Precision Diagnostic Instruments, PDI Combustible Gas Leak Detector LD-150

Description

Precision Diagnostic Instruments, PDI Combustible Gas Leak Detector LD-150
Introduction
The LD-150, Combustible Gas Leak Detector, has a long, slim gooseneck probe to find leaks in tight areas. Its adjustable alarm, easy one-hand operation and impact resistance storage case add up to value and convenience
Applications and Features
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 sensitivity (alarm rate) helps eliminate background gas concentration in contaminated environments.
•
Highly sensitive, can detect down to 50 ppm methane.
•
Adjustable sensitivity (alarm rate) to locate leaks quickly and easily.
• Visual
leak detection by LED indicator.
• Precision sensor detects even the smallest leaks
.
• Fast response of less than two seconds to 40%
LEL.
• Includes earphone j
ack.
•
16
”
flex-neck probe.
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. However, it is important to treat every situation with extreme caution and always follow all the proper safety practices and precautions. Failure to do so could result in damage to the unit, personal injury or death.
WARNING!
If you feel an explosion hazard exists:
• Arr
ange 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
operate power switches or energize circuits in area of question
As a matter of routine, ventilate the area in which you plan to work. 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).
Controls and Indicators
Sensor Tip Guard & Sensor (internal)
Gooseneck Probe
Alarm Light
Ready Light (Power-On)
Power ON/OFF Slide Switch
Earphone Jack
Sensitivity Adjustment Wheel
Gooseneck Clip
Hand Handle
10. Battery Compartment & Cover
Instructions
Switch on the combustible gas leak detector by sliding the ON/OFF switch to the right. The READY light should glow green. 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 initially sound without contact with any gas. This is caused by the high sensitivity preset of the Sensitivity Adjustment Wheel. Adjust sensitivity to lowest setting. If the alarm does not stop within 30 seconds, your unit may need service.
Sensitivity Adjustment
Each time the instrument is put into service, you should conduct a quick functional test. Adjust the sensitivity to non-alarm level. Then expose the sensor to a known combustible gas source, like a cigarette lighter, or pass the probe over a drop of combustible fluid. After the initial test and warm-up, the instrument can be used to detect combustible gas. When the sensor in the probe tip detects a combustible gas, the alarm rate will increase and the instrument sounds a warbling tone while the ALARM light glows. As the concentration of gas increases so does the alarm 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 on the side of the instrument.
Note: Listening to the alarm through earphones is very loud.
If the
READY
light does not glow green, the batteries might be low. They should be replaced
immediately. Low batteries will adversely affect the
instrument’s reliability.
For more information, see the Battery Replacement procedures.
Adjusting the Alarm Rate (Sensitivity)
The alarm rate tells you when the sensor (in the tip of the instrument) is getting close to a combustible gas. You can control the alarm rate using the sensitivity adjustment wheel in the center of the instrument.

Turn the wheel clockwise to increase the frequency.

Turn the wheel counter-clockwise to decrease the frequency.
An alarm rate of 4 to 8 tics per second, in fresh air, is typical. The rate of alarm increases as the sensor comes closer to a combustible gas source. 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 to the leak source.
Replacing the Batteries
Replace your 1.5 volt/size
“C”
alkaline batteries when:
• The gree
n
READY
does not illuminate.
• No light or other activity occurs
when powering on the instrument.
Specifications
Sensitivity
.................
50 ppm methane
Sensor Type
.
.............
Low power semiconductor Warm Up Time
...........
Less than 1 minute Response Time
..........
Less than 2 seconds
Duty Cycle
.................
Continuous
Probe Length
.............
16" gooseneck
Power Supply
.............
3 x
“C”
Alkaline Batteries Battery Life
................
8 Hours, Continuous Use Alarm
........................
Visible & Audible at 10%
Dimensions Weight Warranty
Operating Conditions
LEL for Methane. Can be calibrated for other concentrations or gases.
221mm x 72mm x 46mm 498g
2 years
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 LD-150 detects a wide variety of gasses, including some toxic gasses, and nuisance vapors. The following list represents only a portion of the more common gasses it will detect.
o
Natural Gas
o
Propane
o
Butane
o
Methane
o
Acetone
o
Alcohol
o
Ammonia
o
Steam
o
Carbon Monoxide (not to quantify)
o
Gasoline
o
Jet Fuel
o
Hydrogen Sulfide
o
Smoke
o
Industrial Solvents
o
Lacquer Thinner
o
Naphtha