DeWalt DW0851 Instruction Manual Download Page 1

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INSTRUCTION MANUAL

WALT Industrial Tool Co., 701 East Joppa Road, Towson, MD 21286

WALT

DW0851

Self-Leveling 5 Beam Laser Pointer

IF YOU HAVE ANY QUESTIONS OR COMMENTS ABOUT THIS OR ANY D

WALT TOOL, CALL

US TOLL FREE AT:

1-800-4-D

WALT (1-800-433-9258)

Safety

WARNING:

To reduce the risk of injury, read the safety manual provided with your product

or access it online at

www.DeWALT.com.

Use of controls or adjustments or performance of procedures other than those specifi ed

herein may result in hazardous radiation exposure.

WARNING LABELS

For your convenience and safety, the following label is on your laser.

CAUTION: LASER RADIATION - DO NOT STARE INTO BEAM. CLASS 2 LASER

PRODUCT.

Laser Information

The DW0851 laser level is a class 2 laser product and complies with 21 CFR 1040.10 and 1040.11

except for deviations pursuant to laser notice No. 50, dated June 24, 2007.

PRODUCT OVERVIEW

The DW0851 laser level is a self-leveling laser tool that can be used for horizontal (level) and vertical

(plumb) alignment and square alignment. This tool comes fully assembled and has been designed

with features that allow for quick and easy set-up. Please read and understand all instructions within

this instruction manual in addition the Safety Manual prior to use.

Specifications

SPECIFICATIONS

Light Source

Semiconductor laser diode

Laser Wavelength

630–680 nm visible

Laser Power

<1.0 mW (each beam) CLASS 2 LASER PRODUCT

Working Range (Line)
Working Range (Dot)

±30' (10 m)
±100' (30 m)

±165'(50m) with detector

Accuracy* (Horizontal dots)

± 3/16" @ 50' (± 4.5 mm @ 15 m)

Accuracy* (Vertical up dot)

± 3/16" @ 50' (± 4.5 mm @ 15 m)

Accuracy* (Horizontal line)

± 1/8" @ 50' (± 3.0mm @ 15 m)

Indicators

Flashing Indicator: battery low
Flashing Laser: tilt range exceeded

Power Source

3 AA size batteries (4.5V DC)

Operating Temperature

20 °F to 120 °F (-10 °C to 50 °C)

Storage Temperature

-5 °F to 140 °F (-20 °C to 60 °C)

Environmental

Water resistant

Keypad, Modes and LED.

Power switch.

The Power ON/OFF switch is located on the rear of the tool as shown in figure 1 (A). When the

switch (A) is in the OFF/LOCKED position, the unit will remain off and the pendulum will be locked
When the on/off switch (A) is in the ON/UNLOCKED position, the unit will be powered ON, the

pendulum will be released from the locked position and self level.

Keypad.

The keypad located on the top of the tool as shown in figure 2 provides activation keys for

selection of laser dots and / or line function.

Low Battery Indicator.

The DW0851 is equipped with a low battery indicator on the keypad as shown in Figure 2. The

indicator light is located on the keypad. When the light flashes, the batteries are low and need to be

replaced. The laser may continue to operate for a short time while the batteries continue to drain.

After fresh batteries are installed and the laser is turned on again, the indicator light will remain

green.

Out of Level Indicator

The DW0851 is equipped with an out of level indicator on the keypad as shown in Figure 2. When
the tilt range (> 4° tilt) has been exceeded the LED will will turn on and falsh and the laser beam
will flash.
The flashing beam indicates the tilt range has been exceeded and the tool IS NOT LEVEL (OR

PLUMB) AND SHOULD NOT BE USED FOR DETERMINING OR MARKING LEVEL (OR PLUMB).

Try repositioning the laser on a more level surface.

Batteries & Power

Your laser tool requires 3 x AA batteries. (B)
Use only new, high-quality batteries for best results.

•

Ensure batteries are in good working condition. If the low battery indicator light is flashing, the

batteries need replacement.

•

To extend battery life, turn laser off when not working with or marking the beam.

Set Up

LEVELING THE LASER

This tool is self-leveling. It is calibrated at the factory to find plumb as long as it is positioned on flat

surface within 4° of level. As long as the tool is properly calibrated, no manual adjustments must

be made.

To ensure the accuracy of your work, check to make sure your laser is calibrated often. See

Field

Calibration Check.

• Before attempting to use the laser, make sure it is positioned securely, on a smooth, flat

surface.

• Always mark the center of the dot or pattern created by the laser.
• Extreme temperature changes may cause movement of internal parts that can affect accuracy.

Check your accuracy often while working. See

Field Calibration Check.

• If the laser has been dropped, check to make sure your laser is calibrated. See

Field Calibration

Check.

OPERATION
Turning the Laser On and Off (Fig. 3)

•

With the laser off, place it on a stable, flat surface. Turn the laser on by sliding on/off switch

(A) to the ON/UNLOCKED position.

•

Activate or deactivate the desired function using the keypad (C) located on top of the tool.

It will then project five beams; one up (D), one down (E), one horizontal to the left, (F), one

horizontal to the right (G), and one straight ahead (H) when the "DOT" key is pressed.

•

It will project a horizontal line from the rear window when the "LINE" key is pressed.

•

To turn the laser off, slide the the on/off switch (A) to the locked position.

The DW0851 is equipped with a locking pendulum mechanism. This feature is only activated when

the laser is switched off.

Using the Laser

The beams are level or plumb as long as the calibration has been checked (see

Field Calibration

Check

) and the laser beam is not flashing (see

Out of level Range Indicator

The tool can be used to transfer points using any combination of the five beams and/or horizontal

line.

OPERATING TIPS

To ensure the accuracy of your work, check to make sure your laser is calibrated often. See

Field

Calibration Check.

• Before attempting to use the laser, make sure it is positioned securely, on a smooth, flat

surface.

• Always mark the center of the dot or pattern created by the laser.
• Extreme temperature changes may cause movement of internal parts that can affect accuracy.

Check your accuracy often while working. See

Field Calibration Check.

• If the laser has been dropped, check to make sure your laser is calibrated. See

Field Calibration

Check.

INTEGRATED MAGNETIC PIVOTING BRACKET (FIG. 1 & 3)

The DW0851 has a magnetic pivoting bracket (I) permanently attached to the unit. This bracket

allows the unit to be mounted to any upright surface made of steel or iron using the magnets (J)

located on the back of the pivoting bracket. Common examples of suitable surfaces include steel

framing studs, steel door frames and structural steel beams. Position the laser on a stable surface.

CAUTION: Do not stand underneath the laser when it is mounted with the magnetic

pivoting bracket.