Chilled mirror type high precision dew point meter

Chilled mirror type high precision dew point meter (MICHELL-S8000S)

Overview

MICHELL S8000S Chilled Mirror High Precision Dew Point Meter is the latest product developed by Michell. Its basic and automatic chilled mirror dew point principle provides high precision and drift-free reliable measurement for industrial process and calibration applications.

Gases with different moisture content will condense on the mirror surface at different temperatures. Using photoelectric detection technology, the exposed layer is detected and the temperature when dew condensation is measured, and the dew point is directly displayed. The methods of mirror cooling include semiconductor refrigeration, liquid nitrogen refrigeration and high-pressure air refrigeration. The chilled mirror dew point meter adopts the direct measurement method. Under the premise of ensuring accurate dew detection, high efficiency of mirror cooling and precise measurement of condensation temperature, this dew point meter can be used as a standard dew point meter. At present, the highest precision in the world is ±0.1℃ (dew point temperature), a certain gas humidity corresponds to a dew point temperature; a dew point temperature corresponds to a certain gas humidity. Therefore, by measuring the dew point temperature of the gas, the humidity of the gas can be measured. The absolute humidity can be obtained from the dew point, and the relative humidity of the gas can be obtained from the dew point and the temperature of the measured gas. The value directly given by the dew point meter is the dew point temperature, which should be exactly "thermodynamic dew point temperature". The definition adopted by the World Meteorological Organization is the thermodynamic dew point temperature Td of moist air with a pressure P and a mixing ratio r, which refers to the temperature at which the moist air is saturated with water at a given pressure.

At this temperature, the saturated mixing ratio rw of moist air is equal to the given mixing ratio r. The working principle of the photoelectric dew point meter can be simply described as follows: the gas to be tested sweeps across the smooth metal mirror cooled with cold nitrogen at a constant pressure at a certain flow rate. As the temperature gradually decreases, when the mirror reaches a certain temperature Condensation (or frost) begins, and the mirror temperature at this time is the dew point temperature. The instrument measures the dew point temperature Td through the optical system, temperature measurement circuit, logic control circuit, digital display circuit, etc., and displays it. At present, China National Metrology Institute, Shanghai, Guangdong, Liaoning, Shaanxi, Xinjiang, Shenzhen, Foshan, Chinese Academy of Sciences and other provincial and municipal metrology institutions all use Michell chilled mirror dew point meter as the measurement standard of temperature and humidity dew point!

Applications

A. Laboratory reference standards;

B. On-site micro-water detection of high-voltage switch;

C. Monitoring of key points in other industrial gas processes;

F. Laboratory measurement standard dew point meter specially designed for university laboratories, factory measurement centers, scientific research institutes, and national measurement institutions.

Features

A. The use of dual optical path system has excellent sensitivity and automatic compensation for changing gas temperature;

B. The hinged sensor chamber makes monitoring and cleaning of the mirror very easy;

C. Multiple unit display: °Cdp; °Fdp; ppm(v); %rh

D. 2℃/sec fast measurement response;

E. The pressure can withstand up to 20bara;

F. Data collection of humidity, pressure and flow through SD card and USB interface;

G. High-resolution LCD screen, menu structure is easy to operate;

H. Multi-language optional;

I. The mirror is made of gold-plated brass;

J. An endoscope is optional when purchasing, which can easily see the formation of frost/dew on the mirror.

Technical parameter

*Measurement accuracy refers to the maximum deviation between the instrument to be tested and the corrected standard. This parameter must take into account the uncertainty introduced by the calibration system, as well as the influence of environmental factors during testing or use.

Service Guarantee

• Provide on-site training guidance and conduct on-site demonstration operations.
• Provide detailed Chinese manual and user guide.
• One year free warranty, lifetime spare parts support and maintenance.
• The hotline is available 365 days a day to answer user inquiries.