SENSIT Technologies GAS-TRAC LZ-30 User manual

851 Transport Drive
Valparaiso, IN 46383-8432
SENSIT Technologies
is in compliance with
ISO 9001:2008
Phone: 888 4SENSIT
888 473 6748
219 465 2700
Fax: [phone]
www.gasleaksensors.com
GAS•TRAC LZ-30
INSTRUCTION MANUAL

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FOR YOUR SAFETY
NOTICE: This safety symbol is used to indicate a potentially
hazardous situation which, if not avoided, may result in minor or
moderate injury.
WARNING: Read and understand this manual fully before use.
WARNING: Disassembly and maintenance is forbidden in explosive
atmosphere.
WARNING: Any disassembly or repair of the instrument must be done by a
factory certified technician.
WARNING: Follow the manual instructions and testing methods.
WARNING: Continuously low calibration check results or fluctuation of zero
readings may indicate sensor end of life or failure. Consult SENSIT
Technologies with any questions.
CAUTION: Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation exposure.
CAUTION: Do not point the instrument towards the sun, or other extreme
sources of light/heat. Damage may occur.
DANGER: Do not use the device in an explosive environment.
DANGER: Avoid direct eye exposure to the laser and do not point in the
direction of others. Visible and Invisible Lasers are deployed by this
instrument.

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FOR YOUR SAFETY
CAUTION: Laser radiation. Avoid direct eye exposure. Class 3R
laser product.
LASER WARNING LABEL LOCATION
The laser warning label is located on the back of the instrument. Refer to the
label pictured in the lower right for details.
LASER APERTURES

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CONTENTS
Parts And Accessories.................................................................................................5
Standard Accessories (Included)...........................................................................................5
Accessories And Replacement Parts.....................................................................................5
General Description.....................................................................................................6
Specifications...............................................................................................................7
Product Features .........................................................................................................9
Beam Dimensions...............................................................................................................10
Sensor Technology....................................................................................................11
Gas Detection .....................................................................................................................11
Distance Detection..............................................................................................................11
Explanation Of PPM•M ..............................................................................................12
Battery Charging........................................................................................................13
Operation And Use ....................................................................................................14
Operation and Use Tips.............................................................................................16
Investigating Through Windows...........................................................................................16
Shape of the Detection Beam and Line of Sight...................................................................17
Locating Targeting Laser.....................................................................................................19
Wind Conditions and Plume Size.........................................................................................18
Calibration Check (Bump Test)..................................................................................19
Calibration..................................................................................................................21
User Menu.................................................................................................................22
Set Alarm ............................................................................................................................23
Set Red Laser.....................................................................................................................23
Set Green Laser..................................................................................................................24
Reset...................................................................................................................................24
Calibration...........................................................................................................................25
Set Unit...............................................................................................................................25
Maintenance and Care...............................................................................................26
Notes .........................................................................................................................27
Warranty....................................................................................................................28

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PARTS AND ACCESSORIES
STANDARD ACCESSORIES (INCLUDED)
330-00049 D-ring
360-00040 Wrist strap
750-00080 Instruction manual
871-00062 Charging Base
871-00063 Charging base power supply
ACCESSORIES AND REPLACEMENT PARTS
331-00155 Screw for D-ring
871-00064 Charging Kit (charging base + power supply)

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GENERAL DESCRIPTION
The GAS•TRAC LZ-30 is a methane selective laser based gas detector. The
device is based on world-leading photonic technology and is designed using
the effect that methane gas absorbs a certain laser wavelength, and the
absorbing strength is related to the concentration of the methane.
The device is a handheld gas detector, for the remote detection of methane
and gases containing methane (natural gas and naturally occurring sources of
methane). By pointing its beam of laser light to the testing target, a
concentration result can be read immediately within a distance of 0.5 to 30
meters. By sending the beam of the laser to the target destination (such as a
gas pipeline, ceiling, wall, floor, ground, etc.), the device measures the laser
signal returned from the target destination and the methane concentration
along the reflected beam path will be calculated and displayed.
In addition, the GAS•TRAC LZ-30 measures the distance to the target and
displays the result in real-time along with the gas reading.
The laser modules specifications are Class IIIR, with a power output of less
than 5mW for the distance detection laser and spotter laser, and a power
output of less than 50mW for the IR (gas detection) laser.

