EnvLogger system T2.4 / T7.3

OverviewThe EnvLogger system comprises a miniaturised, rugged temperature logger and a companion smartphone app. Both were designed with an emphasis on reliability and ease of use. The logger communic

Product Name：EnvLogger system T2.4 / T7.3
Model：T2.4 / T7.3
Maunufactor：ElectricBlue
Country：Portugal

OVERVIEW
SPECIFICATIONS

Overview

The EnvLogger system comprises a miniaturised, rugged temperature logger and a companion smartphone app. Both were designed with an emphasis on reliability and ease of use. The logger communicates with a smartphone using wireless Near Field Communication technology. To communicate, it is only necessary to “tap” the loggers with the smartphone.

Hardware formats

EnvLoggers are available in two hardware formats, T2.4 and T7.3.

T7.3 is vastly superior to T2.4 regarding memory, battery life and clock drift, but is slightly larger and more expensive.

Encapsulation options

Both hardware versions (T2.4 and T7.3) can be supplied in a virtually endless variety of shapes and colours. These can be grouped into three main categories:

1. naked electronics;

2. encapsulated in hard acrylic, and

3. as biomimetic loggers (resembling real animals).

The hard acrylic disks are completely watertight and can be deployed in dusty, subaquatic, UV-rich, or moderately corrosive environments. They are also quite resistant to mechanical stress, and because communication is wireless, they can be embedded in hard materials such as rocks (or made into biomimetic loggers). Look below for a comparative table between the various readily available formats. Custom-made formats are available upon request.

Companion app

EnvLoggers communicate via a dedicated app, freely available for Android and iOS smartphones. On your smartphone, go to the Android's PlayStore or to the iOS App Store and download the app EnvLogger Viewer. If your smartphone is incompatible, the app will not appear in the store. Keep the app updated to benefit from new features.

Citizen science

With the dedicated smartphone app, logger servicing is rapid and easy. This, in turn, facilitates the establishment and maintenance of large networks of loggers serviced by multiple scientists and/or citizens.

Introduction to ElectncBlue's EnvLogger System: https://youtu.be/jYdza-NEHNU

Available hardware formats for temperature (T) Envloggers

Parameters	Hardware T2.4	Hardware T7.3
Memory capacity at 0.5 ºC resolution	> 12k readings* (enough for 16.5 months at 1 sample/hour)	262k readings (enough for 30 years at 1 sample/hour)
Memory capacity at 0.1 ºC resolution	> 10k readings* (enough for 13.5 months at 1 sample/hour)	131k readings (enough for 15 years at 1 sample/hour)
Minimum battery lifespan at 20 ºC**	Approximately 5 years at 1 sample/hour	Approximately 15 years at 1 sample/hour
Temporal resolution	Programmable between 10 sec and 18 hours	Programmable between 10 sec and 60 minutes
Maximum start delay	10 years	60 minutes
Maximum clock drift	75 to 100 seconds/month	8 seconds/month
Size on disk of a full log file	Approximately 1 Mb	Approximately 5.4 Mb
Max download time of a full log	2 minutes (Android and iOS)	4 minutes (Android) or 6 minutes (iOS)
Maximum NFC range	8.8 to 19.0 mm, depending on the phone	6.3 to 18.6 mm, depending on the phone
Average temperature precision and accuracy	±0.04 °C precision and 0.21 °C accuracy
Operational temperatures	- 30 ºC to + 60 °C. Note that battery performance decreases dramatically at temperature extremes.
Temperature resolution	Programmable to 0.1 ºC or 0.5 ºC

* T2.4 uses data compression and typically can store more readings than these, which are the guaranteed minimum.

** battery duration for a 27mm logger. The 21.5 mm logger only has 3 years of battery life. Actual battery life depends on the temperatures at which loggers are exposed to.

Encapsulation options for T2.4

Parameters	Naked	Robolimpet	Robomussel	21.5 mm EnvLogger	27 mm EnvLogger		27 mm EnvLogger with zip-tie mounting holes		27 mm EnvLogger with M6 mounting holes
Note that the 5 formats on the right can be produced in any color
Type of enclosure	Disposable clapsule	Hard and inert acrylic resin
Weight	4.5 g	-	50 g	5 g	9.5 g		10 g		13 g
Diameter at the base	16.5 mm	45 x 52 mm	-	21.5 mm	27 mm		[distance between holes: 33 mm]		[distance between holes: 43 mm]
Diameter at the top	14 mm	-	-	18 mm	24.5 mm		21 mm		24.9 mm
Height	7.5 mm	15 mm	-	10 mm	11 mm		11 mm		11 mm
Structural robustness	Very fragile	Best
Thermal inertia (time to reach 90% of a sudden change in temperature)	-	Not tested yet	Not tested yet	3 min and 16 sec	4 min and 24 sec	5 min and 15 sec		Not tested yet
Waterproofing	No	Tested in a pressurized water bath. Loggers withstood 56 bar + 100 cycles of pressurization between 0 and 20 bar (equivalent to a dive to 560m + 100 dives to 200m)**

Encapsulation options for T7.3

Parameters	Robomussel	29 mm EnvLogger		29 mm EnvLogger with zip-tie mounting holes		29 mm EnvLogger with M6 mounting holes
Note that the formats on the right can be produced in any color
Type of enclosure	hard and inert acrylic resin
Weight	50 g	11.5 g		14.5 g		15 g
Diameter at the base	-	29 mm		[distance between holes: 36 mm]		[distance between holes: 46 mm]
Diameter at the top	-	29 mm		29 mm		29 mm
Height	-	11.5 mm		11.5 mm		11.5 mm
Structural robustness	Best
Thermal inertia (time to reach 90% of a sudden change in temperature)	Not tested yet	Not tested yet, but slightly higher than the value of the 27 mm	Not tested yet, but slightly higher than the value of the 27 mm		Not tested yet, but slightly higher than the value of the 27 mm
Waterproofing	Similar to v2.4

EnvLogger system T2.4 / T7.3

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