from new installations, because of their high GWP. There are alternatives with a much lower GWP, like R32 and R1234yf, but they are both flammable and one degradation product during burning is HF (poisonous). For the new refrigerants, there is therefore a need to monitor both small and large leaks from a pressurized tank. Angst+Pfister Sensors and Power has gas sensor modules in their product program that can be used to monitor small leaks in the ppm and to monitor large leaks in the lower explosion limit (LEL) range of flammable R32 or R1234yf gas.
LEL range of gas sensors for monitoring the concentration of flammable hydrocarbon gases is another specialty of Angst+Pfister Sensors and Power. We have gas sensor products in our program based on infrared absorption (NDIR), catalytic controlled burning (CT) or thermal conductivity (TC). Most sensors are ATEX approved. New in our program are the MEMS type of CTs and TCs that can be used for low power, hand-held operated gas safety devices. Most of the sensors are protected against poisoning from silicones and sulfur based gases and have a long operational lifetime.