Wisen Innovation Technical Doc. No.2019 WISENMESHNET L-Series VW Interface Node - User Manual WISENMESHNET L-Series VW Interface Node User Manual Model Name :6A07 Wuxi Wisen Innovation Co., Ltd. November 2019 www.wisencn.com Page - 1 - of 14 Wisen Innovation Technical Doc. No.2019 WISENMESHNET L-Series VW Interface Node - User Manual Revision History and Clarification Revisions 1st Issue Written By Revised By Xiaoyan Huang Dr. Yan Wu Rev. V1.0 Issue Date 01/11/2019 Document Definition:
It defines the specifications (i.e., introduction, technical features, deployment and maintenance methods) of the WISENMESHNET VW interface node, which is one of the key components in WISENMESHNET Low Power, Intelligent, Wireless Sensor Network (WSN) system. It is responsible to:
Sample data from external Vibrating Wire sensors, such as strain gauge, displacement transducer, piezometer, settlement sensor, pressure cell, load cell, etc.;
Form a time-synchronized Wireless Sensor Network with others nodes in the system;
Transmit the data packet to a gateway. Scope Customer Site Project Managers and Engineers, Wisen Service Engineers, etc. www.wisencn.com Page - 2 - of 14 Wisen Innovation Technical Doc. No.2019 WISENMESHNET L-Series VW Interface Node - User Manual Table of Contents 1. Product Introduction................................................................................................................................................... - 4 -
2. System Structure Layout ............................................................................................................................................. - 5 -
3. Node & Radio Features ............................................................................................................................................... - 6 -
4. Terminologies .............................................................................................................................................................. - 8 -
5. Operation Procedures ................................................................................................................................................. - 8 -
5.1System Deployment Notifications.................................................................................................................. - 8 -
5.2Choosing your VW Sensors ............................................................................................................................ - 9 -
5.3Deployment Procedures ................................................................................................................................ - 9 -
5.4Mounting Options ........................................................................................................................................ - 10 -
6. General Maintenance and Notification ..................................................................................................................... - 11 -
7. Package and Accessories ........................................................................................................................................... - 12 -
8. Safety and Warning ................................................................................................................................................... - 12 -
9. Contact ...................................................................................................................................................................... - 13 -
www.wisencn.com Page - 3 - of 14 Wisen Innovation Technical Doc. No.2019 WISENMESHNET L-Series VW Interface Node - User Manual 1. Product Introduction The WISENMESHNET Vibrating Wire (VW) Interface Node is one of the key products in our patented WISENMESHNET geotechnical safety monitoring system. Working together with the WISENMESHNET gateway product and our customers VW type sensors, it intelligently delivers the real-time VW derived deformation of the structure to the information centre. The WISENMESHNET VW Interface Node operates using our core technology, i.e., the WISENMESHNET Low Power, Intelligent, Wireless Sensor Network protocol, together with its internal high precision frequency sampling module and power unit. This interface node is compatible with conventional geotechnical vibrating wire type sensors measuring in the range from 400 to 6000Hz. This product satisfies the three fundamental identities of the system:
A. Network Life Span: to maximise battery life across the mesh network as a whole;
B. Network Data Arrival Rate: to minimise data packet loss;
C. Single Node Environmental Coverage: to maximise radio coverage. Our product has IP66 and is designed to work in a tough environment. It is small in size, reliable in performance, easy for maintenance, has high precision during sampling, and has strong immunity to radio-interference. Figure 1. 1 Channel VW Interface Node Overview in Photos. WISENMESHNET VW interface node is Compatible with all different brands & types of high quality Vibrating Wire sensors, therefore it can be applied in all different related monitoring projects. Examples of VW sensors: Strain Gauge;
Displacement Transducers; Piezometers; Settlement Sensors; Pressure Cells; Load Cells. www.wisencn.com Page - 4 - of 14 Wisen Innovation Technical Doc. No.2019 WISENMESHNET L-Series VW Interface Node - User Manual 2. System Structure Layout www.wisencn.com Page - 5 - of 14 Figure 2. System Structure Layout. Wisen Innovation Technical Doc. No.2019 WISENMESHNET L-Series VW Interface Node - User Manual 3. Node & Radio Features Node Features:
