The JSA State of charge sensors (US patent #6,356,675) are special purpose refractometers designed for lead acid wet cell battery use. These inexpensive units will accurately determine state of charge levels in the cells of an open port batteries and may be easily adapted for use in sealed wet batteries. Suitability for use in Gel or glass mat batteries has not been determined. The sensors provide an analog DC output voltage approximately proportional to the state of charge which may be calibrated in any user convenient units including specific gravity. The sensor active element must be fully immersed in the electrolyte for satisfactory operation. See diagram below for dimensions. Users may calibrate the sensor in % of SOC or specific gravity. Configurations available include OEM for user packaging or a standard battery cap version as shown here.Several upgrade options are available for either Battery Cap or OEM sensor versions: The sensor requires 5 VDC regulated input however an on-board regulator option is available enabling the user to supply power from a battery or other unregulated 6-35 VDC source.A level sensing option is available whereby the sensor will approximately determine the fluid level of the electrolyte below a user determined reference level.An on-board environmental temperature sensor option is available with RT curve J calibration factor. An immersion temperature sensor option is available with RT curve Z calibration factors.

JSA will soon offer a low cost in-line process control refractometer.

JSA Will soon offer hand-held, battery powered, special purpose refractometers