Hydro-Rain Wireless Rain/Freeze Sensor

Hydro-Rain Wireless Rain/Freeze Sensor

Ask A Question
Product Files
Product Description

HRC 100 RS RF Wireless Rain Sensor

Hydro-Rain®’s HRC 100 wireless rain or rain/freeze sensor saves water by automatically suspending irrigation watering cycles when it rains or freezes or both!

Features and Benefits

  • Easy No Tools Required—Rain gutter mount bracket is equipped with a tool free bolt system that is both quick and intuitive to install.
  • Adjustable Moisture Activation—1/8", ¼", ½", ¾", 1" rainfall settings for variable climates.
  • Hygroscopic Discs—Absorb water to activate rain switch.
  • Reliable Freeze Sensor Option—Shuts off timer when temperature drops to 37°F, protecting vegetation from the effects of freezing water.
  • Universal—For use with most brands of 24 Volt sprinkler timers.
  • Quick Rain Gutter Mount—No tools required for mounting the sensor to a rain gutter.
  • Constant Communication—Every 30 seconds, (HRC 300/390 models), a signal between the transmitter and receiver for accurate timed water metering. All other timers transmit updated signal every 15 minutes.
  • Transmission Range—Over 300 feet (91.4 m) line of sight.
  • Manual Bypass Control—Allows for deactivation during sprinkler system maintenance.
  • Dry Vent—Allows air to be circulated or dampened for fast or slow dry, effectively reducing time for the next watering cycle.

Operating Specifications

  • Sensor Type: Industry-standard hygroscopic discs
  • Rain Sensitivity: Adjustable nominal 1⁄8" to 1" (3-25mm)
  • Freeze Sensitivity: 37°F (2,7°C) +/- 3°F
  • Operating Temperature: 14° F~140° F ( -10° C~60° C)
  • Housing Material: UV-resistant
  • Receiver Power: 22-28 VAC
  • Transmitter Power: Two CR2032 3V cell, 5-year life


  • Transmitter: Height: 4" (10,1 cm)
  • Length:  3.15" (8,0 cm)
  • Receiver: Height: 3.75" (9,5 cm)
  • Length: 1.1" (2,7 cm)

Electrical Specifications

  • AC Supply: 24~26VAC
  • Relay Contacts Output: Normal Open and Normal Close 3A@24VAC