Spectronics Corporation Marksman II SPI-MDT User manual

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OPERATOR’S MANUAL
What You Can't Hear Is What
You Need To Hear!
1/20 AM19050ML-2
PRINTED IN U.S.A.
ENG - 1 FR - 23 DE - 67ES - 45
SPI-MDT

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EU DECLARATION OF CONFORMITY
This declaration is issued under the sole responsibility of the manufacturer
Spectronics Corporation. The object of the declaration is to certify that this
equipment, designed and manufactured by Spectronics Corporation, is in
conformity with the relevant Community harmonization legislation. It has been
constructed in accordance with good engineering practice in safety matters
in force in the Community and does not endanger the safety of persons,
domestic animals or property when properly installed and maintained and
used in applications for which it was made.
Equipment Description: Ultrasonic Leak Detector (with integrated laser
pointer)
Model Number: SPI-MDT
Applicable Directives:
• 2014/30/EU General EMC
• 2011/65/EU RoHS
Applicable Standards:
Safety:
• EN 61010-1:2010 Safety requirements for electrical equipment for
measurement, control, and laboratory use. General requirements.
• IEC 60825-1:2014 Safety of Laser Products - Part 1: Equipment
Classification and requirements.
Emissions: CISPR 11/EN 55011:2009 (+A1:2010) Emission standard for
industrial, scientific, and medical (ISM) radio RF equipment (Class B).
Immunity: EN 61326-1:2013 Edition 2.0 (EMC - Measurement, Control
& Laboratory Equipment) Immunity per Table A.1 - Portable Test and
Measurement Equipment.
RoHS: EN 50581:2013 Technical documentation for the assessment of
electrical and electronic products with respect to the restriction of hazardous
substances.
CE Implementation Date: April 26, 2016
ANY QUESTIONS RELATIVE TO THIS DECLARATION OR TO THE
SAFETY OF PRODUCTS SHOULD BE DIRECTED, IN WRITING, TO THE
AUTHORIZED REPRESENTATIVE AT THE ADDRESS BELOW.

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VIDEO GUIDE
To view a video guide highlighting the effective use of the
Marksman II, follow the link or scan the QR code:
https://vimeo.com/89312701
CONTENTS
Declaration of Conformity............................................................2
Contents ......................................................................................3
Features.......................................................................................4
Introduction/General Information ............................................. 5-6
Kit Configuration and Components.......................................... 6-7
Batteries (Changing/Replacing/Disposal)....................................7
Important Tips...........................................................................7-8
Integrated Laser........................................................................8-9
Safety Precautions.....................................................................10
Operating Instructions ..........................................................10-11
Heterodyne Feature...................................................................12
Ultrasonic Emitter ......................................................................13
High Noise Environments ..........................................................14
Typical Scanning Methods/Tips............................................14-16
Applications ..........................................................................17-20
Care and Maintenance .............................................................20
Warranty and Liability................................................................21
Technical Specifications .......................................................21-22
Replacement Parts ....................................................................22
Marksman™ II is a trademark of Spectronics Corporation.
DURACELL®is a registered trademark of Duracell Inc.

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FEATURES
The Marksman II Ultrasonic Diagnostic Tool converts and amplifies
inaudible ultrasonic sound into audible “natural” sound by
employing technologically advanced circuitry. It operates on the
principle of detecting high frequency ultrasonic waves, which are
created by friction from all moving parts, whether solid, liquid or
gaseous. These “sounds” reside far above the range of the human
ear and tend to be highly directional.
This directional aspect of ultrasonic waves allows one to isolate a
suspect signature sound from other background noises and detect its
exact location. This sound analysis can be used for efficiently
investigating the following areas of repair and preventive maintenance
in the following transportation and industrial applications:
1. Air leaks
Both vacuum and compressed air leaks create an energy packet or
wave front which can result in an ultrasonic emission with a
differential of 5 psi from a 12 inch (30.5 cm) distance, and/or a hole
down to 0.004 inches (0.1 mm) in diameter.
2. A/C refrigerant leaks (for most types of refrigerant)
3. Gas and liquid turbulence
Turbulence associated with steam trap and internal valve leaks,
cavitation, and blockages in liquid and air/gas lines.
4. Electrical discharge
Electrical discharge associated with insulation breakdown,
tracking, corona and arcing.
5. Diagnosing solenoid operations
6. Mechanical wear
State of mechanical wear in bearing and race assemblies, shafts
and gears (also indicating the state of lubrication).
INTRODUCTION
Faults, malfunctions and/or flaws in mechanical, electrical and
pneumatic devices, as well as in container-type objects, start as
small defects or leaks. The physical size of these defects is so

