SENSIT Technologies ULTRA-TRAC APL User manual

ACOUSTIC PIPE LOCATOR
ULTRA-TRAC®APL
INSTRUCTION MANUAL
READ AND UNDERSTAND INSTRUCTIONS BEFORE USE
851 Transport Drive
Valparaiso, IN 46383-8432
Phone: [phone]
219 465 2700
Fax: [phone]
Email: [e-mail]
Web: www.gasleaksensors.com

3
Instruction Manual
Section Title .......................................... Page
General Description................................ 4
Safety and Care...................................... 4
What is Included..................................... 5
Replacement Parts................................. 5
Specications ......................................... 5
Principle of Operation............................. 6
Summary of Operation ........................... 7
Control Tablet & Chassis Features ......... 8
Battery Charging..................................... 8
Operation of Instrument.......................... 9-11
Scan View Feature Details ..................... 12
Plot Menu ............................................... 13
Settings Menu......................................... 14
Supervisor Settings Menu ...................... 15
Scan Options.......................................... 16
Survey View............................................ 17
Depth Chart ............................................ 18
What to Avoid, How to Turn O󰀨 .............. 19
Performing a Locate ............................... 20-21
Maintenance........................................... 22
Warranty ................................................. Back Cover
ULTRA-TRAC®APL
ACOUSTIC PIPE LOCATOR

4
General Description
The Ultra-Trac® APL is an acoustic pipe locator designed to locate
piping systems constructed of any material including (but not limited
to): plastic, metal, clay, concrete, berglass, cast and ductile iron. The
piping systems can also be located regardless of the type of surface
above the pipe such as gravel, soil, grass, concrete or asphalt.
The Ultra-Trac® APL uses a highly specialized acoustic transducer
(actuator) technology that requires coupling with the ground surface
to send signals into the ground. Highly sensitive accelerometers
sense the reected energy. The data is processed and converted into
easy to understand results on the display. There is no connection to
the piping system required with the Ultra-Trac® APL.
The Ultra-Trac® APL is not a󰀨ected by electrical elds or overhead
power systems. The system incorporates noise ltering technology
that eliminates false readings due to tra󰀩c or equipment that may be
operating in the area of the test.
Safety and Care
• Follow your company and other applicable safety procedures when operating this device.
• Do not place this instrument in areas where live electrical power may be present.
• Do not open the housings at any time unless factory authorized to perform service.
• Do not use in the presence of hazardous gases or chemicals.
• Follow Federal, State and local regulations when disposing of any batteries.
• Do not immerse this product in water.
• Keep in the provided case when not in use or during shipping to reduce the chance of damage.
Ultra-Trac APL Instruction Manual

5
What is included:
• Ultra-Trac® APL with carrying case (926-00000-01)
• Recharging adapter (871-00029)
• Measuring tape (360-00342)
• Instruction Manual (750-00072)
• Quick Start Guide (750-00073)
Replacement Parts:
• Actuator plate (360-00326)
• Accelerometer housing (360-00320)
• Carrying Case (872-00016)
• APL Charger (871-00029)
• Tablet (360-00487)
• Dampening Pads (310-00061)
• Tablet Support Bracket Assembly (870-00087)
• USB Cable (360-00500)
Specications:
• Size (inches): Handle 48; Base 20” X 10” X 10” (L x W x H)
• Weight: 26 LBS
• Operational Temp: -4°F to 122°F (-20°C to 50°C)
• Storage Temp: -20°F to 140°F (-29°C to 60°C)
• Battery life
Base: 25 hours
Tablet: 6 hours
• Battery type
Base: 16vdc Lithium-ion
Tablet: 7.4vdc Lithium-ion
• Recharge time
Base: 10 hours
Tablet: 3 hour
• Time per slice: <2 seconds
• Time per 20 slice scan: <2 minutes
Detection Specications:
• Time per 10x10 foot grid with 6-inch slice distance time = 10 minutes
• 1/2” ID pipe ≤30” depth
• 2” ID pipe ≤ 48” depth
• 4” ID pipe ≤96” depth
• Accuracy: better than ±18” from edge of pipe.
• Time Conversion Chart is used to estimate relative depth based on site conditions
• Detects any pipe material regardless of soil type

