GTecLink Dataloggers€¦ · gateway or the Android configuration app. RTC battery is only...

GTecLink Dataloggers

Manual

3 About this document

1. Datalogger Installation 4

4

5

8

1.1 Equipment

1.2 Powering the data logger 1.3

Safely closing the data logger 1.4

Data logger mounting 10

2. Datalogger Configuration 11

12

13

14

2.1 STEP 1: Connect GTecLink Android application 2.2

STEP 2: GTecLink main menu

2.4 STEP 3: Sensor configuration

14

15

15

Vibrating Wire Nodes (526160xx)

GeoFlex Nodes (5780170x)

Analog Node (57804800)

16

16

18

2.5 STEP 4: Sensors Data

2.6 STEP 5: Radio configuration

2.7 STEP 6: Radio signal coverage test 2.8

STEP 7: Test results interpretation 20

3 GTecLink Dataloggers 21

3.1 Vibrating Wire Loggers 21

21

22

22

23

3.1.1 Sensor connection

3.1.2 Barometric measurements

3.1.3 Battery lifespan

3.1.4 Configuration

3.1.5 Data storage 23

3.2 GeoFlex Loggers 24

1

GTecLink Datalogger Manual

24 3.2.1 Sensor Connection

3.2.2 Battery lifespan 26

26

26

a) Geosense / RST IPI

b) Sisgeo IPI

c) MDT Multi-Point-Borehole-Extensometers (MPBX) 27

27

28

3.2.3 Configuration

3.2.4 Data storage

3.3 Analog Logger 29

29

31

34

3.3.1 Sensor Connection

3.3.2 Battery lifespan 3.3.3

Configuration 3.3.4 Data

storage 34

35 4. DATA ACQUISITION

5. CONTACT DGSI 36

2


About this document

This user guide explains the basic procedures for data acquisition with the GTecLink family of dataloggers

by DGSI and powered by Loadsensing. Further technical description is available in the datasheets.

The family of GTecLink data loggers by DGSI consists of six different dataloggers that may be used as

standalone data loggers (without remote communication) or radio dataloggers (with remote communication

through a gateway). Please note that we will use the terms datalogger and node interchangeable within this

manual. The models available are:

Data loggers

● 52616001 - One Channel VW Datalogger, Polycarbonate

● 52616011 - One Channel VW Datalogger, Aluminum

● 52616015 - Five Channel VW Datalogger, Aluminum

● 57801700 - GeoFlex Datalogger & Enclosed Power Supply

● 57801705 - GeoFlex Datalogger

● 57804800 - Four Channel Analog Datalogger

3


1. DATA LOGGER INSTALLATION

1.1 Equipment

GTecLink dataloggers are shipped with the following accessories:

- Datalogger

- Antenna

- Antenna adapter

- RTC battery (if applicable)

Not included:

- USB-OTG configuration cable

- Batteries

- Sensor surge protection

- Grounding protection

- Mounting supports (if needed)

4


1.2 Powering the data logger

The data logger arrives closed and without batteries installed. In order to initialize it, the user should

follow these steps:

a. Open the datalogger (using a 2.5 mm Allen wrench) following the recommended positions

(Figure 1) in order to avoid damaging the lateral gore valve. The batteries are inserted into the

cover, so be careful not to snap the cable between the cover and the main board.

Figure 1: View of the recommended positions to open the datalogger

b. Insert the RTC battery (small battery included). First remove the upper enclosure of the battery holder (Figure2). Polarity is indicated inside the holder.

Figure 2: Removal of the upper enclosure of the battery holder

5


The RTC battery keeps time in the data logger regardless of whether or not C-type batteries are also

inserted. The data logger always uses UTC time. However, the data can be visualized in local time in the

gateway or the Android configuration app. RTC battery is only available for multichannel dataloggers.

c. Insert C-type batteries in the battery holders. Between one and four batteries can be connected.Polarity is indicated (see Annex 4 for further information on the batteries).

Note : The device has reverse battery protection but it is not safe to keep batteries reversed in the datalogger for a long time.

WARNING: RISK OF EXPLOSION IF INCORRECT BATTERIES ARE USED. DISPOSE OF BATTERIES

ACCORDING TO THE INSTRUCTIONS. THIS EQUIPMENT SHOULD BE INSTALLED IN

RESTRICTED ACCESS AREAS.

d. Check that power switch (SW A, Figure 3) is in the correct position.

