Wisen Innovation Technical Doc. No.2021
WiSenMeshWAN® 4-Channel Vibrating Wire Interface Node - User Manual
WiSenMeshWAN®
4-Channel Vibrating Wire Interface Node
User Manual
6A08
Wuxi Wisen Innovation Co., Ltd.
August 2021
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Wisen Innovation Technical Doc. No.2021
WiSenMeshWAN® 4-Channel Vibrating Wire Interface Node - User Manual
Rev.
V1.0
V1.1
Issue Date
17/11/2020
04/08/2021
Revision History and Clarification
Revisions
1st Issue
Written By
Revised By
Xiaoyan Huang
Dr. Yan Wu
Minor wording changes.
Xinhu Nie
Dr. Yan Wu
Document Definition:
It defines the specifications (i.e., introduction, technical features, deployment and maintenance methods) of the
WiSenMeshWAN® VW interface node, which is one of the key components in WiSenMeshWAN® 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.
Customer Site Project Managers and Engineers, Wisen Service Engineers, etc.
Scope：
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Wisen Innovation Technical Doc. No.2021
WiSenMeshWAN® 4-Channel Vibrating Wire 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 -
5.1．System Deployment Notifications.................................................................................................................. - 8 -
5.2．Choosing your VW Sensors ............................................................................................................................ - 9 -
5.3．Deployment Procedures ................................................................................................................................ - 9 -
5.4．Mounting Options ........................................................................................................................................ - 11 -
6. General Maintenance and Notification ..................................................................................................................... - 11 -
7. Package and Accessories ........................................................................................................................................... - 12 -
8. Safety and Warning ................................................................................................................................................... - 13 -
9. Contact ...................................................................................................................................................................... - 14 -
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Wisen Innovation Technical Doc. No.2021
WiSenMeshWAN® 4-Channel Vibrating Wire Interface Node - User Manual
1. Product Introduction
The WiSenMeshWAN® Vibrating Wire (VW) Interface Node is one of the key products in our
patented WiSenMeshWAN® geotechnical safety monitoring system. Working together with the WiSenMeshWAN®
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 WiSenMeshWAN® VW Interface Node operates using our core technology, i.e., the WiSenMeshWAN® 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. 4-Channel VW Interface Node Overview.
WiSenMeshWAN® 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.
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WiSenMeshWAN® 4-Channel Vibrating Wire Interface Node - User Manual
2. System Structure Layout
Figure 2. System Structure Layout.
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WiSenMeshWAN® 4-Channel Vibrating Wire Interface Node - User Manual
3. Node & Radio Features
Node Features:
Basics
Accuracy Stop Voltage
Mesh Stop Voltage
Battery Connection
Local Storage
L x W x H
Weight
Weight
Cable Gland
Sensor Type
No. of Inputs
Parameter
Range
Accuracy
Sensitivity
Parameter
Range
Accuracy
External Thermistor Sensor
Battery Power
Qty. x 2 (3.6V Lithium primary D-Cell ER34615)
Working Current (DC)
Max. 60mA (Typ. 48mA)
External Sensor Size and
Depending on the specific VW sensor connected
(external cable length ≤ 1.1km)
Qty. 4 x EMC-CMA12 for external VW sensor connection
Wire Connection
Spring type wiring terminal
Externally Connected VW Sensor
2.1VDC
2.1VDC
Standard Aluminium Battery Holder
Min. 450 Messages during Meshing
180 x 140 x 60mm
1.20kg
Vibrating Wire Typed
4 Channel
VW Type of 5 wires: VW+, VW-, T+, T-, GND.
must be connected.
Resonant Frequency (Hz)
400 to 6000Hz
0.015% at Any Reading
0.002Hz@400Hz or 0.05Hz@6000Hz
Thermistor Resistor of 3kΩ @25°C
0.052kΩ to 113.096 kΩ
0.12kΩ or 2°C
Sensor Connection
Note: Temperature wires (or a 3kΩ resistor) must be connected to the T+ & T-
terminals so VW node can work properly; Ground wire between a node and a sensor
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WiSenMeshWAN® 4-Channel Vibrating Wire Interface Node - User Manual
Standard System Parameter
Temperature
Range: -40 to 85°C, Accuracy: +/-1°C, typical 0.5°C; Resolution: 0.1°C
Accuracy: +/-0.1V
WSN Protocol
WiSenMeshWAN® Protocol
Inspection Period
Every 3 Years by Manufacturer (or inspected by arranged methods)
Casing and Painting Materials
Aluminium-Alloy Die Castings 12 (Epoxy Polyester Powder Coating)
FCC 915MHz System
CE 868MHz System
Radio Band
902-928MHz
865-868MHz
Central Frequency (Default)
905/910/915/920/925MHz
865.75/866.25/866.75/867.25MHz
Default Transmit Power
15dBm
14dBm
Voltage
WSN Interface
Re-Calibration Method
Industrial Standard
IP Rating
Operating Temperature
Radio Features:
Transmit Power Range
Receive Sensitivity
Bandwidth
Transmission Speed
No. of Mesh Hop*
Supported
Sampling Interval
Antenna Description
Mesh Antenna
Omni-directional (20cm in length) or Customised
Antenna Connector
Non SMA
* E.g., the radio link from a gateway to the 1st layer node is called the 1st hop.