6
Principle of Operation
The Ultra-Trac® APL locates pipe through acoustic
impedancemismatch.The speed of sound throughground
materials di󰀨ers from pipe material. This makes the pipe
detectable using the Ultra-Trac® APL. The acoustic wave
pattern of specic timing and frequency is monitored and
processed using the device’s accelerometers. Based on
the return signature the instrument will determine if a
pipe is present within the minimum requirements as set
in the software.
The Ultra-Trac® APL is set on the ground. The manner
in which the operator uses the device is critical to create
proper coupling with the ground. The scan button is
pushed to send a signal (set of pings) into the ground.
The pings last approximately 2 seconds. This is called a
slice. The operator then moves the APL 6” or 12” either to
the right or left so another slice can be performed. After
taking a minimum of 5 slices, a button on the tablet is
pressed to plot results of the scan. Multiple scans create
a survey (the nal result for locating the piping system).
By comparing all the scan data from the survey, the user
can then determine a best t line and locate the pipe in
question. A pattern indicates likely target line location.
Obstacle (Pipe)
Reective Wave Transmitted Wave
Ground Surface

7
Scan Row 1
Scan Row 2
Scan Row 3
Scan Row 4
Scan Row 5
Scan Row 6
Scan Row 7
Scan Row 8
Scan Row 9
Slice
1
Slice
2
Slice
3
Slice
4
Slice
5
Slice
6
Slice
7
Slice
8
Slice
9
Scan Row 1
Scan Row 2
Scan Row 3
Scan Row 4
Scan Row 5
Scan Row 6
Scan Row 7
Scan Row 8
Scan Row 9
Slice
1
Slice
2
Slice
3
Slice
4
Slice
5
Slice
6
Slice
7
Slice
8
Slice
9
= Pipe Found (Marked)
= 1 Slice
Example Grid Plan:
9 Scan Rows
9 Slices Per Row
Summary of Operation:
1. The APL is placed on the ground such that scans will be taken at a 90-degree angle to the
believed path of the target line.
2. Proper ground contact (coupling) is established.
3. With each push of the scan button, the actuator sends a set of “pings” into the ground
4. Receiver (Accelerometers) listens for reected ping.
5. Strength, speed and duration of the reected pings are monitored.
6. Each activation of the transmitter and receiver device is called a “slice”.
7. A series of at least 5 slices, followed by plotting creates a display result called a scan.
8. A single scan row is not a full search. A minimum of 3 scan rows are required before a plot can be
rendered that shows enough information to determine pipe locations.

8
Control Tablet and Mount Features
Chassis Features
The bottom of the instrument is referred to as the chassis.
The chassis houses a battery, the components and
electronics to operate, the actuator and accelerometers,
the battery charging port, the handle connection, locking
mechanism, and the kickstand.
Battery Charging (Chassis)
1. Open the box containing the charger and the assortment of wall plug adapters. Install the proper adapter
for your global requirement.
2. With the instrument o󰀨 remove the cover from the battery charge port located on the left side of the
chassis.
3. Insert the charge adapter and secure by rotating the locking ring clockwise to prevent accidental
disconnection. Do not over tighten.
4. The green light on the power switch will illuminate indicating there is a connection.
5. The red light will begin ashing within 60 seconds indicating charging is in progress.
6. A solid red light indicates charge is complete.
Battery Charging (Tablet)
1. Open the box containing the charger and the assortment of wall plug adapters. Install the proper adapter
for your global requirement. (Note: Only a U.S. wall plug is included with the tablet. An additional wall
plug adaptor for your specic geographical location may be required.)
2. With the instrument o󰀨 remove the cover from the battery charge port located on the bottom left of the
tablet.
3. Insert the charge adapter.
4. The battery charge indicator on the right side of the screen glows yellow while the battery is charging. It
glows green when the battery is fully charged.
WARNING: Do not attempt to service this battery unless authorized by the factory.
Doing so may void the warranty.
Display
Speaker
On/Off Button
Charging
Indicator
Scan Button
The control tablet is mounted at the end of the
handle and is positioned so the display, on/o󰀨
button, speaker, charging indicator and scan
button are directed toward the user.

9
Operation of Instrument – Out of the Box
Refer to the “Performing a Locate” section for details of suggested site preparation prior to starting
measurements.
Unfold the Handle
Unfold and lock the handle in the upright position using
the locking pin. The locking pin is held in place using a
¼ turn action.
1.
Extend the Kickstand
Extend the kickstand downward from the front to
support the instrument.
2.
Power ON
Note: The tablet and Chassis have separate power
sources. Both need to be turned on before the APL will
be able to function properly.
Chassis
Press the power button until a beep is heard and
release. A green light will ash 30 – 45 seconds. Once
the green LED is solid the chassis is ready for use.
Tablet
Press the green power switch. The small blue LED in
the upper left of the display will immediately illuminate
followed by full display graphics within 30 sections.
The APL application should automatically start.
3.

