OS. series

Sound power and sound pressure levels according to application range

The measurements were taken with the refrigerant R717 (ammonia), the motor was acoustically separated from the compressor with insulating mats.
The calculated sound pressure level refers to free field conditions with hemispherical sound propagation at a distance of 1 m.
The tolerance for all specifications is +/- 2 dB(A).
For the measured quantities and their units: Introduction

Sound power and sound pressure levels for open drive screw compressors OSKA according to application range

Compressor
(operating frequency)

Sound power level in dB(A)

Sound pressure level in dB(A)

Air conditioning

Medium temperature

Low temperature

Air conditioning

Medium temperature

Low temperature

OSKA9593
(50Hz)

89.0

89.2

87.1

81.0

81.2

79.1

OSKA9593
(60Hz)

94.2

95.0

92.6

86.2

87.0

84.6

Sound power levels (one-third octave band) and sound pressure levels

Sound power and sound pressure levels for open drive screw compressors OSKA
to: evaporation temperature, tc: condensing temperature



Compressor
(operating frequency)




to/tc in °C

Sound power level in dB(A) at different frequencies (one-third octave band)

Sound pressure level in dB(A)

25 Hz

31.5 Hz

40 Hz

50 Hz

63 Hz

80 Hz

100 Hz

125 Hz

160 Hz

200 Hz

250 Hz

315 Hz

400 Hz

500 Hz

630 Hz

800 Hz

1000 Hz

1250 Hz

1600 Hz

2000 Hz

2500 Hz

3150 Hz

4000 Hz

5000 Hz

6300 Hz

8000 Hz

10000 Hz

OSKA8571
(50 Hz)

+5/+50

34.5

37.9

40.6

34.1

43.7

47.6

38.3

29.4

56.0

57.2

70.4

71.7

70.0

74.8

74.6

82.0

83.1

78.3

75.4

71.9

72.1

70.5

66.7

61.3

61.1

59.3

57.6

79.9

-10/+45

34.1

38.6

38.6

43.8

38.8

46.6

42.1

47.5

58.0

59.5

73.5

69.6

70.1

76.5

73.7

82.3

80.8

75.6

73.7

71.4

69.9

68.1

63.3

60.0

59.2

57.6

56.7

79.0

-20/+39

35.2

39.3

42.3

39.6

44.5

43.8

44.6

37.7

57.1

60.7

78.7

68.0

71.4

77.4

73.0

81.2

79.3

72.6

72.5

69.8

67.4

68.1

64.1

59.9

59.2

58.0

57.6

78.6

OSKA8571
(60 Hz)

+5/+50

36.0

39.4

44.0

46.5

44.3

50.8

49.7

46.9

59.2

64.6

66.8

69.5

73.2

73.1

81.3

89.1

90.1

80.7

80.6

76.7

74.3

72.4

69.5

64.8

64.6

62.6

61.0

85.7

-10/+45

37.2

42.0

44.6

40.4

47.5

49.0

44.4

51.5

56.4

63.1

68.0

76.4

74.4

76.2

84.2

87.3

88.2

80.3

79.2

76.6

73.4

71.7

68.8

64.6

62.4

60.9

59.8

84.7

-20/+39

38.2

40.7

43.6

46.1

45.7

51.7

43.4

50.3

58.4

63.3

71.0

78.5

76.2

79.3

86.6

83.8

84.0

85.5

81.6

77.8

73.8

72.9

70.1

64.7

63.3

61.3

60.2

84.5

OSKA9593
(50 Hz)

+5/+50

11.5

7.3

30.6

22.6

42.2

47.0

52.5

56.2

61.4

77.5

66.8

72.2

77.2

71.6

83.0

82.8

78.7

78.9

75.1

74.0

69.6

74.6

57.9

55.3

54.9

60.5

59.1

81.0

-10/+45

16.9

23.0

27.3

33.6

38.8

64.3

52.8

56.3

61.4

75.2

66.6

73.0

75.1

77.4

83.9

80.9

78.6

79.2

76.5

74.8

74.1

76.1

65.9

64.0

60.9

58.0

55.7

81.2

-35/+40

18.3

27.7

13.4

39.5

39.2

40.6

53.0

56.8

61.4

76.1

66.9

73.0

77.9

71.4

79.9

76.8

77.8

75.8

75.5

73.0

73.2

76.3

66.1

63.1

61.7

58.2

57.6

79.1

OSKA9593
(60 Hz)

+5/+50

24.8

35.7

36.2

37.7

50.4

49.4

53.1

60.0

63.5

65.0

71.3

73.7

75.5

83.8

86.2

91.7

79.9

81.0

78.4

75.9

69.3

75.7

61.8

57.7

54.6

66.1

61.9

86.2

-10/+45

27.6

31.0

35.5

33.3

49.4

49.1

53.0

59.2

63.7

66.1

77.9

73.8

75.2

84.6

86.7

92.5

81.4

79.3

78.8

76.0

77.0

78.8

68.6

64.8

62.7

64.9

60.4

87.0

-35/+40

23.8

27.1

35.8

34.8

47.4

49.3

53.0

59.8

64.2

66.5

78.8

74.0

75.2

85.1

82.3

87.7

83.8

80.8

79.2

75.5

76.1

78.6

69.4

67.5

65.1

67.2

63.0

84.6