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relatively small that the sounds they produce are above the range
of human hearing. Most commonly, these faults generate sounds
in the 38,000 to 43,000 cycles per second range, generally referred
to as being in the ultrasonic range.
To employ the ultrasound methodology in a usable manner, it is
imperative that the listener have access to an audible sound that
bears a resemblance to the natural sound of the defect.
A mechanical bearing with a defective ball should sound like such.
Likewise, converting the ultrasound frequencies to audible
frequencies is not sufficient with regard to rendering a usable
signal. For this reason, the Marksman II incorporates a
process whereby the audible signal bears a close likeness to
the natural incoming sample. We call this process “Sound
Signature Technology,” whereby a gas leak sounds like a gas leak
and a defective bearing sounds like one.
GENERAL INFORMATION
The Marksman II is sensitive only to ultrasound (40.5 kHz) and is
unaffected by audible noise. Internal Noise Control (I.N.C.) allows
the use of this instrument in extremely noisy environments such as
mechanical rooms, around operational chillers, etc. Drag your
finger upwards on the sensitivity touch pad to increase sensitivity
when experiencing little or no environmental noise. Drag your
finger downwards on the sensitivity touch pad to reduce sensitivity
in response to an increase in environmental noise. The I.N.C.
works much like a two-way radio squelch allowing only the
strongest and closest signals to penetrate the electronic wall built
by the I.N.C. circuitry.
Many variables can affect the amount of ultrasound generated by
the leakage of gas through an orifice. Such factors include the
pressure/vacuum versus the surrounding environment, how
smooth the edges of the orifice are, the diameter of the orifice, the
leak detector’s distance from the orifice and the presence of air-
flow, which may dissipate the ultrasound. As you use the
Marksman II, keep in mind that these factors may affect your ability
to detect ultrasonic leaks.

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Ultrasonic Emitter
The emitter gives off a warble output centered at 40kHz. This
output cannot be heard by the human ear. If the red indicator is on,
the unit is emitting.
KIT CONFIGURATIONS AND COMPONENTS
SPI-MDT—Master Kit with noise-canceling headphones
Master Kit Contains
1. The Marksman II ultrasonic receiver. This easy-to-use unit
incorporates audio feedback and five LEDs to indicate the
intensity of the signal. The receiver has a permanently fixed
2-inch directional receiver port, 3.5 mm stereo jack port,
sensitivity adjustment pad and power button.
2. One black rubber 73/8inch (18.7 cm) air probe, and a
precision-length contact probe.
3. Choice of either a standard full-sized headphone set with a
3.5 mm stereo jack, or noise-canceling headphone set.
4. A rugged carrying case for storage and transportation.
5. The ultrasonic emitter. Sends out a 40kHz pulse for use in
testing seal integrity in non-pressurized vessels.
6. Two D-cell alkaline batteries.
7. The Marksman II features an integrated laser pointer. This
feature is designed to aid in pinpointing leak sites.

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Air and Contact Probes
The air and contact probes are precision parts, designed to
optimize the response of the Marksman II receiver. The 12 inch air
probe extends its reach and can isolate one leak among multiple
suspect areas. Do not modify the probes in any way and never use
the probes for applications other than described in this manual.
BATTERIES (CHANGING/REPLACING/DISPOSAL)
Two D-cell alkaline batteries are required (included). When the
batteries near the end of their useful life, the battery LED will flash.
To change the batteries, depress the release tab using a coin or a
screwdriver and slide back the cover. Replace the batteries with
two new D-cell alkaline batteries. Replace the cover by holding it in
place along the side rails while sliding it forward to engage both the
rear hooks and the front release tab.
Be sure to dispose of batteries in a manner dictated by your
local laws.
IMPORTANT TIPS
Receiver and Emitter Port Openings
The port openings of the receiver and emitter contain a precision
transducer, the heart of the Marksman II ’s operation. During use,
guard against any foreign matter entering this area.
Calibration
The Marksman II has been optimally tuned at our factory and
should require no recalibration during its life under normal
conditions.
LED Display
The LED display allows you to zero in on a steady-state source of
ultrasonic sound, such as when locating an air or vacuum leak or
when using the emitter. Simply watch for a rise or drop in the LEDs
to pinpoint the source of the problem.