10
Operation of Instrument
4. Prepare to take measurements (Scan View)
Once both the chassis and tablet are on and the tablet has the APL application displayed, press the soft
button “Connect to APL”. The tablet will take a moment to connect, when the connection is established
the button will turn green and display the message “APL Connected”.
5. Initial Scan Settings
The APL will automatically step the user through Scan Settings when the device is
rst powered on.
A. Select a Surface
Select the surface type by choosing Soft or Hard in the lower right of the tablet display.
Soft is for grassy or loose surfaces. Hard is for concrete, hard soil, rock and asphalt.
B. Select a Depth
Select depth by choosing Deep or Normal.
Normal is used for up to 5 ft (1.5m) depths. Deep is used for depths greater than 5 ft (1.5m) or for pipes
greater than 2” (5cm) in diameter.
C. Select Step Direction
Select the desired direction of travel you wish to perform slices by choosing the left or right arrow.
D. Select Distance
Select the desired distance per slice. Six inch slices are recommended for most applications as they
provide for a high-resolution scan. All readings are to the nearest slice width plus or minus ±18 inches
from the outer edge of the utility line.

11
Operation of Instrument
6. Prepare to Take First Reading
Observe the sensor status in the upper right corner of the display. This indicates the accelerometers
are ready for a reading. The sensor status should read “OK, OK” indicating that both accelerometers
are functioning properly. A “plus sign (+)” indicates overvoltage and a “minus sign (-)” indicates an under
voltage at the accelerometer. Call Sensit if you persistently get “+” or “- “indications.
The top line will also indicate all user selectable parameters.
Press down on the handle and foot platform. Press the scan button
to start the process of collecting data for a slice. If the unit beeps
three times the coupling to the ground is not good. Reposition the
device a bit and ensure you are pressing with su󰀩cient pressure
on both the handle and foot platform. Repeat pressing the scan
button.
7. Plotting a Scan
After taking at least 5 slices press the button containing the word
“Plot” in the lower right of the tablet screen. This will generate
a display of the processed data on the axes in the center of the
display. A maximum of 26 slices can be taken per scan. Pressing
the button containing the word “New” will prepare the APL for
beginning a new scan.
8. Saving a Scan
After plotting the data, the user has the options to save the raw data as well as the plot as two separate
les. The plot can be saved by pressing the button containing the words “Save Plot” on the right of
the screen. This will create a jpeg image (screengrab) of the current data for use in a report and client
deliverables. To save the raw data, press the button containing the words “Save Data”. This will save the
raw data in a format that can be plotted in a volumetric cube in the Survey View mode of the application.
NOTE: RAW DATA MUST BE SAVED IN ORDER TO USE SURVEY VIEW MODE.
Scan Results are displayed in the Cartesian plane (axes) in the center of the display. The color scale
corresponds to the signal intensity (signal strength) displayed in the plot. A bright yellow color indicates
a high signal return, while a dark blue color indicates little or no signal returned. The x-axis corresponds
to slice number, or distance from starting point. The y-axis corresponds to the two-way travel time of the
signals being displayed. This time is directly proportional to the depth of the object causing the reected
signal.
Push Handle
Forward
Step On
Foot Pad

12
Scan View Feature Details
Scan View
Scan view is the default operating mode and is useful for collecting and viewing raw data in real time, and is
used to mark locations in the eld.
Connect to APL/APL Connected
Same button depending on the state of the APL. Connect to APL: Establishes communication between tablet
application and the APL base. APL Connected: Indicates status of APL communication between tablet and
base. Button has green background.
Disconnect
Press the disconnect button to terminate communication between the APL and the tablet.
Settings
Press the “Settings” button to access the APL Settings Menu. From this menu the user can change the units
between “in” and “cm” and access the password protected Supervisor Menu.
Upper Threshold
Adjusts the upper limit of the color scale to lter out unwanted noise and comparing signal strengths in di󰀨erent
areas.
Lower Threshold
Adjusts the lower limit of the color scale to lter out unwanted noise and comparing signal strengths in di󰀨erent
areas.
Menu
Allows the operator to adjust user parameters based on site conditions.

