Density, Relative Density (Specific Gravity), or API Gravity - Hydrometers and Thermohydrometers


 

ASTM Hydrometers and Thermohydrometers
For density, relative density (specific gravity) or API gravity determination of crude petroleum, liquid petroleum products and mixtures of petroleum and non-petroleum products. For density of LPG and light hydrocarbons refer to K26150.

Calibrated hydrometers and thermohydrometers are available from Koehler with an ISO/IEC 17025 and ANSI/NCSL Z-540-1 Report of Calibration.

When inquiring about calibrated hydrometers and thermohydrometers, please refer to the catalog number for the corresponding hydrometer or thermohydrometer and replace the middle three zeros in the catalog number with 004. Example: 251-000-01H API Gravity Hydrometer would be 251-004-01H Certified API Gravity Hydrometer.

Specifications
Conforming to the specifications of: ASTM E100

Applicable Test Method Standards
ASTM D287, D1298, D6074, D6158; API MPMS Chapter 9.1; IP 160; ISO 3675; DIN 51757


 

API Gravity Hydrometers
Standard temperature 60F, subdivisions 0.1 API, length 330mm

Catalog
Number

ASTM Hydrometer No.

Nominal API Gravity Range, deg.

251-000-01H

1H

–1 to +11

251-000-02H

2H

9 to 21

251-000-03H

3H

19 to 31

251-000-04H

4H

29 to 41

251-000-05H

5H

39 to 51

251-000-06H

6H

49 to 61

251-000-07H

7H

59 to 71

251-000-08H

8H

69 to 81

251-000-09H

9H

79 to 91

251-000-10H

10H

89 to 101

 

Specific Gravity Hydrometers
Standard temperature 60/60F, subdivisions 0.0005, length 330mm

Catalog
Number

ASTM Hydrometer No.

Nominal Specific Gravity Range

251-000-82H

82H

0.650 to 0.700

251-000-83H

83H

0.700 to 0.750

251-000-84H

84H

0.750 to 0.800

251-000-85H

85H

0.800 to 0.850

251-000-86H

86H

0.850 to 0.900

251-000-87H

87H

0.900 to 0.950

251-000-88H

88H

0.950 to 1.000

251-000-89H

89H

1.000 to 1.050

251-000-90H

90H

1.050 to 1.100

 

 

API Gravity Hydrometers
Standard temperature 60F, subdivisions, 0.1 API, length 330mm

Catalog
Number

ASTM Hydrometer No.

Nominal API Gravity Range, deg.

251-000-21H

21H

0 to 6

251-000-22H

22H

5 to 11

251-000-23H

23H

10 to 16

251-000-24H

24H

15 to 21

251-000-25H

25H

20 to 26

251-000-26H

26H

25 to 31

251-000-27H

27H

30 to 36

251-000-28H

28H

35 to 41

251-000-29H

29H

40 to 46

251-000-30H

30H

45 to 51

251-000-31H

31H

50 to 56

251-000-32H

32H

55 to 61

251-000-33H

33H

60 to 66

251-000-34H

34H

65 to 71

251-000-35H

35H

70 to 76

251-000-36H

36H

75 to 81

251-000-37H

37H

80 to 86

251-000-38H

38H

85 to 91

251-000-39H

39H

90 to 96

251-000-40H

40H

95 to 101

 

API Gravity Thermohydrometers - Thermometer in Body
Standard temperature 60F, subdivisions 0.1 API, length 380mm, thermometer scale F 0-150 (designation L), 30 to 180 (designation M), 60 to 220 (designation H)

Catalog
Number

ASTM Thermohydrometer No.

Nominal API Gravity Range, deg.

251-000-51HH

51HH

–1 to 11

251-000-51HL

51HL

–1 to 11

251-000-52HH

52HH

9 to 21

251-000-52HL

52HL

9 to 21

251-000-53HM

53HM

19 to 31

251-000-53HL

53HL

19 to 31

251-000-54HM

54HM

29 to 41

251-000-54HL

54HL

29 to 41

251-000-55HL

55HL

39 to 51

251-000-56HL

56HL

49 to 61

251-000-57HL

57HL

59 to 71

251-000-58HL

58HL

69 to 81

251-000-59HL

59HL

79 to 91

251-000-60HL

60HL

89 to 101

 

API Gravity Thermohydrometers Thermometer in Stem
Standard temperature 60F, subdivisions 0.1 API, length 380mm, temperature scale F 30-220

Catalog
Number

ASTM Thermohydrometer No.

Nominal API Gravity Range, deg.

251-000-71H

71H

–1 to 11

251-000-72H

72H

9 to 21

251-000-73H

73H

19 to 31

251-000-74H

74H

29 to 41

 

Specific Gravity Hydrometers
Standard temperature 60/60F, subdivisions 0.001 length 260mm

Catalog
Number

ASTM Hydrometer No.

Nominal Specific Gravity Range

251-000-102H

102H

0.650 to 0.700

251-000-103H

103H

0.700 to 0.750

251-000-104H

104H

0.750 to 0.800

251-000-105H

105H

0.800 to 0.850

251-000-106H

106H

0.850 to 0.900

251-000-107H

107H

0.900 to 0.950

251-000-108H

108H

0.950 to 1.000

251-000-125H

125H

1.000 to 1.050

251-000-126H

126H

1.050 to 1.100

251-000-127H

127H

1.100 to 1.150

251-000-128H

128H

1.150 to 1.200

251-000-129H

129H

1.200 to 1.250

251-000-130H

130H

1.250 to 1.300

251-000-131H

131H

1.300 to 1.350

251-000-132H

132H

1.350 to 1.400

251-000-133H

133H

1.400 to 1.450

251-000-134H

134H

1.450 to 1.500

251-000-135H

135H

1.500 to 1.550

251-000-136H

136H

1.550 to 1.600

251-000-137H

137H

1.600 to 1.650

251-000-138H

138H

1.650 to 1.700

251-000-139H

139H

1.700 to 1.750

251-000-140H

140H

1.750 to 1.800

251-000-141H

141H

1.800 to 1.850

 

ASTM Metric Thermohydrometers
Standard temperature 15C, subdivisions 0.5kg/m3, length 380mm, thermometer scale C: –20 to +65 (designation L), 0 to 85 (designation M), 20 to 105 (designation H)

Catalog
Number

ASTM Thermohydrometer No.

Density, Range kg/m3

251-000-300HL

300HL

600 to 650

251-000-301HL

301HL

650 to 700

251-000-302HL

302HL

700 to 750

251-000-302HM

302HM

700 to 750

251-000-303HL

303HL

750 to 800

251-000-303HM

303HM

750 to 800

251-000-304HL

304HL

800 to 850

251-000-304HM

304HM

800 to 850

251-000-305HL

305HL

850 to 900

251-000-305HM

305HM

850 to 900

251-000-306HL

306HL

900 to 950

251-000-306HM

306HM

900 to 950

251-000-307HL

307HL

950 to 1000

251-000-307HH

307HH

950 to 1000

251-000-308HH

308HH

1000 to 1050

251-000-308HL

308HL

1000 to 1050

251-000-309HH

309HH

1050 to 1100

251-000-309HL

309HL

1050 to 1100


 

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