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Hydraulic fracturing, or fracking, pumps a liquid mixture into wells drilled into shale to make it easier to extract natural gas. But controlling that process to keep it safe and productive takes constant monitoring. To help in that task, drillers often use MBS pressure transmitters from Danfoss, Baltimore, to control the pump intake, lubrication oil, and filter pressure on fracking setups. MBT pressure sensors, also from Danfoss, monitor hydraulic fluid, lubrication oil, and water in the cooling system.