The Model 2590 Precipitation Detector is used to detect the onset of rainfall. A gold plated grid sensor activates the circuit when water is deposited onto the grid. The presence of water activates an internal relay that may be used to operate larger capacity external relays, alarms, doors, or may be used as an input to a data acquisition system.
An internal heater constantly dries the grid to prevent relay activation during times of dew, fog, or light moisture that is not actual precipitation. During periods of normal precipitation the heater is unable to dry the grid and the relay is activated. The heater power may be disconnected allowing the detector to be operated as a leaf wetness sensor.
The solid state electronics are mounted in a sealed weatherproof enclosure. The precipitation detector may be tilted to allow water to drain off. A mounting bracket is provided with the sensor to allow mounting onto a 1" pipe by a U-bolt. The wind screen may be used to prevent premature drying of the grid during precipitation events accompanied by high winds.
The unit requires +12 Vdc power for operation. A 115 Vac power adapter is provided with each unit. Power adapters for voltages other than 115 Vac are available upon request.
Sensor: Gold plated grid 4" dia
Output: Relay (0.5 amps)
Heater: Resistive element
Power: 12 Vdc (235 mA max) 115 Vac 60 Hz adapter supplied, optional 220 Vac 50/60 Hz adapter available
Size: Overall 4" dia x 2" high
Weight/shipping: 4 lbs/5 lbs (1.8 Kg/2.3 Kg)