Now are changing the ultra-low, according to the ultra-low standard is eight parameters, SO2, NOX, O2, temperature, pressure, flow, dust, humidity, if it is uploaded at the mouth of the proposed sulfur, nitrogen measurement with the dilution method, a very good solution to the loss of sulfur throughout the calibration of the cold-drying method, the measurement of dust because of the humidity is large, to use the extractable dust meter, the majority of the flowmeter are used in the matrix flowmeter, and of course, to look at the working conditions. To see the conditions, I personally think that the ammonia desulfurization is not very applicable, easy to plug, other sub-parameters according to the matching on the line, if you don't need to upload that's another matter, a little bit close to it doesn't matter