>= IP66
-40 to 85°C
5-15dBm
-112dBm
500kHz
19.2kb/s
6 Hops
1-60mins
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WiSenMeshWAN® 4-Channel Vibrating Wire Interface Node - User Manual
4. Terminologies
Figure 3. VW Interface Node Internal Configuration Terminologies.
5. Operation Procedures
5.1．System Deployment Notifications
1)
Location: The deployment location of a VW Interface Node is usually determined by the required monitoring or
inspection location;
2) All the Serial Numbers of a Unit must be recorded against their site references;
3) 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;
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Wisen Innovation Technical Doc. No.2021
WiSenMeshWAN® 4-Channel Vibrating Wire Interface Node - User Manual
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 WiSenMeshWAN® system are:
Gateway first, then nearby nodes, then further nodes.
4) During deployment, the Serial Number, i.e., SN of a node and the orientation of the VW sensors deployed against
5)
The connections between a customer chosen VW sensor and a Wisen VW Interface Node must strictly follow the
their site references must be recorded;
rules stated in this document;
6) All the node should have its antenna point upwards.
5.2．Choosing 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.
B.
C.
The braid screen is connected to the box;
The 4 coils are connected to the unit signal terminals;
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).
5.3．Deployment 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,
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WiSenMeshWAN® 4-Channel Vibrating Wire Interface Node - User Manual
please use a handheld readout device to confirm valid readings can be read;
5)
Sensor connections to Node:
Strip the cable sleeve back by 8mm;
A.
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.
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Wisen Innovation Technical Doc. No.2021
WiSenMeshWAN® 4-Channel Vibrating Wire Interface Node - User Manual
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
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, which means the node is on properly. Then switch off the node to save power if the gateway is
Tighten the 4 Cap-Hex-Head screws of the lid to secure the enclosure IP rating;
To validate the sensor data, please visit Wisen Visualisation Platform for further details.
VW Interface Node can be deployed with various methods. However, the priciple is to make sure it is firmly attached to
the noise.
off;
7)
8)
5.4．Mounting Options
the installation surface.
6. General Maintenance and Notification
1) Once a node is installed in the field, please minimise any man-made disturbance so that data quality
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
can be maintained;
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 WiSenMeshWAN® 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:
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WiSenMeshWAN® 4-Channel Vibrating Wire Interface Node - User Manual
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;
the battery.
Notices
:
happy to help.
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
g) Make sure the 5 wires are connected properly, if necessary, please disconnect the wires to inspect.
i. Case One: If any change has been made from the list above, please inspect the data at the remote server;
ii. Case Two: If all the actions from the list above have not cured the problem, please contact Wisen. We will be
7. Package and Accessories
Standard:
2
3
4
5
No.
Items
Dimension (mm)
Qty.
1 WiSenMeshWAN® VW Interface Node
180x140x60
Mesh Antenna
Cap-Hex-Head Screw
200
M6x14
User Manual*
Downloadable from Wisen
Inspection Report*
Visualisation Platform.
1
1
4
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WiSenMeshWAN® 4-Channel Vibrating Wire Interface Node - User Manual
8. Safety and Warning
Warning: Please read the following instructions carefully.
Before taking any action, please read all the information provided carefully, and keep the guidance documents
Ensure that any procedures and installations are correctly carried out. The communication cable and the case
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.
To install the battery into a holder, please follow the “+” (positive) and “-” (negative) signs in any Wisen product.
Wrong orientation of a battery could potential cause unit damage. Notice
: The orientation of battery can vary
When disconnecting the battery, please take special care not to apply excessive force, otherwise the battery
holder and the nearby circuitry may be damaged.
3）Warning
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
1）Operation Safety
safe;
must be grounded.
2）Electric Safety
among products.
to the users.
4）Caution
manufacturer.
disposal.
Danger of explosion if battery is incorrectly replaced. Replace only with the type recommended by the
When disposing of the batteries, please contact your local authorities or dealer and ask for the correct method of
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WiSenMeshWAN® 4-Channel Vibrating Wire Interface Node - User Manual
9. Contact
- Wuxi Wisen Innovation Co., Ltd.: www.wisencn.com
-
Email: support@wisencn.com
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FCC Warning
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.
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
-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.
connected.