Correct. Analytics is the online access and graphing site. Data is synchronized with BiG and TiG gateway systems via an Internet connection.

Alarms are water and moisture leaks that require IMMEDIATE attention. The SMT system independently sends text pages and emails as alarms. Additionally, the Building Intelligence Gateway can be connected to the general alarm system, the security system alert.

Events are moisture accumulation that occur in areas that are not critical, nor need immediate action. The moisture that is detected in an event may dry out over time, and will not require special maintenance attention.


Fundamentally, unlimited. We have tested with over 100 dataloggers, 800 sensors. The limitation becomes the processors speed to handle the requests.

Yes. We typically install a Davis Vantage Pro 2 weather station with various configuration software to make it communicable via the internet. Then we integrate data with­in analytics for the internet. The weather data is then available side­-by­-side with your sensor data.

BiG User Manual has step by step instructions. 
Right click my computer -> select manage system tool -> event view -> right click application -> select properties -> select in the log size part "Overwrite as needed" eePC images have this setting defaulted, while older computers or computers that BiG was installed on may not have this. The WiKey will accept data from a WiDAQ if the log is full, however BiG cannot record said data, and thus data will be lost. The data will not be datalogged as the WiDAQ will assume it was succesfully transmitted to BiG and recorded.

System Requirements:

The SMT BiG software can be installed on a computer with the following minimum system requirements:

  1. Install BiG 1.5 for Microsoft Windows XP/Vista
  2. Install BiG 2.X or higher for Microsoft Windows 7/8/10
  3. 512 MB of RAM
  4. 50 MB of free disk space


Network Requirements:

The SMT BiG software can synchronize data with SMT's Building Analytics network interface with the following network requirements:

  1. HTTP Internet Access on Port 80. Servers required to access are and
  2. Accept ICMP Echo Requests (allow ping) to a range of Google servers If it is not possible to modify the ICMP settings deselect "Enable ICMP ping" under Settings General using BiG 2.X or higher.
  3. If email notifications are used, specify the SMTP port used under the Settings -> Mail tab Example: If SSL is used, Port 587 or 465
  4. If RDP is used for remote administration enable port forwarding for port 3389
  5. If VNC is used for remote administration enable port forwarding for port 5900

Note: BiG must be commissioned to an Analytics Project in order for it to synchronize its schema and data. Refer to the BiG User Manual for instructions on how to commission your gateway with Analytics.


The SMT Research WiDAQ can be configured as a wired data acquisition device, or a wireless data acquisition device. Your project requirements drive the configuration and the specific deployment of the WiDAQ. 

The communication distance is dependent on the construction type of the building in which you are monitoring. Within a concrete or steel building, you would only expect to communicate through one slab of concrete, very rarely communicating through two. Our systems are similar to Wi­Fi or 2.4 gHz cordless phones, in which their range is approximately: a sight, through 1 or 2 drywall partition walls, or one concrete slab. We do have methods of range, extending tho which can run via an Ethernet cable. Another solution is to place multiple BiGs in one building.

No. The wireless system is based on 802.15.4 IEEE Network protocols, and is out of range of any licensed or unlicensed bands of transmission.

Yes - but they don’t have to.
The wireless system can be operated using a standard AC/DC wall mount adaptor in lieu of batteries.

The system ideally communicates wirelessly so that no communication cable is required to route data back to a central location. Standard AA battery packs will give 1 to 3 years' life depending on sample rate and the types of sensors used. Rechargable batteries are also available for fast sampling temporary tests. While larger battery packs are available for long term monitoring (5+ years), we also provide solar powered cases for outdoor applications that require a 10+ year power supply life. The selection of power supply is unique to specific projects and their sampling rate, along with which type of sensor(s).

Contact our engineers today to discuss your project details so we can assist to supply your monitoring requirements. Refer to the data logger data sheets for additional information.

Specifications to meet published resolution and accuracy:
Operating: 0°C to 40°C
Storage: -25°C to 70°C

Note: unit has been verified in these ranges and the lowest common denominator of selected components fit this range For operation below -20°C, units should be screened. PMMs measure within 1°C for temperatures up to 80°C.

There are a couple of reasons for discrepancy between the SMT Monitoring Kit and your meter:
  - If surface moisture is present the handheld will read higher as it will be in direct contact with the surface, where as the PMM probes are inside the wood.
  - Probe Insertion Depth - The probes with the SMT kit will penetrate deeper into the wood than the typical hand held meter, this will typically yield a higher moisture content reading. The SMT kit will yield similar results to using a hammer probe and driving probes in to the equivalent depth of those provided with the SMT kit.
  - There can be a significant difference in moisture depending on the wood grain. Samples only 1 inch away from each other could differ by 3% to 5% MC.
  - Wood Type Compensation - The SMT system is defaulted for a wood type of Western White Spruce which makes up the majority of wood used in construction, while your meter is probably set to compensate for Douglas Fir. This is roughly a 2-3% difference between the two wood type settings, with Douglas Fir reading less.
   The SMT system can be configured to compensate for Douglas Fir by changing the Wood Species type through the Simple Sensor Editor interface.

When using 4AA batteries the unit will stop functioning at 3.7V.
It is advised to set your battery low alarm at 4.7V. This should give a few days worth of operation between the unit dies.
When using 9V batteries (Mobile WiDAQs) the battery low alarm should be set at 5V.