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SPECIFICATIONS
Detection Technology: Tunable Diode Laser Absorption
Spectroscopy (TDLAS)
Methane Detection Range: 0-50,000ppm-m in 1ppm-m increments
Sensitivity: 5ppm•m ≤15m (50ft)/10ppm•m ≤30m (100ft)
@ ≥ 300ppm•m
Response Time: ≤0.1 seconds
Detection Distance: 0.5m to 30m (1.5’ to 100’)
Distance may vary depending on reflection
Distance Indicator: 0.2m to 30m (6” to 100’)
Range may vary depending on reflection
Beam Dimension: Conical, 20cm diameter at 30m (8” at 100’)
Alarms: Adjustable threshold alarm with baseline:
Visual and audible
Warnings: Low reflection, low battery
Calibration/Self check: No calibration required. Built-in self-test.
Bump test vial available.
Laser classifications: IR laser (methane detection) Class IIIR
Target laser (green) Class lllR
Distance laser (red) Class lllR
Communication: Bluetooth
Display: OLED

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SPECIFICATIONS
Operational Temp: -20C to 50C (-4F to 122F)
Storage Temp: -40C to 60C (-40F to 140F)
Humidity: ≤98% non-condensing
Enclosure: Designed to meet IP54
Intrinsic Safety: Designed to meet US and ATEX
Weight: 300g (0.7lbs)
Size: 164mm (6.5”) x 78mm (3.0”) x 36mm (1.5”)
Power Source: Internal Lithium Ion, 2000mAh
Battery Life: 6 Hours Continuous
Recharge Time: 3 to 4 Hours

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DETECTION LASER (IR, NOT
VISIBLE)
DISTANCE LASER (RED)
TARGETING LASER (GREEN)
BACKLIT OLED DISPLAY
DURABLE,FLAME-RETARDANT
POLYCARBONATE HOUSING
OPERATION BUTTONS
CHARGING PINS FOR INTERNAL
RECHARGEABLE BATTERY
PRODUCT FEATURES
GAS•TRAC LZ-30 instruments are constructed of durable flame-retardant
polycarbonate plastic to withstand the rigors of field use.
The housing contains a rechargeable Lithium Ion battery, which is charged by
inserting the instrument into the charging base.
Open-path TDLAS technology ensures that gas detection is instantaneous,
accurate, and methane specific up to a distance of 30m (100ft).
The operator will be given real-time gas readings on an easy to read OLED
display, displayed in PPM•M by default, along with a distance measurement
for the current target.
The alarm comes in the form of an audible tone as well as a vibrating motor.
There is 1 adjustable alarm threshold, and 3 varying types of alarms at 20%,
50%, and 100% of this threshold.

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PRODUCT FEATURES
BEAM DIMENSIONS
The GAS•TRAC LZ-30 produces a conical beam of laser light, that starts from
the front of the instrument and gradually spreads as the distance increases.
At the maximum detection distance, 30m, this beam is 8” in diameter. This is
depicted in the image below (not to scale).
4” at 15m (50ft)
8” at 30m (100ft)
Point Source

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SENSOR TECHNOLOGY
GAS DETECTION
The GAS•TRAC LZ-30 uses open path TDLAS (tunable diode laser absorption
spectroscopy) technology. The laser generates a specific wavelength of light
that is sent through the gas monitoring area, partially absorbed by any
methane source, and reflected back to the instrument by the reflection surface.
The higher the methane concentration, the larger the absorption will be,
resulting in a higher reading. Using this technology in an open path allows for
the instrument to detect gas remotely, simply by pointing at the target
anywhere from 0.5 to 30 meters away from the operator.
This technology ensures that the gas is analyzed instantaneously and
accurately, as low as 5ppm•m, as well as being specific to only methane.
DISTANCE DETECTION
There is a separate laser that is used specifically for distance detection. It
sends a laser pulse to the target in a narrow beam and measures the time
taken from when it leaves the instrument to when it returns, from the reflection
surface. Using this time measurement, the distance is determined based on
the speed of light.
Both the distance and gas detection rely on a surface that is reflective enough
to return the signal to the instrument. Most solid surfaces will work.

