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Gas sensor WB-MSGR/en: различия между версиями
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When the concentration of a certain gas changes, the resistance of the semiconductor sensing element ('''SE''') of the Rs sensor changes. The measurements use the ratio of the resistance of the SE Rs to the resistance measured in the reference medium Rs0. As the concentration of gases to which the sensor is sensitive increases, the SE resistance decreases, respectively, the Rs/Rs0 Ratio decreases. Based on the value of the Rs/Rs0 ratio, a decision can be made to turn on the warning signal. For different gases, the same RS/Rs0 ratio corresponds to different concentrations of these gases in the environment. | When the concentration of a certain gas changes, the resistance of the semiconductor sensing element ('''SE''') of the Rs sensor changes. The measurements use the ratio of the resistance of the SE Rs to the resistance measured in the reference medium Rs0. As the concentration of gases to which the sensor is sensitive increases, the SE resistance decreases, respectively, the Rs/Rs0 Ratio decreases. Based on the value of the Rs/Rs0 ratio, a decision can be made to turn on the warning signal. For different gases, the same RS/Rs0 ratio corresponds to different concentrations of these gases in the environment. | ||
There is a heater inside the sensor, which is constantly switched on, which makes it possible to measure the concentration of gases. If the sensor remained de-energized for a long time, then the output to the operating mode will require some time: from two days, if the sensor was not turned on for a month, to a week, if the sensor was not turned on for more than six months. Operation in an aggressive environment leads to degradation of SE, ice and condensate reduce its sensitivity. | |||
There is a heater inside the sensor, which is constantly switched on, which makes it possible to measure the concentration of gases. If the sensor remained de-energized for a long time, then the output to the operating mode will require some time: from two days, if the sensor was not turned on for a month, to a week, if the sensor was not turned on for more than six months. Operation in an aggressive environment leads to degradation of SE, ice and condensate reduce its sensitivity. | |||
Temperature and humidity also affect the resistance of the sensing element: it drops with increasing temperature and humidity. | Temperature and humidity also affect the resistance of the sensing element: it drops with increasing temperature and humidity. | ||
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Before setting up the sensor, wait for the SE to enter the operating mode. The operating mode stabilizes the resistance of the SE under constant ambient conditions — under which the sensor will be constantly operated. | Before setting up the sensor, wait for the SE to enter the operating mode. The operating mode stabilizes the resistance of the SE under constant ambient conditions — under which the sensor will be constantly operated. | ||
The value of Rs0 depends on the type of sensor and can vary from one instance to another, so it is initially possible to set the value of Rs0 equal to the resistance after entering the operating mode. | The value of Rs0 depends on the type of sensor and can vary from one instance to another, so it is initially possible to set the value of Rs0 equal to the resistance after entering the operating mode. | ||
==== Automatic relay control ==== | ==== Automatic relay control ==== | ||
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For correct operation, the parameters "Rs ratio", "High threshold" and "Low threshold" must have values other than zero. | For correct operation, the parameters "Rs ratio", "High threshold" and "Low threshold" must have values other than zero. | ||
=== Web-based management === | === Web-based management === | ||
[[File:WB-MSGR-web.png |300px|thumb|right| WB-MSGR sensor in web interface]] | [[File:WB-MSGR-web.png |300px|thumb|right| WB-MSGR sensor in web interface]] | ||
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