13
Menu Tree
Plot Menu Tree
Save Data
Press the “Save Data” button in order to save the raw data required to utilize Survey View. File names
will have the default value of “YYYYMMDD_hhmmss.mat” where Y represents the year, M represents
the month, D represents the day, h represents the hour (24-hour clock), m represents the minute, and s
represents the second that the data le was created. This le name can be changed to any alphanumerical
value. For example: “Water Line 1”.
Save Plot
Press the “Save Plot” button in order to save a screenshot of the current data as it is displayed in the axes.
This will only save an image le, and will not save the data required to operate Survey View. Any changes
made to the upper or lower threshold values will be reected in the saved image le. This is useful for
incorporating in a report as a client deliverable or job le.
g.
Settings
ExitThisMenu Units:__ SupervisorSettings
ExitThisMenu
All h b ##
EnterPassword
inch
cm
ROIStart##
ROIEnd##
ROIStart(DEEP)##
ROI End (DEEP) ##
All
owsyoutoc
h
angenum
b
er
##
Allowsyoutochangenumber##
Allowsyoutochangenumber##
Allows you to change number ##
ROI

End

(DEEP)

##
ResettoFactoryDefaults
PowerUpResetEnabled
Allows

you

to

change

number

##
Yes
Yes
Back
No
ExitsSettings

14
Menu Tree
Settings Menu Tree g.
Units - Change slice unit of measure (in or cm)
g.
Options
(
while in scan mode
)
(
while

in

scan

mode
)
ContinueScan
SwitchScanDirection
Exitsfromoptionsmenu
RestartScan
NewSettings
RedoLastReading(onlyavailableduringascan)Repeatsthelastslice
Options
(whileinscanmode)
ConnecttoAPL EstablishescommunicationbetweentabletapptoAPLbase
APLConnected IndicatesstatusofAPLcommunicationbetweentabletand
base.Buttonhasgreenbackground.Doesnotrespondto
userbuttonpresses
Disconnect Disconnectscommunication
ofAPLtabletfromAPLBase

15
Supervisor Settings Menu
The Supervisor Settings should not be changed without rst consulting the manufacturer. The Supervisor
Settings Menu contains adjustments for how the APL analyzes the received signals. Supervisor Menu is
password protected.
Region of Interest (ROI)
First, there is the Region of Interest (ROI). This adjustment consists of four settings, ROI Start and ROI
End, ROI Start (Deep), and ROI End (Deep).
The rst pair of ROI settings correspond to the Normal Depth mode, while the second pair of ROI settings
correspond to the Deep Depth mode. These settings adjust the time frame of the signal that the APL will
include in the detection algorithm.
For instance, If the ROI start is set to 18ms and the ROI end is set to 42 ms, only the signal received
between 18 and 42 ms after each ping will be processed. This adjustment plays a role in how deep in the
ground the APL will look for a pipe. The deeper a pipe is located, the longer it will take for a signal to return
to the accelerometers. Therefore, by adjusting the time frame in the ROI, one can e󰀨ectively change how
deep the APL is scanning for buried pipe. One must be reminded that a later ROI start time value will result
in lower returned signal strength due to signal attenuation in the soil.
Region of Interest (ROI) - Normal Depth Mode Settings
Adjustment for ROI is for the experienced user looking for piping that may be outside the default depth range
established during development. The ROI for Normal Mode corresponds to the 900hz transmit frequency.
Start is 15ms
End is 39ms
Region of Interest (ROI) - Deep Depth Mode Settings
The ROI for Deep Mode corresponds to the 500hz transmit frequency.
Start is 18ms
End is 60ms
Reset to Factory Defaults
Also included in the supervisor settings are the “Reset to Factory Defaults” and the “Power up Reset
Enable” options. By selecting “Reset to Factory Defaults” the APL will be returned to the original settings
and any adjustments made by the user will be overwritten.
Power up Reset Enabled
If the Power up Reset is set to enable, the user will be prompted to either keep or discard any custom
settings upon each initialization of the unit. If Power Up reset is disabled, any changes will be kept until
further changes are made or a factory reset is performed.

