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British Shore SHAW Dew Point Meter - Impact of Environmental Conditions on Humidity Measurement
Petroleum, chemical, meteorological, environmental, defense, scientific research, aerospace and other departments often need to measure and control the environmental humidity. The control of ambient temperature and humidity and the monitoring and analysis of the moisture value of industrial materials have become one of the more common technical conditions, but in the conventional environmental parameters, humidity is one of the most difficult parameters to measure accurately. This is because measuring humidity is much more complicated than measuring temperature, temperature is measured independently, and humidity is affected by other factors (atmospheric pressure, temperature). In addition, the calibration of humidity is also a problem.
I. Humidity Definition <br> In the measurement method, humidity is defined as the "amount of object state". The humidity referred to in daily life is relative humidity, expressed as RH%. In summary, the percentage of the amount of water vapor (water vapor pressure) in a gas (usually in air) and the amount of saturated water vapor (saturated water vapor pressure) in the same condition as air.
The less water vapor is contained in a certain volume of air at a certain temperature, the more dry the air; the more water vapor, the more humid the air. The degree of dryness and humidity of the air is called "humidity". In this sense, the physical quantity such as absolute humidity, relative humidity, comparative humidity, mixing ratio, saturation difference, and dew point is commonly used; if the weight of water vapor in wet steam is a percentage of the total weight (volume) of steam, it is called For the humidity of the steam. The humidity that the human body feels comfortable is: the relative humidity is less than 70%.
British Shore SHAW Dew Point Meter - Impact of Environmental Conditions on Humidity Measurement
Second, the impact of environmental conditions on humidity measurement
Environmental conditions have a significant impact on humidity and dew point measurements. To achieve the best measurement results, the following environmental factors need to be considered:
Select a representative measurement location
Always choose the location that represents the environment being measured as a measurement point, avoiding hot spots and cold spots. Transmitters installed near doors, heaters, or air intakes may experience rapid humidity changes and are not stable enough.
Since the relative humidity has a strong dependence on temperature, it is important to have the humidity sensor at the same temperature as the air or gas being measured. Maintaining the thermal balance between the meter, the sensor, and the gas being measured is especially critical when comparing the humidity readings of two different meters. Unlike relative humidity, dew point measurement has nothing to do with temperature. However, pressure conditions must be considered when measuring the dew point. According to the specific working conditions, you can choose British Shore's online split dew point meter SUPER-DEW3, or British Shore's online integrated dew point meter SDA.
Pay attention to the temperature difference problem
When installing the humidity sensor in place, avoid temperature drops along the length of the sensor. When there is a large temperature difference between the sensor and the external environment, the entire sensor body should be installed inside the process environment, and the cable entry point should be insulated.
In the event of possible condensation, the sensor should be mounted horizontally to avoid water droplets on the sensor/cable and to saturate the filter. Make sure that the air around the sensor can flow. The free flow of air ensures that the sensor is in balance with the process temperature. At a temperature of 20 ° C and a relative humidity of 50% RH, a temperature difference of 1 ° C between the sensor and the measurement zone results in a measurement error of 3% RH. At a relative humidity of 100% RH, the error is 6% RH.
We define the environment with relative humidity >90% RH as the higher humidity environment. When the relative humidity is 90% RH, the difference of 2 °C can cause water condensation on the sensor, which may take several hours in poorly ventilated space. In order to restore it to dryness. The British Shore dew point sensor recovers from condensation. If the condensate has been contaminated, contaminant deposits will appear on the sensor, which will affect the meter's measurement accuracy. This situation can even shorten the life of the sensor.
British Shore SHAW Dew Point Meter - Impact of Environmental Conditions on Humidity Measurement
Continuous exposure to extreme temperatures can have an impact on sensor and probe materials, so choosing the right product for a demanding environment is critical. When the temperature is above 60 degrees, the transmitter electronics should be installed outside the process environment and the appropriate sampling point should be selected. When measuring the relative humidity under the process conditions similar to the ambient pressure, a small amount of leakage is acceptable, and the leak around the probe or cable perimeter can be reduced.
British Shore SHAW dew point meter - the impact of environmental conditions on humidity measurement, more information on the British Shore dew point meter, please visit the official website of Ying Xiao Instrument (Shanghai) Co., Ltd. http://, or To, 17317068376 consultation.
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