Geosense LS-G6-VW User manual

User Guide V1.9
Vibrating Wire Node
5-Channel
(LS-G6-VW)
1-Channel Aluminum
Version
(LS-G6-VW-1M)
0

Table of contents
Before starting to use Vibrating Wire Data logger 2
Overview of the Loadsensing Vibrating Wire Devices 3
Vibrating Wire Logger Specifications 4
Equipment provided 5
Sensor connection 7
Powering the wireless data logger 8
Loadsensing Device Configuration 10
Safely Closing the Vibrating Wire Logger 19
Node Surge Protection 21
Maintenance and troubleshooting 28
Battery Lifespan 29
Data Storage 30
FAQs 32
CONTACT WORLDSENSING 35
1

Before starting to use Vibrating Wire Data logger
Please read these instructions carefully and ensure that the required conditions specified in this
document are met before using the product. Each of our edge devices includes this information
inside the packaging
General warnings
●
Follow these precautions to avoid a battery explosion or leakage of flammable liquid or gas:
○
Use the correct battery type. Dispose of the batteries according to instructions. Do not dispose of the
batteries by throwing them into a fire or a hot oven, or mechanically crush or cut them.
○
Do not leave the batteries in an extremely high-temperature environment.
○
Do not subject the batteries to extremely low air pressure. It may result in an explosion or leakage of
flammable liquid or gas.
○
Do not short circuit the batteries. This will blow the protection fuse.
●
Batteries and equipment to be connected via the data port must meet IEC 62368-1 ES1 and PS1 requirements.
●
Equipment to be installed in restricted access areas.
Symbol
Description
Caution. Do not proceed until the instructions are clearly understood and all required
conditions are met.
Read the instructions for use carefully before using.
Caution, hot surface.
According to the European Union WEEE Directive 2012/19/EU, this product and its batteries
should not be discarded as unsorted waste.
Please send them to separate collection facilities for recovery and recycling.
It is your responsibility to dispose of your waste equipment and batteries properly. The
correct disposal of your old equipment and batteries will help prevent potential negative
consequences for the environment and human health.
2

Overview of the Loadsensing Vibrating Wire Devices
This user guide explains the basic procedure for configuring and operating
Worldsensing’s Loadsensing LS-G6 vibrating wire nodes (LS-G6-VW, LS-G6-VW-1M). You
can find further technical details in our data sheets.
The Loadsensing Vibrating Wire data logger is a low-power, long-range wireless edge
device. Two models are available: a 5-channel vibrating wire node where up to 5
vibrating wire sensors can be connected at the same time, and a single-channel
vibrating wire node for a single sensor.
We oer metallic versions of the single-channel and multichannel nodes.
The Loadsensing Vibrating Wire data logger can also be used as a standalone logger for
manual monitoring. It can be configured easily and connected with a USB cable and an
Android phone.
Loadsensing Vibrating Wire devices are able to read most of the vibrating wire sensors of
the market. These are used for geotechnical applications in civil works, tunnel
construction, landslides and mining.
3

Vibrating Wire Logger Specifications
LS-G6-VW, LS-G6-VW-1M
VIBRATING WIRE
Measurement method: embedded algorithms increasing immunity to noise.
Excitation wave
+/- 5 V
Measurement range
300 - 7000 Hz
Resolution (-40ºC to +85 ºC)
< 0,01 Hz
*
Accuracy (-40ºC to +85 ºC)
Resolution and accuracy depends on the sweep, as follows:
Vibrating wire
sweep range
Excitation
Frequencies (Hz)
Accuracy -
Error (%)
Resolution (Hz)
Sweep A
450 - 1 125
0.013
0.002
Sweep B
800 - 2 000
0.008
0.002
Sweep C
1 400 - 3 500
0.010
0.004
Sweep D
2 300 - 6 000
0.009
0.007
THERMISTOR
Measurement range:
0 ohm to 4 Mohm
Resolution
1 ohm
Accuracy (20 ºC)
0,05ºC (0,04 % FS)
BAROMETER
Pressure range
300 to 1.100 hPa
Relative accuracy (900 to 1050 hPa at 25ºC)
+/- 0,12 hPa
* Since firmware node version 2.43 resolution and accuracy have been improved according to the
sweep frequency group. It is very important to configure the sensor according to its sweep
frequency group, as this will be aecting both parameters.
4

