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. 414-6481
Mfr. Part No.3723794
BrandWIKA
€24.05
Each
units
G 1/2 Temperature & Level Indicator - - - +120°C 0°C 1/2 in G -
RS Stock No. 196-2757
Mfr. Part No.FL.69221
BrandParker
€32.59
Each
units
- Column Level Indicator 161mm - - +90°C -30°C - - -
RS Stock No. 196-2763
Mfr. Part No.FL.69321
BrandParker
€40.58
Each
units
- Column Level Indicator 254mm - - +90°C -30°C - - -
RS Stock No. 283-3026
Mfr. Part No.11363
BrandElesa
€62.37
Each
units
M12 Column Level Indicator 203mm PA Based Polymer Stainless Steel +80°C -15°C M12 Metric -
RS Stock No. 196-2735
Mfr. Part No.S.690053
BrandParker
€27.96
Each
units
- Column Level Indicator 76mm - - +90°C -30°C - - -
RS Stock No. 331-9537
Mfr. Part No.FL69113
BrandParker
€23.53
Each
units
M12 Column Level Indicator 30mm PA (Lens & Base), Polystyrene (Shroud) Steel +90°C -30°C M12 Metric -
RS Stock No. 914-9558
Mfr. Part No.111014
BrandElesa
€51.21
Each
units
M12 Column Level Indicator 71mm - Zinc Plated Steel +100 °C, +130°C -30°C 12 Metric -
RS Stock No. 914-9536
Mfr. Part No.110081
BrandElesa
€69.11
Each
units
- Column Level Indicator - PA Based Polymer - +80°C -30°C - - -
RS Stock No. 914-9444
Mfr. Part No.11362
BrandElesa
€45.74
Each
units
M12 Column Level Indicator 203mm PA Based Polymer Zinc Plated Steel +80°C -30°C 12 Metric -
RS Stock No. 914-9612
Mfr. Part No.GN.37548
BrandElesa
€11.55
Each
units
M16 Sight Glass - - - +100°C - M16 x 1.5 Metric Stainless Steel
RS Stock No. 331-9543
Mfr. Part No.FL69213
BrandParker
€28.18
Each
units
M12 Column Level Indicator 74mm PA (Lens & Base), Polystyrene (Shroud) Steel +90°C -30°C M12 Metric -
RS Stock No. 287-0154
Mfr. Part No.11001
BrandElesa
€7.43
1 Pack of 2
Pack(s)
G 3/4 Sight Glass - - - +110°C - 3/4 in G Nitrile Rubber
RS Stock No. 283-3010
Mfr. Part No.11353
BrandElesa
€40.56
Each
units
M12 Column Level Indicator 80mm PA Based Polymer Stainless Steel +80°C -15°C M12 Metric -
RS Stock No. 914-9454
Mfr. Part No.13692
BrandElesa
€2.52
Each
units
G 1/2 Sight Glass - - - +100°C - 1/2 in G -
RS Stock No. 914-9533
Mfr. Part No.111001
€33.89
Each
units
M10 Column Level Indicator 42mm - Zinc Plated Steel 100°C -30°C 10 Metric -
RS Stock No. 914-9542
Mfr. Part No.111004
€46.87
Each
units
M10 Column Level Indicator 42mm - Zinc Plated Steel +100 °C, +130°C -30°C 10 Metric -
RS Stock No. 283-2988
Mfr. Part No.11361
BrandElesa
€43.67
Each
units
M12 Column Level Indicator 203mm PA Based Polymer Zinc Plated Steel +80°C -15°C M12 Metric -
RS Stock No. 914-9586
Mfr. Part No.GN.37462
BrandElesa
€13.76
Each
units
M16 Sight Glass - - - +180°C - M16 x 1.5 Metric Stainless Steel
RS Stock No. 914-9599
Mfr. Part No.GN.37472
BrandElesa
€18.19
Each
units
G 3/4 Sight Glass - - - +180°C - 3/4 in G Stainless Steel
RS Stock No. 914-9595
Mfr. Part No.GN.37470
BrandElesa
€19.80
Each
units
M26 Sight Glass - - - +180°C - M26 x 1.5 Metric Stainless Steel