For monitoring water level and wave height, NexSens AccuStage water level sensors are durable, easy to use, and require little maintenance. Users can choose between titanium or stainless steel constructions.
The sensors work by transducing water pressure into a millivolt charge, which can then be interpreted by data loggers as water level or wave height, depending on user needs. Two models of the sensor, vented or absolute, provide easy interfacing with NexSens iSIC or submersible data loggers. The sensors can communicate through Modbus RS485 or analog.
“They’re used in streams and lakes most commonly,” said Kevin Stevens, product manager. “Many customers use deployment pipes, just to keep it more secure, and some also use conduit to protect the cable.”
Stevens says Modbus RS485 is used most commonly because digital communication tends to be more reliable over analog communication, especially where voltage levels could drop over longer cable runs.
The vented water level sensor wires into NexSens iSIC data loggers and compensates for atmospheric pressure to give a more accurate level (depth) reading. “Just hook up four wires in the iSIC,” said Stevens.
For users wanting absolute depth, the absolute water level sensor easily plugs into NexSens submersible data loggers with an underwater connectorized cable. It comes unvented to maintain a watertight seal.
Maintenance is fairly minimal, says Stevens. But if an AccuStage is deployed in a high fouling environment, a hard-water stain remover can be used to gently clean the sensor. Users can make two solutions of cleaner – one at full strength and the other at half. Simply dip the sensor in the strongest solution and stir for about 30 seconds. Do the same with the second solution. Then rinse the AccuStage with clean water and dry with a soft rag.
Besides an occasional cleaning, Stevens says to give proper care to the sensor cable to make sure there aren’t any cuts in the jacket that could let moisture in. Any defects in material and workmanship are covered by a 1-year warranty.
“Keep it clear of debris, make sure lines are untangled and keep the wiring secure,” said Stevens. “It’s a fairly simple sensor.”