Liquid Level Indicators

Hydraulic level indicators, also known as fluid level indicators, are used for checking the fluid levels in tanks and other hydraulic systems. Level indicators and level gauges are fitted onto the system and usually feature a glass window to display the level of the fluid.

Types of hydraulic level indicator:

There is a wide range of liquid level indicators for different applications. Some offer a visual check, while others display more more information, such as a gauge or a thermometer to also show temperature levels. The main types include:

  • Column level indicators use a transparent column to display the fluid level using a scale. Column level indicators come in a variety of lengths depending on the scale they can measure. The scale length can vary, for example, from 30 mm to 200 mm. Your choice of scale length will depend on your chosen application.
  • Sight Glasses, also known as oil sight glasses, are transparent windows which are attached to a tank as a visual level indicator. Oil level sight glasses are a quick way to check oil levels, but do not feature a scale like a column indicator would. Sight glasses usually attach to the system using a threaded connection featuring a rubber seal. Some oil level indicators also feature a metal contrast screen and a level point for easy measuring.

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Description Price Connection Thread Level Indicator Type Scale Length Sight Gauge Material Screws and Fittings Material Maximum Operating Temperature Minimum Operating Temperature Connection Thread Size Connection Thread Standard Seal Material
RS Stock No. 196-2757
Mfr. Part No.FL.69221
BrandParker
SGD53.83
Each
units
- Column Level Indicator 161mm - - +90°C -30°C - - -
RS Stock No. 331-9543
Mfr. Part No.FL69213
BrandParker
SGD46.53
Each
units
M12 Column Level Indicator 74mm PA (Lens & Base), Polystyrene (Shroud) Steel +90°C -30°C M12 Metric -
RS Stock No. 196-2763
Mfr. Part No.FL.69321
BrandParker
SGD66.98
Each
units
- Column Level Indicator 254mm - - +90°C -30°C - - -
RS Stock No. 287-0160
Mfr. Part No.11101
BrandElesa
SGD8.725
Each (In a Pack of 2)
units
G 1 Sight Glass - - - +110°C - 1 in G Nitrile Rubber
RS Stock No. 331-9559
Mfr. Part No.FL.69313
BrandParker
SGD52.97
Each
units
M12 Column Level Indicator 202mm PA (Lens & Base), Polystyrene (Shroud) Steel +90°C -30°C M12 Metric -
RS Stock No. 914-9583
Mfr. Part No.GN.37466
BrandElesa
SGD25.15
Each
units
M20 Sight Glass - - - +180°C - M20 Metric Stainless Steel
RS Stock No. 283-3098
Mfr. Part No.13761
BrandElesa
SGD10.835
Each (In a Pack of 2)
units
G 1-1/4 Plug Level Indicator - - - +100°C - 1-1/4 in G Nitrile Rubber
RS Stock No. 283-3032
Mfr. Part No.13651
BrandElesa
SGD3.525
Each (In a Pack of 2)
units
G 1/4 Plug Level Indicator - - - +100°C - 1/4 in G Nitrile Rubber
RS Stock No. 283-3054
Mfr. Part No.13691
BrandElesa
SGD3.97
Each (In a Pack of 2)
units
G 1/2 Plug Level Indicator - - - +100°C - 1/2 in G Nitrile Rubber
RS Stock No. 196-2735
Mfr. Part No.S.690053
BrandParker
SGD46.14
Each
units
- Column Level Indicator 76mm - - +90°C -30°C - - -
RS Stock No. 914-9592
Mfr. Part No.GN.37468
BrandElesa
SGD24.00
Each
units
G 1/2 Sight Glass - - - +180°C - G 1/2 G Stainless Steel
RS Stock No. 283-3010
Mfr. Part No.11353
BrandElesa
SGD74.33
Each
units
M12 Column Level Indicator 80mm PA Based Polymer Stainless Steel +80°C -15°C M12 Metric -
RS Stock No. 283-3105
Mfr. Part No.14463
BrandElesa
SGD9.21
Each (In a Pack of 2)
units
G 1/2 Plug Level Indicator - - - +140°C - 1/2 in G Elastomer
RS Stock No. 283-3111
Mfr. Part No.14483
BrandElesa
SGD8.345
Each (In a Pack of 2)
units
G 3/4 Plug Level Indicator - - - +140°C - 3/4 in G Elastomer
RS Stock No. 914-9618
Mfr. Part No.GN.37547
BrandElesa
SGD19.76
Each
units
G 3/8 Sight Glass - - - +100°C - G 3/8 G Stainless Steel
RS Stock No. 914-9536
Mfr. Part No.110081
BrandElesa
SGD112.94
Each
units
- Column Level Indicator - PA Based Polymer - +80°C -30°C - - -
RS Stock No. 914-9450
Mfr. Part No.13672
BrandElesa
SGD4.05
Each
units
G 3/8 Sight Glass - - - +100°C - G 3/8 G -
RS Stock No. 914-9457
Mfr. Part No.13652
BrandElesa
SGD3.56
Each
units
G 1/4 Sight Glass - - - +100°C - G 1/4 G -
RS Stock No. 914-9621
Mfr. Part No.GN.37549
BrandElesa
SGD20.96
Each
units
G 1/2 Sight Glass - - - +100°C - G 1/2 G Stainless Steel
RS Stock No. 914-9630
Mfr. Part No.GN.37553
BrandElesa
SGD33.19
Each
units
G 1 Sight Glass - - - +100°C - G 1 G Stainless Steel