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BDA 04 is a safe and reliable coupling to connect calibration equipment to pressure sensors of EVCDs that are connected to a gas meter. When the link is made, the connection with the gas meter is temporarily interrupted and a link is created between calibration equipment and pressure sensor. As the calibration equipment is disconnected after the calibration process has been completed, BDA 04 automatically returns to the operational position, in contrast to the conventional three-way valve. Gas cannot escape during connection and disconnection.
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