Ecomatik DL18 BLE Manuale utente

DL18 BLE

Data Logger

ECOMATIK GmbH

Muenchner Str. 23

D-85221 Dachau/Germany

Tel.: +49 8131 260 738

Fax: +49 8131 260 736

e-mail: [email protected]

website: www.ecomatik.de

User Manual

Version 2022

Dendrometer Data Logger DL18 BLE

1. Introduction

Thank you for purchasing our ECOMATIK DL18 BLE data logger set. This BLE-enabled

(Bluetooth Low Energy) data logger is an outstanding choice to be used in combination

with ECOMATIK dendrometers (all models), temperature sensors (leaf: LAT-B2; air, sur-

face, tissue, soil: T-Surface/-Tissue/-Soil), air temperature and humidity sensor (T/RH-

Sens), soil moisture sensor (EM 35) or light sensors (PAR: EM 20, Pyranometer: EM 25).

Using the four channels of the DL18 BLE you can operate up to 4 dendrometers, or other

sensor combinations. The DL18 BLE can be conveniently configured and the logged data

read out via mobile devices (Andriod, iOS) or PC (Windows10).The logger is powered by

two user replaceable batteries. In standard use the batteries will last more than one year.

2. Components

After unpacking you should have following items:

1 dendrometer logger with two AAA alkaline batteries already inserted

1 weather box for using the logger under outdoor conditions

1 bag of desiccant (dry silica gel)

2 two wood screws for mounting the logger box

Fig. 1: Dendrometer Data Logger (DL18 BLE)

3. Safety information and Maintenance

For the functionality it is very important to protect the logger against moisture. Screw the

cable gland firmly and replace the silica gel when necessary. In tropical regions the pro-

tection from moisture is particularly important.

In normal use the battery lasts for more than a year. But remember, some batteries have

poor quality. Therefore, it is useful to log the battery voltage. Check the battery indicator at

data download. If you are planning a long measurement period under low temperature,

you should use Lithium batteries instead of provided alkaline batteries. Lithium battery has

much better properties at low temperature.

Dendrometer Data Logger DL18 BLE

4. Connecting dendrometers to the logger

As the fig. 3 shows, you can connect up to 4 dendrometers to the logger.

It is very important to protect the logger against moisture. Insert the sensor cable until the

thicker black cable insulation is positioned in the cable gland (see Fig. 2). Tighten the ca-

ble gland firmly, and never remove the rubber plug from the unused cable glands.

Fig. 2 Connecting sensor cables to the logger

5. Installing the software

The DL18 BLE can be conveniently configured and logged data read out via mobile de-

vices (Andriod, iOS) and PC (Windows10) using the free software HOBOconnect:

https://www.onsetcomp.com/products/software/hoboconnect/

6. Configuring the logger

The software has many useful features. However, for dendrometers you mainly need only

the main functions as described in the following:

1) Find and connect to Bluetooth Logger

Fig. 3: Search screen and Device list

Dendrometer Data Logger DL18 BLE

2) Logger Status overview, Data download & Enter Configuration mode

3) Launch Logger: Launch logger and configure Channel and Sensor.

Fig. 4: Deployment information and Logger Setup (Logging interval, Start mode)

Dendrometer Data Logger DL18 BLE

Fig. 5: Logger Setup (Stop mode) and Logger channels list

Fig. 6: Sensor and Channel setup

Dendrometer Data Logger DL18 BLE

4) Raw Data conversion & Linear scaling

Fig. 7: Linear scaling function

On-logger linear data conversion:

If configured as “Adapter Cable, Cable-2.5-Stereo (0-2.5 Volts DC)”, the raw measured

data is in units of volts, ranging between 0 and 2.5 VDC. In case of a linear relationship

between raw sensor output voltage and the parameter measured by the sensor, the linear

scaling function can be configured to convert raw voltage signals directly on the logger

(see Fig. 7). This is possible for all dendrometers except for the models DC3 and DC4, the

air temperature and humidity sensor (T/RH-Sens), soil moisture sensor (EM 35), and light

sensors (PAR: EM 20, Pyranometer: EM 25). The on-Logger linear scaling is configured

via two value pairs (e.g. 0 VDC / X and 2.5 VDC / Y). The parameters X and Y are sensor

dependent and in case of dendrometers X is always 0 (i.e. 0 VDC corresponds to 0 mi-

crometer), whereas Y differs depending on the dendrometer model the different Y factors

are.