16
Scan Options (while in scan mode)
g.
l
P
l
ot
(availableafteratleast5slices)
Shows2Ddisplayofdata
SaveData
SavePlot
Exitsfromoptionsmenu
New
Yes
Back
“ScanwithSameSettings?”
Allows user to start new scan w/o
Allowsusertoselectnewscansettings
Yes
No
Allows

user

to

start

new

scan

w/o
changingsettings
Survey View
After completing a number of scans at a common location, Survey View Mode can be used to view all
similar 2D scans (same scan direction, depth mode, and step distance) scans in a three-dimensional
space, displayed in a volumetric cube. After a number of scans have been saved to the tablet, they can
quickly be compared using the Survey View mode of the application. With Survey View, the user is able
to generate a simulated three-dimensional model of the survey using the data collected by the APL. This
feature of the application does require that the scans be taken from the same reference line, and in the
same distance intervals in order to properly correlate the slices of each scan.
Upon pressing the “Survey Mode” button at the top of the screen, a set of axes and a new set of controls
will appear.
Survey View is selectable by pressing the button containing the words “Survey View” in the top-left
corner of the display. Survey View is useful for comparing a number of scans collected in a common
location using common parameters. Using Survey View it is possible to construct a three-dimensional
image of the raw data.

17
Survey View
g.
Page 11
Scan View Feature Details
Scan View – Scan view is the default operating mode and is useful for collecting and viewing
raw data in real time, and is used to mark locations in the field.
Connect to APL/APL Connected – Same button depending on the state of the APL. Connect to
APL: Establishes communication between tablet application and the APL base. APL Connected:
Indicates status of APL communication between tablet and base. Button has green background.
Disconnect – Press the disconnect button to terminate communication between the APL and the
tablet.
Settings – Press the “Settings” button to access the APL Settings Menu. From this menu the
user can change the units between “in” and “cm” and access the password protected Supervisor
Menu.
Upper Threshold – Adjusts the upper limit of the color scale to filter out unwanted noise and
comparing signal strengths in different areas.
Lower Threshold - Adjusts the lower limit of the color scale to filter out unwanted noise and
Press the “Select Folder” button and navigate to the directory containing the APL data collected during the
survey (Defaults to /Program Files/APL/data/). After selecting the proper folder, the list box on the left will
be populated with the list of .mat les containing the data collected during the survey. Note that the le data
eld will appear blank until a folder is selected.
In order to add data to the plot, highlight the .mat le and press the “Add to Plot” button. As les are added,
they will appear in the list box on the right.
After all of the desired les have been added, press the “Plot Survey” button to plot a scan by scan
representation of the survey. The plot will start o󰀨 in a view of the X-Y plane or scan number vs time plane.
Use the arrows in the axis controls box to change the view angle.
The entire survey has now been adjusted to one color scale. This color scale can be visualized by selecting
the “Color Bar” radio button. The lower and upper thresholds of this color scale can be adjusted using the
+/- buttons in the lower and upper threshold adjustment panels. The reset buttons will reset each respective
threshold to its original value.
It is also possible to generate interpolated data in order to help visualize how each scan relates to the next
by selecting the “Scan Interpolation” radio button and pressing “Plot Survey” again
Individual scans can be made invisible/visible by selecting the corresponding le name in the list box on the
right
The scan direction and distance can be changed using the appropriate buttons at the bottom of the screen.