USB: the datalogger is powered by the USB cable connected to any Android device

BATT (default): the datalogger is powered by the batteries.

Note : Some Android devices cannot power the datalogger, especially when performing a reading. If

reading fails, set the switch to BATT mode in order to power the datalogger with batteries.

Figure 3: Detail of power switch (SW A)

6


1.3 Sensor connection

Sensors are connected to the datalogger at the terminal blocks. Each terminal block corresponds to one

channel of the data logger. The terminal blocks accept wires that are prepared by stripping a short length of

insulation from the end.

Each data logger type has specific instructions for sensor wiring. Specifications for each model can be

found in sections: 3.1. (vibrating wire dataloggers), 3.2. (digital dataloggers) and 3.3. (analog

datalogger).

7


1.3 Safely closing the datalogger

This is a very important step to ensure watertightness and durability of the logger. Close the cover by

cross-screwing to the indicated torque 2.5 N.m.

The GTecLink family of data loggers by DGSI have undergone watertightness testing by an external

laboratory and is rated IPX7 (1 meter for 30 minutes) and IPX8 for extended immersion (1 meter for 7 days).

To guarantee watertightness, you must be sure that:

● The box is closed in a cross-shaped order after sensor connection. All the screws must first be

inserted and screwed in until they are connected to the box and then adjusted using the torque

wrench. If these steps are not followed, the base faces and cover may be not be parallel, screwing

may become more difficult and the screw threads or the Helicoil inserts may be damaged.

Moreover, the toric joint (seal) may not be properly sealed and the degree of protection against

water intrusion (IP) could not be guaranteed.

● The box is screwed at 2 N.m (for single channel dataloggers) or 2.5 N.m (for multiple

channel dataloggers) using a torque screwdriver (e.g. Ref. 1227107 from WERA).

8


1

2

3

4

● The cable glands are closed with a 19 mm open spanner (e.g. Bahco 19 mm Single Ended Open

Spanner; RS Amidata code 717-8992) and the internal nut is held with a 22 mm open spanner (e.g.

Bahco 22 mm Single Ended Open Spanner; RS Amidata code 717-8995).

● A piece of rubber rod to seal the unused cable glands is provided in each box.

● The antenna is mounted. If it is not, the antenna connector should be covered with a cap.

● The sealing ring has not been manipulated either physically or chemically.

● The sealing cap USB connector is coiled.

If any of these conditions are not met, or if one or several components (e.g. gore valve) are damaged,

IPX7 and IPX8 ratings cannot be guaranteed.

Should the datalogger need further sealing due to placement in an extreme environment or in a floodable

manhole, additional sealants will be required to close the box (e.g. Sikaflex products).

Note: Box screws shouldn’t be torqued more than 2.5 N.m, even though they can support a maximum torque of

3.5 N.m. If the torque is exceeded, the Helicoil insert may be damaged. We do not recommend using electric

drills or electric screwdrivers.

9


1.4 Datalogger mounting

Dataloggers can be mounted:

● On a wall: mounting brackets are available as additional accessories.

● On a metallic structure: strong magnets are available as additional accessories.

● On a pole: plates for 35 and 50 mm pole diameters are available as additional accessories for this

mounting type.

● Inside a manhole (with a plastic or metallic cover): no special accessories are available for this mounting

type. Even though the dataloggers are IP67 certified, we recommend installing them in holes with

proper drainage so that they won’t be permanently covered with

All GTecLink dataloggers are protected against lightning and there is an easy-to-use

grounding screw (Figure 4) next to the cable glands, which may be connected to provide

protection.

Figure 4: Detail of the grounding screw

Note : In order to protect the datalogger from surges (especially in installations with long cable runs) the

datalogger must be properly grounded via connection to the grounding screw.

10


2. DATALOGGER CONFIGURATION

Ideally, this step of the process should be carried out in the same location where the node is going to be

installed. This way, you can perform an on-site radio coverage test.

The node configuration process is done using the GTecLink app, which is compatible with any Android

device equipped with OTG technology (OS Android HoneyComb 3.1 or higher required). DGSI has

tested Samsung Tab A tablets and Samsung Galaxy 8 phones and ensures that they are able to configure and

test all nodes. (Battery usage may be required as Android devices may not be able to power some sensors.)

