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
$67.64
Each
units
- Column Level Indicator 161mm - - +90°C -30°C - - -
RS Stock No. 196-2763
Mfr. Part No.FL.69321
BrandParker
$72.28
Each
units
- Column Level Indicator 254mm - - +90°C -30°C - - -
RS Stock No. 414-6481
Mfr. Part No.3723794
BrandWIKA
$44.37
Each
units
G 1/2 Temperature & Level Indicator - - - +120°C 0°C 1/2 in G -
RS Stock No. 331-9543
Mfr. Part No.FL69213
BrandParker
$53.71
Each
units
M12 Column Level Indicator 74mm PA (Lens & Base), Polystyrene (Shroud) Steel +90°C -30°C M12 Metric -
RS Stock No. 914-9432
Mfr. Part No.11352
BrandElesa
$34.93
Each
units
M12 Column Level Indicator 80mm PA Based Polymer Zinc Plated Steel +80°C -30°C 12 Metric -
RS Stock No. 196-2735
Mfr. Part No.S.690053
BrandParker
$50.23
Each
units
- Column Level Indicator 76mm - - +90°C -30°C - - -
RS Stock No. 283-2972
Mfr. Part No.11351
BrandElesa
$37.23
Each
units
M12 Column Level Indicator 80mm PA Based Polymer Zinc Plated Steel +80°C -15°C M12 Metric -
RS Stock No. 914-9577
Mfr. Part No.111031-NP
BrandElesa
$76.63
Each
units
M12 Column Level Indicator 198mm - Zinc Plated Steel +100°C -30°C 12 Metric -
RS Stock No. 914-9643
Mfr. Part No.GN.37555
BrandElesa
$44.58
Each
units
G 1-1/4 Sight Glass - - - +100°C - 1-1/4 in G Stainless Steel
RS Stock No. 914-9646
Mfr. Part No.GN.37556
BrandElesa
$41.06
Each
units
M42 Sight Glass - - - +100°C - M42 x 1.5 Metric Stainless Steel
RS Stock No. 283-3004
Mfr. Part No.11343
BrandElesa
$75.19
Each
units
M10 Column Level Indicator 40mm PA Based Polymer Stainless Steel +80°C -15°C M10 Metric -
RS Stock No. 914-9583
Mfr. Part No.GN.37466
BrandElesa
$26.23
Each
units
M20 Sight Glass - - - +180°C - M20 x 1.5 Metric Stainless Steel
RS Stock No. 283-3010
Mfr. Part No.11353
BrandElesa
$74.85
Each
units
M12 Column Level Indicator 80mm PA Based Polymer Stainless Steel +80°C -15°C M12 Metric -
RS Stock No. 914-9589
Mfr. Part No.GN.37464
BrandElesa
$24.26
Each
units
G 3/8 Sight Glass - - - +180°C - 3/8 in G Stainless Steel
RS Stock No. 914-9435
Mfr. Part No.11342
BrandElesa
$28.98
Each
units
M10 Column Level Indicator 40mm PA Based Polymer Zinc Plated Steel +80°C -30°C 10 Metric -
RS Stock No. 914-9533
Mfr. Part No.111001
$57.83
Each
units
M10 Column Level Indicator 42mm - Zinc Plated Steel 100°C -30°C 10 Metric -
RS Stock No. 287-0148
Mfr. Part No.10901
BrandElesa
$4.605
Each (In a Pack of 2)
units
G 1/2 Sight Glass - - - +110°C - 1/2 in G Nitrile Rubber
RS Stock No. 914-9558
Mfr. Part No.111014
BrandElesa
$82.45
Each
units
M12 Column Level Indicator 71mm - Zinc Plated Steel +100 °C, +130°C -30°C 12 Metric -
RS Stock No. 283-2966
Mfr. Part No.11341
BrandElesa
$29.58
Each
units
M10 Column Level Indicator 40mm PA Based Polymer Zinc Plated Steel +80°C -15°C M10 Metric -
RS Stock No. 914-9573
Mfr. Part No.111021-NP
BrandElesa
$65.45
Each
units
M12 Column Level Indicator 120mm - Zinc Plated Steel +100°C -30°C 12 Metric -