ASTM D7094 for flash point by modified continuously closed cup (MCCCFP) tester
9. Quality Control Checks
9.1 Verify the performance of the instrument at least once per year by determining the flash point of a certified reference material (CRM) such as those listed in Appendix X1, which is reasonably close to the expected temperature range of the samples to be tested. The material shall be tested in accordance with Section 11 of this test method, and the observed flash point obtained in 11.11 shall be corrected for barometric pressure as described in Section 12. The flash point shall be within the limits stated in Table X1.1.
9.2 Once the performance of the instrument has been verified, the flash point of Secondary Working Standards (SWSs) can be determined along with their control limits. These secondary materials can then be utilized for more frequent performance checks (see Appendix X1). A performance check with a SWS shall be performed every day the instrument is in use.
9.3 When the flash point obtained is not within the limits stated in 9.1 or 9.2, follow the manufacturer's instruction for cleaning and maintenance, and check the instrument calibration (see Section 10). After any adjustment, repeat the test in 9.1 or 9.2, using a fresh test specimen, with special attention to the procedural details prescribed in this test method. (Warning - The use of single component verification materials, such as those listed in Table X1.1, will only prove the calibration of the equipment. It will not check the accuracy of the entire test method which includes sample handling. Losses due to evaporation of a single component material will not affect the flash point as is the case with losses of light ends in multi component mixtures.)
10. Calibration
10.1 Pressure Transducer:
10.1.1 Check the calibration of the pressure transducer when needed, as indicated from the quality control checks performed in accordance with Section 9. The calibration of the transducer is checked using the ambient barometric pressure as a reference.
10.1.2 If the displayed atmospheric pressure is not equal to the ambient barometric pressure, adjust the transducer control until the appropriate reading is observed. The ambient barometric pressure is the actual station pressure at the location of the tester at the time of measurement. (Warning - Many aneroid barometers, such as those used at weather stations and airports, are precorrected to give sea level readings: These shall not be used for calibration of the apparatus.)
10.2 Temperature Sensor - Check the calibration of the temperature sensor used to monitor the temperature of the sample against a certified reference thermometer when needed, as indicated from the quality control checks (see Section 9). Use only reference thermometers which are traceable to the National Institute of Standards and Technology (NIST) or national authorities in the country in which the equipment is used.
