REED GD-3300 User manual

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Instruction
Manual
Combustible Gas Leak
Detector
Model GD-3300
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INTRODUCTION
The Combustible Gas Leak Detector has a 16” gooseneck probe to nd
leaks in hard-to-reach areas. It’s adjustable alarm, one-hand operation
with thumb-controlled sensitivity adjustment, and impact-resistant storage
case add up to value and convenience.
FEATURES
Easily operate the Combustible Gas Leak Detector with one hand to
detect the presence of combustible gases. Audible and visual indicators
help to pinpoint leak sources. Adjustable ssensitivity (“tick rate”) helps to
eliminate background gas concentrations in contaminated environments.
• 50 ppm sensitivity
• Adjustable tick rate to locate leaks quickly and easily
• Visual leak detection by LED indicators
• Precision sensor detects even the smallest leaks
• Fast response of less than two seconds to 40% LEL
• Includes earphone jack
• 16” gooseneck
SAFETY TIPS
Before using this instrument, read all safety information carefully. In this
manual the word "WARNING" is used to indicate conditions or actions
that may pose physical hazards to the user. The word "CAUTION" is used
to indicate conditions or actions that may damage this instrument.
If you are using your Combustible Gas Leak Detector as a result of a
service call, chances are someone has either smelled a combustible gas
leak or someone has reason to believe gas may be leaking. While your
Combustible Gas Leak Detector is designed to function without producing
sparks or otherwise igniting the gases it detects, the environment you are
responding to probably has no such safeguards. Most combustible gas
leaks are noticed long before concentration levels build up to the point
that explosion hazards exist.
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WARNING!
If you feel an explosion hazard exists:
• Arrange for evacuation of people in the area
• Call proper authorities from a safe location
• Shut off gas source, if possible
• Ventilate enclosed areas if possible to do so without risk of ignition
• DO NOT switch on power in area in question
As a matter of routine, ventilate the area you plan to work in. Ventilation
will help ensure the gas does not accumulate in large volume where it
can attain its Lower Explosive Limit (LEL).
Lower Explosive Limit (LEL): The point at which a combustible gas,
when mixed with air, has developed the minimum concentration to com-
bust when exposed to a source of ignition. The LEL is usually stated as a
percentage of gas in air, as a fuel-air-ratio, or as parts-per-million (PPM).
International Symbols
Conforms to European Union directives
CONTROLS AND INDICATORS
1. Sensor Tip Guard & Sensor (internal)
2. Gooseneck Probe
3. Alarm Light
4. Ready Light (Power-On)
5. Power ON/OFF Slide Switch
6. Earphone Jack
7. Tick Rate (Sensitivity) Adjustment
8. Probe Clip
9. Handle
10. Battery Cover
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INSTRUCTIONS
Switch on the Combustible Gas Leak Detector by sliding the ON/OFF but-
ton and the READY light is glowing. The gas leak detector runs through a
one-minute warm-up and self-zeroing sequence when it is rst turned on
in fresh air. The alarm of the instrument may be very loud without contact
with any gas, that is caused the initial preset sensitivity.
Rate (Sensitivity) Adjustment
Each time the instrument is put into service, you should conduct a quick
functional test. Adjust the tick rate to non-alarm level. Then, simply ex-
pose the sensor to a known leak, like a cigarette lighter, or pass the probe
over a drop of combustible uid. After the initial warm-up, the instrument
can be used to detect combustible gases. When the sensor in the probe
tip detects a combustible gas, the tick rate will increase and the instru-
ment sounds a warbling tone while the ALARM light. As the concentration
of gas increases, so does the tick rate.
If the situation calls for quiet operation, or if background noise makes it
difcult to hear the built-in speaker, you can use an earphone. The jack
is at the top of the instrument. Note that listening to the alarm or tick
through the earphone is very loud.
If the READY light is off, the batteries are low. They should be replaced
immediately. Low batteries will adversely affect the instrument’s reliability.
See battery replacement procedures.
Adjusting the Tick Rate (Sensitivity)
The tick rate tells you when the sensor (in the tip of the instrument) is
getting close to a gas leak. You can control the tick rate using the rotary
wheel in the center of the instrument.
• Move the wheel clockwise to increase the frequency
• Move the wheel counter-clockwise to decrease the frequency
A tick rate of 4 to 8 ticks per second, in fresh air, is typical. As the sensor
comes near a combustible gas source, the tick rate increases. In order
to isolate the source of a leak, you may need to move the wheel counter
clockwise, decreasing the sensitivity, as the sensor moves closer.
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Replacing the Batteries
Replace your 1.5 volt /size R14C(B) alkaline batteries when:
• The green READY light off
• No light or other activity occurs upon turning the instrument on
To replace the batteries:
1. Lay the instrument face-down on a back face.
2. Remove the battery cover. Apply upward pressure to the tab at the
bottom of the battery cover while lifting it out.
3. Remove the batteries using a coin or screwdriver, if necessary, to pry
them out.
4. Replace all three batteries with new ones.
Replacing the Sensor
Although the sensor is designed to offer many years of reliable service, it
may become inoperable if it is submerged in liquid or otherwise physically
damaged.
To replace sensor:
1. Turn the instrument off
2. Remove the upper tip guard by pressing straight up from the alignment
notch that separates the two halves of the tip guard.
3. This is a sturdy component, but use caution bending its leads.
4. Pull the sensor straight up from its tip housing.
5. Replace the sensor, pressing it straight in.
6. Reassemble in reverse order.
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SPECIFICATIONS
Sensitivity .................... 50 ppm methane
Sensor Type ................. Low power semiconductor
Warm Up Time ............. Approx. 5 minutes
Response Time………. Less than 2 seconds
Power Supply. ............. 3”C” cell batteries
Battery Life……………. 8 hours of continuous use, typical
Alarms ......................... Visible & audible at 10% LEL for Methane.
Can be calibrated for other concentrations
or gases (up to 40% LEL)
Duty Cycle ................... Continuous
Probe Length ............... 16"
Warranty ...................... 1 year
Operating Conditions
To ensure accurate readings use it only when ambient air is within this
range:
Temperature: 32 to 120°F
Humidity: 10 to 90% RH (non condensing)
GASES DETECTED
The SD-3300 detects a wide variety of gases, including some toxic gases,
and nuisance vapors. The following lists represents only a portion of the
more common gases it will detect.
o Natural Gas o Ammonia o Naphtha
o Propane o Gasoline o Lacquer Thinner
o Butane o Jet Fuel o Smoke
o Methane o Hydrogen Sulde
o Acetone o Industrial Solvents
o Alcohol o Carbon Monoxide
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