The minimum voltage for the A2 is 2.2V.
The minimum voltage for the A3 is 3.0V.

Datalogging Capacity

Select Datalogger:

WiDAQ - 13800 data points

SMT-A2 - 340000 data points

Enter Number of Enabled Inputs:

Enter Sample Frequency: minutes

Data Logging Capacity: days

Typical Number of Inputs:

  • WiDAQ Industrial Unit: 12 inputs
  • WiDAQ Mobile Unit: 8 inputs
  • SMT-A2: 7 inputs (unused ports are automatically disabled)

To conifgure a WiDAQ follow the steps below.
Note: SMT-A2 conifguration does not use this method.

Step 1. Access diagnostic mode of the WiDAQ

Put the WiDAQ into Diagnostics mode.
WiDAQs operating over CAN do not need to be put into diagnostics mode.

Two methods: 

  1. Press the button on the WiDAQ 5 times. Both green and red light should be ON.
  2. Right click on the WiDAQ selection you wish to modify and select "Mailbox Message" and then "Enter Diagnostics Mode". The next time the WiDAQ checks in, it will process this command. It could take up to 5 minutes for the WiDAQ to check in.


Right click on the WiDAQ you wish to configure and select Configure. The WiDAQ must be in diagnostics mode or operating over a CAN bus.


Step 2. Configure WiDAQ


  1. Using this screen inputs can be enabled/disabled.
  2. The channel and PAN can be set.
  3. The channel mask can be defined.
  4. The Timer or reporting frequency can be selected



“Why not just use a Relative Humidity Sensor (Rh) in an assembly to get the amount of moisture?”

Short Answer: The Rh Sensor measures the relative amount of water vapour in the air around the structure, but NOT what is inside of the structural element itself, such as wood, gypsum, or concrete.

Long Answer: SMT is often required to answer questions about the practical end of monitoring for moisture in assemblies using a variety of sensor classes. Humidity, Temperature, and Moisture Content are but a few tools SMT has as its disposal. 

The measurement of Rh is derived from an analysis of the amount of water vapor in the air. This vapor is a gas and is invisible. An increase in relative humidity means that subject to air flow and spatial/thermal dynamics, regional moisture is increasing. As such, when humidity rises, the presence of moisture is likewise increasing and doing so in proximity to the Rh sensor itself.

On the other hand, Moisture Content is a measurement of liquid water in a substrate or on a surface. Water content is generally expressed as a ratio from 8% - 45%.

Typical Rh sensors have an upward limit of nearly 99% relative humidity. This means that once the air reaches saturation, the level in which the air can not absorb any more water, also known as the condensation threshold or dew point. When using an Rh sensor for Building Science purposes, the proper placement and use in assemblies that require careful study must be considered. Moisture Content Sensors such as the the SMT Point Moisture Measurement Sensor (PMM) or SMT Embedded Moisture Sensor (EMS) or the SMT Moisture Detection Sensor Tape (MDS) pick up monitoring beyond the 100% Rh air saturation level, and monitor when Moisture Content or Moisture Level in a substance when there is free water or fibre saturation. 

The Rh sensor when installed for long term monitoring in wet environments may not operate beyond a few months due to such high levels of moisture effecting the electrical sensor. The use of SMT PMM and MDS are required for monitoring structures long term when liquid forms of water are present for the life span of the structure.



Yes. SMT Research System have be installed by many General Contractors, Communication Contractors, AV, IT companies. The sensors, and hardware systems are delivered configured and ready to install into your building. In certain projects, an SMT representative will commission the entire system, and certify that all is in working order piror to sign off.
SMT Research can provide Turn-Key monitoring solutions – from design and specifications though final commissioning and long term monitoring.

Please contact SMT Research with your project details for a free quotation.

Yes. The SMT Research equipment and monitoring system was specifically designed taking into account application to existing buildings. The system can be installed to the outside of a building enclosure wall or roof system while performing routine inspection or maintenance - without interruption to the building occupants.

No. We can detect the conditions that lead to mold growth - the temperature and moisture content levels of your building wall or roof systems.

Moisture Detection is when SMT Research equipment monitors for moisture accumulation in the building enclosure - the walls, roof and foundation of the building, and there is a slow gradual build up of moisture in which over time may cause damage to the building.

Leak Detection is when SMT Research equipment monitors for water  intrusion into a space, which could be the building enclosure and roof & envelope, but also could wider spread from leaks from plumbing fixtures, mechanical equipment.  In most water leak cases the water leak over a very short period of time and the monitoring and reporting occurs in minutes.

Please see the career section on the website for current opportunities at SMT.

WiDAQ Wireless Precision Data Acquisition Node
BiG Building Intelligence Gateway
BiSS Building Intelligence for Sustainable Structures
BiOS Building Intelligence Organizational Software
MC Moisture Content
ML Moisture Level
MDS Moisture Detection Sensor
PMM Point Moisture Measurement
EMS Embedded Moisture Sensor
DMVM Digital Multivector Mapping


Our clients have requested confidentially, and we respect that. Please contact us if you want references from the professionals and owners that we have worked with. We'll ask our clients for permission for you to give them a call - and give you full contact information.