The GTecLink app starts up once the device has been connected to the datalogger using the USB-OTG

cable. Manual startup is not necessary.

When a new version of the app is available, the app will display an automatic message.

The whole configuration process does not take more than five minutes and, from that moment, the node

will start taking readings and sending data to the gateway.

11


2.1 STEP 1: Connect GTecLink Android application

Download the app onto your Android device from the DGSI website:

https://durhamgeo.com/downloads/android/gteclink.apk

Connect your device to the node using the USB-OTG cable (Accessories list). Make sure the node is

powered on (BATT mode). The app will automatically appear and display the node’s basic information.

12


http://wsop.cat/industrial/dlog/Dlog.apk

2.2 STEP 2: GTecLink main menu

1) Node info: Basic information about the node (version, ID, temperature, etc.).

2) Sensors data: Access to real time sensor readings and downloaded data stored in the node.

3) Node Configuration: Access this menu to configure the node.

a) Change node ID: Optional. Change node ID and use a different number.

b) Set date and time.

c) Setup wizard: sensor and radio configuration

4) Factory Reset: This option resets the configuration parameters and removes all stored data. This

feature is designed to allow the node to be used in different sites. We do not recommend using it

for other purposes unless suggested by DGSI Technical Support.

To access node configuration, go to “Node configuration” from the main menu and then “Setup Wizard”.

13


2.4 STEP 3: Sensor configuration

Sampling rate

Choose the desired reading frequency from the drop-down menu. The highest possible sampling rate is

limited by the network size and vice versa. Smaller networks can read up to every 30 seconds and

frequency is progressively reduced on bigger networks. The app will show the available sampling rates

according to the network size chosen in the previous step.

For more information regarding network size limitations, see the Tables, Number of nodes, Sampling

rate and Slot time chapters in the Gateway User Guide.

Each type of GTecLink datalogger has its own sensor configuration parameters. For more information

about the configuration of each sensor, go to the corresponding datalogger section.

Once the nodes are connected, we strongly recommend setting the sampling rate again from the gateway in

order to optimize the radio configuration of the network.

Vibrating wire nodes

Only activate the channels that are going to be connected to a sensor and choose the sweep frequency

expected for each sensor (according to the sensor data-sheet).

14


GeoFlex Nodes

Choose the GeoFlex communication protocol among the options available. Select Auto Setup. The

resulting reading file will create a column for each address.

Analog Node

This data logger is compatible with seven types of analog sensors: voltage, Full Wheatstone Bridge,

Thermistor, Current loop, potentiometer, DGSI In-Place Inclinometers and PT100.

Choose an interface for each channel and a wiring diagram assistant will show up. Choose the specific

parameters required for each sensor type, such as the Warm up time and Output power supply. Please

note that if DGSI HD IPIs are being read, they must be placed in Channel 1 and the other channels are no

longer available.

15


2.5 STEP 4: Sensors Data

The “Sensors data” screen displays the current readings of sensors

connected to the datalogger. Here, you can verify that the sensor is

connected correctly by checking if the reading is consistent.

The node takes a new reading every time the refresh button is pressed.

Bear in mind that taking a reading might take some time,

particularly when reading RS485 chains of digital sensors.

2.6 STEP 5: Radio configuration

In this step, you select the radio settings.

Enable “Radio” and select the correct region of radio frequency.

For successful communication, the same region must be applied in the

gateway radio configuration.

Enter the network ID and password provided in the Gateway

Information Sheet . All messages are encrypted with the network

password.

Advanced Options: Default configuration parameters should be suitable

for the majority of networks.

See the Radio specification chapter of the Gateway User Guide or

Annex 01: GTecLink Gateway Radio Specifications v1.8 for more

details on radio models and settings.

Bear in mind that the GTecLink app saves and maintains Radio settings

to simplify configuration of all the nodes in a network. To modify these settings, Radio must be enabled

again.

16


The network size is the number of nodes (data loggers and GTecLink wireless sensors). We strongly

recommend initially setting it to the final number of nodes that the wireless network will have since this

parameter determines the available sampling rates. Bigger networks do not allow selection of small

sampling rates.

