LORD QUICK START GUIDE SHM-Link-201 Ruggedized Wireless Structural Health Monitoring Node NODEOVERVIEW The SHM- Link- 201 structural health monitoring node is used for in- situ, multidimensional measurement and analysis of component strain and fatigue. The SHM-Link-201 has three input channels and is designed to integrate with field-installed strain gauge rosettes. The SHM-Link-201 embedded processing algorithms provide sophisticated data outputs, including damage estimations using user-configurable strain number curves, estimations along various user-configurable angles, and an ASTM e1049 rainflow- counting histogram output. Sampling modes include continuous and activity-sense. The SHM-Link-201 is designed for extended use with a lithium battery. To acquire sensor data, the SHM-Link-201 is used with any LORD Sensing data gateway, such as the WSDA -Base -10x-LXRS, or the network-ready WSDA -
1500 - LXRS . The SensorConnect software interface is used for node configuration, and SensorCloud is available for advanced data visualization, aggregation, and analysis. Users can also build custom software interfaces with the MicroStrain Communications Library (MSCL). Figure 1 - Wireless Sensor Node WirelessSimplicity,HardwiredReliability Figure 2 - Node Components Item A B C D E F Description SHM-Link-201node assembly Battery compartment cap Battery compartment o-ring Battery tray Strain gauge bonding cable Dielectric grease (not shown) Table 1 - Component List Quantity 1 1 1 1 1 1 Wireless Sensor Node Quick Start Guide The SHM- Link- 201 compartment and accommodations for strain gauges and node installation. A device status indicator is visible through a light-pipe below the product label. interfaces includes battery a Indicator Behavior Device status indicator OFF Rapid multi-color flash on start-up Slow pulse ~ once/2 sec Quick blink ~ once/sec Quick blink ~ once/10 sec Node Status Node is OFF Node is booting up Node is idle and waiting for a command Node is sampling Node is in sleep mode Table 1 - Indicator Behaviors NODEDEPLOYMENT The SHM-Link-201 is designed for use with the provided bonding cable. The cable connects the node and strain gauges in a way that allows the gauges to fit underneath the node in the strain gauge cavity, protected from damage. The strain gauge cavity can also be sealed after installation. The following procedure outlines this process. These steps may not be necessary for all applications but provide the best protection for the node circuitry and the gauges. Install the Node Battery The SHM-Link-201 operates on an internal AA-type battery with a voltage between 1 V dc and 5 V dc. Use only batteries that meet this specification. Do not short circuit, crush, puncture, or otherwise misuse the battery. Disposal is subject to federal and local laws. 2 Wireless Sensor Node Quick Start Guide 1. Remove the SHM-Link-201 battery compartment cap. 2. Position a pliers or a hook-ended tool behind the battery tray screw-head. Pull firmly outward, or leverage the edge of the housing, to release the tray from the terminals inside. It should unseat and slide out. Test Fit Node and Gauge Assembly 7. Determine the location of the component to be monitored where the strain gauges will be installed. 8. Place the bonding cable and node in the chosen location to verify gauge placement and that there is space for the node to fit over the top of them. The gauges are installed in the cable cutout, and the node strain gauge cavity fits over the gauges and cable. Figure 3 - Battery Compartment Assembly Figure 4 - Gauge and Node Location 3. Apply dielectric grease to the battery tray terminals. 4. Install the battery. 5. Firmly re-seat the battery tray in the battery compartment 6. Install the compartment cap, ensuring the o-ring remains intact and prop-
erly seated. Install Strain Gauges NOTE For accurate fatigue data, strain gauge installation must be completed in compliance with strain gauge manufacturer recommendations and industry standard processes such as ASTME1237-93,StandardGuide for Installing Bonded Resistance Strain Gauges. Failure to properly attach and connect the gauges will result in erroneous data. 3 Wireless Sensor Node Quick Start Guide 9. Wire the strain gauges to the bonding cable so that the strain gauge assembly will be positioned in the central cutout . 10. Bond the cable and strain gauges onto the surface of the component to be monitored with strain gauge adhesive or equivalent. Install the gauges in the desired orientation for measurement and in accordance with the strain gauge manufacturers installation instructions. 13. Test the strain gauage installation and basic node functioning by per-
forming an auto-calibration in SensorConnect (See Calibrate the Node on page 7). Figure 6 - Connecting to the Node Install and Seal the Node 14. Remove the node battery or put it in sleep mode (to conserve battery life). Verify the node power switch is in the ON position. Once the node is sealed, the access door will no longer open. 15. Close the node interface access door and remove the installation tape backing from the bottom of the node. Adhere the node in place over the gauges. 16. Apply a high-strength adhesive sealant (such as Sikaflex 255 FC or equi-