Equipment provided
The Loadsensing nodes are shipped with the following accessories:
●
Vibrating wire data logger.
●
Antenna.
●
Antenna adapter.
The package does not include:
●
A USB-OTG configuration cable.
●
Batteries.
●
A grounding connector.
●
Mounting support .
The vibrating wire logger comprises:
1. Casing.
2. RP N female connector.
3. Male RP N connector to RP - SMA
male and aerial with RP - SMA
male.
4. External mini USB B female
connection
5. Gore valve for protection against
condensation.
6. A grounding screw for metallic
nodes.
7.
Cable gland.
Check the labels in the image on the right to determine the position of each component.
5

Data Logger Mounting
All vibrating wire data loggers can be deployed as follows, depending on the application
and the conditions of the site:
●
On a wall, using a metallic (LS-MEC-MP-001) or polycarbonate (LS-ACC-MP-P)
mounting support.
●
On a 35-mm or 50-mm mounting pole, using an aluminum mounting plate
(LS-ACC-POLE35-2/LS-ACC-POLE50-2). This includes nuts and U-bolts for
a
pole diameter of less than 35 mm and 50 mm.
●
Inside a manhole, with a plastic or metallic cover. No special accessories are
available for this type of mounting. Even though the data loggers are IP67
certified, if they are closed following the instructions in the chapter on Safely
closing the vibrating wire data logger from this User Guide, we strongly
recommend reading the Data Logger Installation in Manholes
guide.
You can find drawings for our supports in the Accessories List in our knowledge base.
6

Sensor connection
Most vibrating wire sensors can be connected to the Loadsensing vibrating wire data
loggers. Further information can be found in the vibrating logger specification chapter.
The data logger has a cable gland for each channel, to allow you to adjust dierent
sensor cable diameters. Each terminal block has a group of five connectors and each
group has:
●
2 vibrating wire connectors (with no polarity) VW
+/ -
●
2 thermistor connectors (with no polarity)
TH +/-
●
1 shield terminal
SHLD
The terminal blocks accept wires prepared by stripping a short length of insulation from
the end.
Wires and their pinouts must be checked with the sensor data sheet from the
manufacturer. As a workaround, pairs can be checked with a multimeter.
After you connect each terminal block, we recommend you take some sensor readings to
make sure the connections have been made correctly. Also, taking several readings will
help you check that the sensor is correctly wired to the logger and the sensor wires.
An alternative can be to compare the sensor reading at installation with a portable
readout unit.
7

Powering the wireless data logger
The Loadsensing vibrating wire nodes are shipped closed, without batteries. To power it
up, follow these steps:
1. Open the vibrating wire node using a 2.5 mm Allen key.
2. A small RTC battery was shipped inside the ½ AA size battery holder in our
multichannel data loggers in order to keep time regar dl ess of whether C-type
batteries are also inserted in the data logger.
Since serial 52594 and above, the ½ AA size battery holder and its battery have
been removed from the battery board to simplify the product installation and
maintenance and in line with our thrust to provide more environmentally
sustainable products by reducing battery waste.
Please take note that this update shall have no impact whatsoever on the
performance of the edge device, as since Gateway firmware version 1.12.1 the
Gateway is able to check if the node is on time. If it's not, a time synchronization
message is sent.
3. The data logger always uses UTC time, although data can be visualized in local
time in our gateway.
8

4. Insert C-type batteries in the battery holders. The single channel node takes only
one battery and the multichannel node has up to four (more batteries will give the
logger a longer life for a given configuration). See our LS G6 data logger
recommended batteries guide for further information.
Please note our devices have reverse battery protection but it is not safe to keep
batteries reversed in the node for a long time.
Warning: There is a risk of explosion if you use the wrong batteries. Dispose of batteries according
to instructions and refer to the General Warnings from bellow.
5. As well as batteries, the logger can be powered with external power. There is a
power mode switch on the node. Turn it to whichever power mode you are using.
Please take a look at the External power options document before using this
option.
General Warnings
● We advise during usage of the batteries to observe the following precautions:
○ Risk of explosion if the battery is replaced with an incorrect type.
○ Disposal of the battery into fire or a hot oven, or mechanically crushing or
cutting of a battery, can result in an explosion.
○ Leaving the battery in an extremely high temperature surrounding
environment can result in an explosion or the leakage of flammable liquid or
gas.
○ The battery subjected to extremely low air pressure that may result in an
explosion or the leakage of flammable liquid or gas.
○ Short-circuiting the battery will result in blowing the protection fuse.
● Batteries and equipment to be connected via the data port must meet the
requirements of ES1 and PS1 according to the IEC 62368-1.
● Equipment to be installed in restricted access areas.
9