ALERT2 Data Transmitter – Model 3306-02-NM and 3316-02-NM

SKU: 3306-02-NM or 3316-02-NM Categories: , Tag:

The ALERT2 Data Transmitter – Model 3306-02-NM/3316-02-NM designed with the field technician in mind.


  • Forward error correction
  • Full engineering values
  • TDMA reporting eliminates collisions
  • Easily programmed with included Insight software

ALERT2 Data Transmitter

ALERT2*, the latest generation data format for hydrological and meteorological data collection systems, utilizes faster baud rates for transmission and enables more data to be sent in shorter messages. This increase in data capacity allows for the transmission of field data in calibrated, floating-point engineering units, and also provides a tremendous increase in the number of available Station IDs.

Another significant advancement offered by ALERT2 is the ability to assign TDMA (Time Division Multiple Access) time slots for each transmitter and repeater. TDMA eliminates data loss due to collisions and ensures exceptional system data throughput even during extreme weather events. This transmission scheduling capability is possible due to the precise timekeeping enabled by the on-board GPS receiver. The increased message capacity of ALERT2 also allows for the inclusion of forward error correction to help minimize transmission errors that can occur over noisy channels.


  • Sends more data with shorter messages by utilizing the faster baud rate
  • Exceptional system data throughput even during extreme weather events
  • Accurate data with the use of full error detection and forward error correction = good data or no data
  • Synchronize reports based on the use of Time Division Multiple Access (TDMA)


*ALERT2 is the latest generation data protocol for hydrologic systems administered by the ALERT2 Technical Working Group of the U.S. National Hydrologic Warning Council.



Sensor inputs Analog, 2 Precipitation, 2 Shaft Encoder, 2 SDI-12, Wind. Battery Voltage and Wind Gust (if wind sensor is enabled) are internal sensors which use one of the available analog inputs)
Total number of sensor inputs Up to 50 parameters
Analog Resolution 12 bits (0.0012 V)
Sampling Interval 0 seconds to 18 hrs, programmable
Reporting modes Timed-defined and/or event
Reporting interval 0 seconds to 596523 hrs, programmable
Event change to report 0 to 65535 counts
Reporting override value 0 to 65535 counts
Data logging modes Timed-defined and/or on transmission
Data logging interval 0 seconds to 596523 hrs, programmable
Data format ALERT2 Binary Standard
Recorded data Integer or floating point
Record size Integer: 9 bytes/record
Floating point: 11 bytes/record, one file per month containing all sensors
Memory 16GB SD Card
Real-time clock Clock/calendar with on-board battery back-up with leap year correction, syncs with GPS
Transmission baud rate 4800
      Slot size Selectable: 0.5, 1, 1.5, 2.5, 3, and 5 seconds
      Frame Size Selectable: 15, 30, 45, 60, 90, and 120 seconds
On-Board GPS Receiver
      Sensitivity < -163 dBm
      Channels 48
      GPS connector SMA Female
Radio frequency range VHF 136 to 174 MHz at 5W, UHF and other bands available
Operating voltage 12 to 18 VDC
Current draw < 3 A transmitting, < 1.8 mA standby
Battery 12 VDC, 12 Amp hour
Lightning protection Standard on all inputs
Antenna connector BNC
Operating temperature range -40° to 140° F (-40° to 60° C)
Storage temperature range -58° to 158° F (-50° to 70° C)


Refer to Ordering Guide for additional information for Models 3306-02-NM and 3316-02-NM


Ordering Guide

Ordering Guide

3306-02-NM 3316-02-NM
Analog inputs 6 8
Input connectors MS MS
Enclosure Aluminum cannister Fiberglass water-resistant
Dimensions 7 x 17 in (17.8 x 42.2 cm) 12 x 14 x 5.5 in (30.5 x 35.6 x 14 cm)
Weight (includes battery) 15 lbs (6.8 kg) 14.5 lbs (6.6 kg)
Estimated shipping weight* 19 lbs (4.5 kg) 18.5 lbs (9.1 kg)


*Battery shipped separately



Support Documents



Firmware and Software Updates

Note: To request access to the firmware and applications downloads, you must use your work e-mail address with your organization’s domain.

Download the ZIP file for access to the following files:

  1. Firmware binary *.hex
  2. Insight software installation *.exe


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