(1)Name of the instrument 
Ecotech EC9810 SO2 analyzer 
(2)People in charge of the instruments 
Gaowei
(3)Descriptions of the instrument 
The EC/ML?9850 sulfur dioxide (SO2) analyzer is an ultraviolet (UV) fluorescence
spectrometer designed to continuously measure low concentrations of SO2
in ambient air. The 9850 analyzer comprises an optical sensor assembly, an analog
electronic signal preprocessor module, microprocessor-based control and computation
electronics, and a pneumatic system that samples ambient air by point
monitoring.

(4)Measurement accuracy and uncertainty 
Noise (RMS)
Measurement process: 0.25 ppb or 0.1% of concentration reading, whichever
is greater; with Kalman filter active.
Lower Detectable Limit
Measurement process: Less than 0.5 ppb or 0.2% of concentration reading,
whichever is greater; with Kalman filter active.
Precision
0.5 ppb or 1% of reading, whichever is greater.

(5)Names of the measured species 
Surface SO2 
(6)Units of the measured species 
PPB
(7)Measurement site 
Pudong
(8)Measurement date (from Mon/day/year to Mon/Day/year) 
From 08/30/2009 to 09/22/2009