FAQ

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Why do MIPEX infrared gas sensors have so low power consumption?


Ultra-small incandescent lamps with low efficiency coefficient are used as the emission source in standard infrared sensors. Patented and produced by Optosense LED type infrared emission sources are used in MIPEX innovative gas sensors. Their efficiency of power transformation into infrared emission of the required spectrum range of the waves in the mode of ultra-short pulses of LED operation is several times higher. Moreover, the sensors comprise optimized optic scheme, highly-sensitive photodetector (up to 10 times more sensitive than pyroelectric detector), special algorithms of signals processing and other know-how, providing optimal operation of the sensors at low power consumption.


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How does humidity influence the operation of MIPEX infrared gas sensors?


Patented design and spectral measurement circuit, providing minimal impact of moisture on measurement result, are applied in MIPEX infrared gas sensors. The impact of moisture meets the requirements of IEC 60079-29-1. However, it should be mentioned that MIPEX sensor, as any other gas sensor, is sensitive to condensed moisture influencing accuracy of measurements till evaporation of liquid from optical surfaces.


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What happens to the sensor at sudden temperature change, when, for example, the device with MIPEX sensor is brought into the warm room from the frost environment?


Temperature compensation mechanism is provided in MIPEX infrared gas sensor. At rapid temperature change due to various reaction rates of separate components of the sensor, this mechanism can work out such changes not so correctly. At that time the sensor is in status which indicates rapid temperature change and consequently possible unreliability of readings. At rapid temperature change and upon high humidity conditions, condensate formation on the sensor optical surfaces is possible. In this case the unreliable reading may occur till the surfaces become dry


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How does gas pressure influence readings of MIPEX sensor?


The sensor measures partial pressure. Sensor readings are directly proportional to pressure. For example, at the pressure equal to 1 atm, the sensor readings are 2.0% vol. Thus, when the pressure of the same gas mixture increases to 1.1 atm, the sensor readings will be 2.2% vol.


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Is it necessary to calibrate MIPEX infrared gas sensor following its installation in the equipment?


Calibration of MIPEX infrared gas sensor consists of two stages: zero setting and scale (scale coefficient) setting. Calibration of the sensor is required at primary installation in gas analyzer as well as during preparation for the equipment check.


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In what cases zero setting is required?


Zero setting should be performed after long-term storage without power supply, as well as after transportation and filter installation.


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How often is the installation of sensor scale by calibration gas mixture required?


Scale setting of MIPEX infrared gas sensor should be performed not often than once in 36 months.


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Why is zero setting necessary after long-term storage without power supply, as well as after transportation, installation in the equipment and in the filter sensor?


After installation of the filter and installation of the sensor in the equipment, due to additional reflections, the distribution of light stream inside the sensor can be changed, resulting in changing of signals ratio and as a consequence zero change. Due to the shock impact, changes in optical picture can be occurred after transportation. By the force of natural processes during the long-term storage, the signals ration in channels can be changed. During sensor operation, such changes are considered by means of zero automatic correction algorithm.


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Is it necessary to use the replaceable dust filter?


Without application of dust filter, the sensor optical surfaces may become dirty. Upon large dirty, the optical channels may become lower the minimal threshold value. If the gas analyzer is already equipped with the filter, it is not necessary to use the replaceable filter, because installation of the additional filter influences sensor response.


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Is it possible to perform self-calibration of MIPEX sensor for other gas, for example for methane (СН4) or propane (С3Н8) sensor?


During factory calibration the sensor memory is filled with the data of polynominal linearization of the points in full range. The polynoms of methane and propane are differing from each other. In order to perform sensor re-calibration for other gas, it is necessary to save the data of corresponding polynom in the sensor memory. User calibration is performed by 2 points which is not sufficient for building of the polynom.


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Is it possible to connect directly MIPEX-03 infrared gas sensor with analog output to pellistor circuit?


It is not recommended to connect directly MIPEX-03 gas sensor with analog output to pellistor circuit because upon such connection loss in voltage can be more than 5 V resulting in sensor failure with loss of its further function. The intrinsic safe circuit should be used for proper connection of MIPEX-03 sensor with analog output. Example of connection of MIPEX-03 infrared gas sensor with analog output to intrinsic safe circuit “ia” is provided in "Resources" section.




Семейства продуктов MIPEX

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MIPEX-04
MIPEX-03
MIPEX-03
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