18
Depth Chart
A time measurement (in milliseconds) is displayed on the ‘Y’ axis of the display. The APL measures the
time it takes for the acoustic signal to travel from the APL actuator to the underground object and back.
This will assist in identifying objects at similar depth. Consult the APL Time Conversion Chart (below) for
approximate depths.
Caution: Soil type, porosity, moisture content and other characteristics will determine the rate of return
for the acoustic reection. Depth is relative due to many factors and may vary based on these and other
factors. The term “depth” is relative and true depth is not guaranteed when using electronic equipment to
estimate the depth to a target utility line. The only way to ensure accurate depth information is to expose
the utility line and measure the depth.
H/Dry H/Moist H/Wet F/Dry F/Moist F/Wet S/Dry S/Moist S/Wet
Factorm/s 215 200 160 195 155 110 95 75 65
msreading Depthformula(m/s)*ms*1.5(1.5isderivedbydividemsreadinginhalfandmultby3ft/m)
9 2.9 2.7 2.2 2.6 2.1 1.5 1.3 1.0 0.9
10 3.2 3.0 2.4 2.9 2.3 1.7 1.4 1.1 1.0
15 4.8 4.5 3.6 4.4 3.5 2.5 2.1 1.7 1.5
20 6.5 6.0 4.8 5.9 4.7 3.3 2.9 2.3 2.0
25 8.1 7.5 6.0 7.3 5.8 4.1 3.6 2.8 2.4
30 9.7 9.0 7.2 8.8 7.0 5.0 4.3 3.4 2.9
35 11.3 10.5 8.4 10.2 8.1 5.8 5.0 3.9 3.4
40 12.9 12.0 9.6 11.7 9.3 6.6 5.7 4.5 3.9
45 14.5 13.5 10.8 13.2 10.5 7.4 6.4 5.1 4.4
50 16.1 15.0 12.0 14.6 11.6 8.3 7.1 5.6 4.9
55 17.7 16.5 13.2 16.1 12.8 9.1 7.8 6.2 5.4
60 19.4 18.0 14.4 17.6 14.0 9.9 8.6 6.8 5.9
65 21.0 19.5 15.6 19.0 15.1 10.7 9.3 7.3 6.3
Yellowdenotespotentialneedfordeepmode
Usegreenareatoupdateverticalspeedofsound
Usedeepmodesettingforanythinggreaterthan5feet
Usedeepmodesettingforpipesgreaterthan2"indiameter
"H"surfaceisahardsurfacethatleavenomarkwhenyouplaceyourfootonit.
"F"surfaceisafirmsurfacethatleavesasmallmarkwhenplaceyourfootonit.
"S"surfaceisasoftsurfacethatleavesaobviousdepressioninthesoil.
Adrysurfacehaslittleornomoistureinit
Amoistsurfaceisdamptothetouch
Awetsurfaceisoneyoucanseewaterorismuddy.
Whenconsideringasurfacetypeconsidertheconsistencyofthesurfacethrougoutthedepthbeingtested.
SoilCondition
APL Time Conversion Chart
Yellow denotes potential need for deep mode.
Use green area to update vertical speed of sound.
Use deep mode setting for anything greater than 5 feet.
Use deep mode setting for pipes greater than 2” in diameter.
“H” represents a hard surface, that when stepped on, leaves no mark on the ground.
“F” represents a rm surface that leaves a small mark when stepped upon.
“S” represents a soft surface, that when stepped on, leaves an obvious depression on the ground.
A dry surface has little or no moisture in it.
A moist surface is damp to the touch.
A wet surface is one where water has puddled or the ground is muddy.
When considering a surface type, consider the consistency of the surface throughout the depth being tested.

19
Do not mix surface types in a
single scan.
What to avoid
When testing, always perform a scan on surfaces of like material. A scan requires a minimum of 5 slices
on pavement, gravel, grass or dirt.
Do not perform 12” scans on
loose or freshly excavated soil.
Soft soil requires narrow slices.
Do not perform a slice on large
cracks or expansion joints.
How to turn off
- Press the “Disconnect” button on the tablet Display.
- Press and hold the silver on/o󰀨 button until the green light goes out. The unit will beep 5 times.
- Shut down the tablet
o Make sure any data you’ve collected has been properly saved.
o Press on the Windows icon in the lower left.
o Press the (Power) symbol at the upper right and choose “shut down” from the drop down menu.

20
Performing a Locate
Scan Row 1
Scan Row 2
Scan Row 3
Scan Row 4
Scan Row 5
Scan Row 6
Scan Row 7
Scan Row 8
Scan Row 9
Slice
1
Slice
2
Slice
3
Slice
4
Slice
5
Slice
6
Slice
7
Slice
8
Slice
9
Scan Row 1
Scan Row 2
Scan Row 3
Scan Row 4
Scan Row 5
Scan Row 6
Scan Row 7
Scan Row 8
Scan Row 9
Slice
1
Slice
2
Slice
3
Slice
4
Slice
5
Slice
6
Slice
7
Slice
8
Slice
9
= Pipe Found (Marked)
= 1 Slice
Example Grid Plan:
9 Scan Rows
9 Slices Per Row
a. Determine the area to grid.
Plan to perform enough scans in such a manner the area is covered. In areas with multiple systems
to identify, use six inch slices and a maximum of 26 slices per scan (approx. 12 ft (4m)).
b. Set the Measuring Tape
Place the measuring tape on the ground in the area to be tested at a 90-degree angle to the believed
path of the target line. Align the housing of the APL with the beginning point of the measuring tape.
With the instrument powered on and displaying “Ready for Reading”:
c. Place the kickstand in the up position. A magnet on the front of the chassis housing will keep it in
place.
d. Place foot on the foot pad
e. Push forward on the handle creating good coupling to the ground. The actuator is spring loaded so
tension will be noticeable.
f. Press and release the scan button. When the slice is completed a beep will be heard and the
display will show it is ready for the next slice.
Three beeps indicates improper force was applied to the handle or poor ground contact. The unit will
prompt the operator to retake that slice.
HINT: If required to ‘retake” several times, move the instrument 1-2” in any direction and retry.