DL-4V Data Logger

This data logger is used for monitors that use a voltage analog output signal. The DL-4 data logger measures and transmits temperature, relative humidity, and light intensity data wirelessly. It also includes an external analog input to attach a variety of additional sensors. This self-contained wireless data logger lets you use your mobile device or Windows computer and Onset’s free HOBOconnect app to access data, at any time, over a 100-foot range via Bluetooth Low Energy (BLE) technology.

Part Number: DL-4V


What Measurements Does This Data Logger Support?

The DL-4V data logger supports monitors that use a voltage analog output signal. We also offer the DL-4C data logger that supports monitors that use a current analog output signal.


1-Channel vs. 4-Channel:

DL-4V data loggers has a 1-channel default configuration, but there is also an option to order them with 4-channel inputs. Note: The 1-Channel DL-4V is capable of measuring temperature, relative humidity, and light intensity. The 4-channel DL-4V does not have this capability, the 4-channel option will only work as wireless data logger for multiple sensors. For ordering your DL-4V, you will be able to choose between 1-3 additional cables with your data logger (the DL-4V's default is one 0-5 VDC cable). When purchasing multiple cables, we only offer the ability to purchase the same kind of cable. If you would like to purchase an assortment of cables (ex: two 0-5 VDC cables and two 4-20 mA cables) please contact us and we'd be happy to process the order.  


Compatible Monitors:

C-21 VOC Gas Sensor

C-30ZX Ozone Monitor

OA-1 Ozone Alarm

OS-6 Ozone Monitor

OEM-3 Ozone Controller


Main Features:

- Bluetooth communication for wireless data offload

- 16-bit resolution for highly-accurate measurements

- Stores 1.9 million measurements for longer deployments between offloads

- New Self-Describing sensors with automatic configuration for fast deployment

- Compatible with existing sensors for a wide range of indoor monitoring

- Audible and visual LCD-screen alarms notify you if sensor becomes unplugged or a reading exceeds set thresholds


DL-4 App:

*Data tracking on the DL-4V, information is saved so it can be reviewed later or printed off.


*Custom parameters you can set for data logging


Sensor Specifications:

Temperature Sensor  
     Range -20° to 70°C (-4° to 158°F)
     Accuracy ±0.20°C from 0° to 50°C (±0.36°F from 32° to 122°F)
     Resolution 0.002°C at 25°C (0.004°F at 77°F)
     Drift <0.1°C (0.18°F) per year
RH Sensor  
     Range 0% to 100% at -20° to 70°C (-4° to 158°F); exposure to conditions above 95% may temporarily increase the maximum RH sensor error by an additional 1%
     Accuracy ±2.5% from 10% to 90% (typical) to a maximum of ±3.5% including hysteresis at 25°C (77°F); below 10% and above 90% ±5% typical
     Resolution 0.01%
     Drift <1% per year typical
Response Time  
     Temperature 11 minutes in air moving 1 m/s (2.2 mph)
     RH 30 seconds to 90% in airflow of 1 m/s (2.2 mph)
Light Sensor  
     Range 0 to 167,731 lux (15,582 lum/ft2)
     Accuracy ±10% typical for direct sunlight (see Light Measurement on page 4 for more details)

Logger Specifications:

Operating Range -20° to 70°C (-4° to 158°F)
Radio Power 1 mW (0 dBm)
Transmission Range Approximately 30.5 m (100 ft) line-of-sight
Wireless Data Range Bluetooth Low Energy (Bluetooth Smart)
Logging Rate 1 second to 18 hours
Logging Modes Fixed interval (normal, statistics) or burst
Memory Modes Wrap when full or stop when full
Start Modes Immediate, push button, date & time, or next interval
Stop Modes When memory full, push button, date & time, or after a set logging period
Restart Mode Push button
Time Accuracy ±1 minute per month at 25°C (77°F)
Battery Type Two AAA 1.5 V alkaline batteries, user replaceable
Memory 4 MB (1.9 million measurements, maximum)
Full Memory Download Time Approximately 4 to 15 minutes depending on the mobile device; may take longer the further the device is from the logger
LCD LCD is visible from 0° to 50°C (32° to 122°F); the LCD may react slowly or go blank in temperatures outside this range
Size 11.28 x 5.41 x 2.92 cm (4.44 x 2.13 x 1.15 in.)
Weight 123 g (4.34 oz)
Environmental Rating IP54


Downloadable Content:

     -Data Sheet

     -Data Logger Manual

     -Quick Start PDF

More Information
Manufacturer Eco Sensors
Call For Price No
Warranty 1 Year
Monitor Type A-22, C-21, C-30ZX
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