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The dew-point sensor type

2021-01-06

JVTIA

257

Semiconductor dew-point sensor: each water molecule has its natural frequency, vibration when it entered the gap of semiconductor crystal lattice, and are motivated by the charge of lattice produce resonance, the resonance frequency is proportional to the number of moles of water. Water molecule resonance can make semiconductor junction release free electrons, so that increase the conductivity of the lattice, impedance decreases. Using this feature the dew-point meter can detect - semiconductor Trace water dew point of 100 ℃.

crystal concussion: dew point sensor using the characteristics of crystal oscillation frequency change after wet grain can design crystal oscillation type. This is a relatively new technology, it is not very mature stage. Related products abroad, but poor precision and the cost is very high.

electro-dialysis grain: using phosphorus pentoxide materials such as moisture absorption after decomposed into polar molecules, as to the characteristics of the accumulated charge on the electrode, designed based on the absolute moisture content on the system of units of micro electrolysis water meter. The highest accuracy reached plus or minus 10 ℃ (on the current international Dew point temperature) , the general precision can reach within + / - 3 ℃.

electricity sensor type grain, using hydrophilic or hydrophobic materials as a medium, or resistance, after the water of the gas flowing through the dielectric constant and conductivity change accordingly, to measure the capacitance value or resistance value, can know the time of the gas water content. Built on dew point system design of the sensor, make up the electricity sensor type dew point analyzer. The highest accuracy reached plus or minus 10 ℃ (on the current international Dew point temperature) , the general precision can reach within + / - 3 ℃.

more high-quality sensors at https://www. rtdcn。 Com /

key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor

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