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

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Multi Gas Leak Detector <strong>MGLD.3000</strong> Operating instructions OK - Save the correction factor in the probe. Cancel and return to the previous leak search menu If the sensitivity is outside the specified tolerance limits, this is indicated by a pointer that is at either red end of the scale on the left or right. The functional test was not passed. The correction factor was set to the maximum limit. Start the new test by pressing the "Start" button Cancel and return to the previous leak search menu If the test is run several consecutive times without a passing result, the following procedure can be followed: • Make sure that the Teflon tip was being held fully in front of the gas outlet of the reference leak and that there is no air movement in the environment • Make sure that the reference leak is opened for long enough to be completely permeated by the test gas (follow manufacturer instructions) • Make sure that the pressure of the test gas is consistent with the reference leak manufacturer's specifications • Restart device and repeat test (when the device is started the sensor and the gas sensor system are initialized) • Contact technical support BAL_MGLD3000_20101001_en.doc 34-54
Multi Gas Leak Detector <strong>MGLD.3000</strong> 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. BAL_MGLD3000_20101001_en.doc 35-54
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Vulkan Lokring MGLD.3000 Product Manual - Schoonover, Inc.

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