These sensors can be buried to any soil depth where moisture content needs to be read. The wires are attached to the portable WATERMARK meter that reads electrical resistance in the 0-200-centibar range. The WATERMARK meter is a solid-state alternating current resistance bridge meter that is adjustable for soil temperature variations. One meter is required to read all WATERMARK sensors. Meter has an LCD display, touchpad operating panel, durable case and field changeable cable assembly. Sensors are also easily interfaced with dataloggers. (Sensor protection required when interfaced with electronic logging devices.)
WATERMARK Electronic Module: Designed to interface WATERMARK sensors with individual 24VAC solenoid valves to provide soil moisture control to automatic systems. Fully adjustable from wet to dry, with “off” or bypass position for sensor control override. Can also be used to interrupt controller master valve circuit. Comes complete with two WATERMARK sensors. Other versions available that control groups of valves on common ground systems.
Sensors Sold Separately