Mini-Systems with Data Logger DL 18 or DL 18 - BLE
Our Mini-Systems are based on the data loggers DL 18 (interface: USB to PC withWindows or MacOS) or DL 18-BLE (interface: Bluetooth Low Energy to Windows PC, orTablet / Smartphone with Android or iOS).
Both loggers feature 4 precise and high-resolution measuring channels (temperature-compensated, 16 bits) for connecting various analogue sensors, such as dendrometers, soil moisture sensors, temperature probes (T-soil,T-surface,T-Tissue), leaf temperature sensors (LAT-B3),and T/RH air sensor.
A possible sensor combinations would be for example: 1x dendrometer + 1x T/RH air sensor (this sensor type occupies 2 channels) + 1x soil moisture sensor (max. number of soil moisture sensors per DL 18 is 1 piece, due to the higher power consumption of this sensor type).
Our mini measuring system can operate independently due to their robustness (weather resistant protective box and metal roof are included); battery-operative, extremely low power consumption (2replaceableAAA batteries, lifetime> 1 year);as well as their large internal memory (1,900,000 data points). Mini-Systems are thus ideal for long-term measurements in outdoor conditions with a spatially decentralized distribution of the measuring points
Advantages
- Small, robust, weatherproof
- User friendly: easy sensor connection with stereo plug, easy configuration and data readout via PC or smartphone/tablet, control buttons for the most important functions directly on the logger device, LCD display can be turned off (displayable information includes current measurement values, recording status, alarms, battery status, memory usage)
- Extensive measurement functions: average, event-controlled burst-measurements, measurement-value-controlled alarms, etc.
- Precise and high-resolution measurements
- Low power consumption, powered by 2 AAA batteries; very long battery life
- Large measurement data memory
Specific to the DL 18-BLE model
- Wireless configuration and data transmission via Bluetooth Low Energy to Windows-PC, Tablet or Smartphone with Andriod or iOS
Limits
- Only 4 channels
- On the logger itself, linear conversions of the raw readings can be programmed and carried out; however, complex conversions must be performed post-hoc, after data download of the raw measured values (e.g., in a spreadsheet program)
Technical data
Logger-Type | Mini Logger DL 18 | Mini Logger DL 18-BLE |
Scope of application | Battery-powered data recording in outdoor conditions | Battery-powered data recording in outdoor conditions. Bluetooth data transfer to smartphone/tablet particularly advantageous if logger accessibility is difficult (e.g., if attached to a greater height in the tree) |
Compatible Sensors | Sensors with analogue output signal: - Dendrometer (all models) - Temperature sensors (T-Series) - Leaf temperature sensor (LAT-B3) - T/RH air sensor (EM 14) - Soil moisture sensor (SMT100) - Light sensors (Par: EM 20; Pyranometer: EM 25) | Sensors with analogue output signal: - Dendrometer (all models) - Temperature sensors (T-Series) - Leaf temperature sensor (LAT-B3) - T/RH air sensor (EM 14) - Soil moisture sensor (SMT100) - Light sensors (Par: EM 20; Pyranometer: EM 25) |
Special features/limitations | Small; robust, weatherproof metal box; cost-effective; easy to use; long battery life | Small; robust, weatherproof plastic box; wireless communication with mobile devices via Bluetooth; cost-effective; easy to use; long battery life |
Number of measuring channels & measuring range | 4 channels for 0 to 2.5 V | 4 channels for 0 to 2.5 V |
Recording interval | Adjustable between 1 sec and 18 hours (averaging possible) | Adjustable between 1 sec and 18 hours (averaging possible) |
Storage capacity | 4 MB (max. 1,900,000 measured values) e.g. For 4 channels and 30 minutes recording interval sufficient for 7,900 days | 4 MB (max. 1,900,000 measured values) e.g. For 4 channels and 30 minutes recording interval sufficient for 7,900 days |
Resolution | 40 μV e.g.: Dendrometer, depending on the model: 0.2 to 1 μm T-Series, LAT-B2: 1.6 * 10-3 ° C | 40 μV e.g.: Dendrometer, depending on the model: 0.2 to 1 μm T-Series, LAT-B2: 1.6 * 10-3 ° C |
Accuracy | ± 0.1 mV ± 0.1% of measured value | ± 0.1 mV ± 0.1% of measured value |
By the logger supplied sensor excitation voltage | 2.5 V (switched, stabilized) | 2.5 V (switched, stabilized) |
Logger powering & battery life | 2x AAA cell, user-replaceable Battery life: typically 1 year with a logging interval of 1 minute | 2x AAA cell, user-replaceable Battery Life: typically 1 year with a logging interval of 1 minute and activated Bluetooth |
Interface | USB to PC (Windows or MacOS) | Bluetooth Low Energy to Windows-PC, tablet or smartphone (Android or iOS); range up to 30 m line-of-sight |
Operational conditions | Normal outdoor conditions, recording -20 to 70 ° C, 0 to 100% relative air humidity | Normal outdoor conditions; recording -20 to 70 ° C, 0 to 100% relative air humidity |
Size and Weight | 17x13x8 cm, 725 g (complete in metal protection with mounting plate) | 17x13x8 cm, 600 g (complete in plastic protection with mounting plate) |
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