Introduction
LD239 electronic leak detector is highly sensitive instrument designed for use with the laboratory
equipment especially for detection of traces of helium or hydrogen gas leaks in GC environment.
In general, LD239 can detect leaks of any gas with thermal conductivity largely different from the
reference gas (air). The detector indicates leaks via an LCD display, LED lights and an audible
alarm.
The detector’s sensitivity strongly depends on the difference between the thermal conductivities
of gas and air (reference gas). The higher the difference, the higher the sensitivity. The gas type
and humidity should also influence the detector sensitivity. A table below lists thermal
conductivity of some common gases in W / m·K·10
-3
at 0° C, 101.325 kPa.
*Undetectable gases.
Warnings, Cautions and Notes
This section explains the warnings and cautions that should be observed when operating LD239.
Safety information is covered in this section and at relevant points throughout the manual. Please
read this manual in its entirety before operating the instrument.
Warnings, precautions and notes are indicated by the following conventions:
WARNING! Indicates a potentially hazardous situation, which, if not avoided,
could result in moderate to serious injury or possibly death.
CAUTION! Indicates a potentially hazardous situation, which, if not avoided,
could result in minor injury or equipment damage.
NOTE Emphasizes additional information that is provided to ensure
proper use of this instrument.
2.1 General Warnings and Cautions
WARNING!
LD239 is not an explosion-proof instrument. Do not use the detector in areas at
risk of fire, explosion or large flammable gas leaks!
Do not use the detector in areas that are contaminated with dust or combustible
fumes!
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