JPS63191952A - Humidity measuring instrument - Google Patents

Abstract

PURPOSE:To measure humidity speedily from low-temperature gas to high- temperature gas by providing two temperature sensors, and exposing one temperature sensor to a gas flow and covering the temperature sensing part of the other temperature with gauze. CONSTITUTION:One temperature sensor (dry bulb) 1 has its temperature sensing part exposed and detects the temperature of a hot blast directly and the other temperature sensor (wet bulb) 2 has its temperature sensing part covered with the gauze 3 and detects the temperature of the hot blast indirectly. Then the sensors 1 and 2 are connected to an interface 8, which is further coupled with an arithmetic means (e.g. personal computer) 9, which finds the humidity of high-temperature gas from the measured values of the sensors 1 and 2. In this case, the part covering the wet bulb is 5-30mm and the remainder is sealed by using a tube body; and a supply bin 4 is provided outside the air flow, the amount of water in the supply bin 4 can be reached, and the amount of vapor at the part is adjustable, thereby measuring the humidity from low-temperature gas to high-temperature gas.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wet/dry edge hygrometer, and is particularly characterized in that it is capable of measuring the humidity of hot air of 100° C. or higher.

(Prior Art) In recent years, various types of hygrometers have been commercially available, including a wafer type, a zirconia type hygrometer using an oxygen concentration meter, and a type that measures dew point. All of these methods have been widely used because they have high accuracy and can perform continuous measurements, but on the other hand, they cannot measure humidity in dust-containing gas, cannot measure high-temperature areas, and have poor response. It has problems such as being slow, difficult to zero-adjust, and takes time to start up before use, as well as being expensive, which has hindered its widespread use. Therefore, there has been a desire for the development of a simple measuring device that can measure the humidity of high-temperature gas containing dust and the like.

(Means for Solving the Problems) The present invention improves the wet/dry edge hygrometer that has been widely used for a long time. changed to 250-30
It is designed to be able to measure the temperature of air down to about 0'C, and one of the two temperature sensors is equipped with 50 g of gauze weighing 0.02~0°2.
It is coated with a density of ~6Qg/rrf, and while supplying a constant amount of water using capillary action, the electric signals output from each sensor are calculated using a calculation means (such as a computer) to calculate the dry bulb temperature and humidity. The temperature is converted into a bulb temperature, the humidity is calculated from the surface temperature, and the humidity in the gas flow can be controlled to a predetermined humidity based on the calculation result.

(Example) The present invention will be specifically described below based on the illustrated example.

Reference numerals 1 and 2 in the figure are temperature sensors.

These constitute the main parts of the wet and dry bulb hygrometer of the present invention, and one temperature sensor (dry bulb) 1 has an exposed temperature sensing part and is designed to directly detect the temperature of hot air.
The temperature sensing part of the other temperature sensor (wet bulb) 2 is covered with gauze 3, so that the humidity of the hot air can be indirectly detected.

This wet and dry bulb hygrometer is basically the same as a conventional wet and dry bulb hygrometer that uses a mercury thermometer. water is contained therein, and this water is supplied to the tip of the gauze 3 by capillary action.
The sensor 2 then detects the temperature that has dropped due to the evaporation of this water.

Of course, this device is configured to measure the temperature of high-temperature gas, and the gauze 3 is 50 to 60 g/r.
rr density is used, and sensor 2
The other parts except for the part (5 to 30 mm) covering the pipe are sealed with a tube body 5, so that this part is not exposed to hot air.

As shown in the figure, a measuring pipe 7 is branched from the high-temperature gas flow duct 6, and a psychrometric and wet-bulb hygrometer is attached to this part. The speed should be adjusted to .5m/s or more.

The sensor 1 and the sensor 2 are connected to an interface 8, and the interface 8 is further connected to a calculation means (such as a personal computer) 9, and the humidity of the high-temperature gas is determined from the measured values of the sensor 1 and the sensor 2. ing.

By the way, there are no particular limitations on the method of calculating humidity from measured values, but in the device according to the present invention, the dry bulb temperature (TD'
Absolute humidity (HP1g/Ig) is determined from C) and wet bulb temperature (TW°C) using the basic program below.

P S =4.81.667 X 10-” X T
W″″' + 6.9 X 10-'X T W' +
1.3398 X 10-”X T W”+0.
3139 x T W + 4.58HW = 0.62X
P S ÷ (760 - P S ) P T = -5,14
984X 1O-5X T W' + 5.49316
X 10-' X T W2-0.724762 X
T W + 598.493 HP = HW - 0,25X (T D - TW) ÷ P
T (Function) A predetermined amount of water is put into the replenishment bottle 4, and the flow rate of high temperature gas in the measuring tube 7 is adjusted to 2.5 m/s or more to measure the temperature inside the tube. Then, sensor 1 directly measures the temperature of the high-temperature gas, and sensor 2 measures the temperature of the water that has reached the tip of gauze 3 due to capillary action, is heated by the high-temperature gas on the way, and has lost its latent heat of vaporization at the tip. Based on the above formula, the absolute humidity in the high temperature gas can be determined.

(Effects) As detailed above, the present invention has been widely known for a long time, and has been improved by improving the wet and dry bulb hygrometer, which was conventionally only able to measure the humidity of air whose temperature was sufficiently lower than 100°C. Adjust the flow velocity of the target high-temperature gas to 2.5 m/s or higher, and use gauze with a density of 50 to 60 g/rrr, with the part covering the wet bulb being 5 to 30 gauze, and the other parts covered with the tube. Since the replenishment bottle is sealed and installed outside the airflow, the water temperature in the replenishment bottle does not rise, so a certain amount of water can reach the wet bulb area, and the amount of evaporation in that area can be adjusted appropriately. This device can quickly measure the humidity of low-temperature gas of 100℃ or less to high-temperature gas of 200 to 250℃.It has an extremely simple structure and can be manufactured at low cost. It is suitable for measuring exhaust gas from small incinerators and dryers because it can be measured even if it contains some dust.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, and FIG. 2 is a partially enlarged longitudinal sectional view of the same. 1; Sensor 2; Sensor 3; Gauze 4; Supply bottle 5; Pipe body 6; Flow duct 7; Measuring pipe 9; Calculating means 8; Interface diagram 2 procedure correction zone 7゜March 1988 9 Days 1-10

Claims (1)

[Claims] It has two temperature sensors, one temperature sensor is exposed in the gas flow, the other temperature sensor covers the temperature sensing part with gauze, and a fixed amount is poured from a glass bottle installed outside the gas flow. A humidity measuring device that absorbs water to moisten the gauze and is equipped with a calculation means that converts electrical signals from each temperature sensor into temperature and performs calculations.