Correct configuration of these two parameters (network size and sensor sampling rate) is crucial to prevent

data transmission collisions, which translates to data loss on the gateway.

For more information, please check the Radio specification chapter in the Gateway User Guide.

17


2.7 STEP 6: Radio signal coverage test

This is the final step in node configuration. The app performs

a signal coverage test to check the quality of

communication with the gateway. The gateway must have been

previously connected and configured.

This test will check for correct connectivity between the datalogger

and the gateway. The datalogger will send some test packages.

The Android app will then check on the gateway (using the

Internet connection) for the reception of these packets. Hence,

the test will check for:

● Correct gateway operation and communication.

● Correct radio configuration of both the gateway and

data logger (including matching region and ID/

password configurations).

● Quality of the signal received by the gateway from the

data logger.

By clicking the “Next” button, GTecLink will run an Online test. For the results of this test to be

immediately displayed on the Android device, the gateway and the Android device must also be connected

to the Internet.

In order to perform an online test, the gateway serial number and remote access password must be

provided to the app. The remote access password is used to protect the gateway from

access via the local network or the Internet. It can be different than the radio network password even though it’s set to the same value by default (credentials at Gateway Information Sheet ).

When doing the Radio signal coverage test, the position of the Android device is saved

(if you gave the app permission to access the GPS data) and a security token number identifies each

test. If the gateway and/or the Android device are not connected to the Internet during the test, the

online test will fail and you will need to perform an “Offline test”. In this mode, however, the results of the

test cannot be displayed on the Android device. The security token number identifies each test. Write

down the token

number along with a description of where and under what conditions the test was taken. Check the results

of the coverage test on the gateway web interface (under Network→Signal coverage test map → Download

all tests of this network).

18


If the Android does not have an active Internet connection, then the test must be run offline. Click on “Offline

test”. A CSV file with the test results can be downloaded from the gateway web interface.

Radio signal coverage performed at the end of the datalogger setup (using the Setup wizard).

19


2.8 STEP 7: Test results interpretation

The results displayed are listed for each Spreading Factor (SF). The SF represents a way of modulating

data. The lower the SF number is, the shorter the message; thus, more messages can be sent on the network.

The SF is proportional to the distance between the data logger and gateway: higher SFs are capable of

transmitting data at higher distances, while lower SFs reach lower distances.

During the radio signal coverage test, the datalogger sends five or 10 data packages at SF7 to SF12. The

number of data packages that reach the gateway can be viewed in the results in order to ensure correct

communication.

A coverage test is considered correct if any of the SFs available on the network are able to deliver at least half

of the packages sent.

Note : Performing the Radio signal coverage test takes approximately 2 minutes.

Note : Radio Australia 500MHz works differently. See the wireless radio section in the Gateway User Guide.

20


3 GTecLink DATALOGGERS

3.1 Vibrating Wire Dataloggers

3.1.1 Sensor connection

Most vibrating wire sensors can be interfaced to the GTecLink VW Dataloggers.

The datalogger is supplied with cable glands (one for each channel) to adjust different cable diameters.

After each terminal block is connected, we recommend taking a sensor reading in order to ensure that the connections have been carried out correctly. This reading should be compared with the sensor reading at installation with a portable readout unit before connecting to the GTecLink datalogger. Note that some configuration is required during installation.

Cables must be connected in accordance with the following table:

Each terminal block has a group of five connectors.

Each group has:

● 1x Vibrating wire channel

● 1x Thermistor channel

● 1 Shield terminal

An example of terminal block connections (Table 1 and Figure 46) can be found below.

Name Function

SHLD Used to connect the sensor shield if

needed.

TH2- Thermistor input 2. No polarity.

TH2+ Thermistor input 2. No polarity.

VW2- Differential voltage input 2.

VW2+ Differential voltage input 2.

Table 1: Connections of the terminal block Figure 46: Detail of a terminal block

21


3.1.2 Barometric measurements

The data logger includes a barometer (BOSCH BMP180 device). It is important to avoid placing the data

logger inside any type of container. This would affect correct readings by the barometer through the gore

valve.

If the Vibrating Wire sensor requires barometric pressure compensation (such as piezometers installed in

locations that may be affected by changes in barometric pressure), the current pressure readings from

the barometer are usually used directly. The transformed data (compensated by the barometric

pressure) is displayed if you select the option “Polynomial A with compensation” in the Engineering Units

drop-down menu (see section 2.6).