Basics Battery Power Qty. x 1 (3.6V Lithium primary D-Cell ER34615) Accuracy Stop Voltage Mesh Stop Voltage Battery Connection 2.1VDC 2.1VDC Standard Aluminium Battery Holder Working Current (DC) Max. 60mA (Typ. 48mA) Local Storage L x W x H Weight Min. 450 Messages during Meshing 100 x 100 x 60mm 0.60kg Cable Gland Qty. 1 x EMC-CMA12 for external VW sensor connection Wire Connection Spring type wiring terminal Externally Connected VW Sensor Sensor Type No. of Inputs Sensor Connection Parameter Range Accuracy Sensitivity Cable Length External Thermistor Sensor Parameter Range Accuracy Standard System Parameter Vibrating Wire Typed 1 Channel VW Type of 5 wires: VW+, VW-, T+, T-, GND. Note: Temperature wires (or a 3k resistor) must be connected to the T+ & T-
terminals so VW node can work properly; Ground wire between a node and a sensor must be connected. Resonant Frequency (Hz) 400 to 6000Hz 0.015% at Any Reading 0.002Hz@400Hz or 0.05Hz@6000Hz
<= 1.1km Thermistor Resistor of 3k @25C 0.052k to 113.096 k 0.12k or 2C www.wisencn.com Page - 6 - of 14 Wisen Innovation Technical Doc. No.2019 WISENMESHNET L-Series VW Interface Node - User Manual Temperature Range: -40 to 85C, Accuracy: +/-1C, typical 0.5C; Resolution: 0.1C Voltage WSN Interface Accuracy: +/-0.1V WSN Protocol WISENMESHNET Protocol Re-Calibration Method Inspection Period Every 3 Years by Manufacturer (or inspected by arranged methods) Industrial Standard Casing and Painting Materials Aluminium-Alloy Die Castings 12 (Epoxy Polyester Powder Coating) IP Rating Operating Temperature Radio Features:
FCC 915MHz System Radio Band 902-928MHz Central Frequency (Default) 905/910/915/920/925MHz Default Transmit Power 14dBm Receive Sensitivity Bandwidth Transmission Speed No. of Mesh Hop*
Supported Sampling Interval Antenna Description
>= IP66
-40 to 85C
-112dBm 500kHz 19.2kb/s 6 Hops 1-60mins Mesh Antenna Omni-directional (20cm in length) or Customised Antenna Connector SMA (M)
* E.g., the radio link from a gateway to the 1st layer node is called the 1st hop. www.wisencn.com Page - 7 - of 14 Wisen Innovation Technical Doc. No.2019 WISENMESHNET L-Series VW Interface Node - User Manual 4. Terminologies Figure 3. VW Interface Node Internal Configuration Terminologies. 5. Operation Procedures 5.1System Deployment Notifications 1) Location: The deployment location of a VW Interface Node is usually determined by the required monitoring or inspection location;
2) Before any VW Interface Node is switched on, two tasks will need to be carried out:
A. Unlike the Tilt Node which has a MEMS tilt sensor embedded in the node, the VW sensors chosen by the customer, e.g., VW crackmeter, VW settlement gauge, VW strain gauge, etc, must be connected to the VW Interface Node;
B. A gateway must be deployed, powered on and proven to be working properly. Otherwise, the nodes will need to be switched off, then switched on again after a gateway is switched on. So simply speaking, the rules to follow to correctly deploy a WISENMESHNET system are:
www.wisencn.com Page - 8 - of 14 Wisen Innovation Technical Doc. No.2019 WISENMESHNET L-Series VW Interface Node - User Manual Gateway first, then nearby nodes, then further nodes. 3) During deployment, the Serial Number, i.e., SN of a node and the orientation of the VW sensors deployed against their site references must be recorded;
4) The connections between a customer chosen VW sensor and a Wisen VW Interface Node must strictly follow the rules stated in this document;
5) All the node should have its antenna point upwards. 5.2Choosing your VW Sensors Most problems encountered during monitoring are caused by the cabling and the connections of VW sensors, especially when environment is experiencing strong Electromagnetic (EM) interference, such as power tunnels. The essential requirements when choosing a VW sensor are listed below:
1) The sensor cable: insulation sleeve, braid screen, 4 coils, one drain wire, where:
A. The braid screen is connected to the box;
B. The 4 coils are connected to the unit signal terminals;
C. The 1 drain wire is connected to the electrical circuit ground. 2) Reputable manufacturers.
(Notice
: Wisen can always recommend an updated EMC solution and some suitable manufacturers around the world to our customers. Please contact Wisen for further information). 5.3Deployment Procedures 1) Open the box: Take the node out of the package and open its lid;
2) Insert Battery: By default, a node does not contain a D-Cell battery. Therefore the battery needs to be inserted. Notice
: +ve and ve orientation must be correct, otherwise, the internal circuit may be damaged; As our VW Interface Nodes has more than one battery installed, special attention must be paid to avoid shorting the battery by the battery holder. 3) Antenna Installation: Screw the antenna tightly onto the node;
4) Sensor Installation: To ensure a customer chosen VW sensor is deployed onto a structure correctly, please strictly follow the corresponding manufacturer sensor instructions. Once a VW sensor is deployed and pre-tensioned, please use a handheld readout device to confirm valid readings can be read;
5) Sensor connections to Node:
A. Strip the cable sleeve back by 8mm. www.wisencn.com Page - 9 - of 14 Wisen Innovation Technical Doc. No.2019 WISENMESHNET L-Series VW Interface Node - User Manual B. The 5 wires from the cable are VW+, VW-, Thermistor (Temperature)+, Thermistor (Temperature)- and Ground. Please refer to the sensor datasheet to identify the purpose of the stripped wires. C. Untighten the gland cover, insert cable through the gland, then connect the 5 wires correspondingly as shown in the Figure below. D. Once the wires are connected, please tighten the gland cover firmly to ensure its IP rating on that channel. Figure 4. VW Sensor Connections (VW+, VW-, T+, T-, GND). Notice 1: The cable gland diameter of the 1-VW Interface Node is 8mm. Notice 2: All the 5 wires must be connected, to minimise electrical interference and possible loss of precision. Notice 3: Within any electrically noisy environment, nodes with sensors must be >= 0.3m away from the source of the noise. 6) Power On: Once all the VW sensors are connected, turn the switch on. Now you should be able to see 3 LEDs flashing 3 times, that means the node is on properly. Then switch off the node to save power if the gateway is off;
