Fisher Labs Fisher Labs XLT-17 Manual

XLT-17

Liquid Leak Detector

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

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Operating Manual

CONTENTS

Introduction ................................................................................pg. 2

Instrument Set ..........................................................................pg. 3-4

Control Panel ...........................................................................pg. 5-6

Operating Instructions ............................................................... pg. 7

Use of the Multi-Sensor ...............................................................pg. 8

Specifications ........................................................................pg. 9-10

Warranty .......................................................................... Back Cover

INTRODUCTION

Fisher Research Laboratory has always been a leader in the field
of acoustical leak detection. From the early LT-10 through the
XLT-30, high quality sound amplification has been synonymous
with the Fisher name .

Fishers XLT-17 takes leak detection to a new level. The ultra-sensitive
Multi-Sensor, combined with high performance electronics and
crystal clear audio headphones provide a new standard for leak
detection equipment.

2

INSTRUMENT SET

6

5

1

7

4

2

3

3

INSTRUMENT SET

1. Control Box

All listening and filtering controls for the XLT-17 are contained in this sturdy
housing. The function of each control is described in the section entitled
“Control Panel.”

2. Multi-Sensor

Fisher’s MULTI-SENSOR has superior leak detection capabilities. In an
extremely compact design, the MULTI-SENSOR provides better sensitiv­ity to leaks, improvs audio clarity, improvs sensor electronics, and less
interfering background noise. The MULTI-SENSOR is used for both the
ground microphone and direct contact applications – the one sensor
that does it all.

3. Sound Rods

Two different sizes are included with the XLT-17. Rods give the user vari­ous lengths for direct or indirect contact to pipes.

4. Multi-Sensor Handle

This handle is used with the Multi-Sensor

5. Sensor Cable

This cable attaches at the back of the Control Housing to any of the
various sensors, including the Multi-Sensor. Make sure the jack is fully
inserted and the lock nut is hand tightened.

6. Headphones

These headphones are designed to deliver the clearest sound with the
least distortion. The Volume knob can be used to adjust the audio level.
Unplugging the headphones will turn off the XLT-17. (When the XLT-17
is turned off, any modifications to the Volume and Filter will remain at
last settings.)

7. Carrying Strap/Housing Mounting Bracket

The attachment system for the XLT-17 consists of a plastic mounting
bracket that slides from the bottom of the control housing up to the bezel
around the faceplate. There are two slots for attaching an adjustable
strap that hangs around the neck of the user.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

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4

CONTROL PANEL

POWER

This keypad turns the XLT-17 on or off. When the instrument is turned
off, all settings are stored in memory and retained for the next time the
XLT-17 is turned on.

VOLUME ARROW KEYPADS

Press Volume arrow keypad, to modify the volume and sensitivity of the
XLT-17. The arrow keys (up arrow/down arrow) increase or decrease the
audio signal to the headphones. Use the headphone volume knob to
reduce audio as desired.

MUTE

As the name implies, muting disengages the sound to the user. There
is also a control on all listening microphones. This keypad should be
pressed when the sensor is moved to prevent excessive noise to your
ears.

FREQUENCY ARROW KEYPADS

These keypads allow the frequency range of the XLT-17 audio filters to
be modified.

5

CONTROL PANEL

FILTER

The XLT-17 has four different filtering modes.

AL (All Frequencies) – This is the No Filter feature of the XLT-17. No
modifications to the audio can be made with the arrow keys. Frequency
range of the All Frequency setting is from 60 Hz to 6 kHz. This mode is often
used to begin to listen for the leak noise.

(The following filter modes are often used to pinpoint the location of the
leak noise.)

HI (High Range) – This filtering mode allows the user to adjust the
response in the higher areas of the frequency range. Use the arrow keys
to increase or decrease this frequency response range.

LO (Low Range) – Similar to the previous filter mode, the lowpass
filter allows the user to listen to the lower areas of the frequency range.
The arrow keys are used to increase or decrease this frequency response
range.

FC (Frequency Choice) – This filter could also be called Frequency
Select. This mode allows tuning to the frequency that gives the user the
best audio response to the leak noise. The arrow keys are used to move
the cursor, selecting a narrow frequency band of choice.

6

OPERATING INSTRUCTIONS

Set Up

1. Assemble control housing, headset, and Multi-Sensor. The headset
must be plugged in for the XLT-17 to operate.

2. Familiarize yourself with the location of the mute keypad.

Remember to mute the XLT-17 when moving any sensor.

