The latest two devices are battery-powered (coin cell style) and the battery lasts 3-6 months, working 24/7.

By connect I mean I can launch VictronConnect and see from the Device List the basic live reporting information sent from the shunt. So far so good. It's doing what I hoped it would do. In vitro hydrodynamic properties of the miethke ProGAV hydrocephalus shunt. Cerebrospinal Fluid Res. 2006; 3( 1):9. [ PMC free article] [ PubMed] [ Google Scholar] Example: If a current of 12A is drawn from a fully charged battery for a period of 3 hours, the readout will show -36.0Ah (-12 x 3 = -36).Before we even get to the settings, please note that these three parameters work together to determine when your battery is at 100% State of Charge (SOC):

The auxiliary input can be used to monitor the voltage of a second battery or the midpoint of a battery bank. The auxiliary input can also be used for battery temperature monitoring, together with the optional Temperature sensor for BMV. Siphon resistive devices. (a) Membranous devices include a pressure sensitive membranous compartment. (b) Gravitational mechanisms include a mass-spring system that reacts to gravity and regulates the opening of a valve. The SmartShunt 500A is an all in one battery monitor, only without a display. Your phone acts as the display. The SmartShunt connects via Bluetooth to the VictronConnect app on your phone (or tablet) and you can conveniently read out all monitored battery parameters, like state of charge, time to go, historical information and much more. The Victron manual states: The “charged voltage” parameter should be set to 0.2V or 0.3V below the float voltage of the charger. The Codman Hakim Programmable Valve (CHPV), also known as the programmable Medos shunt, is a double spring ball valve, where the inlet valve controls the total pressure [ 13]. This specific section consists of a synthetic ruby ball depressed in the valve seat by a 316L flat stainless-steel spring. Opening pressure of the valve is adjusted by raising the spring on a spiral polyethersulfone staircase using the magnetic field from an external handheld apparatus [ 14]. The CHPV has a range of 30 to 200 mm H 2O, with incremental steps of 10 mm H 2O. To confirm the valve setting, plain skull radiography may be needed after shunt pressure adjustment. The Codman Hakim valve can withstand up to a 3 Tesla magnetic field, although the valve must be immediately readjusted after exposure to such a field to avoid complications such as a changed shunt setting from the magnetic interference or permanent disability of the valve [ 13]. In one documented study, the Medos valve behaved very well with one-third of the valves remaining fixed after being exposed to an external magnetic field of 1.5T from an MRI [ 15]. Despite this, the study conducted still found causes of concern as in 11 of 15 occasions, when valves were set to a starting value of 200 mm H 2O, the magnetic field induced by the MRI caused the flat spring of the valve to move across the top of the cam and fall to a level below 30 mm H 2O. A drastic reduction in the pressure setting from 200 mm H 2O to 30 mm H 2O could lead to siphoning of CSF and deleterious effects on the patient, such as subdural hematomas. One of the five Medos valves tested was no longer programmable after four test runs in the MRI. Attempts to reprogram the valve were conducted after 12 hours and 30 days, both of which failed to resolve the issue.

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Please note that if the "Consumed Ah" reading indicates three dashes: “---” this means that the battery monitor is in an unsynchronised state. This mainly occurs when the battery monitor has just been installed or after the battery monitor has been left unpowered and is powered up again. For more information, see the Synchronising the battery monitor chapter.