A liquid level gauge is a useful device for gauging, indicating or controlling the level of liquid in a tank or other storage units. You can buy mechanical level gauges, ultrasonic level gauges or magnetic level gauges according to the properties of stored liguid. For example, for corrosive liquids, ultrasonic gauges are more suitable.

Some of the important parameters you must consider before purchasing a liquid level gauge are:

1. Properties of the liquid such as corrosiveness, specific gravity and density
2. Required range of measurement for the liquid level gauge
3. Pressure and temperature rating of the liquid level gauge

Action Steps
The best contacts and resources to help you get it done

Buy tank level gauges from reputable liquid level gauge manufacturers

A tank level gauge is the best choice for measuring the level of liquid in small and medium-sized tanks. These gauges are generally contact-type mechanical gauges and are suitable for non-corrosive liquids.

I recommend: PresSure Products Company, a reputable manufacturer of level gauges, offers a variety of products including a tubular liquid level gauge and liquid level sight gauge. Krueger Sentry Gauge manufactures mechanical liquid level gauges that have direct or remote reading facility. Uehling Instrument is a specialty manufacturer that provides standard and customized fuel level gauges. ARCHON Industries provides a large range of observation equipment that includes a steel and brass liquid level sight gauge. John C. Ernst offers special types of level gauges such as a magnetic liquid level gauge, a brass vented gauge and a bronze tubular gauge.

Buy wireless liquid level gauges

For large capacity tanks that store corrosive liquids, you need to use wireless liquid level gauges.

I recommend: Varec provides wireless level gauges including hydraulic liquid level gauges and controller systems. Endress+Hauser and King Engineering also provide digital gauges and systems for wireless liquid level measurements.

Buy a liquid level gauge from retailers or distributors

You can compare different level gauges, their specifications and prices at retailers' and distributors' websites.

I recommend: ThomasNet offers a list of manufacturers and distributors of various liquid level gauges such as tank level gauges, digital level gauges and spiral liquid level gauges. Digi-Key is another retailer of industrial components including liquid level gauges. M.A. Selmon Company is another reputable distributor of level gauges of different brands. You can also refer to a list of liquid level gauge manufacturers at GlobalSpec.

Tips & Tactics

Helpful advice for making the most of this Guide

• •  Ensure proper battery backup and cable connections for an electronic liquid level gauge.
• •  Keep an inventory of level gauge components such as seals and adapters.