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EXPLANATION OF PPM•M
The GAS•TRAC LZ-30 displays its readings in parts per million meter (PPM•M).
This is a representation of the average gas concentration over 1 meter, or
roughly 3.3 feet.
The detection laser of the GAS•TRAC LZ-30 measures the amount of light
absorbed by a concentration of gas. However, there is no way of knowing the
size of the plume. Because of this, higher concentrations over a small area or
smaller concentrations over a large area can give the same reading on the
screen. While point and shoot technology such as this is a great indication
tool and can be used to pinpoint the source of a leak by comparing readings,
it cannot be used to quantify a gas leak.
See the diagram to the right.
On the top, there is a gas
plume 0.5 meter in length with
a concentration of 2,000 ppm
methane. On the right, there is
a gas plume 1 meter in length
with a concentration of 1,000
ppm methane. The GAS•TRAC
LZ-30 will see the same
amount of absorption in both
scenarios, and therefore give
the same reading of 1,000
ppm•m.
In addition, in a real-world
scenario there will be some
small amount of background
methane in ambient air. This
is generally about 2 ppm•m.
So for a reading at 100m, the
reading on the screen would
be about 200 ppm•m higher.

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BATTERY CHARGING
The GAS•TRAC LZ-30 has an internal, rechargeable lithium-ion battery pack,
and includes a recharging base. This battery is not user replaceable.
To recharge the internal battery, ensure that the charging base is plugged in
and insert the instrument into the base, bottom first. Contacts on the bottom
of the instrument touch spring loaded pins in the bottom of the charging base
to make an electrical connection.
The LED on the front of the charging base indicates the charging status:
Solid Green & Red flicker: No connection
Solid Red: Instrument charging
Solid Green: Instrument fully charged
Charging takes approximately 3 to 4 hours if the battery is fully depleted.
CHARGING
INDICATION LED

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OPERATION AND USE
WARNING: When the GAS•TRAC LZ-30 is powered on, the laser
module will be energized.
1. Push and hold the ON/MENU button until the
screen illuminates. The software version will
be displayed during a brief warmup period
(~15 seconds).
2. If the displays fails to illuminate or a low battery
indication is show, place the instrument in the
charging base to charge the battery.
3. After warmup, the instrument will show the
following on what is called the work display:
a. (Upper left)
Distance measurement
b. (Upper right)
Fuel gauge
c. (Center)
Current methane reading
d. (Lower left)
Peak methane reading
e. (Lower right)
Measurement unit/scale
4. To begin a measurement, press and release the MEASURE button.
During measurement, the targeting laser will flash on and off
continuously, as well as an audible beeping to alert the operator that
a measurement is active. A distance measurement and the current
and peak methane readings will be displayed on the screen.

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OPERATION AND USE
5. Using the indication lasers, survey the area according to federal, state,
municipal, and/or company procedures. Observe the readings on the
display and any alarm conditions that should occur. In general, it is
good practice to conduct surveys using an ‘S’ or ‘Z’ pattern. This both
maximizes the area scanned as well as reduces the chance for false-
negatives.
6. If at any time the instrument gives a low or high reflection warning,
indicated by REF/Lor REF/Hon the display and an audible tone, try a
different angle, position, or distance in order to increase or decrease
the amount of reflected light. These messages indicate that the
instrument is not getting an appropriate amount of reflected light. Be
aware that not all surfaces may be suitable for reflection.
7. If at any time the instrument displays HIGH METHANE, this is an overload
warning indicating that you are detecting gas greater than the upper
detection limit of the instrument (50,000 ppm•m).
8. To stop a measurement, press and release the MEASURE button again.
9. To access the user menu, press and release the ON/MENU button. The
user menu cannot be accessed if a measurement is currently active.
See the user menu section in this manual for more details.
10. To power off the instrument, press and hold the OFF/BACK button. A
brief animation will show. Keep the button held down until the screen
goes blank.

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OPERATION AND USE TIPS
Factors such as line of sight, wind, and sunlight conditions are not something
that most operators have had to take into account in the past. This section
gives a few tips and tricks for getting the most out of the GAS•TRAC LZ-30.
NOTE:Federal, state, municipal, and/or company procedures supersede
what is outlined in this section.
INVESTIGATING THROUGH WINDOWS
The laser technology used in the GAS•TRAC LZ-30 allows the instrument to
detect through standard window glass. This is a big advantage as it allows
the user to investigate the inside of a building (for example) when he/she
otherwise might not have been able to gain access.
In order to get the best results in this type of a scenario, there are two
important steps that should be followed:
1. Maintain an angle of attack that is less than 90˚
to your target, and ideally greater than about
70˚. This is depicted in the image to the right.
This greatly reduces the chance of what is
known as “specular reflections”, which is when
a portion of the laser reflects off of the surface
of the window. It is also especially helpful for
double-pane windows where the laser might
reflect/bounce multiple times between the
panes.
2. Maintain a distance between the instrument
and the window of 5m (~15ft) or greater.
4m
90˚
75˚

