Computrac MAX-1000 User's Manual - Arizona Instrument

12 PERFORMANCE VERIFICATIONPeriodic checks of the system are recommended to verify proper system operation.These periodic checks will satisfy some quality assurance guidelines whenperformed daily. A log is recommended, either hand written or computermanaged, which will record the weight tests, sodium tartrate tests and retainedsample's results. Shifts in results that are out of range can be quickly detected andthe appropriate corrections made.Any time the unit is moved, the power is switched off or the balance is jarred orbumped, the 20 gram balance calibration, should be performed (see page 37).The weight test should be the basis for a daily quality control verification of theMAX-1000 and should be the first test performed every day.In addition, if there is any concern about the accuracy of the instrument, thesesame tests may be performed to evaluate instrument performance.12.1 WEIGHT TESTThis test simulates moisture content with the removal of one of two knownweights. The test is run with specific parameters which are stored under MemoryStart 00. See the section on MEMRY START selections on page 23.12.1.1 From The FINAL TEST screen, press the “Memry” key.12.1.2 If the highlight bar is not already there, use the up and down arrows to select“00 ID: WEIGHT.”12.1.3 Place a clean, empty sample pan on the pan support.12.1.4 Close the lid and press the “START” key.12.1.5 When the OPEN LID appears on the screen, open the lid and carefully place both a5 gram and a 3 gram weight near the center of the sample pan.12.1.6 Close the lid.12.1.7 After the testing screen is displayed, gently open the lid and carefully remove the 3gram weight.12.1.8 Wait for the end of the test.55