Electric ventilation dry wet gauge HM-3A Asman dry wet bulb thermometer

Electric ventilation dry wet gauge HM-3A Asman dry wet bulb thermometer、Product Overview:

Electric ventilation hygrometer is used to measure the temperature and relative humidity of air, and is suitable for measuring the temperature and relative humidity of air in laboratories with power supply.

2、 Structure and working principle:

The electric ventilation psychrometer mainly consists of a temperature gauge frame (2) and a ventilator (1). Two identical glass sleeve precision mercury thermometers (3) are installed on the temperature gauge frame, one as a dry bulb thermometer and the other as a wet bulb thermometer. In order to avoid the influence of sunlight and thermal radiation, the bulb of the thermometer is covered with a double-layer protective tube (4) and (5), and the outer surface of the protective tube should be bright to reflect thermal radiation. The ventilation system consists of a ventilator (1), a central duct (6), a tee (7), and temperature gauge protective tubes (4) and (5). As the energy stored in the tightly wound spring gradually releases, it drives the wind turbine wheel to move, creating a stable airflow at the ball of the temperature gauge and ensuring that the measured value of the temperature gauge is more representative.

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3、 Basic technical parameters:

1. When measuring relative humidity of the air, it can operate in an environment of -10~+45 ℃

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2. Relative humidity measurement range: 10-100%.

3. The scale and measurement range of the thermometer are -36~+46 ℃ or -26~+51 ℃.

4. The ventilation speed at the bulb position of the temperature gauge after the ventilator is turned on shall not be less than the ventilation speed at the end of the 4th minute

At 2.5m/s, the ventilation speed should not be less than 2.2m/s at the end of the 6th minute, and the change in ventilation speed per minute before the end of the 6th minute should not exceed 0.2m/s.

5. The total operating time of the ventilator shall not be less than 9 minutes.

4、 Installation and use:

Before use, first put a degreasing yarn cover on the right thermometer ball in the front view position. Installation method of yarn cover: Cut the yarn cover to a length of about 25mm, tie the lower end with degreased cotton thread, and cover it on the wet bulb thermometer ball part. To prevent it from falling off, tie the upper end of the yarn cover to the concave circle of the glass tube above the thermometer ball part.

When using a dry electric ventilated hygrometer, it should be hung properly. The place where the ventilated hygrometer is hung should ensure that the obstacles around the instrument are at least 0.5m away from the bulb of the thermometer. This is to avoid the thermal radiation of the obstacles themselves affecting the measurement value of the thermometer. After hanging the ventilated hygrometer, the yarn cover of the wet bulb thermometer should be moistened with distilled water first, and then the ventilator spring should be tightened. After the ventilator rotates for four minutes, the readings of the dry bulb and wet bulb thermometers should be taken. And the readings will be corrected for temperature difference using a thermometer. Based on the corrected dry bulb temperature and wet bulb temperature, the relative humidity of the air will be calculated in the humidity lookup table (commonly used meteorological table). When used in the wild, if the wind speed is greater than 3m/s, a windproof cover should be placed on the windward side of the ventilator to prevent the outdoor wind speed from affecting the airflow speed of the ventilator,

5、 Storage, packaging, and transportation:

Electric ventilation hygrometers should be stored indoors at -10~+40 ℃ and with a relative humidity greater than 80%! There must be corrosive volatile substances. Strictly follow the requirements of internal and external packaging, do not invert, do not get damp, and handle with care during transportation.Electric ventilation dry wet gauge HM-3A Asman dry wet bulb thermometer