The standard BS 718 : 1991 is generally aligned with ISO 387 and ISO 649. The specification includes five series and three sub-series of Hydrometers, of which the most widely used are listed. They are calibrated using the accepted units of density: grams per milliliter (g/ml).

BS718:1991 Density Hydrometers Series S50

Density HydrometersRange Span 0.050g/ml
Length = 190mm
Divisioned in 0.002 g/ml
adjusted at 20°

Sizes & Specifications

Hydrometer Range
g/ml

Surface
Tension

Product No

0.60 to 0.65

Low

10/300/0

0.65 to 0.70

10/301/0

0.70 to 0.75

10/302/0

0.75 to 0.80

10/303/0

0.80 to 0.85

10/304/0

0.85 to 0.90

10/305/0

0.90 to 0.95

10/306/0

0.95 to 1.00

10/307/0

1.00 to 1.05

Medium

10/308/0

1.05 to 1.10

10/309/0

1.10 to 1.15

10/310/0

1.15 to 1.20

10/311/0

1.20 to 1.25

10/312/0

1.25 to 1.30

10/313/0

1.30 to 1.35

10/314/0

1.35 to 1.40

10/315/0

1.40 to 1.45

10/316/0

1.45 to 1.50

10/317/0

1.50 to 1.55

10/318/0

1.55 to 1.60

10/319/0

1.60 to 1.65

10/320/0

1.65 to 1.70

10/321/0

1.70 to 1.75

10/322/0

1.75 to 1.80

10/323/0

1.80 to 1.85

10/324/0

1.85 to 1.90

10/325/0

1.90 to 1.95

10/326/0

1.95 to 2.00

10/327/0


BS718:1991 Density Hydrometers Series M50

Density HydrometersRange Span 0.050g/ml
Length = 270mm
Divisioned in 0.001 g/ml
adjusted at 20°C°

Sizes & Specifications

Hydrometer Range
g/ml

Surface
Tension

Product No

0.60 to 0.65

Low

10/330/0

0.65 to 0.70

10/331/0

0.70 to 0.75

10/332/0

0.75 to 0.80

10/333/0

0.80 to 0.85

10/334/0

0.85 to 0.90

10/335/0

0.90 to 0.95

10/336/0

0.95 to 1.00

10/337/0

1.00 to 1.05

Medium

10/338/0

1.05 to 1.10

10/339/0

1.10 to 1.15

10/340/0

1.15 to 1.20

10/341/0

1.20 to 1.25

10/342/0

1.25 to 1.30

10/343/0

1.30 to 1.35

10/344/0

1.35 to 1.40

10/345/0

1.40 to 1.45

10/346/0

1.45 to 1.50

10/347/0

1.50 to 1.55

10/348/0

1.55 to 1.60

10/349/0

1.60 to 1.65

10/350/0

1.65 to 1.70

10/351/0

1.70 to 1.75

10/352/0

1.75 to 1.80

10/353/0

1.80 to 1.85

10/354/0

1.85 to 1.90

10/355/0

1.90 to 1.95

10/356/0

1.95 to 2.00

10/357/0


BS718:1991 Density Hydrometers Series L50

Density HydrometersRange Span 0.050g/ml
Length = 330mm
Divisioned in 0.0005 g/ml
adjusted at 20°C

Sizes & Specifications

Hydrometer Range
g/ml

Surface
Tension

Product No

0.60 to 0.65 g/ml

Low

10/360/0

0.65 to 0.70 g/ml

10/361/0

0.70 to 0.75 g/ml

10/362/0

0.75 to 0.80 g/ml

10/363/0

0.80 to 0.85 g/ml

10/364/0

0.85 to 0.90 g/ml

10/365/0

0.90 to 0.95 g/ml

10/366/0

0.95 to 1.00 g/ml

10/367/0

1.00 to 1.05 g/ml

Medium

10/368/0

1.05 to 1.10 g/ml

10/369/0

1.10 to 1.15 g/ml

10/370/0

1.15 to 1.20 g/ml

10/371/0

1.20 to 1.25 g/ml

10/372/0

1.25 to 1.30 g/ml

10/373/0

1.30 to 1.35 g/ml

10/374/0

1.35 to 1.40 g/ml

10/375/0

1.40 to 1.45 g/ml

10/376/0

1.45 to 1.50 g/ml

10/377/0

1.50 to 1.55 g/ml

10/378/0

1.55 to 1.60 g/ml

10/379/0

1.60 to 1.65 g/ml

10/380/0

1.65 to 1.70 g/ml

10/381/0

1.70 to 1.75 g/ml

10/382/0

1.75 to 1.80 g/ml

10/383/0

1.80 to 1.85 g/ml

10/384/0

1.85 to 1.90 g/ml

10/385/0

1.90 to 1.95 g/ml

10/386/0

1.95 to 2.00 g/ml

10/387/0


BS718:1991 Density Hydrometers Series M100

Density HydrometersRange Span 0.100g/ml
Length = 250mm
Divisioned in 0.002 g/ml
adjusted at 20°C

Sizes & Specifications

Hydrometer Range
g/ml

Surface
Tension

Product No

0.60 to 0.70

Low

10/400/0

0.70 to 0.80

10/401/0

0.80 to 0.90

10/402/0

0.90 to 1.00

10/403/0

1.00 to 1.10

Medium

10/404/0

1.10 to 1.20

10/405/0

1.20 to 1.30

10/406/0

1.30 to 1.40

10/407/0

1.40 to 1.50

10/408/0

1.50 to 1.60

10/409/0

1.60 to 1.70

10/410/0

1.75 to 1.80

10/411/0

1.80 to 1.90

10/412/0

1.90 to 2.00

10/413/0


BS718:1991 Density Hydrometers Sub-series M50 SP

Density HydrometersThis sub-series has a greater accuracy than the standard M50 Series and is only available over a limited range of density. This sub-series is commonly used in the Petroleum industry and corresponds to IP 160
Range Span 0.050g/ml
Length = 270mm
Divisioned in 0.001 g/ml
adjusted at 15°C

Sizes & Specifications

Hydrometer Range
g/ml

Surface
Tension

Product No

0.60 to 0.65

Low

10/450/0

0.65 to 0.70

10/451/0

0.70 to 0.75

10/452/0

0.75 to 0.80

10/453/0

0.80 to 0.85

10/454/0

0.85 to 0.90

10/455/0

0.90 to 0.95

10/456/0

0.95 to 1.00

10/457/0

1.00 to 1.05

10/458/0

1.05 to 1.10

10/459/0


 

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