The PWL measures the level or flatness of a solid surface or of large machinery either in setup or as a maintenance procedure. The patented design, system, and method give you the ability to do so quickly and accurately and its long range, versatility, and low cost make it an ideal addition to your tool set.
Specifically, the PWL can reduce the time you need to measure level and flatness on larger projects by 80% or more, without line of sight, and with an accuracy of +/- 0.0001 inches at up to 200 feet (+/- 2.5 µm at up to 61m) in controlled conditions (conditions which allow for measurement repeatability).
If you already have or are considering a laser leveling system or are familiar with using machinist levels, click here to learn about how they compare to PWLs. Simply put, PWLs are more accurate than 10 arc second machinist levels, exceed the accuracy of 1 and 2 arc second laser trackers at 3.5 feet and 2 feet respectively, far exceed the range of both, and do not require line of sight.
PWLs consist of small water cups connected with tubing and filled with water, which allows the water to settle to a virtual plane that mirrors the curvature of the earth. Measuring the level of water in the cups provides a direct-contact method of measuring the relative level or flatness of the surface(s) under the cups. While using water and gravity has been around for a long time, our patented design, system, and method are what give the PWL its accuracy and ease of use.
Despite the high accuracy, our customers love the PWL for its speed. You can take accurate measurements quickly and leave the PWL in place while you make adjustments, allowing you to check the effect of the adjustments you made shortly after making them. For example, let’s say you need to level a 20′ by 100′ piece of equipment with 40 adjustment points (load levelers) to a tolerance of 0.001 inches. You would place one PWL water cup over each adjustment point (40 total) connected with ~240 feet of tubing. After setup, take all 40 measurements using the PWL’s modified micrometer (~60 minutes), compare them to each other factoring in the curvature of the earth using the table provided (~20 minutes), make all of your adjustments, let the water settle (~15 minutes), and take your measurements again. In other words, the time between making adjustments across the entire surface is less than 1.5 hours versus several days or a week with other measurement methods. In addition, mistakes are not costly; if you find you need to retake a set of measurements, you’ve added less than 1.5 hours to your project time in this example.
Additional benefits are that the PWL:
- Is relatively inexpensive (our kits are less than 10% the price of a laser tracking system with some models comparable to the cost of a machinist level, resulting in a much faster ROI; additional cups and micrometer assemblies are discounted when purchased with a kit)
- Requires minimal training (approximately 30 minutes)
- Is durable (the tool is well built and damage to one water cup does not preclude the use of the remaining cups)
- Does not require line of sight and includes its own power and lighting
- Is quick to setup (less than one hour in most cases) and stays in place throughout the leveling process
- Is portable (the heaviest 8-cup model weighs ~25 pounds)
- Can be used to measure a movable surface (the level or flatness of the surface and its overall elevation drop at different locations)
- Is intuitive (users quickly grasp the concept and when it doubt, can easily test the system using a precision shim placed under one cup)
For more information, please contact us.