And measuring weight, temperature, temperature hygrometershould first affirm its measuring range (-25 ~ 120 ℃). In addition to climate, scientific research department, engage in temperature,humidity control general wet process (0-98%RH) measurement.

The selection of measurement precision

The measurement accuracy is an important index of purchasingtemperature hygrometer, instrument using different sensoraccuracy, will cause the different production costs, an inlet sensorgood some cost up to several thousand, some products usingdomestic sensors need only a few cents, so also cause equipment sales prices are poles apart. For example, customers need totemperature and humidity to buy a thermometer and hygrometeras household certainly does not need to buy industrial levelmeter. So users must act according to actual circumstances,should not blindly pursue "high, fine, sharp".

The test filter drift and Wen Piao

In practical application, because of the influence of dust, dirt and harmful gas, used for a long time, temperature and humiditysensors will produce the aging, precision landing, but the generalindustrial sensor over its useful life of one year does not exceed 0.3 ℃, but domestic sensor because of its brand clutter, relatively low prices, may drift can reach 3-5 ℃, all in the selection oftemperature and humidity meter should consider the temperature and humidity sensor temperature drift.

The installation environment

Temperature hygrometer is should try to prevent the use ofcontaining organic solvent in acidic, alkaline and atmosphere, but also to prevent the use of the environment in the larger dust.