Improved accuracy and performance for flood warning systems
Overview
The AL200 is an ALERT2 encoder and modulator that supports ALERT2 and ALERT-concentration services. It meets the ALERT2 standards maintained by National Hydrologic Warning Council (NHWC) and ALERT Users Group (AUG). ALERT2 improves the accuracy and performance of flood warning systems and software, by providing you with faster data transfer, forward error correction, and a TDMA architecture.
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 data logger provides enhanced sensor support, user-defined logic and control, and data logging capabilities.
Read MoreBenefits and Features
- 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
- Support of encrypted ALERT2 messages; support of 250-millisecond slots
Images
3D/CAD Files:
Detailed Description
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).
Specifications
| 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 |
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| Current Drain |
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| 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 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 |
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| 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 |
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| Channels Available | TX, PTT, switched battery, ground |
| RCFSK Modulation | 100 to 1000 mV, ±50 mV (software selectable) |
Standards |
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| 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 |
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Compatibility
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Dataloggers
| Product | Compatible | Note |
|---|---|---|
| 21X (retired) | ||
| CR10 (retired) | ||
| CR1000 (retired) | ||
| CR1000X | ||
| CR10X (retired) | ||
| CR200X (retired) | ||
| CR206X (retired) | ||
| CR211X (retired) | ||
| CR216X (retired) | ||
| CR295X (retired) | ||
| CR300 | ||
| CR3000 (retired) | ||
| CR310 | ||
| CR350 | ||
| CR500 (retired) | ||
| CR5000 (retired) | ||
| CR510 (retired) | ||
| CR6 | ||
| CR800 (retired) | ||
| CR850 (retired) | ||
| CR9000 (retired) | ||
| CR9000X (retired) |
Additional Compatibility Information
The AL200 supports ALERT1 and ALERT2 protocols.
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