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www.HearMarksman.com
WARNING: Do not aim the laser pointer at any person or animal.
The Marksman II includes a built-in laser pointer. It is important to
adhere to the following warnings and safety instructions to prevent
injury:
Never shine a laser pointer into a person’s eyes or stare into the
laser beam. This can cause instant temporary vision dysfunction
such as flash-blindness, disorientation, or glare. This can be
particularly dangerous if the exposed person is engaged in a
vision-critical activity such as driving. In addition, prolonged and/
or repeated exposure to the laser beam can be hazardous and
damaging to the eyes.
Never aim a laser pointer anywhere at or near any person or
animal. Laser pointers are designed to point at inanimate objects
only. In some states and provinces, it is illegal to aim a laser pointer
at a law enforcement officer or any other person. The purchaser/
user is responsible for ensuring that his or her use of the laser
pointer conforms to any local laws.
Do not point a laser at mirror-like surfaces. A reflected beam can
act like a direct beam to the eye.
Laser pointers are not toys. Do not allow a minor to use a laser
pointer unsupervised. In some states and provinces, it is illegal for a
minor to purchase and/or use a laser pointer.The purchaser/user is
responsible for ensuring that his or her purchase or use of the laser
pointer conforms to any local laws or jurisdictions.
Laser Pointer Feature
The Marksman II features an integrated laser pointer. This feature
is designed to aid in pinpointing leak sites. Briefly press the power
button to turn the laser pointer ON. To turn the laser pointer OFF,
briefly press the power button again.

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Headphone Jack
Power Button
Battery Cover
Battery Indicator
Laser Aperture
Laser Aperture Specifications
Battery Life (with laser off): Approximately 165 hours
Battery Life (with laser on): Approximately 115 hours
Class 2 Laser Pointer
WARNING: Do not aim the laser pointer at any person or animal.

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Miscellaneous
To prolong battery life, turn off the Marksman II when not in use,
avoid rough handling, and keep it away from the elements. Use the
carrying case for protection and for transporting.
SAFETY PRECAUTIONS
While the MarksmanII allows you to focus on
diagnosing a problem in a fast and effective manner,
never lose focus of your surroundings.
1. Always remember that the Marksman II and its probes are an
extension of your hand. Keep the probes and your hands a
safe distance from moving parts and electrical areas.
2. Never overreach or destabilize your footing while using the
Marksman II.
3. Stand a proper distance away from electrical and moving
parts.
4. Always be aware of the headphone cord when near moving
parts.
5. Wearing headphones hinders your ability to listen to your
surroundings. Always be alert!
6. Never use the contact probe to diagnose electrical problems.
OPERATING INSTRUCTIONS
1. If you want to enable heterodyne mode (see page 10), plug
the headphone jack into the receptacle located on the face
of the panel.
2. If you need to isolate an ultrasonic source more precisely,
attach the air probe into the receiver port. Or, the unit can be
used without the air probe attached first.

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3. Press the power button to turn the unit on. The Marksman II
features an integrated laser pointer. This feature is
designed to aid in pinpointing leak sites. Briefly press the
power button to turn the laser pointer ON. To turn the
laser pointer OFF, briefly press the power button again.
Once the unit is turned on, it will operate at maximum sensitivity.
The instrument will not beep or tick in an idle state but the battery
LED will illuminate to indicate that the detector has adequate
power. When the battery LED flashes, this indicates that the
batteries are nearing the end of their useful life and will soon need
to be replaced.
Note: Increasing the volume does not increase the
unit’s detection sensitivity. Setting the volume control too high
can lead to operator fatigue.
4. Point the Marksman II in the direction of the suspected leak or
defect and scan the area by making a slow “X” (a vertical and
horizontal type sweeping motion) while keeping the probe
pointed in the general direction of the suspected leak or
defect.
5. The Marksman II will beep when it detects an ultrasonic
disturbance. (When the headphones are plugged in, the unit
will not beep. See Heterodyne Feature on page 10.) To isolate
the ultrasonic disturbance, gradually decrease sensitivity by
slowly dragging your finger down the touch pad until the
beeping stops. The sensitivity level will be indicated briefly by
the number of illuminated LEDs next to the touch pad.
6. Move closer to the suspected leak or defect, continuing the
sweeping pattern and narrowing the range of the sweep by
smaller patterns until the ticking once again increases. This
will lead to the location of the ultrasonic disturbance. If an
exact location is desired, attach the flexible rubber extension
to the probe and repeat step 5.
7. Repair all leaks or defects as located and repeat the scan.