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OPERATION AND USE TIPS
SHAPE OF THE DETECTION BEAM AND LINE OF SIGHT
Since the GAS•TRAC LZ-30 uses a point of light for targeting, it can be easy to
forget that the actual detection path is in the shape of a cone, which starts from
a point (the instrument) and gets wider on the path to the target. At a distance
of 30m (100 ft.), this width is 20cm (8 in.).The operator will get the most
consistent results if he/she keeps as much of this path in/over the target as
possible.
Some scenarios can be problematic as a result of this, such as if part of the
beam is reflecting off of a different surface than another. This is known as
“beam skipping”. The operator will get the most consistent results if he/she
keeps as much of this beam in/over the target as possible.
In the picture to the right (beam not
to scale), part of the beam is partially
blocked by the fence, potentially
causing reduced sensitivity, or in
some cases, false positives. The
operator should simply move slightly
to the left, ensuring that the full width
of the beam will make it to the target.
If the operator were surveying the
ground behind the fence, this
wouldn’t be too great of a mismatch,
but if the target was the face of the
building in the background, there
would be a very large difference in
return signal between the portion of
the beam that is hitting the building
and the portion that is hitting the
fence.

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Wind
OPERATION AND USE TIPS
WIND CONDITIONS AND PLUME SIZE
Since the path of the laser has to pass through the methane plume for
detection, wind conditions can greatly affect how the instrument operates,
unless you are targeting the actual source. Because of this, especially when
scanning a large area, it makes sense to have a plan of attack.
In a scenario where the laser might pass through the plume from downwind,
upwind, or crosswind, either of the first two will generally result in much higher
readings because the path distance through the gas is much greater than from
crosswind. However, higher readings does not always mean there is also a
higher chance for detection. Many times a crosswind scenario would yield a
much higher chance that the gas will be detected, because a much larger
portion of the user’s field of view, or scan-able area, will contain gas.
Additionally, sometimes the instrument will be more likely to detect a gas
source in a location that is not directly at the source. Methane naturally rises,
and the plume will naturally enlarge over time. The picture below shows that
if the instrument is pointed closer to the gas source, there will be a much
smaller area / distance that the laser beam is passing through, making it more
likely for the user to miss it. Maximizing this area will increase the chance of
detection. Even though the reading on the display would be higher at the
source, a large plume greatly increase the likelihood that the laser will actually
pass through it. After detection, the operator can further narrow down the
survey area to pinpoint the source.
In this case, the wind is helping the operator as it is taking the gas plume
towards a large reflection surface. If instead the wind direction was parallel to
the pipe, the operator may not be able to use the same tactic of sweeping
against the wall as reliably.

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OPERATION AND USE TIPS
LOCATING TARGETING LASER
With bright sunlight, the targeting laser may be difficult for some to see. This
is unfortunately a downside of any technology of this nature. There are a few
things that can help with this.
One thing that might help in this scenario is to begin tracking the laser from a
location where you can see it clearly. For example, point the instrument at the
ground in front of your feet, and gradually sweep it forward, away from you, to
your target. Your eyes will have a much easier time following a moving target
than finding a missing one.
Additionally, the operator can use laser enhancement glasses. This can
increase the contrast of the targeting laser, making it easier to see against
certain backgrounds. Below is a view with and without these glasses.

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CALIBRATION CHECK (BUMP TEST)
To verify the accuracy of any GAS•TRAC LZ-30, a bump test must be
performed. This is done using the calibration cell, which is built into the hard
carrying case.
A sensor that does not meet the specifications listed in this manual may
require calibration or repair. Any time it is suspected that the GAS•TRAC LZ-
30 is not working properly, check calibration. Power on the instrument and
allow the warmup process to complete before proceeding.
STEP 1: Place the instrument in the carry case. Ensure both the
instrument and calibration cell are fully seated. Ensure
there are no obstructions in the path between the
instrument and cell.
STEP 2: Press and release the MEASURE button to begin a
measurement. Allow the unit to read for a few seconds.
STEP 3: Press and release the MEASURE button again to stop the
measurement. The MAX reading on the screen, in the
lower left, should be 1,500 ppm•m or greater for a
successful test.
NOTE: If the result is less than 1,500 ppm•m, attempt the
bump test again. If still unsuccessful, perform a
calibration.