Performance of optimized TVOCs sensor

In this paper, an improved TVOCs (total volatile organic compounds) sensor construction was studied. Base on this new construction, the optimized flow rate, the responding character and the linear range of detector were studied. The effect of different electrode positions on the signal intensity was tested at different voltages. Compared with traditional PID — axial PID3, the construction of this perpendicular PID could make the sensitivity loss decreased by a factor of 40%. Especially, a newly adopted automatic cleaning technique was tested, which could decrease the drift greatly and make the signal of the detector almost unchanged after two weeks of continuous detection. Due to this new construction, the response time was decreased and the accuracy consequently was improved. When coupled with automatic cleaning technique, labor intensive daily calibration and frequent lamp cleaning were eliminated. The improvements in this new design made the detector more compatible with field uses.