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When shopping for an ultrasonic cleaning process or equipment it is important to know what you are looking for and exactly what you are trying to accomplish. The following questions will help you determine what equipment and process you require. These questions are for high end cleaning and some will not apply to general visual cleaning. If you have the information at hand the specification will be much easier.

Part Volume and Cleaning Method:

1.What part [or parts] will you be cleaning, give size L, W, H of part and the material and weight of the part.

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2.How many parts will be cleaned in one load?

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3.How many parts do you need to clean in one shift, how many shifts per day?

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4.Are there any chemical or heat restrictions?

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5.Do you have a source of DI water, if so what is its Meg Ohm rating?

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6.What contaminants are you cleaning from the part?

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7.What are your criteria for "clean" and how do you define it?

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8.How do you check the part for cleanliness, i.e. visual, or some other method?

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9.Will you need to dry the part after cleaning?

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10.Can you send samples for cleaning by the Manufacturer? [most companies will clean small sample lots at no charge]

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Process:

1.Determine what steps you need in your cleaning process.

2.The typical ultrasonic cleaning process consist of;

A.Ultrasonic Detergent Clean

B.Spray Rinse with Hot DI water

C.Ultrasonic overflow Rinse with DI Water

There are modifications to the above process, such as adding detergent tanks, additional rinses and dump rinses. The equipment manufacturer can be of great help in setting up the process. Samples sent in for cleaning will help define this process. Once you have decided on the process a written process sheet should be developed for that process. A typical process sheet is shown below.

Cleaning Process

Part # 943

Eng. OK

By:

Stage

Chemistry

Temp

Power

Frequency

Time

Ultrasonic Detergent

DI @ 18 Meg Ohm / 10% V 200 Detergent

130 deg F

 

500 W

 

170 kHz

 

7 min.

 

Spray Rinse

DI Water 15 Meg Ohm

110 F

N/A

N/A

5 min

Ultrasonic Overflow Rinse

DI Water @ 15 Meg Ohm

110 F

500 W

170 kHz

10 min

Special Instructions: Load parts in Work Holder # 342 insert into tank slowly and turn on ultrasonics, at end of cycle remove work holder slowly and place in next station. Visually inspect parts when removed from last rinse tank and place in drying system

Equipment:

1.What type of equipment are you looking for, automatic or manual?

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2.Will you require automatic indexing of the work load from tank to tank?

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3.What Services do You Have: electrical, water, exhaust, drains, etc.?

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4.What are your space requirements, how much room do you have for the system?

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5.Will the cleaning take place in a dedicated room, Clean Room or factory floor?

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6.Are there any local restrictions or regulations that may involve the cleaning system?

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7.Do you have a budget for the system?

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8.What is your time line for installing equipment?

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9.Do you want the manufacturer to install and start the equipment?

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10.Use the expertise of the equipment manufacturer to fill in the gaps in your process requirement. 

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Facilities:

1.Location and lay out of available space for Cleaning Line [ attach layout drawing]

2.Electrical available:_________________________________________________

3.Drain Location and size:_____________________________________________

4.Water Available at ____________PSI DI or House _______________________

5.xhaust Requirements:______________________________________________

Cleaning Tables

Filtration

Sets of Substrates

Tank 1 No Filtration

Tank 1 W/ Filtration

Tank 2 No Filtration

Tank 2 W/ Filtration

Tank 3 No Filtration

Tank 3 No Filtration

1

78.46

89.30

92.26.

97.69

96.09

99.00

2

68.30

87.63

87.25

97.16

93.50

98.97

3

60.66

87.19

82.68

97.01

90.91

98.95

4

54.46

87.05

78.41

96.96

88.32

98.95

5

49.22

87.02

74.40

96.95

88.75

98.95

6

44.71

87.01

70.63

96.94

83.19

98.95

7

40.77

87.00

67.06

96.94

80.66

98.95

8

37.29

87.00

63.69

96.94

78.16

98.90

 

Ultrasonic Energy for Cleaning:

Industrial: 50-70 watts per gallon
Lab: 80-100 watts per gallon
Critical;70 to 150 watts per gallon[dependent on temperature and solvent]
Note above wattage is for liquid with a specific gravity of 1.

Rules for sizing an Ultrasonic Tank

1.Allow 2"of fluid from bottom of work basket to bottom of tank.
2.Allow 2"of fluid over top of parts.
3.Allow 2" of freeboard 
4.Allow ½" around sides of tank to work basket edges.

Weights

Cubic in. of useful water In Tank

Lx W x[ H -2"]

Allows for free board of 2" 

Gallons

Lx W x [H-2"] / 231

Weight of Water in tank

1 cu ft =62.5 lb

Divide Cu in./1728 x 62.5= Weight

Weight of Water in pipe

Pipe length in Ft x dia. In "squared" x 0.34

Weight of 1 gallon of Water

8.33 lb

231 cubic in

Specific Gravity

1

Temps

Temp F

Temp C

75

24

80

27

86

30

91.4

33

95

35

100

38

105

41

111

44

116

47

120

49

125

52

131

55

135

57

140

60

145

63

150

66