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HETERODYNE FEATURE
The Marksman II features heterodyne capability, which converts
the ultrasonic frequencies detected by the instrument to sounds
that can be heard by the human ear. This allows you to more
easily isolate the ultrasonic source.
Simply plug the included headphones into the jack on the right
side of the Marksman II to enable heterodyne capability. Dragging
your finger upwards/downwards on the sensitivity touch pad will
increase/decrease the volume of the headphones.
NOISE-CANCELLING HEADPHONES
Please follow the instructions below when using the
RP-NCH-01 Noise-Cancelling Headphones.
1. Switch on the ultrasonic receiver and plug the headphone con-
nector into the receptacle located on the right side of the
receiver.
2. Plug the opposite connector into the jack located on the bottom
of the left headphone.
3. Turn the headphones on using the switch on the side of the right
headphone. Make sure the red indicator light is lit when the
power switch is in the on position. If the light does not turn on,
the headphones may need to have the batteries replaced. (One
AAA battery is included and pre-installed. The battery chamber
is accessible via the top of the right headphone.)
4. Put on the headphones, adjusting the headpiece as needed so
that the headphones surround each ear with the outer rims
snugly against your head for optimal noise cancellation.
5. Adjust the volume on the receiver according to the noise level in
your environment (using the receiver touchpad), then slowly
increase or decrease the volume on your headphones with the
volume control knob on the headphone cord.

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ULTRASONIC EMITTER
The Ultrasonic emitter is used with the Marksman II to locate
leaks in walk-in coolers/freezers, wall and ceiling joints, around
doors, windows, body seals, rubber moldings, ducts, etc. The
emitter produces the precise frequency detected by the Marks-
man II. By placing the emitter in a sealed area and scanning the
exterior of this area, any signal escaping from the sealed area will
be indicated by the Marksman II. A flaw in the seal can quickly and
accurately be pinpointed.
1. Turn on the emitter’s power switch. The LED will illuminate to
indicate it is operating.
2. Splace the emitter into the area to be tested completely.
3. Set the “Sensitivity” control of the Marksman II to maximum.
4. Scan the exterior area for the suspect leaks.
5. To pinpoint leaks, see General Information on pages 5-6.
6. When using the emitter with headphones plugged into the
Marksman II, the instruments will indicate ultrasonic
disturbances through a variable-pitch tone.
6. For quieter settings, first increase the volume on the receiver and
then adjust the headphones to slowly increase the volume
upwards from a low setting.
7. Faint static is normal due to background noise. Use the volume
control knob to adjust the level to your needs and the
specific application.

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HIGH NOISE ENVIRONMENTS
In noisy environments, it may be necessary to “tune out” unwanted
signals from other areas close to where you are scanning for leaks
or defects. Begin by attaching the air probe extension over the nose
piece. When the extension is attached, the sensing angle of the
instrument is reduced, increasing the directional capability and
reducing the effects of the adjacent noise sources. This allows the
probe to become more directional.
If you suspect that your reading originates from a source other than
what you are scanning, point the probe toward the other suspected
source (it may be a compressor V-belt, discharging steam line, etc.)
and slowly decrease the sensitivity until the alarm stops. Turn the
probe back toward direction of the suspected leak or defect and
continue to scan. This step may have to be repeated as you move
around to other locations in search of leaks or defects.
If the probe is close to the internal moving parts of the equipment
and the alarm sounds, push the rubber probe against the housing
of the equipment. If the alarm still sounds, internal friction of mov-
ing parts, not a leak source, may be causing the alarm.
TYPICAL SCANNING METHODS/TIPS
The Marksman II provides information in two ways: qualitative,
through the ability to “hear” the signature ultrasounds produced by
various types of equipment, and the ability to see the feedback
level on multiple LEDs.
The air and contact probes are used to optimize the response
depending on the type of inspection being performed. The air
probe is best used for detecting ultrasounds associated with a
pressure leak or an electrical corona, while the contact probe is
best used to detect the ultrasounds generated from within a casing
such as in a gear, bearing, pump, valve or steam trap housing.

