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Home All Products Process Analysis Systems Engineering > 373 Dew Point Humidity Meter
The cold mirror humidity measurement method is a method used to measure the dew point or frost point of gases, and its working principle is as follows. The light shines onto the polished mirror surface, and the temperature of the mirror surface is controlled by a thermoelectric heat pump, also known as a Peltier element.
The cold mirror humidity measurement method is a method used to measure the dew point or frost point of gases, and its working principle is as follows. The light shines onto the polished mirror surface, and the temperature of the mirror surface is controlled by a thermoelectric heat pump, also known as a Peltier element. The photosensitive receiver measures the intensity of direct reflection. When the mirror surface is clean and dry, the intensity of reflected light reaches its maximum value. On the contrary, a cold mirror with condensed water vapor on its surface will scatter light, resulting in a decrease in directly reflected light and a decrease in signal intensity. By using the received light signal as feedback for the closed-loop control system, the mirror surface can be cooled to a certain temperature, and the temperature detected by the intensity of the received light keeps the thickness of the mirror condensation layer constant. A constant thickness condensed water layer, with no further net increase or decrease in condensed water, is in dynamic equilibrium with the gas around the mirror. Under this equilibrium condition, the dew point or frost point temperature of the gas is determined by measuring the temperature of the mirror surface. If it is known that the condensate is in liquid form, even at temperatures below the frost point, the measured mirror temperature should be used as the dew point. If it is known that condensed water exists in solid form as ice or frost, the measured mirror temperature will be used as the frost point.
Online dew point meters can accurately measure the dew point temperature of air or other gases. This series of dew point meters has the advantages of high accuracy, wide applicability, and low cost. They are suitable for steel, petrochemical, oven, drying oven, environmental testing, calibration laboratory, paint booth, process gas monitoring and gas production fields, using the principle of spotlight measurement to ensure high accuracy and reliability.
Due to different cooling methods and detection control methods, online dew point meters can be divided into multiple types. Its calibration uses a thermoelectric cooler to cool the dew point sensor, so that the water vapor in the sample gas condenses on the dew point sensor; The signal collected by the receiver is automatically controlled by a circuit to maintain equilibrium between the dew point on the dew point sensor and the water vapor in the gas. Accurately measure the temperature of the dew point sensor using a platinum resistance thermometer to obtain the dew point temperature of the gas.
A gas metering system is defined as a transfer in which a fluid or gas is measured and sold from one direction to another. In the process of trade handover, accuracy is crucial for both the company delivering the materials and the ultimate recipient when transmitting them. CTM is defined as an instrument designed, installed, and operated to meet the requirements of trade handover measurement. Trade handover requires a complete metering system designed and manufactured for measuring product gas applications, not just flow meters.
Online dew point meters can accurately measure the dew point temperature of air or other gases. This series of dew point meters has the advantages of high accuracy, wide applicability, and low cost. They are suitable for steel, petrochemical, oven, drying oven, environmental testing, calibration laboratory, paint booth, process gas monitoring and gas production fields, using the principle of spotlight measurement to ensure high accuracy and reliability.
There are various measurement methods for online dew point meters, and their performance and price are completely different. This requires caution when choosing instruments, not only considering performance and price, but also the location and measurement of the instrument. So how to choose a suitable dew point meter for natural gas pipelines?
The measurement of dew point is very important for meteorology or other industries closely related to temperature. Usually, we accurately measure it through online dew point meters. In fact, there are many different classifications to meet the needs of different occasions.
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