DAVIS WeatherLink Irrigation Add. - Manual (Page 13)

13
Contact Specifications
The “contact” closure is provided by a photo-coupled MOS device. Because
it is a solid-state device, it is not subject to arcing and contact-welding as are
mechanical relays. However, since it is a solid-state device, it will be
damaged by operation beyond its ratings, which are:
Nominal Load Voltage: 28 V AC or 48 V DC, Maximum
Peak Voltage:
± 60 V, Maximum
Load Current: ± 1.8 A, continuous Maximum at 77°F (25°C),
derated to 0.7 A at 185°F (85°C)
ON Resistance: 0.12 Ohm, Maximum
Note: Upon power up (powering the Vantage Pro Console™ or Weather
Envoy™), the datalogger will briefly test all four outputs by closing the
circuit (turning on the output). It is recommended that you disconnect any
equipment attached to the datalogger outputs before rebooting the Vantage
Pro Console™ or Weather Envoy™.