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
£25.07
Each
Units
- Column Level Indicator 161mm - - +90°C -30°C - - -
RS Stock No. 414-6481
Mfr. Part No.3723794
BrandWIKA
£18.68
Each
Units
G 1/2 Temperature & Level Indicator - - - +120°C 0°C 1/2 in G -
RS Stock No. 196-2763
Mfr. Part No.FL.69321
BrandParker
£31.21
Each
Units
- Column Level Indicator 254mm - - +90°C -30°C - - -
RS Stock No. 331-9559
Mfr. Part No.FL.69313
BrandParker
£24.68
Each
Units
M12 Column Level Indicator 202mm PA (Lens & Base), Polystyrene (Shroud) Steel +90°C -30°C M12 Metric -
RS Stock No. 331-9543
Mfr. Part No.FL69213
BrandParker
£21.69
Each
Units
M12 Column Level Indicator 74mm PA (Lens & Base), Polystyrene (Shroud) Steel +90°C -30°C M12 Metric -
RS Stock No. 283-2966
Mfr. Part No.11341
BrandElesa
£13.19
Each
Units
M10 Column Level Indicator 40mm PA Based Polymer Zinc Plated Steel +80°C -15°C M10 Metric -
RS Stock No. 331-9537
Mfr. Part No.FL69113
BrandParker
£18.09
Each
Units
M12 Column Level Indicator 30mm PA (Lens & Base), Polystyrene (Shroud) Steel +90°C -30°C M12 Metric -
RS Stock No. 196-2735
Mfr. Part No.S.690053
BrandParker
£21.50
Each
Units
- Column Level Indicator 76mm - - +90°C -30°C - - -
RS Stock No. 283-2972
Mfr. Part No.11351
BrandElesa
£15.48
Each
Units
M12 Column Level Indicator 80mm PA Based Polymer Zinc Plated Steel +80°C -15°C M12 Metric -
RS Stock No. 283-3076
Mfr. Part No.13721
BrandElesa
£2.485
Each (In a Pack of 2)
Units
G 3/4 Plug Level Indicator - - - +100°C - 3/4 in G Nitrile Rubber
RS Stock No. 283-3098
Mfr. Part No.13761
BrandElesa
£4.855
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. 283-3054
Mfr. Part No.13691
BrandElesa
£1.78
Each (In a Pack of 2)
Units
G 1/2 Plug Level Indicator - - - +100°C - 1/2 in G Nitrile Rubber
RS Stock No. 283-3026
Mfr. Part No.11363
BrandElesa
£51.71
Each
Units
M12 Column Level Indicator 203mm PA Based Polymer Stainless Steel +80°C -15°C M12 Metric -
RS Stock No. 283-3048
Mfr. Part No.13671
BrandElesa
£1.50
Each (In a Pack of 2)
Units
G 3/8 Plug Level Indicator - - - +100°C - 3/8 in G Nitrile Rubber
RS Stock No. 914-9441
Mfr. Part No.11355
BrandElesa
£33.15
Each
Units
M12 Column Level Indicator 80mm PA Based Polymer Stainless Steel +80°C -20°C 12 Metric -
RS Stock No. 283-3082
Mfr. Part No.13741
BrandElesa
£3.43
Each (In a Pack of 2)
Units
G 1 Plug Level Indicator - - - +100°C - 1 in G Nitrile Rubber
RS Stock No. 914-9457
Mfr. Part No.13652
BrandElesa
£1.58
Each
Units
G 1/4 Sight Glass - - - +100°C - 1/4 in G -
RS Stock No. 287-0160
Mfr. Part No.11101
BrandElesa
£3.91
Each (In a Pack of 2)
Units
G 1 Sight Glass - - - +110°C - 1 in G Nitrile Rubber
RS Stock No. 283-3004
Mfr. Part No.11343
BrandElesa
£32.83
Each
Units
M10 Column Level Indicator 40mm PA Based Polymer Stainless Steel +80°C -15°C M10 Metric -
RS Stock No. 283-2988
Mfr. Part No.11361
BrandElesa
£31.99
Each
Units
M12 Column Level Indicator 203mm PA Based Polymer Zinc Plated Steel +80°C -15°C M12 Metric -