DHM2 mechanical ventilation wet and dry watch use and installation

DHM2 mechanical ventilation wet and dry table use and installation:

Before use, first set the skim sleeve on the right thermometer of the right position. The yarn sleeve installation method: the yarn sleeve is cut to a length of about 25 mm, and the lower end is bundled with a cotton wool thread, and is placed on the ball portion of the wet bulb temperature meter. In order to prevent falling off, the upper end of the yarn sleeve is bundled on the concave surface of the glass tube above the bulb portion of the thermometer. Where. When using a ventilated wet and dry watch, the ventilated wet and dry watch should be hung, and the place where the ventilation and dry humidity are hung should be ensured that the obstacle around the instrument is at least 0.5 m away from the bulb of the thermometer. This is to prevent the thermal radiation of the obstacle itself from affecting the measured value of the thermometer. After the ventilated wet and dry watch is hung, the wet sleeve of the wet bulb thermometer should be wetted with distilled water, then the ventilator spring should be tightened, etc. After the ventilator has been turned for four minutes, the dry bulb and wet bulb thermometer readings are performed. The reading is corrected by the thermometer, and the relative humidity of the air is checked in the humidity checklist (the weather table) according to the corrected dry bulb temperature and wet bulb temperature. When used in the field, if the wind speed in the field is greater than 3m/s, a windshield should be placed on the windward surface of the ventilator to prevent the wind speed in the field from affecting the airflow speed of the ventilator.

DHM2 mechanical ventilation dry and wet table technical parameters:

1. When measuring the relative humidity of air, it can work normally in the environment of -10 to +45 °C.

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

3. The scale and measurement range of the thermometer: -36 ~ +46 °C or -26 ~ +51 °C.

4. Ventilation speed The ventilation speed of the ball position of the thermometer after the ventilator is started shall not be less than 2.5m/s at the end of the 4th minute, not less than 2.2m/s at the end of the 6th minute, and ventilation per minute before the end of the 6th minute. The amount of change in speed should not exceed 0.2 m/s.

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

DHM2 mechanical ventilation wet and dry table principle:

The working principle of the mechanical ventilated wet and dry watch is to fill the ventilator's spring, so that the fan rotates to give a certain speed of air flow, flowing through two side-by-side thermometers, one of which is wrapped with mercury balls. Skim gauze. The temperature of the thermometer is lowered due to evaporation of moisture on the gauze. Comparing the temperature difference between the two thermometers (wet and non-wet), the relative humidity and absolute humidity of the air can be obtained by looking up the table.

After-sales commitment:

The instrument is guaranteed for one year from the date of purchase (except for consumable consumables). If the glass consumables are damaged during shipment, the company will bear the responsibility. If the goods are received for three days, no objection is considered as qualified acceptance. Anyone who purchases any of our products will provide technical guidance and after-sales maintenance for life. Shanghai Longtuo Instrument Equipment Co., Ltd. adheres to the tenet of "Serving customers wholeheartedly", always puts the interests of users first, provides high-quality products and services, and treats every customer with care.