Ozone Generation Problems
Following the verification of power to the instrumental components, the next step in tracing a problem is the determination of ozone production. With the ozone toggle off and the vacuum pump on, read the signal output on the front of the Detector. Toggle the ozone on. A properly operating Detector will typically display a difference in background of 0.2 to 2 mV. If no change is observed, a problem most likely lies within the ozone generator itself, the high voltage transformer supplying power to the ozone generator, or in the transfer line system between the ozone generator and the reaction cell.
Ozone Generator
Loss of ozone from the ozone generator may arise from generator fault, or from a leak in the corona discharge tube. Typically a pungent ozone odor will be noticed emanating from the side of the Detector if the ozone generator is leaking.
WA R N I N G | Any operation requiring access to the inside of the equipment, could result in injury. To | |
avoid potentially dangerous shock, disconnect from power supply before opening the | ||
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| equipment. | |
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| High voltages supply the ozone generator. Unplug the instrument. | |
WA R N I N G | ||
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| Removal of the left side panel (as seen from the front of the Detector) and | |
| removal of the ozone generator cover panel may reveal corrosion caused by | |
| escaped ozone. If this is the case, replace the ozone generator. Resistance | |
| across the leads to the ozone generator should be infinite. Measure the | |
| resistance with an ohmmeter to verify. If there is a resistance, replace the | |
| ozone generator. |
High Voltage Transformer
WA R N I N G | The high voltage transformer produces 6000 - 8000 volts. |
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| The following test should only be performed by those with high voltage experience using |
| high voltage probes. |
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| Using high voltage probes, directly measure the secondary output of the ozone |
| generator. A properly functioning generator will produce approximately |
| 7500 volts. Output less than 3000 volts mandates replacement of the high |
| voltage transformer. |
Operation and Maintenance Manual | 109 |