Should you wish to use atmospheric pressure at sea level as a measurement (commonly used in

meteorology), the barometric readings must be corrected.

The formula for correcting barometric readings in order to provide atmospheric pressure at the sea level is:

p0 =p

(1− )44330altitude 5.255

p0= pressure at sea level in mbars

p= current pressure reading

altitude= altitude in m.a.s.l.


The following table provides the battery lifespan indicated per channel (Table 2). Bear in mind that

consumption varies depending on the sensor used, sampling rate and environmental conditions.

Number of

sensors

Sampling rate (considering SF 9 14dB) Sampling rate (considering SF 8 20dB)

30 minutes 5 minutes 30 secs 30 minutes 5 minutes 30 secs

1 > 4 years > 1 year 6 weeks > 5 years > 1 year 11 weeks

5 >7 years > 2 years 16 weeks >7 years > 4 years 23 weeks

Table 2: Lifespan indicated for LS VW-data logger 1 ch (using 1 C-size cell) and LS-VW- data logger 5 ch. (using 4 C-size cells)

22


NOTE: Extreme temperatures could cut down the capacity by 20 to 40%, Check battery

specifications. USB not used.

3.1.4 Configuration

The vibrating wire node requires configuration of the sweep frequency before starting. There are several

existing predefined sweep frequencies:

● Sweep Frequency A (450-1125 Hz)

● Sweep Frequency B (800-2000 Hz)

● Sweep Frequency C (1400-3500 Hz)

● Sweep Frequency D (2300-6000 Hz)

● Custom Sweep Frequency (min value: 300 Hz; max value: 7000 Hz).

To configure datalogger radio communications, see section 1.3 of this manual.

3.1.5 Data storage

The internal node has 4 MB of memory. The 5-channel data logger connected to five sensors stores up to

73,500 readings. The 1-channel data logger stores up to 200,000 readings. Times of data storage for LS data

logger 1 ch and LS data logger 5 ch are indicated in Table 3. Memory mode is a circular buffer. When

memory is full, logging continues by overwriting earliest readings. In addition to sensor data, Health data

is collected hourly, which indicates battery voltage, internal temperature of the node and node uptime.

Number of

sensors

Sampling rate

60 minutes 30 minutes 10 minutes

1 more than

10 years

more than

20 years 3.5 years

5 8 years 4 years 17 months

Table 3: Times of data storage (without overwriting) for VW-datalogger 1 ch and VW-datalogger 5 ch

23


3.2 GeoFlex Dataloggers


LS-G6-DIG data logger supports different sensor models by default (RS485 port):

● DGSI GeoFlex In-Place Inclinometers

https://durhamgeo.com/product/geoflex/

● Geosense Inclinometer

● RST inclinometer

● Sisgeo inclinometer

● MDT’s Multi-Point Borehole extensometer (MPBX)

The GeoFlex datalogger can power and read 10 GeoFlex sensors with the standard configuration

(57801705). The GeoFlex datalogger with external power (57801700) can power and read 50 GeoFlex sensors.

For other sensors, DGSI ensures that up to 30 Geosense/RST inclinometers

can be safely powered by the data logger. For the Sisgeo inclinometer, 15 can be powered1 . However

up to 60 sensors may be read and transmitted by the data logger. An external 12 V battery should be

connected if more sensors are to be supplied. In this case, contact DGSI.

The GeoFlex datalogger can also read MDT’s Multi-Point Borehole extensometer (MPBX) up to six anchor

points connected to a SMART Link-485 digital interface. It is also possible to read up to five MPBX with six

anchors each connected to one SMART Link-485 through a multiplexer.

Wiring is indicated in the RS485 port of the data logger. The data logger must be placed at HALF to read the

inclinometers. For the connection of digital data loggers at SDI ports, wiring must be checked at the sensor

specifications.

Note: Always remove plastic protection from Half/Full switch as it can cause erratic behavior on node.