valent) around the perimeter of the node where it meets the component surface. 17. Remove the set screws from the sealant injection hole, and fill the strain gauge cavity with a flexible, injectable sealant (such as Self-Levling Green, or equivalent). Avoid over-filling the sealant and allowing it to leak into other cavities (such as the battery compartment and under the access door). This is more likely to happen if the node is mounted vertically. Figure 5 - Strain Gauge Wiring Connect Node to Strain Gauges and Test 11. Connect the node to the strain gauge assembly. Attach the bonding cable to one of the node connectors in the orientation shown. Two are provided for node positioning convenience and have identical pins. The cable should lay flat against the bottom of the node circuit board and wrap up the edge of it to plug into the connecter. 12. Place the node over the strain gauge assembly and verify the strain gauge cavity covers the strain gauge assembly without damaging it. 4 Wireless Sensor Node Quick Start Guide Make System Connections To acquire sensor data, the SHM-Link-201 is used with a LORD Sensing data gateway such as the WSDA-200-USB or WSDA -1500 - LXRS. Connect the gateway to the computer or network and to a power source as required. Refer to the gateway user manual for more information. Node Operational Modes Figure 7 - System Connections 5 Figure 8 - Node Operational Modes Wireless Sensor Node Quick Start Guide Synchronized Sampling Use the Base Station menu to start sampling for multiple nodes in Synchronized Sampling mode. For single nodes, or non- synchronized sampling, the node menu can be used. Figure 9 - Base Station Menu Software Installation and Navigation SensorConnect can be installed on any Windows operating system (Vista or newer). The installer is downloaded from the LORD Sensing website and is also provided with many products. There are three main pages: Home, Devices, and Data, which are always accessible at the top of page. A quick-link to the SensorCloud platform log-in and a software settings menu is also available here. On start-up the software scans for attached sensors and then opens the home page. Figure 10 - SensorConnect Home Page SensorConnect automatically detects any LORD Sensing device plugged into an active port. Device connections are managed on the Devices page. The menu options will vary between devices (such as gateways, nodes, and sensors) but have similar interfaces. 6 Figure 11 - Devices Page Wireless Sensor Node Quick Start Guide Devices list - Found devices appear in the device list. This list also includes previously found devices even when the software is restarted. Selected device and device menu - Each type of device has its own menu. Once selected, the device name is highlighted, and the corresponding menu displayed. Menu options vary between devices but typically include device configuration, start sampling, sensor mode selections, and data downloading. Click on the device name (in the devices list) to get back to the main device menu. Add Device - Manually add a device if it does not appear automatically. Notifications and indicators - information specific to a device, or in response to a requested action, appears next to the applicable device name in the device list, or in the device menu. These notifications provide information about device performance, such as communication and sampling status. Green typically indicates confirmed actions, while orange indicates information that may require further action. Blue indicates they are currently sampling. Configure the Node Power settings, some sampling settings, data output options, and gauge settings specific to the SHM-Link-201 are adjustable through the Configure menu. All other settings are adjusted when sampling is started. Click Apply to save changed settings. Hardware - Set the strain gauge provided by the gauge manufacturer. Fatigue - Select from data output options that produce fatigue measurements. Histogram - Set the rainflow-counting bin thresholds and data transmit rate. Data will still be collected at the rate set in the Start Sampling menu. Activity Sense - Activity sense mode is power-saving mode. When enabled, sampling will only occur when movement is detected by the internal accelerometer. Sampling will occur at the rate set in the Start Sampling menu until the (also configurable) inactivity period has passed. Power - Set the node transmit power, radio-check interval (when the node goes into sleep mode), and the inactivity timeout. Calibrate the Node Calibration of the SHM-Link-201 is done through an internal circuit. With the strain gauges connected, simply open the Auto-Calibrate menu, and select the Calibrate button. This will calibrate all three channels automatically. If the gauges are connected correctly, and the calibration is completed, "Success" will be indicated in the status column. Otherwise it will indicate the sensor is detached. Figure 12 - Configure Menu Figure 13 - Calibration Menu 7 Wireless Sensor Node Quick Start Guide IMPORTANT:Auto- calibration must be performed anytime sampling settings are changed. Start Sampling Data sampling is initiated for each device through its device menu. For a wireless sensor network, sampling can also be started for the entire network by initiating sampling from the network