Arizona Instrument Computrac MAX-5000XL User Manual

AZI Customer Service 800-528-7411 or 602-470-1414 Page 73 of 92
8.4. Precision Sodium Tartrate Test
Perform the sodium tartrate test in Section 8.3 multiple times to determine the instruments
repeatability. This is a more critical verification of the instrument’s performance.
Mean, Standard Deviation, and Relative Standard Deviation are calculated using the
following formulas.
Mean = total of results divided by number of results.
Standard Deviation =
1-n
x-x
2
)(
Relative Standard Deviation expressed as percentage = Standard
Deviation divided by Mean, multiplied by 100.
 Perform the steps in the sodium tartrate test a total of five (5) times.
 After all five tests are complete, press [MENU] and select the STORED DATA
MENU.
 Press [ENT] to select tests.
 Arrow up or down to select the five tartrate tests and press [ANALYZE].
 The mean of the results should be within ± 0.1 of the value on the bottle label.
 If the result is out of tolerance, the most common causes of such errors are bent
or dirty sample pans, or debris that may have fallen into the balance shaft.
 Switch the unit OFF.
 Remove the pan support and the balance cover.
 Carefully clean the instrument. See page 78.
 Clean the oven and check the temperature sensor. See page 80.
 If a temperature calibration kit (AZI P/N Y990-0193) is available, calibrate the
system. See page 43.
 Repeat the tartrate test again, using a clean sample pan for each of the five
samples, and analyze the results.
 If the mean is still out of tolerance, call AZI customer service at 800-528-7411 or
602-470-1414 for assistance.

Arizona Instrument Computrac MAX-5000XL Specifications

General

Brand	Arizona Instrument
Model	Computrac MAX-5000XL
Category	Measuring Instruments
Language	English