1 Tested with a chain of 8 Sisgeo inclinometers. 24


http://www.sisgeo.com/products/inclinometers-and-tiltmeters/item/digital-mems-inclinometer-system.html

https://durhamgeo.com/product/geoflex/

a)

b)

c)

25


Figure 47: View of the inside of the GeoFlex data logger connected to a GeoFlex string; b)RST inclinometer; c) Sisgeo

inclinometer, placing a resistor between A and B is recommended according to the manufacturer’s specs.

d) MDT Multi Point Borehole Extensometer (MBPX)

d)

GeoFlex data loggers (Figure 47) can also support other digital sensors with SDI interface connections.

These types of sensors are not supported by default by the data logger, but drivers can be developed

by Worldsensing engineers. Please contact DGSI Tech Support to discuss additional sensor

types and to obtain a quote for the driver development.

Wiring for sensors with SDI interfaces will depend on the model of the sensor; however, the label of each

terminal is indicated.


The following table provides the indicative battery lifespan per channel (Table 4 and Table 5). Bear in

mind that consumption varies depending on the sensor used, sampling rate and environmental

conditions.

a) Geosense / RST IPI

Table 4: Indicative lifespan for GeoFlex datalogger. Estimates using 4 C-size cells

Number

of sensors

Sampling rate

6 hours 2 hours 30 minutes 5 minutes

10

(RS485) >10 years 5.5 years 2.5 years 4 months

30 (RS485) 5,2 years 10 months 4 months 26 days

b) Sisgeo IPI


Number

of sensors

Sampling rate

6 hours 2 hours 30 minutes 5 minutes

8 (RS485) 4 years 13

months 6 months 35 days

26


c) MDT Multi-Point-Borehole-Extensometers (MPBX)


Number

of sensors

Sampling rate

1 hour 30

minutes 5 minutes 1 minute

1 (RS485) > 7 years 6 years 2 years 20 weeks

3.2.3 Configuration

Configuration of a digital datalogger requires specifying communication protocol (from the options

provided) and bus addresses of inclinometric sensors connected to the RS485 port. This is done through

the Android Configuration app. The bus addresses of the digital sensors are specified by the

manufacturers. Up to 30 sensors can be connected in a bus chain. When connecting the sensors, we

recommend using resistors. In some cases, this is clearly specified by the sensor manufacturer.

Figure 48: View of different protocols on GeoFlex node sensor configuration

To configure radio communication of the datalogger, see section 1.3 of this manual.

27


3.2.4 Data storage

The datalogger has capacity for up to 90,000 readings from the inclinometers, which are two-axis

inclinometers with temperature variation calibration, grouped by 5 sensors. Is also has capacity for up to

90,000 readings for MPBX, grouped by 5 sensors (of 6 anchors). (Table 6).

Table 6: Indicative storage capacity of the GeoFlex datalogger. Estimate using 5 sensors.

Number of

sensors

Sampling rate


5 more than

10 years 5 years 20 months

28


3.3 Analog Datalogger


The Analog datalogger supports seven different sensor models that can be connected

independently to four different channels (Figure 48):

● Voltage (+/- 10 V peak to peak)

● Full Wheatstone Bridge (39.06 mV)

● Thermistor (-40 to 85 ºC for a standard 3Kohms)

● Current Loop (4-20 mA, 2 or 3 wires)

● Potentiometer (5 V)

● DGSI HD IPI

● PT100 (-40 to 85 ºC)

Figure 49: View of the Analog datalogger internally, where four channels can be identified

Sensor wiring is indicated in the Android configuration app, once the type of sensor to be

connected to the channel has been selected (Figure 49).

29


a) b) c)

d) e) f)

Figure 50: View of the wiring of different types of analog sensors, indicated in the Android Configuration App.

The datalogger can measure both voltage differential and single ended voltage sensor outputs. The

standard wiring is for differential. For single ended, it is necessary to wire the negative input of the data

logger to the datalogger ground.

Wiring can be connected once the Setup Wizard in the Android Configuration app has been initialized,

which is when the wiring schemes appear.

30


g)


The following tables provide the indicative battery lifespan for the Analog datalogger, (Table 7 a, b and c) depending on the type of sensor, the warm up time and the sampling rate. Bear in mind that consumption varies depending on the sensor used, sampling rate and environmental conditions.

