Building Intelligence

SMT-A2 - Wireless Data Loggers

Price: $299.00

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.

Download Datasheet

Installation Guide

SKU: SMT-A2

Overview
Specs
Mounting
Connectivity
Screenshots

Overview

General Description

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.

Applications

Remote sensor analysis and data collection
High precision data acquisition
Building science research
Targeted repair monitoring
Restoration monitoring

Features

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.

Specs

Electrical

Wireless
Specification	IEEE 802.15.4
Working Frequency	2.4 GHz – 2.4835 GHz
Power	20dBm (100mW)
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)
Battery
Life	2 to 2.5 years (hourly sampling)
Battery
Type	2 AAA Ni-MH Rechargeable. Eneloop HR-4UTGA
Max Voltage	3V
Capacity	Typical: 1600 mAh Minimum 1500 mAh
Self Discharge	75% after 3 years
Charging Cycles	Up to 1500
Charger	USB 5V
Memory and USB
Memory	16 Mbit EEPROM for data storage Stores 340,000 data points.
USB	USB 1.0 Interface

Environmental

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/Regulatory

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

Measurement

Internal Temperature
Sensor	Cantherm MF58104F3950 Beta 4390K
Range	-40°C to +70°C
Resolution	0.1°C
Accuracy	±1°C
Internal Relative Humidity
Sensor	Honeywell HIH-4000-001
Interchangeability	0-59% RH ±5% 60-100% RH ±8%
Resolution	0.5% RH
Accuracy	±5% RH
Hysteresis	3% RH
Repeatability	±0.5% RH
Resistance
Range Resolution Accuracy	10Ω to 100Ω 1Ω ±5%
Range Resolution Accuracy	100Ω to 100KΩ 10Ω ±1%
Range Resolution Accuracy	100KΩ to 1GΩ 1KΩ ±5%
Voltage
Range	0V to 5V
Resolution	100mV
Accuracy	0±5%

Mounting

The SMT-A2's handheld mechanical design is targeted for use in indoor applications. Mounting options are available for outdoor installations.

Installation Guide

New Enclosure option:

A2 Pelican 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.

Connectivity

External Port Connectivity For Restoration A2

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

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)
	0-5V Sensors 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.

Screenshots

Main Menu

The main menu contains links to the submenus as shown below. The header reports the immediate status of the unit.

Network Status

A2 Network Sceen

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.