Vaisala Humicap®Technology
Until the early 1970s, hair hygrometers were common and at that time, reliable humidity measurement was an unresolved challenge. To solve this, Vaisala began developing a new type of humidity sensor using semiconductors and thin-film materials.
在1973, Vaisala introduced HUMICAP®, the world’s first thin-film capacitive humidity sensor at CIMO VI congress. HUMICAP was a radical innovation that changed humidity measurements for good. The new technology was groundbreaking: the sensor had no moving parts, and due to the advanced use ofsemiconductorand thin-film technologies, it was amazingly small. Since then, Vaisala has become the market leader in relative humidity measurements, and thin-film capacitive humidity sensors have developed from one company’s innovation into a global industry standard.
How it works
HUMICAP is a capacitive thin-film polymer sensor consisting of a substrate on which a thin film of polymer is deposited between two conductive electrodes. The sensing surface is coated with a porous metal electrode to protect it from contamination and exposure to condensation. The substrate is typically glass or ceramic. The thin-film polymer either absorbs or releases water vapor as therelative humidityof the ambient air rises or falls. The dielectric properties of the polymer film depend on the amount of absorbed water. As the relative humidity around the sensor changes, the dielectric properties of the polymer film change, and so does the capacitance of the sensor. The instrument’s electronics measure the capacitance of the sensor and convert it into a humidity reading.
Typical applications for humidity measurement
Vaisala带有腐殖质传感器的湿度仪器适合广泛的应用。从电力和钢铁到生命科学和建筑自动化，许多行业都需要测量湿度 - 这里只是一些：必须在许多干燥过程中测量和控制湿度，例如建筑材料和纸张制造中的湿度以及流体床烘干机。过程空气的湿度是干燥过程进展的良好指标。
Cleanrooms和其他关键环境还需要高性能的环境测量，以便在规格内稳定运行。此外，手套箱和隔离器– used for handling moisture or gas-sensitive materials – benefit from accurate and reliable humidity measurements. Measuring humidity in a critical environment can be especially challenging. In the food industry干衣机andovens used in bread baking谷物生产需要精心控制的湿度水平，以保持一致的质量和高产，并为成品提供独特的特征。在建筑自动化，，，，optimizing both the temperature and relative humidity of the indoor environment enables a greater level of comfort for occupants than optimizing temperature alone. Careful humidity control is a must inmuseums and archives，，，，warehouses，，，，and other environments where humidity-sensitive materials are stored.
Vaisala Humicap湿度产品
尽管Humicap创新最初是为一种新型的辐射设计而设计的，但最大的兴趣来自其他地方：在各种环境中工作的人。对可靠的湿度测量的需求是所有人共有的，并且可以准确地做到这一点的工具是很少有之间。
Today we offer everything you need for测量湿度，，，，with a wide range of humidity instruments covering applications from HVAC to the most demanding industrial applications, both indoors and outdoors, and alsobepaly官网
。Vaisala’s humidity instrument offering includes transmitters, modules for volume applications, portable and handheld humidity meters, and humidity calibrators.
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| HUMICAP’s unique benefits |
|---|
| Excellent long-term stability |
| 在sensitive to dust and most chemicals |
| Chemical purge option for stable measurements in environments with high concentrations of chemicals |
| Sensor heating for measurements even in condensing environments |
| Full recovery from condensation |