Table 7: Indicative lifespan for Analog datalogger. Estimates using 4 C-size cells, considering SF9.

a)

Channels & sampling

Sensor features

Current

@12V@24mA

Current

@12V@24mA

Current

@24V@24mA

Current

@24V@24mA

Warm up time 1 second 5 seconds 1 second 5 seconds

1 CH 5 min 6 months 3 months 4 months 2 months

1 CH 30 min 2.5 years 1 year 2 years 1 year

1 CH 1 hour 5.5 years 2.5 years 3.5 years 1.5 years

1 CH 6 hours >10 years >10 years >10 years 9.5 years

4 CH 5 min 1.5 months 39 days 39 days 1 month

4 CH 30 min 9 months 7.5 months 7.5 months 6.5 months

4 CH 1 hour 1.5 years 1 year 15 months 1 year

4 CH 6 hours 8 years 6.5 years 6.5 years 5.5 years

31


b)

Channels & sampling

Sensor features

Voltage

@12V@24mA

Voltage

@12V@24mA

Voltage

@24V@24mA

Voltage

@24V@24mA

Warm up time 1 second 5 seconds 1 second 5 seconds

1 CH 5 min 5 months 2.5 months 1.5 years 2.5 months

1 CH 30 min 2.5 years 1 year 10 months 1.5 years

1 CH 1 hour 4.5 years 2.5 years 1.5 years 2.5 years

1 CH 6 hours >7 years >7 years >7 years >7 years

4 CH 5 min 2 months 1 month 1.5 months 25 days

4 CH 30 min 1 year 6 months 10 months 5 months

4 CH 1 hour 2 years 1 year 1.5 years 10 months

4 CH 6 hours >7 years 5 years >7 years 4.5 years

32


c)

Channels

&

sampling

Sensor features

FWB@5V

@0.7 kΩ

FWB@5V@

1.4 kΩ

Potentiome

ter@[email protected]

kΩ

Potentiometer

@5V@5 kΩ

Thermistor@5V

@3 kΩ PT100

1 CH 5

min

1.5

years

1.5 years 1.5 years 1.5 years 1.5 years 1 year

1 CH 30

min

>7 years >7 years >7 years >7 years >7 years 5.5 years

1 CH 1

hour

>7 years >7 years >7 years >7 years >7 years >7 years

1 CH 6

hours

>7 years >7 years >7 years >7 years >7 years >7 years

4 CH 5

min

5

months

6 months 6.5

months

7 months 7.5 months 4 months

4 CH 30

min

2.5 years 2.5 years 3 years 3.5 years 3.5 years 1.5 years

4 CH 1

hour

4.5

years

5.5 years 5.5 years 6 years 6.5 years 3.5 years

4 CH 6

hours >7 years >7 years >7 years >7 years >7 years >7 years

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3.3.3 Configuration

Configuration requires specifying the excitation power voltage and the warm up time for the sensors that need power supply (voltage and current loop sensors). For other sensors, 5V excitation supply is present in all channel connectors.Excitation power voltage can be 12V or 24V, and warm up times can be 100, 300 and 500 milliseconds or 1, 2, 5 and 10 seconds.

See section 2.3 for configuration of the radio communications of the datalogger.

3.3.4 Data storage

Capacity for up to 130,000 readings with four sensors connected (Table 8).

Number of

sensors

Sampling rate


4 more than

10 years 7 years 2.4 years

Table 8: Indicative storage capacity of the Analog datalogger. Estimates using four sensors.

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4. DATA ACQUISITION

Data is stored in dataloggers in comma separated value files (CSV). These files are available to download

using the Android application. Both readings and Health files can be downloaded.

For this purpose, an Android device must be connected to the node Mini USB port with a USB-OTG

cable. When the GTecLink application loads, data can be downloaded by clicking on the Download icon

in the “Sensors Data” tab. A Start and End date must be set, and data from that period will be downloaded.

The Android device allows these CSV files to be opened with downloaded applications such as e-mail or

cloud apps. Files are also stored on the device memory, on the SD Card, in the GTecLink folder.

GTecLink application: Readings dump to the Android device.

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5. CONTACT Durham Geo Slope Indicator

Phone : +1 425 588 0858 (12.00h - 24.00h UTC)

Technical support : [email protected]

General information : [email protected]

Durham Geo Slope Indicator

2175 West Park Court

Stone Mountain, Georgia 30087

United States of America

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mailto:[email protected]

mailto:[email protected]

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