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ALERT121A Standard Remote Data Platform with CR800 and AL200
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The ALERT121A Standard is an advanced ALERT or ALERT2TM transmitter that is designed to be a drop-in replacement for existing flood warning stations. Designed to be flexible, reliable, and low cost, the ALERT121A Standard uses the AL200 modulator and sensor interface, the industry-standard Maxon SD125E-series radio, and the powerful CR800-series datalogger. The ALERT121A Standard includes standard circular connectors for sensor and power inputs, as well as cable glands for additional inputs.

The modular design of the ALERT121A Standard transmitter allows for alternate configurations, additional peripherals, and easy replacement of individual components. Because the ALERT121A Standard is built around the CR800 datalogger, many additional communications options are available. 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
  • Feature-rich ALERT and ALERT2 solution



-NOTE- For specifications, refer to:
  • 657.71 g (1.45 lb) for the CR800
  • 5.72 kg (12.60 lb) for the ALERT121A Standard


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

Case Studies

Panama Canal: Upgraded Flood Warning System
The Panama Canal was using an outdated water-level system until the Panama Canal Authorities (ACP) more
Texas: Hurricane Harvey
In February of 2015, Campbell Scientific was awarded a bid to supply the Harris more

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