Although the instrument comes calibrated against a NIST-traceable ozone standard, the menu allows the user to change the calibration parameters of the ozone output if desired. For example, if you maintain an ozone reference instrument in the lab, you can use the OCS as a transfer standard for calibrating ozone instruments in the field relative to your lab standard.
For example, if you maintain an ozone reference instrument in the lab, you can use the OCS as a transfer standard for calibrating ozone instruments in the field relative to your lab standard.
The Ozone Cal SourceÔ is housed in the same small, rugged instrument case as the Model 202 and Model 205 Ozone Monitors.
Some applications of the Model 306 Ozone Calibration Source include:
Calibration of ozone monitors in the field. This highly portable transfer standard is especially useful for maintaining the calibrations of networks of ozone monitors.
Testing of materials such as rubber, plastics and paint for effects of ozone exposure.
Studies of the effect of ozone on plants where a calibrated source of ozone is required.
The following are data obtained for the calibration of a Model 202 Ozone Monitor, which had previously been calibrated against our NIST-traceable standard instrument. New target ozone concentrations were entered into the Ozone Cal Source every 5 minutes. As can be seen from the data, the new ozone concentrations are reached within 3 data points (30 s). Concentrations were stepped up and down twice to produce 4 calibration plots. Target ozone mixing ratios were 0, 50, 100, 200, 400, 600, 800 and 1,000 ppbv. There is an extra measurement at 150 ppbv in the rise side of the first set of 'stairsteps'.
The following figure shows the 4 calibration curves produced from the 4 sets of increasing and decreasing ozone concentrations. The data points and lines for the 4 least squares fits, which are plotted in different colors, overlap so well that it is difficult to distinguish them. The equations for the linear regressions show that the slopes of the 4 individual calibration curves agree to better than ±1% and the intercepts agree to ±2 ppbv. Correlation coefficients (R2) are all 0.9999 or 1.0000.
Method of Ozone Production: UV Photolysis of O2 at 185 nm
Ozone Concentration Range: 0 ppbv and 30 ppbv to 1,000 ppbv
Precision and Accuracy of
Output: Greater of 2 ppbv or 1% of ozone concentration
Response time for Change in
Ozone Output Concentration: 30 s to reach 95% of concentration change
Flow Rate: 3.0 Liter/min volumetric
Power Requirements: 12 V dc or 120/240 V ac, 18 watt
Size: 3.5 x 8.5 x 11 inches (9 x 21 x 29 cm)
Weight: 5.6 lb (2.6 kg)