# Sentinel Liner Guard > The Sentinel monitors three distinct parts of the lining process: pressure of the liners, power supply and water levels in pumping stations, and also features a remote alarm. The Sentinel sends a text... The Sentinel monitors three distinct parts of the lining process: pressure of the liners, power supply and water levels in pumping stations, and also features a remote alarm. The Sentinel sends a text message alert via the GSM network to a cell phone should there be a power outage, fluctuation of the pressure outside the limits, or should the water level in a pumping station rise too high. The Sentinel settings are easily adjusted by GSM commands. Pressure data can be requested via text message. - 2x pressure connectors, - 1x water level monitor (upgradeable), - power supply monitoring 110-230v / 50-60Hz, - 3-phase powers supply monitoring 400v / 50-60Hz and 3-phase alarm (sound, text message & call). - Illuminated LCD screen with polycarbonate shield, - military grade connectors, - battery back-up, - user adjustable GSM numbers, - user adjustable limits for high/low pressure with values lP67 sealed closed and lP64 open. - CE & FCC approved. ##### How Does The Sentinel Liner Guard Work? 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