The 223, manufactured by Delmhorst, is a cylindrical gypsum block that estimates soil water potential from -10 to -1000 kPa. It connects to a datalogger via an AM16/32-series multiplexer.Read More
The "-L" on a product model indicates that the cable length is specified at the time of order.
The 223 determines soil water potential by measuring electrical resistance. When the 223 is wet, electrical resistance is low. As the 223 dries, resistance increases.
The 223 cylindrical block is composed of gypsum cast around two concentric electrodes, which confine current flow to the interior of the block, greatly reducing potential ground loops. Gypsum located between the outer electrode and the soil creates a buffer against salts that may affect the electrical conductivity.
The 223 connects to a datalogger via an AM16/32-series multiplexer. Because the multiplexer contacts close only during measurement, electrical currents leading to premature degradation of the 223 are eliminated.
Campbell Scientific recommends removing the 223 during winter.
|Measurement Range||-10 to -1000 kPa|
|Calibration||Individual calibrations are required for accurate measurements. Refer to the sensor manual for more information.|
|Operating Temperature||Soil temperatures above freezing|
|Life Expectancy||Two freeze-thaw cycles|
|Electrode Description||Concentric cylinders|
|Cylinder Diameter||~2.25 cm (0.88 in.)|
|Cylinder Length||~2.86 cm (1.25 in.)|
|Weight||180 g (0.4 lb)|
Multiplexers that can be used with the 223 include the AM16/32B, AM16/32A (retired), AM16/32 (retired), and AM416 (retired).
Two single-ended channels and one excitation channel per probe are required; the channels are shared by several probes when routed through an AM16/32-series multiplexer.