Vulkan Lokring MGLD.3000 Product Manual - Schoonover, Inc.

Multi Gas Leak Detector MGLD.3000
Operating instructions
Check and calibration results
Warnings / functions
Warning symbol - blinks
during check and calibration
Probe is initialized
Date and results of the last 10 functional tests are logged for each probe.
Return to the previous leak search menu
Return to the previous leak search menu
Environment setting
In addition to the sensitivity of the hand probe, there is a second factor that must be taken into account for
a successful leak search.
To determine the size of a leak, it is necessary that wherever possible the entire gas quantity that flows
through the leak within a specific time unit is detected by the hand probe of the leak detector and can thus
be detected by the gas sensor. The transfer path from the leak to the leak detector is directly determined
by the air flow in the surrounding air. There are different flows in the surrounding air in different environments
(e.g., wind during a leak test conducted outdoors, a continuous air draft caused by air-conditioners
in indoor spaces). The larger the flow in the surrounding air, the less gas flowing from the leak that
reaches the gas sensor in the hand probe. However, to enable a leak search to be conducted in variable
environmental situations, a transfer function can be selected from the leak to the gas sensor which by
means of a mathematical procedure increases the measured concentration within specific limits and in this
way should indirectly account for the gas portion not reaching the gas sensor.
The change in selectivity is another way of detecting leaks adapt to specific environmental conditions.
Setting a high selectivity allows a separation between the refrigerant gases of the detectable probe. A
strong separation, however, can usually only be achieved under non-congested environment with very low
background concentrations of other detectable gases from the gas sensor (eg, hydrocarbons, hydrogen).
Setting a low selectivity allows detection of leaks, even under polluted ambient conditions. This setting,
however, the separation between the different refrigerants is reduced.
A too high setting can affect the selectivity of detection of leakage in polluted environments and
the output to low concentrations or leak.
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