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3.2.1. Power Output Instrumentation used to measure power was introduced in Section 1.0 and included a Power Measurements Model 7600 ION. The data quality objective for power output is ± 1.5 percent of reading, which is lower than the typical uncertainty set forth in PTC-22 of ± 1.8 percent. The power output DQO was also applied to the ION 7500 power meter used to monitor gas compressor power consumption. The Test Plan specified factory calibration of the ION meters with a NIST-traceable standard to determine if the power output DQO was met. The Test Plan also required the GHG Center to perform several reasonableness checks in the field to ensure that the meter was installed and operating properly. The following summarizes the results. The meters were factory calibrated by Power Measurements within one year of being used at the test site (July 2002 for the 7600 ION and April 2003 for the 7500 ION). Calibrations were conducted in accordance with Power Measurements’ standard operating procedures (in compliance with ISO 9002:1994) and are traceable to NIST standards. The meters were certified by Power Measurements to meet or exceed the accuracy values summarized in Table 3-2 for power output, voltage, current, and frequency. NIST-traceable calibration records are archived by the GHG Center. Pretest factory calibrations on the meters indicated that accuracy was within ±0.05 percent of reading and this value, combined with the 1.0-percent error inherent to the current and potential transformers, met the ± 1.5- percent DQO. Using the manufacturer-certified calibration results and the average power output measured during the full-load testing, the error during all testing is determined to be ± 0.56 kW. Additional QC checks were performed on the 7600 ION to verify the operation after installation of the meters at the site and prior to the start of the verification test. The results of these QC checks (summarized in Table 3-3) are not used to reconcile the DQI goals, but to document proper operation in the field. Current and voltage readings were checked for reasonableness using a hand-held Fluke multimeter. These checks confirmed that the voltage and current readings between the 7600 ION and the Fluke were within the range specified in the Test Plan as shown in Table 3-3. These results led to the conclusion that the 7600 ION was installed and operating properly during the verification test. The ± 1.50-percent error in power measurements, as certified by the manufacturer, was used to reconcile the power output DQO (discussed above) and the electrical efficiency DQO (discussed in Section 3.2.2). 3-5 SRI/USEPA-GHG-VR-27 September 2003PDF Image | Environmental Technology Verification Report
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