Besantek GD-3300 User manual

User’s Manual
Combustible Gas Leak Detector
Model GD-3300
Introduction
The Combustible Gas Leak Detector has a long, slim gooseneck probe to find leaks in tight
areas. It’s adjustable alarm, easy one-hand operation and impact resistance storage case
add up to value and convenience
Applications and Features include
Easily operate the Combustible Gas Leak Detector with one hand to detect presence of combustible gases.
Audible and visual indicators help pinpoint leak source. Adjustable “tic” rate helps eliminate background gas
concentration 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 gasses 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.
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 is possible
• Ventilate enclosed areas if possible to do so without risk of ignition
• DO NOT switch power switches on in area of 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)*
LEL: Lower Explosive Limit - The point at which a combustible gas, when mixed with air, has
developed the minimum concentration to combust 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) in a
International Symbols
Important Information; see manual
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. Tic Rate (Sensitivity) Adjustment
8. Probe Clip
9. Hand handle
10. Batteries cover
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Instructions
Switch on the gas-leak detector by sliding the ON/OFF button and the READY light is glowing.
The Combustible Gas Leak Detector runs through a one-minute warm-up and self-zeroing
sequence when it is first turned on in fresh air. The alarm of the instrument may very loud
without contact any gas. That is caused by the high Tic Rate preset in rotary wheel.
Rate (Sensitivity) Adjustment
Each time the instrument is put into service, you should conduct a quick functional test. Adjust
the Tic Rate to non-alarm level. Then, simply expose the sensor to a known leak, like a
cigarette lighter, or pass the probe over a drop of combustible fluid. After the initial warm-up,
the instrument can be used to detect combustible gasses. When the sensor in the probe tip
detects a combustible gas, the tic rate will increase and the instrument sounds a warbling
tone while the ALARM light. As the concentration of gas increases so does the tic rate.
If the situation calls for quiet operation, or if background noise makes it difficult 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 tic 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 the replacement procedures.
Adjusting the Tic Rate(Sensitivity)
The tic rate tells you when the sensor (in the tip of the instrument) is getting close to a leaking
gas. You can control the tic rate using the rotary wheel in the center of the instrument.
zMove the wheel clockwise to increase the frequency
zMove the wheel counter-clockwise to decrease the frequency
A tic rate of 4 to 8 tics per second, in fresh air, is typical. As the sensor comes near a
combustible gas source, the tic 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.
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.
Specifications
Sensitivity…………….. 50 ppm methane
Sensor Type…………. Low power semiconductor
Warm Up Time……….. Approx.5 minute
Response Time………. Less than
Power Supply…………. 3”C” cell batteries
Battery Life……………. 8 hours continuous use, typical
Alarm……………………Visible & Audible at 10% LEL for Methane. Can be calibrated for
other co2sec. (up to 40% LEL)
Duty Cycle…………….. Continuous
Probe Length………….. 16"ncentrations or gases.
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)
Gasses Detected
The GAS detects a wide variety of gasses, including some toxic gasses, and nuisance vapors.
The following lists represents only a portion of the more common gasses it will detect.
Combustible:
oNatural Gas
oPropane
oButane
oMethane
oAcetone
oAlcohol
oAmmonia
oSteam
oCarbon Monoxide (not to quantify)
oGasoline
oJet Fuel
oHydrogen Sulfide
oSmoke
oIndustrial Solvents
oLacquer Thinner
oNaphtha