7) Tighten the 4 Cap-Hex-Head screws of the lid to secure the enclosure IP rating;
8) To validate the sensor data, please visit WISENMESHNET Visualisation Platform for further details. 5.4Mounting Options VW Interface Node can be deployed with various methods. However, the priciple is to make sure it is firmly attached to the installation surface. www.wisencn.com Page - 10 - of 14 Wisen Innovation Technical Doc. No.2019 WISENMESHNET L-Series VW Interface Node - User Manual 6. General Maintenance and Notification 1) Once a node is installed in the field, please minimise any man-made disturbance so that data quality can be maintained;
2) Radio communication will be impaired if the antenna is covered by metal or very moist soil material;
3) Due to the discharge characteristics of the recommended battery, a battery replacement should be carried out when a node reported voltage reaches 2.7V, at which point you have approximately 3 weeks to change the battery;
4) Our product will use all the possible capacity in a battery down to a stop (minimum) voltage, which has been specified in the Features table. When this occurs, our WISENMESHNET protocol will send you a warning then it will enter a deep sleep mode until a new battery is installed;
5) If the data from nodes are showing unexpected results or are not being sent back to the Wisen gateway, then please carry out investigation using the following two stage procedure:
A. Remote Inspection of historical data, to identify the following:
a) Whether the heart-beat message has been sent back successfully at each time interval;
b) Whether the battery voltage is too low, if yes, please change the battery unit;
c) Whether the signal strength has become significantly weaker than it was previously. If yes, please check the antenna has been screwed on firmly. B. On-site Inspection: If all the above are good, please arrange an on-site inspection to check:
a) Whether a Node has visible external damage;
b) Check the box lid to see if it is firmly tightened;
c) Whether the antenna is bent or damaged and that the node is not blocked by new construction, e.g., hoardings;
d) When it is possible, check that the signal strength is normal by using a spectrum analyser;
e) Open the lid, to see whether the battery is firmly attached to its holder;
f) Use a multi-meter to measure the battery voltage. If it is below the stop (minimum) voltage, replace the battery. g) Make sure the 5 wires are connected properly, if necessary, please disconnect the wires to inspect. Notices
:
i. Case One: If any change has been made from the list above, please inspect the data at the remote server;
www.wisencn.com Page - 11 - of 14 Wisen Innovation Technical Doc. No.2019 WISENMESHNET L-Series VW Interface Node - User Manual ii. Case Two: If all the actions from the list above have not cured the problem, please contact Wisen. We will be happy to help. 7. Package and Accessories Standard:
No. Items Dimension (mm) Qty. 1 WISENMESHNET VW Interface Node 100x100x60 Mesh Antenna Cap-Hex-Head Screw 200 M6x14 1 1 4 User Manual*
Downloadable from WISENMESHNET Inspection Report*
Visualisation Platform. 2 3 4 5 8. Safety and Warning Warning: Please read the following instructions carefully. 1Operation Safety Before taking any action, please read all the information provided carefully, and keep the guidance documents safe;
Ensure that any procedures and installations are correctly carried out. The communication cable and the case must be grounded. This product has been designed to meet a certain water-proof level. However, it becomes water vulnerable when the lid is open or if the cable gland has not been sealed properly. 2Electric Safety To install the battery into a holder, please follow the + (positive) and - (negative) signs in any Wisen product. www.wisencn.com Page - 12 - of 14 Wisen Innovation Technical Doc. No.2019 WISENMESHNET L-Series VW Interface Node - User Manual Wrong orientation of a battery could potential cause unit damage. Notice
: The orientation of battery can vary among products. When disconnecting the battery, please take special care not to apply excessive force, otherwise the battery holder and the nearby circuitry may be damaged. 3Warning The battery in the product has a relatively high capacity, so please take special care during storage and usage. This product must not be disassembled under any circumstances, to do so will void the warranty and may leave the product in a dangerous state;
If all the above are not followed, the manufacturer cannot be held responsible for any damage and injury caused to the users. 4Caution Danger of explosion if battery is incorrectly replaced. Replace only with the type recommended by the manufacturer. When disposing of the batteries, please contact your local authorities or dealer and ask for the correct method of disposal. 9. Contact
- Wuxi Wisen Innovation Co., Ltd.: www.wisencn.com
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Email: marketing@wisencn.com www.wisencn.com Page - 13 - of 14 Wisen Innovation Technical Doc. No.2019 WISENMESHNET L-Series VW Interface Node - User Manual FCC Warning
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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. Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
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- Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
-Reorient or relocate the receiving antenna.
-Increase the separation between the equipment and receiver.
-Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
-Consult the dealer or an experienced radio/TV technician for help. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.
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