3. Press POWER keypad to turn on the XLT-17. The XLT-17 goes through
a five second warm up before the touch pads are functional. During
this time, the display screen gives information of battery level. A battery
reading under 5 volts will activate the “Low Battery” indicator. The XLT-17
allows some time between the “Low Battery” indicator and complete
system shut down to allow you to complete a job.

4. The XLT-17 always turns on to the last settings used.

5. Press the VOLUME arrow keys to modify headset volume. Use the AR­ROW keypads to increase or decrease the volume. The display screen
will show the volume level in a graph form.

6. Begin your leak detection search.

Modifications During Leak Search

Some leaks are small in size, and unrecognizable, or conditions are such
that very little leak sound can be recognized, so you may need to make
changes to the filter(s) in order to hear leaks. Depending upon the type
of pipe composition and soil (ground) type, different filter settings will
increase your ability to hear the leak sound.
Adjustment to the filter is done by pressing the FILTER keypad which will
allow you to scroll through four different filter types. Frequency range
modifications can be made to the HI, LO, and FC filters. As you are
choosing your filter, the display screen will give a visual display of the
filter type being used, and the frequency range of that filter. After your
selection and modification is made, theunit will automatically return to
the operating mode after a 5 second delay.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

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7

Use of the Multi-Sensor

The multi-sensor was designed for locating leaks in all types of
surface conditions. The new sensor construction will allow leak
detection to be performed on hard surfaces such as concrete,
asphalt, tile, etc, as well as listening to water leaks under turf or
soft surfaces.

On hard surf aces , th e mu ti­sensor sensor is used to pick up
the vibrations generated by a
buried ruptured pipe located
underneath sidewalks or paved
streets . T h e r u b b er housing
diaphragm is designed to reduce
external sounds while the sensor
rests on a hard sur face and
detects the vibrations traveling
underground.

When utilizing the multi-sensor for
direct connection to a pipe, or
listening to buried pipes located
in soft ground or under a turf
surface, you will need to use the
T-Handle and sound rods included
with the unit. Using a threaded
spacer provided on the extension
handle, carefully attach it directly
onto the Multi-Sensor. Assemble
the T- Handle by snapping both
the extension handle and sensor
handle sections together. Sound
rods are then secured to the
threaded coupler on the T- Handle
assy. Sound rod lengths will be
determined by its application.

8

SPECIFICATIONS

Subject to improvement or modification without notice.

Operating Frequency
60 Hz – 6 kHz, Gain = 60 db
20 Hz – 60 Hz, Gain > 55 dB

Filter Types and Frequency Ranges:

All Pass:.......................60 Hz to 6 kHz

Low Pass: ....................

High Pass: ...................

Band Pass: .................

Output Indications:

Audio ..........................High performance headphones (64 ohms)

Visual ..........................LCD bargraph and 2-digit numeric display

Grade of Protection .......Splash Proof

Battery Test .......................Automatic, real time battery level indicator

Battery Quantity/Type ....Two, 9 Volt alkaline

Battery Life .......................50 Hours (approximate)

Carrying Case Dimensions 21”x 6”x 14”

Weight: .............................10 lbs

Adjustable cut-off frequency from 150 Hz to 2.4 kHz
Adjustable pass band frequency from 150 Hz to 2.4 kHz
Adjustable center frequency from 150 Hz to 2.4 kHz

STANDARD EQUIPMENT:
Hard Carrying Case
Operation Manual
Control Unit
Headphones
Muti-Sensor
Carry Strap/Housing Bracket
Sound Rods

Fisher Research Laboratory does not warrant suitability to specific use.
Fisher Research Laboratory shall in no event be liable for any direct, incidental, conse­quential or indirect damages.

9

NOTE: This equipment has been tested and found to comply with the limits
for a Class B digital device pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will
not occur in a particular installation. If this equipment does cause harmfill
interference to radio or television reception, which can be determined
by turning the equipment off and on, the user is encouraged to try and
correct the interference by one or more of the following measures:

- Reorient or relocate the receiving antenna.

- Increase the separation between the equipment and the receiver.

- Connect the equipment into an outlet on a circuit different from that

to which the receiver is connected.

- Consult the dealer or an experienced radio/TV technician for help.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

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