This instrument is a kind of measuring instrument of ozone concentration in the atmosphere, it is a sample by measuring the air flow through the instrument in the process of the optical platform (often called absorption chamber) of ultraviolet absorption degree to realize high stability for the design of the instrument measuring ability for a long time without repeated adjustment, and the equipment is able to work in a wide range of environmental conditions and no adverse impact on the measurement accuracy
（2）Flow of sample gas：（1.0～2）L/min；
（5）Using the environment：（20～30）℃，常压 （要保证使用环境温度和气压基本稳定不变）；
（6）External power supply：AC 220V 50Hz
（7）size：Length: 50cm wide: 43cm high: 16cm
The working principle of
The fixed amount of zero gas and the same amount of sample gas are alternately pumped into the optical platform of the instrument by a pump and sample gas acquisition system. Zero gas (reference gas) is the environmental gas after ozone removal; The sample gas is an unaltered ambient gas and ozone remains. Optical platforms are often referred to as "absorption Chambers" in which ultraviolet light (radiation) is absorbed by different components of the sample gas (i.e., ozone, which may also have unwanted background components). A stable uv source is placed at one end of the optical platform, and the level of uv radiation transmitted through the optical device is measured by uv detection at the other end of the optical platform. The intensity of ultraviolet radiation in the zero gas period (reference period) and sample gas period (measurement period) is measured alternately and continuously by a photometer. A continuous record of ozone concentration is thus obtained by sampling one or a series of "measurement pairs" of alternating reference and measurement periods in sequence.
Any changes that may be caused by short-term lamp drift are similar to "noise," but years of experience have shown that the noise is small, far less than 1% of the specified drift. If the short-term drift in the intensity of a given measurement pair is to be compensated for, this can be done through an optional optical subsystem. To this end, an alternately controlled detector (outside the optical platform and sample gas photometer) monitors the intensity of the uv lamp. Adjustment or "correction" of the short-term drift of the lamp's radiation intensity. It is not important to 'measure' the long-term drift in the intensity of the intermediate lamp (unless, of course, the lamp fails completely or its output is lower than the analyzer's truncation error). Because the self-aligning zero pair removes interference and the control subsystem works well, there is virtually no cross-drift and zero-drift in instrument readings under any conditions or on any instrument configuration. According to beal's law, the signal processing of the electronic system produces instantaneous ozone concentrations for each individual measurement pair (i.e., an update period of the instrument).
The calibration set
An important part of the instrument：
Uv light source is a mercury vapor lamp with a low-voltage cold cathode. 92% of its output is concentrated in 253.7nm, which is the wavelength at which ozone absorbs the most light intensity. Light with a wavelength shorter than 200nm is eliminated by a quartz shield, which prevents any ultraviolet light with a wavelength of 185nm from producing ozone.
The detector is a sunblind caesium telluride vacuum diode with a wide passband and a central wavelength of about 253.7nm.
(3) optical platform
The optical platform (absorption chamber) is a closed reaction chamber, which consists of: stainless steel tube and quartz window to physically separate the gas from the lamp and detector; quartz reflective lens is installed on the ******** optical module, which is used to transmit UV ultraviolet light to the detector through reflection.
At the same time, this instrument can establish a connection with the Internet of things of our company. It can use mobile phone and computer to view data anytime and anywhere, and set alarm setting through SMS and email. WeChat alarm, can also draw real-time curve, historical curve, previous detection data download