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Mechanical Malfunctions
The photo to the right shows a typical way to
inspect a potential wheel bearing problem. In
this case, the air probe is used since the
wheel is being turned while listening for the
sound of the bearings. The tip of the probe is
kept 2-3 inches from the inspection area.
Response can sometimes be optimized by
removing the wheel and using the contact
probe to touch the stationary center hub. This
applies to motor housings as well when checking motor bearings.
The contact probe is also used in the same manner for investigating
fuel injectors and coil-over-shock suspension systems. Touch the tip
of the metal probe to the surface area being tested. Correct
operation sounds one way, while malfunction sounds
another way. You will easily hear the difference.
Electrical Corona Discharge
At right is a typical application using the
Marksman II to detect possible electrical mal-
functions by listening to the electrical corona
discharge associated with power switches and
breaker boxes. As with all potentially
dangerous situations, use caution.Use the
hollow air probe or use the receiver alone
when inspecting electrical conditions and
always keep a safe distance between the air probe tip and the
metal panel surfaces.The Marksman II is highly sensitive to pick-
ing up voltage breakdowns. The resultant ultrasonic sound has been
described as sounding like “frying bacon.”
Pressurized and Vacuum Leaks
Applications for pressurized type inspections are endless,
including compressed air or gas of any kind, air brake systems,
pipes/pipelines, steam systems, water lines, manifolds, and
likewise all vacuum systems. Note: Ultrasonic detection relies on
detecting the sounds associated with the turbulence of the fluid or

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Emitter
Receiver
gas exiting a hole or orifice under a differential pressure. It is
independent of the type of gas or fluid in the system. The
Marksman II will readily detect air and vacuum leaks typically
caused by bad gaskets, worn valve seats and cracks in pipes,
hoses or fittings.
Non-Pressurized Leaks
Non-pressurized vessels or containers cannot generate ultrasonic
sounds. The ultrasonic emitter (if equipped) is used to broadcast
an ultrasonic noise, which is optimized to the frequency response
of the Marksman II receiver. Some examples are leaks in heating
and cooling system ducts and pipes, tanks, windshields, weather-
stripping and whole house integrity.
1. Turn on the emitter and place it in the enclosed environment to
be evaluated. The emitter
will fill the interior with a
piercing warble sound.
Note: Since the output is in
the ultrasonic range, you
will not hear it without the
receiver.
2. Walk around the exterior of
the enclosed environment
while sweeping the
receiver around the
suspect areas. Compromised areas will be revealed by a
change in tone and intensity, both audibly and visually, by
listening and watching the changes on the LED display.
Using the LED Display to Locate Leaks
Please note that the volume control is independent of the LED
display during an inspection. Depending on the amount of
ultrasonic signature being detected, you can use both the level of
intensity on the LED display and the audible amount of sound
through the headphones. As you get closer to the leak or defect,
decrease the volume. As the sound gets louder, repeat the
process until you have pinpointed the location.

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APPLICATIONS
VACUUM LEAKS: Place the hollow air probe on the unit and listen
and watch the LEDs. You can pinpoint the location of vacuum
leaks quickly and easily. Use the hollow air probe or use the
receiver alone.
FIND THAT ENGINE NOISE. The Marksman II will locate those
engine noises and let you find where they are truly coming from.
Ultrasound does not transfer within engine components due to the
directional characteristics of ultrasound. Use the solid contact
probe.
ELECTRICAL SYSTEMS: Separations in high-tension spark plug
wire conductors can be quickly identified from the corona
discharge “snapping” sound emitted. The same applies to arcing
within electrical motors and accessories. Also, listen to connection
points for the “snapping” or “frying bacon” sound; this is a sound a
poor connection makes under electrical load. Circuits are best
tested under operation and full load.
The MarksmanII is also great at locating short circuits. Shorts give
off a “frying” or “snapping” sound also. As you are checking for
shorts or connection problems, do not forget to wiggle the
wiring! Those electrical problems will now call out to you. Save
time! Use the hollow air probe or use the receiver alone.
IGNITION SYSTEMS: Listen to today’s ignition systems. You can
hear the coils and plugs firing. This is by far the best and quickest
method for diagnosing Coil Over Plug (COP) systems. It also works
great on Distributorless Ignition Systems (DIS). You will hear the
snapping of the plugs firing in the headset. After some experience
testing ignition systems, you will be able to tell if you have a plug or
wire problem by the sound alone. When checking DIS systems,
make sure you listen at both ends of the wire if you can. Use the
solid contact probe or use the receiver alone.

