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L-740 Leveling Laser System


L-740 Leveling Laser System

Split Joint Leveling System

Measuring split or horizontal joints during an outage can take hours and hold up other critical work on the turbine. Traditionally split joints are measured with transits and usually require at a 2-man crew. The measurements rely on the human eye and are subject to interpretation by the operator, an inexact science.

The L-740 Ultra-Precision Leveling Laser was designed for high-accuracy leveling applications. It is accurate to about 1/4 of an arc second or 0.000015"/ft (0.001 mm/M) accuracies. It is an extremely portable and very affordable alternative to traditional leveling methods like theodolites or transits. Its automatically sweeping laser plane and large-range targets with 0.0005" (.0125 mm) resolution create a powerful tool for quickly aligning almost any surface or machine bed.

High Accuracy Reduces Optics Guesswork

Hamar Laser's L-740 is accurate to +/-.0015" (.04 mm) in 100 feet (30.5 meters) or +/-.0001" (.0025 m) in 10 feet (3 M) under good atmospheric conditions. This accuracy turns the alignment process from an art using optics to a science using lasers. Optics can be considered an art because each operator "sees" the readings differently and essentially has to make an educated guess as to the correct number. With the L-740, this guesswork is eliminated because the target electronics determine the alignment reading.

Reduce Alignment Work Crews

The L-740 only requires one operator, even on the very largest jobs. That frees up critical manpower to perform other tasks on the outage, helping to reduce the duration of the outage. In fact, the same technician can operate the L-740 Leveling System and the L-705 Bore Alignment Laser for turbine diaphragm and seal alignments.

Minimal Training Needed

The L-740 is so easy to use that it usually only requires 1 day of training and if our Plane5 software is purchased then it only adds 1 day to the training. Compared with optics where training can last up to 2 weeks, the L-740 can significantly reduce the time critical technicians are out of action when being trained.

Multiple Targets for Fast Split Joint Measurements

The L-740 Leveling Laser System can use multiple targets, which really speeds the data-taking process for split (horizontal) joints. In fact, up to 4 targets can be used simultaneously. The combination of automatically rotating lasers and multiple targets can easily reduce split-joint measurement time by 50% or more.

Wireless Targets and Readouts

With Hamar's new line of wireless targets (A-1519-2.4ZB / A-1520-2.4ZB) there is no need to string long extension cords to reference targets. The targets have up to a 3" (76 mm) measuring range and can be used up to 100 (30.5 M) feet from the readout. Other features like electronic zeroing help to speed setup.

Most Accurate Mechanical Levels Available

The L-740 Laser uses level vials that are accurate to 1 arc second (0.00006"/ft or 0.005 mm/M). Only expensive, difficult-to-use, and fragile electronic levels are more accurate. The combination of accurate levels and automatically rotating laser planes creates an alignment tool that is hard to beat.

Color Windows Software

The L-740 can also be linked to our new Plane 5 flatness analyzing software. It is a Windows 95/98 based software that can analyze almost any layout for flatness or straightness. Plane 5 will even analyze squareness if used with our squareness lasers (L-743, L-742, L-741, L-733 and L-732 ). Squares, rectangles, frames, circles, rings, and up to four sets of ways can all be easily analyzed with Plane 5. The alignment data is automatically downloaded by using our wireless data receiver, the A-910-2.4ZB.

Data Sheet
Application note
How it Works
General Leveling


  • Continuously rotating diode laser with 100 (30.5 meters) radius operating range.
  • Instant on with virtually no warm up.
  • Setup in as little as 5 minutes.
  • Laser planes flat to ½ an arc second (0.00003"/ft or 0.0025mm/M) in 180º sweep and 1/4 arc second (0.000015"/ft or 0.001 mm/M) in 90º sweep.
  • Laser base includes pitch and roll adjustments.
  • Precision level vials accurate to 1 arc second (0.00006"/ft or 0.005 mm/M).
  • Standard Target: A-1519-2.4ZB Single-Axis Wireless Target with 0.0005" (0.013 mm) Resolution.
  • Uses A-1520-2.4ZB Single-Axis Wireless Target with 0.0001" (0.0025 mm) Resolution for higher accuracy applications.
  • Live data display.
  • Laser and target fit into a small, portable shipping case.
  • Uses A/C adapter or battery pack.
  • Windows 95/98 software quickly records and analyzes flatness data.
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