Fig. 8 Enter linearization data

For example for 11000 micrometer range sensors (e.g. DD-S2, DR3, DD-L1,…) the cor-

rect configuration is: 0 VDC / 0 micrometers and 2.5 VDC / 11000 micrometers.

Change the value in this field as follows. Other 3 data fields remain unchanged.

11,000.0000 for DR1, DR3, DD-L1, DD-S1, DD-S2, DRO, DRW, DDW, DC1, DV, DF1

25,400.0000 for DC3, DD-L2, DR2, DF2

50,800.0000 for DC4, DD-L3, DF3

150,000.0000 for DF4

Dendrometer Data Logger DL18 BLE

Post-hoc data conversion:

Another option is to measure and store raw values in Volts on the logger and perform the

conversion after data download to the computer.

This option is also required, if the relationship between raw voltage output of the connect-

ed sensor and the measured parameter is not linear (e.g. LAT & T temperature sensor se-

ries). Raw dendrometer data from the logger has the unit Volt and can be converted to

micrometer values by using the following formulas:

Dendrometer types DR1, DR3, DR3W, DD-L1, DD-L1W, DD-S1, DD-S2, DD-S2W, DD-

RO, DR1W, DC1, DV, DF1 Micrometer = raw data (V) x 4400

Dendrometer type DC3, DD-L2, DR2, DF2

Micrometer = raw data (V) x 10160

Dendrometer type DC4, DD-L3, DF3

Micrometer = raw data (V) x 20320

For Dendrometer type DF4

Micrometer = raw data (V) x 60000

For other sensor types, e.g. leaf temperature (LAT-B2), surface, tissue or soil temperature

(T-Surface/-Tissue/-Soil), air temperature/humidity (T/RH-Sens) or soil moisture, raw sen-

sor signal will also be recorded in volts. Due to the complex conversion functions of these

sensor types, raw sensor values have to be converted manually after data download to

your personal computer. For conversion, please use the conversion functions as given in

the user’s manual of the respective sensor (Excel programs for data conversion are avail-

able on request).

5) Download, view and export data

Fig. 9: Download data from Logger and export data to file

Dendrometer Data Logger DL18 BLE

7. Technical Specifications

Memory

1 900 000 readings

If you connect 4 dendrometers, and collect data every 30 minutes, the

memory will store data of 7900 days

Resolution

0.2 µm for Dendrometer types:

DR1, DR3, DD-L1, DD-S1, DD-S2, DRO, DRW, DDW, DC1, DV

0.3 µm for Dendrometer types:

DC2, DF1

0.5 µm for Dendrometer type:

DC3, DD-L2, DR2, DF2

1.0 µm for Dendrometer type:

DC4, DD-L3, DF3

Accuracy

±0.1% of reading

Interface

Bluetooth Low Energy to Mobile devices or PC:

iOS 11, 12 and 13

Android 7, 8, 9 and 10

Windows 10

Bluetooth 4.X and up

Channel

4, for connecting up to 4 dendrometers

Logging Interval

1 sec. to 18 hours, user selectable

Battery Life

1 year typical with logging rate of 1 minute and sampling interval of 15 sec-

onds or greater, user replaceable 2 AAA battery

Environment

Logging -20° to 70°C (-4 to 158°F); 0 to 95% RH (non-condensing)

Other compatible

Sensor types

- soil moisture (EM 35)

- leaf temperature (LAT-B2)

- surface, tissue or soil temperature (T-Surface/-Tissue/-Soil)

- air temperature/humidity (T/RH-Sens)

- light (PAR: EM 20, Pyranometer: EM 25)

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