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A. The MIDAS Meter® has been designed to be very user friendly. It can be easily used for leak detection by an operator after just 30 seconds of training. The PDA that comes with the handset requires additional training and this, along with the survey results downloading software on the PC forms the basis of most of the training course. Once the valve details are programmed into the PDA, it is incredibly easy to operate and a complete survey can be completed in 2-3 minutes per valve. My experience is that following the training course completion all technicians are comfortable using it to quickly and easily identify and quantify through-valve leaks.
A. Valve sizes from ½" to 50" NB can be surveyed
A. All types of valves which have an isolating function capability can be tested, including :-
A. The traffic light system built into the PDA is designed to act as a performance indicator as follows:
Note: Users set "acceptable limits / thresholds" (i.e. it these are user dependant/selectable) and Score Group accept no responsibility for the limits set by any end user.
A. See Technical Specifications here : Click Here
A. No – there is a threshold of leak detection. Very small leaks (less than 0.1 litres / min) may not be detected, because they do not make enough noise.
Note: All leak detection methods (such as pressure build up tests or looking for visible leakage) have a threshold of detection and uncertainty attached to the result.
A. When performing a test, the user needs to distinguish if the test is on gas, liquid or steam. Once known, this allows the correct fluid type to be selected in the PDA, to facilitate the automated leak rate calculation. Gas type or liquid density has a small effect on leakage quantification.
A. A valve must be in the closed position to carry out an AE leak detection survey. When the valve is closed, there will be no fluid flow, therefore the valve and piping will act as a separator. From the valve orientation, it can be determined if any leakage could be on gas or liquid.
A. The valve being tested must have isolating capability, it must be in the fully closed position and a differential pressure must exist across the seat to seal interface. The Acoustic Emissions (AE) Sensor on the front of the MIDAS Meter® handset must be brought into direct contact with the valve's metallic surface and that of the adjoining pipework, upstream and downsteam of the valve. The technique relies on finding the highest stable AE reading on the valve body so safe access for personnel is required. Lagging, if installed, must be removed for access in localised areas.
A. Yes. If the leakage is turbulent, it is possible to detect leakages with a differential pressure down to 1 bar or less. However this makes the leakage quantification more uncertain. Differential pressures of 10 bar and over produce more favourable results.
A. Battery life is typically 4 – 6 hours continuous use. With the built-in "Auto-off" function, this is more than enough to ensure the battery will last throughout a typical full working day The “Auto-off” function is set at 10 minutes, when no activity is detected by the device.
A. MIDAS Meter® detects acoustic emissions in the frequency range 60kHz to 600kHz. The human hearing range only extends up to 20kHz, so when you can hear noise, then you should have no worries about this interfering with your measured results, as it is in a different frequency range. MIDAS Meter® does not detect noise below 60 KHz. Concerns about background noise levels usually come from experiences of using lower frequency ultrasonic devices which have been seen in the past to give inconclusive results, since they pick up all low frequency noise (such as vibration and rotating equipment like pumps, bearings etc.), thus masking the high frequency signal that is generated by the leak path.