gateway menu. The sampling menu options vary depending on the type of device. Create Data Views Collected data is viewed on the Data page through the creation of dashboards and widgets. Think of dashboards as individual pages and widgets as an illustration on the page. Create multiple data widgets on each dashboard to display sampled data as a time-series graph, text chart, or a simple gauge that only displays the most current reading. This format provides an easy way to organize many sensors and networks, and it allows the information to be displayed in the most appropriate layout. Figure 14 - Sampling Menu Sampling menu - The sampling menu typically includes options for sampling mode, sample rate, and sample duration. Apply the settings to begin collecting data. Sampling indicator - The sampling indicator shows when data is being collected from the device. At slow sampling rates it will turn on and off as readings are taken, while at fast sampling rates it will be on continuously. Figure 15 - Data Page Use the mouse along with the shift and control keys inside the graph window to adjust the data view. Control Mouse wheel Shift + mouse wheel Mouse double-click Shift + mouse left-click and drag left/right Shift + mouse left-click and drag up/down Ctrl +mouse left-click and drag Action Zoom in/out on x-axis Zoom in/out on y-axis Zoom to extends Zoom window left/right Zoom window up/down Zoom box Table 2 - Graph View Controls 8 Wireless Sensor Node Quick Start Guide The widget configuration menu is different for each type of widget but typically includes sensor or channel selections and widget settings such as titles and legends. The SensorCloud interface has six main views . When logging in as a registered user, the Device view is the default. Navigate to other views by clicking the view name at the top of the page. The Data and Settings views are only available once a device is selected from the device list. Figure 16 - Widget Configuration Menu Connect to SensorCloud For global data aggregation, visualization, and analysis, data can be uploaded to the SensorCloud web platform. Basic SensorCloud services are available to all users free of charge. Go to the SensorCloud website and select sign-in to enter the log-in credentials, or register as a new user if needed. http://sensorcloud.com/log-in/
Figure 18 - SensorCloud Menu Views Device - The device list shows every Ethernet gateway and API device associated with the SensorCloud account, including owned, shared, and demo devices. This view provides links to each devices SensorCloud subscription plan, configuration options, and a summary of last communications and data transactions. Account - The account view is for logistic management of the SensorCloud account, such as changing the log- in password, accessing user email, and reviewing billing information. CSVUploader - The data upload feature enables data from any source (such as non-Ethernet LORD Sensing gateways or third-party sensor) to be uploaded to the SensorCloud platform. The data must be in the LORD Sensing .CSV format. Figure 17 - SensorCloud Log-in or Register 9 Wireless Sensor Node Quick Start Guide Figure 19 - MathEngine View Figure 20 - FFT Graph in SensorCloud For more information about SensorCloud features and navigation, refer to the SensorCloud website or contact LORD Sensing Technical Support. http://sensorcloud.com 10 Wireless Sensor Node Quick Start Guide Radio Specifications The SHM-Link-201 employs a 2.4GHz IEEE 802.15.4-compliant radio transceiver for wireless communication. The radio is a direct-sequence spread spectrum radio and can be configured to operate on 16 separate frequencies ranging from 2.405 GHz to 2.480 GHz. Following the 802.15.4 standard, these frequencies are aliased as channels 11 through 26. For all newly manufactured nodes, the default setting is 2.425 GHz (channel 15). FCC ID: XJQMSLINK0008 IC ID: 8505A-MSLINK0008 This device complies with Part 15 of the United States FCC Rules, and Industry Canadas license- exempt RSSs. Operation is subject to the following two conditions: 1) This device may not cause interference, and 2) This device must accept any interference, including interference that may cause undesired operation of the device. Changes or modifications, including antenna changes not expressly approved by LORD Corporation could void the users authority to operate the equipment. Figure 21 - SHM-Link-201 Identification Labels Cet appareil est conforme la Partie 15 des Rgles de la FCC des tats- Unis et aux RSSS exempts de licence d'Industrie Canada. Le fonctionnement est soumis aux deux conditions suivantes: 1) Cet appareil ne doit pas causer d'interfrences et 2) Cet appareil doit accepter toute interfrence, y compris les interfrences pouvant entraner un fonctionnement indsirable de l'appareil. Les changements ou modifications, changements d'antenne non expressment approuvs par LORD Corporation, pourraient annuler l'autorisation de l'utilisateur d'utiliser l'quipement. compris les y LORDCorporation MicroStrain Sensing Systems 459 Hurricane Lane , Suite 102 Williston, VT 05495 USA ph: 802-862-6629 sensing_sales@LORD.com sensing_support@LORD.com Copyright 2016 LORD Corporation Document 8501-0091 Revision A. Subject to change without notice. www.microstrain.com