AL200 ALERT2 Encoder, Modulator, and Sensor Interface
ALERT2 Ready
Improved accuracy and performance for flood warning systems
meteorología aplicaciones agua aplicaciones energía aplicaciones flujo gas y turbulencia aplicaciones infraestructuras aplicaciones suelo aplicaciones


The AL200 is an ALERT2 encoder and modulator that provides ALERT2 and ALERT-concentration services. The AL200 meets the ALERT2 standard released and maintained by the National Hydrologic Warning Council (NHWC) and the ALERT Users Group (AUG). This new standard has been designed to improve the accuracy and performance of flood-warning systems and software by providing data faster than traditional ALERT systems.

With integrated sensor inputs, the AL200 allows you to create a minimal ALERT2 transmitter/station, decreasing the cost of a typical flood-warning system. Combining the AL200 with a Campbell Scientific datalogger provides enhanced sensor support, user-defined logic and control, and datalogging capabilities.

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Ventajas y características

  • Easily configurable with graphical, point-and-click software
  • Integrated sensor inputs for greatly reduced station cost
  • Onboard measurement of supply voltage, clock/GPS quality
  • Event or schedule driven reports for battery, clock, tipping bucket, voltage, current, SDI-12, high/low state
  • Screw terminals for power, radio, and sensors for easy cabling
  • Easy access test features for transmission, radio power, and alignment


Descripción detallada

Channels Available and Their Functions

  • P1: Tipping Bucket / Switch Closure Count Accumulator
  • SE1: Single-ended Analog Input, millivolt or milliamp
  • C1: Digital for limited SDI-12
  • SW12: Switched power for powering sensors
  • G: Ground

ALERT2 Reporting

When used standalone, the AL200 can generate time and event driven reports for Battery, Clock Status, Tipping Bucket, Analog Input (mV or mA), Digital (SDI-12).


Power Connector Two-wire, 0.15-in. pitch removable terminal (reverse polarity protected)
Power Requirements 9 to 18 Vdc
Configuration Device Configuration Utility over USB (settable modulation levels using Device Configuration Utility)
LEDs GPS, Serial, Radio (RS-232 and CS I/O share serial activity LED.)
CS I/O Port SDC 7, 8,10, or 11 (multiplexed with on-board sensor interface)
RS-232 Port DCE
USB Port Micro-B
Temperature Range -40° to +60°C
Communication Rate
  • 1200 to 115,200 bps (RS-232 DCE Port)
  • 9600 to 57,600 bps (CS I/O Port)
Current Drain
  • 1.5 mA (@ 12 Vdc when idle)
  • 40 mA (@ 12 Vdc during GPS fix)
  • 35 mA (@12 Vdc during transmit)
Timekeeping Setting via GPS ±61 μs
Drift ±0.17 s/day (without GPS sync, 40°C temperature change)
Analog Input (SE1) Sensor Interface 0 to 5 Vdc (16-bit ADC; millivolt or 4 to 20 mA selectable)
Protocols Supported ALERT(1) and ALERT2
SMA Connector Active GPS socket (female) antenna
Test Button Test transmit and tone
Dimensions 16 x 7.7 x 2.2 cm (6.3 x 3.0 x 0.9 in.)

Sensor Interface

Channels Available Switch closure (P1), single-ended analog (SE1), limited SDI-12 (C1), switched 12 V, ground
Analog input (SE1) 0 to 5 Vdc, 16-bit Adc (millivolt or 4 to 20 mA selectable)

Radio Interface

Channels Available TX, PTT, switched battery, ground
RCFSK Modulation 100 to 1000 mV, ±50 mV (software selectable)


ALERT2 ALERT2 IND API Specification Version 2.0 (as released by the ALERT2 Technical Working Group dated June 2020)
Compliance RoHS and CE
Product Standard EN 61326-1:2013
Test Standards
  • IEC 61000-4-2, Electrostatic Discharge Immunity
  • IEC 61000-4-3, Radiated RF Immunity
  • IEC 61000-4-4, Electrical Fast Transients Immunity
  • IEC 61000-4-5, Surge Immunity
  • IEC 61000-4-6, Conducted RF Immunity
  • CIPSR 11, Class B Emission


Nota: lo siguiente muestra información de compatibilidad notable. No es una lista de todos los productos compatibles.


Producto Compatible Nota
CR1000 (retired)
CR200X (retired)
CR216X (retired)
CR3000 (retired)
CR3000 (retired)
CR3000 (retired)
CR5000 (retired)
CR800 (retired)
CR850 (retired)
CR9000X (retired)

Información de compatibilidad adicional

Datalogger Considerations

CRBasic Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR5000 CR9000(X)

Standalone, Sensors Attached Directly To AL200

A standalone AL200 can measure:

  • Analog sensors with 0 to 5 V or 0 to 20 mA output
  • SDI-12 sensors
  • Float / contact switch sensors
  • CS451 and CS456 Pressure Transducers
  • CS475, CS476, and CS477 Radar Water-Level Sensors
  • CS460 Pressure Transducer
  • SR50A Sonic Ranging Sensor
  • CS11 AC Current Sensor


ALERT Configuration Tool v.1.1 (47.7 MB) 30-06-2016

A software utility used to configure the ALERT210. 

Casos de aplicación

Panama Canal: Upgraded Flood Warning System
The Panama Canal was using an outdated water-level system until the Panama Canal Authorities (ACP)......leer más
Texas: Hurricane Harvey
In February of 2015, Campbell Scientific was awarded a bid to supply the Harris County......leer más
Texas: Transitioning to ALERT2
ALERT2 is a modern communication protocol that improves upon 40 years of tradition within the......leer más

Artículos y notas de prensa