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EL-USB-2 EasyLog Data Logger for Temperature, Relative Humidity and Dew Point

The EL-USB-2 data logger measures and stores up to 16382 relative humidity and 16382 temperature readings over 0 to 100 % RH and -35 to +80°C (-31 to +176°F) measurement ranges. The user can easily set up the logging rate and start-time, and download the stored data by plugging the data logger into a PC’s USB port and running the purpose designed software. Relative humidity, temperature and dew point (the temperature at which water vapor present in the air begins to condense) data can then be graphed, printed and exported to other applications. The data logger is supplied complete with a long-life lithium battery, which can typically allow logging for a year. Status indication is via flashing red and green LEDs.

Features

  • 0 to +100 % RH Measurement Range
  • -35 to +80°C (-31 to +176°F) Measurement Range
  • Dew point automatically calculated from RH and temperature
  • USB Interface for Set-up and Data Download
  • User-Programmable Alarm Thresholds for %RH & T
  • Status Indication via Red and Green LEDs
  • Supplied with Replaceable Internal Lithium Battery

Programmable Elements

  • Logger Name
  • °C, °F
  • Logging Rate (10 s, 1 min, 5 min, 30 min, 1 h, 6 h, 12 h)
  • High and Low Alarms for humidity and temperature
  • Start Date and Start Time

Specifications

Parameter Minimum Typical Maximum Unit

Relative Humidity:
 

Measurement range:

0

  

100

% RH
 

Humidity repeatability (short term):

  

±0.1

  

% RH
 

Accuracy (overall error, 20 ... 80 % RH):

  

±3.0 *

  

% RH
 

Internal resolution:

  

0.5

  

% RH
 

Long-term stability:

  

0.5

  

% RH/year

Temperature:
 

Measurement range:

-35 (-31)

  

+80 (+176)

°C (°F)
 

Repeatability:

  

±0.1 (±0.2)

  

°C (°F)
 

Accuracy (overall error):

  

±0.5 (±1)

±2 (±4)

°C (°F)
 

Internal resolution:

  

0.5 (1)

  

°C (°F)

Dew Point:
 

Accuracy (overall error, 25 °C, 40 ... 100 % RH):

  

±1.1 (±2) **

  

°C (°F)

Logging rate:

every 10 s

  

every 12 h

  

Memory capacity:

  

16382

  

samples

Operating temperature range:

-35 (-31)

  

+80 (+176)

°C (°F)

Battery life:

  

1 ***

  

Year

* This specifies the overall error in the logged readings, for relative humidity measurements between 20 and 80%RH.
** This specifies the overall error in the calculated dew point, for relative humidity measurements between 40 and 100%RH at 25°C.
*** Depending on sample rate, ambient temperature and use of alarm LEDs

Easylog Record Times

Sampling Interval Record Times

1 sample every 10 seconds

45 hours

1 samples every minute

11 days

1 sample every 5 minutes

56 days

1 sample every 30 minutes

11 months

1 sample every hour

1.8 years

1 sample every 6 hours

>2 years

1 sample every 12 hours

>2 years

Dimensions

Dimensions of data logger EL-USB-2

Dimensions in inches (mm)

LED Flashing Modes

The EL-USB-2 data logger features 2 bi-color LEDs; one LED represents temperature measurement, the other represents RH. Each is clearly marked on the logger. To save power, the status indication alternates between the two channels every 10 seconds. First you will see the status of the temperature logging and 10 seconds later you will see the status of the RH logging and so on.

LED indication fig 1
LED-Anzeige Bild 2

Green Double Flash
The data logger is not currently logging, but is primed to start at a later date and time (delayed start).

Green Single Flash
The data logger is currently logging. No alarm on the channel.

Red Single Flash
The data logger is currently logging. Low alarm on the channel.

Red Double Flash
The data logger is currently logging. High alarm on the channel.

Green Triple Flash
The data logger is full and has stopped logging. No alarm on the channel.

Red Triple Flash
The data logger is full and has stopped logging. Alarm (high, low or both).

No LEDs Flash
The data logger is stopped, the battery is dead, or there is no battery.

Ordering Information

Order Number Description

EL-USB-2

RH, Temp, and Dew Point Data Logger
Includes EL-USB-2 data logger, software on CD, and battery.

BAT 3V6

Battery
Replacement battery.

Further Information

EL-WIN-USB Software

Further information about the free EL-WIN-USB software

EL-DataPad

Further information about the EL-DataPad, the portable viewer.

Information in the PDF datasheet (see above) may be more detailed. Due to continual product development, ALTHEN and partners reserve the right to vary the foregoing details without prior notice.