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SMT-A2 - Wireless Data Loggers
The SMT-A2 is SMT's next generation wireless data acquisition unit built with the same high precision electronics and stable circuitry features as the WiDAQ but features integrated moisture, RH and temperature sensors as well as prolonged battery life and almost 10x the wireless communication range.
The SMT-A2 Wireless Data Acquisition unit is a high precision measurement device designed for distributed remote sensor data acquisition. The built-in 24-bit A/D converter and low noise high precision measurement circuitry facilitates data acquisition from a wide variety of sensors.
Integrated Moisture Content, RH and temperature sensors make the SMT-A2 suitable for building monitoring applications.
External sensor inputs, LCD display, large memory capacity and extended wireless range gives the SMT-A2 flexibility in a wide range of applications.
The SMT-A2 unit communicates wireless sensor readings to the SMT Building Intelligence gateway. Optional powered repeaters can be used to extend the wireless range.
- Remote sensor analysis and data collection
- High precision data acquisition
- Building science research
- Targeted repair monitoring
- Restoration monitoring
- Integrated moisture content sensing elements.
- Integrated relative humidity and temperature sensors.
- Two external resistance channels capable of reading wide moisture content ranges and precision thermistors.
- Sensor inputs use compact audio jacks for quick and simple connectivity.
- Internal memory capable of logging 340,000 data points.
- Auxiliary input for voltage measurement capable of reading 0-5V sensors.
- Wireless transceiver with 1000m line of sight communication.
- Communicates to SMT Building Intelligence Gateway (BiG) via USB to Wireless device; SMT-I2.
- Extreme low power device suitable for long term battery operation.
- USB connectivity supports data downloads and firmware upgrades.
- Backlit LCD user interface for easy network and sensor verification
- Rechargeable batteries via USB port.
|Working Frequency||2.4 GHz – 2.4835 GHz|
|Output Range (free air)||1000m. Powered repeaters can be added to extend range.|
|Max Nodes per coordinator||32 (dependent on application density and acquisition speed)|
|Life||2 to 2.5 years (hourly sampling)|
|Type||2 AAA Ni-MH Rechargeable. Eneloop HR-4UTGA|
|Capacity||Typical: 1600 mAh
Minimum 1500 mAh
|Self Discharge||75% after 3 years|
|Charging Cycles||Up to 1500|
|Memory and USB|
|Memory||16 Mbit EEPROM for data storage
Stores 340,000 data points.
|USB||USB 1.0 Interface|
|Operating Temperature||0° to 40°C / 32° to 104°F|
|Storage Temperature||-25° to 70°C / -13° to 158°F|
|Humidity||5% to 100% RH non-condensing|
|Electrostatic Discharge (ESD)||8kVdc air, 4 kVDC contact (exposed inputs)|
|Safety Requirements||SELV Separated Extra Low Voltage|
|Regulatory||Contains FCC ID: OA3MRF24J40MA
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Contains IC: 7693A-24J40MB
|Range||-40°C to +70°C|
|Internal Relative Humidity|
|Interchangeability||0-59% RH ±5%
60-100% RH ±8%
|10Ω to 100Ω
|100Ω to 100KΩ
|100KΩ to 1GΩ
|Range||0V to 5V|
The SMT-A2's handheld mechanical design is targeted for use in indoor applications. Mounting options are available for outdoor installations.
New Enclosure option:
We've customized a pelican to work with our A2 unit, creating a waterproof enclosure to keep our wireles data logger safe and dry. With one of these, you can use SMT technology in any enviroment.
External Port Connectivity For Restoration A2
|The restoration data logger contains integrated sensors for RH and temperature. Moisture content probes extend from the unit and are designed to be fastened to the material under test using #5 screws. An external HTM2500 RH/T sensor can be plugged into the voltage port located on the side of the unit. A USB charger can be connected to the USB port to charge the internal batteries and for connection to a host computer.|
External Port Connectivity For Research A2
|Resistance based and voltage based sensors can be connected to the external audio jack ports. On the left, a PMM sensor used for measuring moisture content and temperature is connected to the resistance port and a 0-5V RH sensor with temperature compensation thermistor is connected to the voltage port. Also connected is a USB charger used to charge the internal batteries and connect to a host computer.|
|Resistance Based Sensors
Plug resistance based sensors into the blue audio jack port (input 1/2)
Plug 0-5V Sensors into the white audio jack port. (input 3/4)
Thermistor or short must be connected between C and D to signal port is active.
|The main menu contains links to the submenus as shown below. The header reports the immediate status of the unit.|
|To join the network ensure BiG is running with an SMT-I2 USB to Wireless interface and select Network.
Joining network will be displayed, if joining was successful Joining Network on 25 will be displayed where 25 is the wireless channel, otherwise No Network will be displayed.
To rejoin the network select Join. To see the status of the network select Info from the main menu.
Measure Display - Restoration:
|Values are converted to moisture content, temperature and relative humidity. The associated temperature sensor used for temperature compensation is displayed next to each reading.|
Measure Display - Research:
|Resistance is in ohms and voltage in volts. Range will be adjusted automatically. Full values will be transmitted and stored in BiG.|