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EVAP SYSTEMS: Checking for leaks in evaporative emission sys-
tems is simple. Start by pressurizing the EVAP system (do not
exceed the recommended pressure). Now, sweep all the hoses and
components of the system and listen for a hissing noise that would
indicate a leak. Once the general area of the leak has been
determined, move closer with the receiver to pinpoint the exact
leakage source. Use the hollow air probe or use the receiver
alone.
INJECTORS: Place the solid contact probe onto the injector to test
and listen while the engine is running. You can hear the injector
working plus hear the fuel flow. You may also want to shut off the
engine and listen to make sure that the injector is not leaking fuel
past the injector nozzles. If fuel is flowing, it will create a rushing
noise in the headset. A good clean injector will make a sharp
ringing clicking tone, while a dirty injector will have a muffled
clicking tone. Use the solid contact probe.
AIR BRAKE SYSTEMS: The Marksman II can help locate leaks
quickly in both vacuum assisted and air brake systems. In many
cases, leaks can be detected from a considerable distance. After
building up full pressure (in the case of air brakes), a casual sweep
of the vehicle from one end to the other using the receiver can often
locate the leak. Use of the headphones will reduce noise
interference from the shop. If the first sweep does not locate the
leak, trace out the entire air system piping at close range (1-2 feet
or 0.3-0.6 m) with the receiver. Once the general area of the leak
has been determined, the receiver probe is very useful to pinpoint
its exact location. For maximum effectiveness, be sure that
pressure is maintained in the brake system during the entire
search. If no leaks are discovered, check the air horn, windshield
wiper and other air-actuated equipment. Leaks in these accessories
can produce an abnormal gauge drop. Use the hollow air probe or
use the receiver alone.

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Receiver
Emitter
TIRES: Sweep the tire, including the rim and valve system, to
search for leaks. A sweep with the ultrasonic receiver will locate
even the smallest of leaks. The receiver normally finds leaks of
sufficient magnitude before they cause downtime on the highway.
In addition, you can put a soap solution on tires and listen for the
bubbles to pop. Use the hollow air probe or use the receiver
alone.
LEAKING ENGINE VALVES: All valves should emit a sound in a
very close meter and sound pattern when the probe is placed on
the intake manifold opposite the intake port. A suspect valve can
then be positively checked, with the engine off, by bringing that
particular cylinder to full compression and placing the probe on the
valve stem. The “hiss” of escaping gas across the valve seat will be
distinctly audible on the leaking valve. You can use the same
procedure to check exhaust valves, but the signal intensity will be
much greater. Use the solid contact probe.
EXHAUST SYSTEMS: With the engine idling, pulsation in the
exhaust system can be detected with the receiver. Leak points
normally give off a much louder and sharper sound. Use the
hollow air probe or use the receiver alone.
DOOR AND WINDOW
GASKETS, BODY
WEATHER-STRIPPING,
DOOR AND TRUNK
SEALS AND FUEL
TANKS: When placed
inside a vehicle, a
completely empty fuel
tank or any other
enclosure, the activated emitter can easily locate leaks in
weather-stripping, seals or the structure itself. Use the hollow air
probe or use the receiver alone.

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Emitter
Receiver
ADDITIONAL APPLICATIONS
HYDRAULIC SYSTEMS: Partially blocked or bypassed valves in
high-pressure hydraulic systems can be difficult and costly to find
with conventional methods. Since hydraulic systems employ very
high pressures, the intensity of the ultrasonic sound given off by an
internal leak is extremely high and easily detected by the receiver.
Use the hollow air probe, solid contact probe or use the
receiver alone.
WATER LEAKS IN ROOFS, WINDOWS OR DOORS: Place the
activated emitter (if equipped) below the suspected leak area.
Check the suspected part of the roof, window or door with the
receiver to isolate where the leak originates.This will also aid in the
detection of any leaks in the area. Use the hollow air probe or
use the receiver alone. (See figures below.)
CARE AND MAINTENANCE
To clean exterior surfaces, wipe with a soft damp cloth.
When the battery LED flashes, the batteries are near the end of
their useful life and will soon have to be replaced. See Batteries
(Changing/Replacing/Disposal) on page 7.