At present, the demand for humidity measurement and control in China's industrial and agricultural production is increasing. Dew point meter, as an instrument for measuring humidity, has the advantages of wide measurement range, high accuracy, and easy operation. Therefore, it is widely used as a standard instrument for humidity measurement at home and abroad. The humidity online detection that can be used for industrial and agricultural production has a wide range of applications in various fields such as metrology, meteorology, aerospace, petroleum, chemical engineering, and military engineering.
YHWSY-C mirror dew point meterMeasure dew point using the mirror condensation dew point method. Using the detection of gas dew point value as a humidity measurement standard or determining whether the moisture content of gas has an impact on the production process to ensure production safety. By adopting high-precision measurement circuits and control algorithms, the self diagnostic function of the software has been improved, which changes the disadvantages of traditional dew point meters being large and bulky. The product is small in size and light in weight. No need for humidification device. Increase testing duration and reduce gas consumption. Greatly improve the stability, service life, and measurement accuracy of the product. Its components mainly consist of an optical path section, a cooling control section, an air path section, and an electronic display section. Reasonable distribution, lightweight volume, sturdy and durable.
(1) Optical path section: The optical path detection system is mainly composed of light-emitting tubes, receiving tubes, and other devices, which can detect the real-time condensation state of the mirror surface.
(2) Refrigeration control part: composed of a mirror, a cold stack, a base, a heat pipe radiator, and a fan. The mirror is embedded in the cold surface of the cold stack, and the cold stack is embedded in the base, dissipating heat through the radiator and being cooled by the fan. Strong cooling capacity and high efficiency.
(3) Gas path section: The gas path section includes gas sampling joints, sampling tubes, stainless steel needle type regulating valves, quick plugs, measuring chambers, flow meters, exhaust pipes, etc. The sampling tubes are made of polytetrafluoroethylene tubes with an inner diameter of 3mm and a wall thickness of 1mm, ensuring measurement accuracy.
(4) Electronic display part: using TFT4.2 color LCD touch screen, real-time display of current measured dew point temperature, equilibrium process curve, flow rate, time and other information. It has functions such as alarm, self detection, historical storage and query, power and flow detection, calibration, etc.

·Measurement principle of mirror condensation dew point method
·High precision sensors are stable and reliable
·Wide measurement range with self diagnostic function
·Small size and light weight
·Historical data storage function
·Easy to operate, lifetime maintenance

picture1-1 Measurement principle

YHWSY-C mirror dew point meterUnder constant pressure, the gas is passed through a sealed chamber at a certain flow rate. When the measured gas passes through the dew point measurement chamber, it passes over a cold mirror surface. When the temperature of the mirror surface is higher than the dew point temperature of the gas, the mirror surface is in a dry state. At this time, the light emitted by the light-emitting diode shines on the mirror surface and is almost completely reflected. The photoelectric sensor senses and outputs the photoelectric signal, which is compared and amplified by the control circuit to drive the thermoelectric pump (driven by a four stage Peltier) Component composition), cooling the mirror surface. When the mirror surface temperature drops to the dew point temperature of the sample gas, the mirror surface begins to condense, the light shines on the mirror surface and diffuses, and the reflected light signal sensed by the photoelectric sensor weakens accordingly. This change is compared and amplified by the control circuit, and then the thermoelectric pump excitation is adjusted to reduce its cooling power. In this way, the dew on the cold mirror surface is in equilibrium with the water vapor in the gas through automatic control. The mirror surface temperature is sensed by a platinum resistance (PT100) temperature sensor closely below the cold mirror surface, and the mirror surface temperature (i.e. the temperature of the dew layer) is accurately measured, so as to obtain the dew point temperature of the gas. As a humidity measurement standard or to determine whether the moisture content of gas has an impact on the production process, ensuring production safety.

Front panel:

The front panel of YHWSY-C is shown in the figure:

It mainly includes the following parts:

1. Test head: Rotate the compression cover on the test head counterclockwise to open the test head. The internal test head can be removed, and the test probe is equipped with a light-emitting tube and a receiving tube. The cold mirror is located in the center of the measurement chamber, making it easy to disassemble and clean.

2. Air inlet: The air inlet of the instrument is a fixed part of the quick connector, which matches with the movable part of the quick connector for easy insertion and removal. It is connected to the equipment through an air path connecting pipe.

3. Color LCD Touch Screen: Adopting TFT4.2 color LCD touch screen, with function keys and display on it, it displays real-time measured dew point temperature, equilibrium process curve, flow rate, time and other information. Easy and simple to operate.

4. Light intensity adjustment knob: Turning the knob clockwise can enhance the photoelectric signal, adjust the strength of the light intensity, and make the sensor work in the optimal state for easy observation and reducing errors.