ALERT121A Basic Remote Data Platform with AL200
Turn-key ALERT system
Fully configurable and programmable for flood warning applications
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications


The ALERT121A is a basic ALERT or ALERT2TM transmitter that is designed to be a drop-in replacement for existing flood warning stations. Designed to be simple, reliable, and low cost, the ALERT121A Basic uses the AL200 modulator and sensor interface, as well as the industry-standard Maxon SD125E-series radio. The ALERT121A Basic includes standard circular connectors for sensor and power inputs, as well as a cable gland for additional inputs.

The modular design of the ALERT121A Basic transmitter allows for alternate configurations, additional peripherals, and easy replacement of individual components. Any ALERT121A-series transmitter can be converted between ALERT (legacy) and ALERT2TM protocol with a simple firmware change.

Note: ALERT2 is a trademark of the National Hydrologic Warning Council.

Benefits and Features

  • ALERT-style canister, making it a drop-in upgrade for existing stations
  • Modular mounting of components for easier field servicing and expansion
  • Sealed, circular sensor connectors on lid of canister
  • Cable-entry seals for routing sensor or external communications cables
  • Integrated battery bracket that can accommodate up to a 26 Ahr rechargeable battery
  • Field configurable—no programming required
  • Lowest-cost ALERT2 solution



-NOTE- For specifications, refer to:
Weight 4.94 kg (10.90 lb)


The ALERT121A system is ALERT (Legacy) and ALERT2TM compatible.

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