D.10.1 Clean dish acceptance criteria.
MIL-STD-1330D(SH) APPENDIX D
w/ Change 1
NOTE 3: If a dish has been in long-term storage in excess of one year, it may be necessary to remove a thin corrosion layer. This can be accomplished by applying a small amount of polish with a cotton or foam-tipped swab and rubbing gently for 1 minute. The recommended polish is available from Buehler, 1-800-283-4537, Buehler Master Polish Suspension, catalog #40-6375-032.
D.10.1.1 Turn the SQM control unit ON. After 15 seconds when the system boots up, set the mode to PEAK. Allow 15 minutes to warm up. Check that the control unit gain setting is at 4 for a new dish, or the previous gain setting recorded on data sheet 3.
D.10.1.2 Using Sparkleen cleaning solution (D.6.2(a)) in a container (D.5.1(i)), THOROUGHLY clean the evaporating dish by scrubbing by hand using a paper towel (D.5.1(h)) for about one minute. Rinse THOROUGHLY, for about 20 to 30 seconds, under running tap water. Shake off excess water.
NOTE 4: Do not touch the inside surface after cleaning and do not dry the inside surface with a towel or cloth. D.10.1.3 Using the washing bottle (D.5.1(d)) filled with CFC-113, HCFC-225, or HFE-7100, tilt the dish and
spray it with solvent to displace the water droplets off of the dish, particularly from the flat area at the bottom of the
evaporating area. Droplets remaining near the top edge are acceptable. The solvent shall be directed into a "solvent waste" container.
D.10.1.4 Place the dish on a hot plate set per D.8.1.1. Keep the dish on the hot plate until no solvent or water droplets remain on the surfaces where evaporation occurs. On the flat top edge and bottom, any residual water can be wiped with a clean cloth.
NOTE 5: Accomplish the following actions as quickly as possible to minimize the time the dish is exposed to the UV light. 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.10.1.5 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 3. Place the dish back on the hot plate.
a. If the reading is greater than 1000 counts (off scale), reduce the gain setting on the control unit. Do not reduce the gain below 2. A gain setting less than 2 indicates a possible problem with the equipment. Check the equipment by performing D.8.3.
b. If the reading is less than 500 counts, increase the gain setting on the control unit. A gain setting that needs to be greater than 8 generally indicates a dirty dish or a problem with the equipment. Clean dish per D.10.1.2. If
this does not correct the problem, check the equipment by performing D.8.3. c. Log the control unit gain setting on data sheet 3.
D.10.1.6 After 3 minutes has elapsed, repeat D.10.1.5 (reading #2).
D.10.1.7 Repeat steps D.10.1.2 to D.10.1.6 (cleaning #2) until two consecutive readings from D.10.1.6, using the same control unit gain, are within the following acceptable range: the difference between the readings shall be less than 100 counts.
D.10.1.8 The average of the two acceptable readings shall be recorded in data sheet 3 as the Clean Dish
Acceptance Criteria.
D.10.2 5 ppm acceptance criteria without baseline.
D.10.2.1 Turn the SQM control unit ON. After 15 seconds when the system boots up, set the mode to PEAK. Allow 15 minutes to warm up. Check that the control unit gain setting is as specified in data sheet 3 for the dish being used.
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