Tools / Laser Measuring Tools
Operating Instructions for Hilti PRA 20G Laser Receiver
A comprehensive guide for the Hilti PRA 20G laser receiver, covering setup, operation modes, settings, maintenance, and safety instructions.
Quick answers from the manual
Quick answer
- The PRA 20G is a laser receiver designed to detect laser beams from rotating lasers. It can be used hand-held or mounted on various supports. p. 9, 13
Key actions
- Insert batteries p. 11, 15
- Switch on/off p. 11, 15
First start
- Insert 2 AA batteries, ensuring correct polarity. p. 11, 15
Problems and fixes
Receiver not detecting laser
Ensure the receiver is in the plane of the rotating laser beam and the receiving window is clean.
p. 10, 14Maintenance and reset
- Clean with a soft, clean cloth. Use pure alcohol or water if necessary. p. 12, 16
Technical specifications
| Parameter | Value | Meaning | Pages |
|---|---|---|---|
| Detection range | 2-150 m | Typical range with PR 3-HVSG | p. 10, 14 |
| Protection class | IP 66 | Dust-tight and protected against powerful water jets | p. 10, 14 |
Where to find it in the PDF
- Operating Instructions p. 8, 12
- Technical Data p. 10, 14
Table of contents
Manual images
Click an image to enlargeQuick guide from the manual
The Hilti PRA 20G is a laser receiver designed to detect laser beams from rotating lasers. Before using the device, ensure you have read the safety instructions and understand the operation modes.
Description
The receiver features a receiving window, a control panel with buttons for power, units, and volume, and a display that indicates the receiver's position relative to the laser plane, battery status, and volume level.
Operation
The receiver can be used in several ways:
- Hand-held: Hold the receiver directly in the plane of the rotating laser beam.
- With PRA 80 holder: Secure the receiver in the holder and attach it to a telescopic or leveling staff.
- With PRA 83 holder: Push the receiver into the rubber sleeve and attach it to the grip section.
- With PRA 81 height transfer device: Insert the receiver into the device to transfer heights.
Settings
You can adjust the following settings:
- Units: Use the units button to set the desired accuracy (mm/cm/off).
- Volume: Press the volume button to select between Low, Normal, High, or Off.
- Menu: Press and hold the on/off button for two seconds during startup to access menu options for unit switching and signal tone assignment.
Care and Maintenance
Keep the receiving window clean and avoid touching it with fingers. Clean with a soft, clean cloth, using pure alcohol or water if necessary. Remove batteries before long-term storage or transport to prevent damage from leaks.
Manufacturer information
Hilti Corporation
Practical help
Common problems
Receiver not detecting laser
Ensure the receiver is in the plane of the rotating laser beam and the receiving window is clean.
Low battery indicator
Replace batteries (2x AA). Do not mix old and new batteries.
Inaccurate measurements
Check the receiver's accuracy after long storage or transport. Keep the receiving area clean.
Before use
- Check for damage
- Insert fresh batteries (check polarity)
- Clean the receiving window
- Ensure the receiver is in the laser plane
Specs in practice
- Detection range
- Typical range with PR 3-HVSG is 2-150m.
- Protection class
- IP 66 (dust-tight and protected against powerful water jets, except battery compartment).
- Automatic power off
- Turns off after 15 minutes without detection.
Images and diagrams
- Figure 1: Control panel layout
- Figure 2: Display indicators
- Figure 3: Battery installation
- Figure 4: Mounting with PRA 83, PRA 80, and PRA 81
Model compatibility
- Compatible with PR 3-HVSG and PRI 36 rotating lasers.
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.