MIL-STD-1330D(SH) APPENDIX D
w/ Change 1
D.11.6 Slide the dish under the SQM sensor. Place the sensor directly on the top edge of the dish. Align the dish so that the outside of the dish aligns with the outside of the sensor. Press the ENTER key on the SQM and observe the reading. Remove the dish. Log the reading on data sheet 4. Place the dish back on the hot plate.
a. The above actions shall be accomplished as quickly as possible to minimize the time the dish is exposed to the UV light.
b. Since the monitor is not sensitive to the temperatures specified in this procedure, there is no need to allow the dish to cool before taking a reading.
D.11.7 After 3 minutes has elapsed, repeat D.11.6.
D.11.8 Check that the dish cleanliness (reading #2) is within 100 counts of the Clean Dish Acceptance Criteria recorded in data sheet 3 for the specific dish being used for the analysis. Readings outside this range indicate either
a problem with dish cleanliness or equipment operation. Repeat D.11.3 through D.11.7 to check dish cleanliness. If still unable to meet the baseline cleanliness acceptance criteria, perform equipment maintenance per D.8 and
determine new dish acceptance criteria as specified in D.10.
D.11.9 Shake the sample container vigorously for no less than 15 seconds. Remove the cap from the sample container. Pour approximately 2 to 3 mL of the sample into the 10 mL beaker. Immediately replace the cap on the sample to minimize evaporative losses. Fill the pipet with 0.5 mL of solution by rotating the filler/dispenser knob. With the dish on the hot plate, transfer this 0.5 mL of solution to the evaporating dish by rotating the knob in the opposite direction. Allow the solvent to evaporate. Repeat for a total of 2 doses.
D.11.10 Slide the dish under the SQM sensor. Place the sensor directly on the top edge of the dish. Align the dish so that the outside of the dish aligns with the outside of the sensor. Press the ENTER key on the SQM and observe the reading. Remove the dish. Log the reading in data sheet 4. Place the dish back on the hot plate.
a. The above actions shall be accomplished as quickly as possible to minimize the time the dish is exposed to the UV light.
b. Since the monitor is not sensitive to temperatures specified in this procedure, there is no need to allow the dish to cool before taking a reading.
c. If an error occurs while taking a reading, such as pressing the wrong key or dropping the dish, the reading cannot be repeated. If this occurs, start over from D.11.3.
NOTE 24: Oil and grease, along with most other contaminants, will cause the counts to decrease. In rare instances, such as some surfactants, the counts can increase.
D.11.11 Compare the reading from D.11.10 to the Clean Dish Acceptance Criteria and the Dish 5 ppm
Acceptance Criteria recorded in data sheet 3 as described below, and as shown in Table D-V and Figure 5:
a. If the reading is less than the Clean Dish Acceptance Criteria plus 50 counts and greater than or equal to the Dish 5 ppm Acceptance Criteria, the results are acceptable and are reported as less than 5 ppm oil and grease. Log all results on data sheet 4.
b. If the reading is less than the Dish 5 ppm Acceptance Criteria, the results are not acceptable and the instrument requires recleaning.
c. If the reading is greater than or equal to the Clean Dish Acceptance Criteria plus 50 counts, the results are
not acceptable and the instrument requires recleaning.
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