1.adopts the fluorescence spectroscopy principle 2.quick, effective and easy data collection

Applications

Model TH-2002 UV fluorescence method SO2 analyzer, which is one of the high technology

products of ambient air automatic monitoring, adopts the fluorescence spectroscopy principle,

applies the modern technology of micro-SCM to detect and control signals, processes signal

data and etc. It uses optics, mechanism, electron, photochemistry and modern sensor technology 

synthetically which can continuous monitor the concentration of  the SO2 in ambient.

 Operation Principle: Zinc lamp can emit ultraviolet light, which is filtered and becomes monochromatic light (wavelength is 214nm) which then focus on the SO2 reaction chamber. Sample SO2 which absorbs ultraviolet light can make energy level transition, so SO2 becomes ground state into excitation state. The SO2 in excitation state is not stable and emits fluorescence with 330nm centre wavelength. The degree of the fluorescence light is directly related to SO2 concentration. The optical signal is changed into electric signal by PMT, through which SO2 concentration is measured. To avoid error made by fluctuation of light path, where there is two paths monitoring, the one is fluorescence intensity which is excited by light path measuring of sample gas, the other is reference light path to monitor the change of Zinc lamp light source and make auto-compensation to the change of light source.

  Features

auto alarm indicator facilitates fault determination and decreases failure rate.Modular design is easy for daily maintenance and repair.Quick, effective and easy data collection

Specifications

NO.	Item Name			Technical indicator
1	Measuring range			(0~0.5)ppm or(0~1.0)ppm(can be extended)
2	Resolution			0.1ppb
3	Noise	Zero point noise		1ppb
		Span noise		5ppb
4	Minimum detectable value			2ppb
5	Stability	Zero drift		±5ppb/24hr
		Span drift	20% Span drift	±3ppb/24hr
			80% Span drift	±5ppb/24hr
6	Precision	20% measuring span		±3ppb
		80% measuring span		±5ppb
7	Linearity	Related coefficient(r)		more than 0.999
		Slope rate(a)		0.99-1.01
		intercept(b)		less than 1%F.S
8	Voltage stability			±1%F.S
9	Response time	Rising response time(T90)		3min(Only the analyzer itself, the gas  distributing system response time not included)
		Falling response time(T10)		3min(see the above description)