pundit PI8000 Impact Echo Grid Mode User Guide

: June 13, 2024
: pundit

pundit PI8000 Impact Echo Grid Mode

pundit PI8000 Impact Echo Grid Mode

Keys – Overview

Device ON/OFF

Medium push (2s)| Power ON / OFF
Very Long push (8s)| Reboot device
During measurement
Short push| Arming the probe – start / resume measurement
Short push| Disarming the probe – stop measurement

Keys - Overview

Hammers

Ball Diameter, mm| Approximate Contact Time, μs| Maximum Useable Frequency, kHz| *Minimum Measurable Depth, mm**
---|---|---|---
5| 22| 47| 43
6| ?6| 39| 52
7| 30| 33| 60
8| 34| 29| 69
9| 39| 26| 77
10| 43| 23| 86
12| 52| 19| 103
15| 65| 16| 129
20| 86| 12| 172

This is the minimum thickness of a structural element than can be measured
It also refers to the minimum depth of a flaw that can be detected. All flaws above this depth will not be visible.

Select the smaller hammer for thinner elements, and the bigger hammer for wider elements

LED – Behaviour

LED behaviour

Battery Status (when turning on the device)| Green: single quick blink:

20%
Red: single quick blink: <20%
Turn on, awaiting Bluetooth connection| Green pulsing|
Connected, awaiting arming (disarmed)

Paused
Stopped

| Blue pulsing|
Armed

Resumed

batteries not charging / not inserted
Overvoltage / overheated

| Red solid|

One Sensor – Two Applications

Pile Integrity Test

Deep Foundations:

Cast in place piles.
Driven piles.

Detection:

Piles with free end.
Piles with toe in bedrock.
Short piles.
Necking.
Bulging.
Cracks and voids.

Impact Echo Test

Concrete elements:

Slab on grade.
Foundation slab.
Roof, floors.
Beams and columns.
Concrete pavement.
Walls.
Tunnels.

Detection:

Plate thickness and backwall.
Cracks and voids.
Delamination.
Honeycombs.
Debonding areas.
PT duct voids.

Contact Solution – Coupling material

Pile Integrity Test

Clean the surface from dirt and debris.
Grind the surface to make it smoother.
Place a small portion of putty (coupling material) in the sensor tip.
Change the portion of putty once it gets dirty.
Perform minimum 5-10 impacts per spot.

Impact Echo Test

Clean the surface from dirt and debris.
Grind the surface to make it smoother.
DRY CONTACT SOLUTION: Place a silicon sticker (coupling material) in the sensor tip and use it as many times as wanted.
Once it is broken, replace it with a new sticker and clean the sensor tip with the cleaning pen.
If coupling is not achieved, use putty.
Perform minimum 5-10 impacts per spot.

Technical Principle

Pile Integrity Test

Impact Echo Test

First calibration of speed

Pile Integrity Test

Select Pile Integrity Mode (0). – Input the expected length of the pile (1).
Perform 5
10 impacts at the top of the pile.
Press the calibration button (2).
Revise that the length shown on the app (3) matches with the expected one.
If the length of the element is not known, estimate a wave velocity of 4.000m/s.

Impact Echo Test

Select Impact Echo Spot / Grid mode (0) .
Input the expected thickness of the concrete element (1).
Perform 5
10 impacts in the surface far away from the sides (lateral faces, construction joints, etc).
Press the calibration button (2).
Revise that the thickness shown in the frequency peak (3) matches with the expected one.
If the thickness of the element is not known, estimate a wave velocity of 4.000m/s

A few examples

Pile Integrity Test

Pile with free end

Toe in bedrock

Short pile

Necking – reduction in diameter

Bulging – increase in diameter

*These examples are shown as a reference only and are valid theoretically. However, the signal from a real case scenario can differ and it is the responsibility of the inspector to correctly identify and interpret it.

Impact Echo Test

Cracks & Delamination

A few examples

Honeycomb

Voids in post tensioning duct

A few examples

Plates in contact with soil

A few examples

*These examples are shown as a reference only and are valid theoretically. The signal from a real case scenario can differ and it is the responsibility of the inspector to correctly identify and interpret it.

For more information on the product use of the product, please refer to the Product Name PI8000 documentation

It is available for download on

https://www.screeningeagle.com/en/products/pundit-pi8000

For safety and liability information, please download at https://www.screeningeagle.com/en/about-us/gtc-and-certificates Subject to change. Copyright © 2023 by Proceq SA, Schwerzenbach. All rights reserved.

Customer Support

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T +41 43 355 38 00

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