EL-USB-2
Humidity, Temperature and Dew Point USB Data Logger
This data logger measures and stores up to 16,382 relative humidity and 16,382 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 starttime, and download the stored data by plugging the module straight into a PC's USB port and running the purpose
designed software under Windows 98, 2000 or XP. 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. The logger is protected against ingress from water and dust
to IP67 standard when the plastic cap and seal are fitted.
FEATURES
• 0 to +100%RH Measurement Range
• -35 to +80°C (-31 to +176°F) Measurement Range
• Dew point indication via Windows Control Software
• 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
and Windows Control Software
• Environmental Protection to IP67
°C/°F
%RH
WINDOWS CONTROL SOFTWARE
Easy to install and use, the control software runs under Windows 98, 2000 and XP (Home and Professional Editions). It
allows the user to set up and download any EL-USB-2. The latest version of the control software may be downloaded
from .www.lascarelectronics.com
DATA LOGGER SET-UPS
• Logger Name
• °C, °F
• Logging Rate (10s, 1m, 5m, 30m, 1hr, 6hr, 12hr)
• High and Low Alarms for Humidity and Temperature
• Start Date and Start Time
ORDERING INFORMATION
Stock Number
Standard Data Logger EL-USB-2
(Data Logger, Software on CD
and Battery)
Replacement Battery BAT 3V6
SPECIFICATIONS
Specification Min. Typ. Max. Unit
Relative Measurement range 0 100 %RH
Humidity Repeatability (short term) 0.2 %RH
Accuracy (overall error) (20-80%RH) 3.5** %RH
Response time 5 sec
Long term stability 1
Temperature Measurement range -35 (-31) +80 (176) °C (°F)
Repeatability
Accuracy (overall error)
Response time
Dew Point Accuracy (overall error) (25°C, 40-100%RH) 2 ( 4)*** °C (°F)
Logging rate every 10s every 12hr Operating temperature range -35 (-31) +80 (176) °C (°F)
1/2AA 3.6V Lithium Battery Life* 1 Year
* Depending on sample rate, ambient temperature and use of alarm LEDs
** 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.
See page 4 of this datasheet for accuracy graphs.
+
+
%RH/Yr
0.2 ( 0.4) °C (°F)
++
1 ( 2) 2.5 ( 5) °C (°F)
++ + +
20 sec
++
Martel Electronics Corporation Tel: 800-821-0023
PO Box 770 Email: sales@martelcorp.com
Londonderry, NH 03053 USA Web: www.martelcorp.com
© Copyright 2005 Martel Eectronics Corporation All trademarks are the property of their respective owners. P/N 000000000 Rev. x
EL-USB-2
Humidity, Temperature and Dewpoint USB Data Logger
LED FLASHING MODES
EL-USB-2 features 2 bi-colour 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. So 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.
1.
TRH
10 seconds later
TRH
2. The number of flashes and colours indicate :
(Single flash) The channel is logging, no alarm
(Double flash) Delayed start
(Triple flash) Logger full, no alarm
(Single flash) The channel is logging, low alarm
(Double flash) The channel is logging, high alarm
(Triple flash) Logger full, alarm
2 Martel Electronics Corporation DT-EL-USB2
EL-USB-2
Humidity, Temperature and Dewpoint USB Data Logger
LED FLASHING MODES
LEDs Meaning Action
No LEDs flash
- No logging started. Start logging.
or
RH T
- Battery fitted but completely discharged. Replace battery.
or
- No battery fitted. Fit battery, start logging.
Plug the data logger into the PC and run the control software
to find out which condition applies.
Repeating
sequentially
RH T RH T
RH T RH T
RH T
after 10s
RH T
10s
10s 10s
or
10s 10s
or
Alternating green double flash every 10 seconds
- Logger configured for delayed start. No action needed,
logger will start at a
later date and time.
Alternating green single flash every 10 seconds
- Logger operating. None
- Last stored Humidity and Temperature readings within set
alarm levels.
(if latching is enabled, then a flashing Green LED indicates that no
alarm condition has ever been logged)
Alternating between green and red single flash every 10 seconds
- The green LED indicates the parameter that is within set
alarm levels.
- The red LED indicates the parameter for which the Low
Alarm level has been exceeded.
(if latching is enabled, then the alarm condition may have
been triggered a while ago)
Alternating between green single and red double flash every 10 seconds
- The green LED indicates the parameter that is within set
alarm levels.
- The red LED indicates the parameter for which the High
Alarm level has been exceeded.
(if latching is enabled, then the alarm condition may have
been triggered a while ago)
RH T RH TRH T RH T
10s 10s10s 10s
oror or
RH T
60s
Alternating between green or red triple flash every 10 seconds
Warning
In this condition, latching is automatically enabled, and a flashing Green
LED indicates that no alarm condition has ever been logged.
Simultaneous red single flash every 60 seconds
Warning
: Logger memory is full. Download data.
: Battery is nearly discharged. Fit new battery and
No alarm conditions are indicated. download data.
Once the battery is exhausted, no LEDs will flash.
DT-EL-USB2 Martel Electronics Corporation 3
EL-USB-2
Humidity, Temperature and Dewpoint USB Data Logger
DIMENSIONS All dimensions in mm (inches)
Internal Relative Humidity and Temperature Sensor Location
26.4 (1.04)
103 (4.06)
BATTERY REPLACEMENT
Werecommend that you replace the battery every 12 months, or prior to logging critical data.
The EL-USB-2 does not lose its stored readings when the battery is discharged or when the battery is replaced; the
data logging process will however be stopped and cannot be re-started until the battery has been replaced and the
logged data has been downloaded to PC.
Only use 3.6V 1/2AA lithium batteries. Check with your supplier that the battery you are ordering is 'press fit' and
is not fitted with solder tags. Before replacing the battery,removethe EL-USB-2 from the PC.
Note:
Leaving the EL-USB-2 plugged into the USB port for longer than necessary will cause some of the battery capacity
to be lost.
WARNING: Handle lithium batteries carefully, observe warnings on battery casing.
Dispose of in accordance with local regulations.
RECONDITIONING PROCEDURE
Exposure of the internal sensor to chemical vapors may interfere with the internal sensor and cause inaccurate
readings to be logged. In a clean environment, this will slowly rectify itself. However, exposure to extreme
conditions or chemical vapors will require the following reconditioning procedure to bring the internal sensor back
to calibration state.
80°C (176°F) at < 5%RH for 36h (baking) followed by
20-30°C (70-90°F) at > 74%RH for 48h (re-hydration)
High levels of pollutants may cause permanent damage to the internal sensor.
MEASUREMENT ACCURACY
4 Martel Electronics Corporation DT-EL-USB2
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