OM-EL-USB-2-LCD
Instruction Sheet
OM-EL-USB-2-LCD
HUMIDITY, TEMPERATURE AND DEW POINT
DATA LOGGER WITH LCD DISPLAY DATA LOGGER
This standalone data logger measures and stores up to 16,379 relative humidity and 16,379 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 logger
and view downloaded data by plugging the module into a PC's USB port and using the supplied software. Relative
humidity, temperature and dew point (the temperature at which water vapour present in the air begins to
condense) data can then be graphed, printed and exported to other applications.
The high contrast LCD can show a variety of temperature and humidity information. At the touch of a button, the
user can cycle between the current temperature and humidity, along with the maximum and minimum stored
values for temperature and humidity.
The data logger is supplied complete with a long-life lithium battery, which can typically allow logging for three
months.
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
• High contrast LCD, with two and a half digit
temperature and humidity display function
• Environmental protection to IP67
• Immediate, delayed and push-to-start logging
• Supplied complete with replaceable internal lithium
battery and Windows control software
WINDOWS CONTROL SOFTWARE
Easy to install and use, the control software runs under Windows 2000, XP (Home and Professional Editions) and
Vista (32-bit). It allows the user to set up and download data from any EL-USB product. The latest version of the
control software may be downloaded from www.omega.com
DISPLAY FUNCTIONS
Six different functions are available, which can be cycled through using the built-in push button. The most recent
logged value, maximum logged value and minimum logged value can be displayed separately for humidity and
temperature. In addition, logging and alarm status is shown using two high intensity LEDs.
DATA LOGGER SETUP VARIABLES ORDERING INFORMATION
• Logger name
Stock Number
Standard Data Logger OM-EL-USB-2-LCD
(Data Logger, Software on
CD
and Battery)
Replacement Battery OM-EL-BATT
• °C, °F
• Logging rate (10s, 1m, 5m, 30m, 1hr, 6hr, 12hr)
• High and low alarms
• Immediate, delayed and push-to-start logging
• Display off, on for 30 seconds after button press , or
permanently on
• Data rollover (Allows unlimited logging periods by
overwriting the oldest data when the memory is full)
SPECIFICATIONS
Specification Min. Typ. Max. Unit
Relative Humidity Measurement range 0 100 %RH
Repeatability (short term) ±0.1 %RH
Accuracy (overall error) ±3.0* ±6.0 %RH
Internal resolution 0.5 %RH
Long term stability 0.5 %RH/Yr
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) ±1.1 (±2)**
°C (°F)
Logging rate every 10s every 12hr -
Operating temperature range † -35 (-31) +80 (176) °C (°F)
1/2AA 3.6V Lithium Battery Life*** 3 Months
* 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 LCD display.
† At temperatures below -20°C (-4°F) the LCD will exhibit slower response times of approximately 10 seconds.
LED AND LCD INDICATORS
The OM-EL-USB-2-LCD features a high contrast LCD and two bi-color LEDs. The LCD shows logged temperature and
humidity values using seven segment numbers, along with annunciators. The LCD can also show information
regarding the logging status.
LCD status indicators:
Display
LCD Mode
Logger status LCD always on LCD on button press LCD off
Displayed for 3
seconds after
button press
Always
displayed until
logging started
Displayed for 3
seconds after
button press
Displayed for 3
seconds after
button press
Delayed Start
Push to Start
Logging
Stopped
Always displayed until
logging started
Always displayed until
logging started
Not shown – recorded
data shown instead
Displayed for 3
seconds after button
press
Displayed for 3
seconds after button
press
Always displayed until
logging started
Not shown – logged
value shown instead,
after button press
Displayed for 3
seconds after button
press
The LEDs display the measurement status of temperature and relative humidity, marked °C / °F and %RH on the
logger.
The number of flashes and colours indicate:
(Single LED, Single Flash) The channel is logging, no alarm
(Single LED, Double flash) Delayed start
(Single LED, Triple flash) Logger full, no alarm
(Single LED, Single Flash) The channel is logging, low alarm
(Single LED, Double flash) The channel is logging, high alarm
(Single LED, Triple flash) Logger full, alarm
(Both LEDs, Double Flash) Push-to-start
LEDs Meaning Action
No LEDs flash
- No logging started.
or
- Battery fitted buy completely discharged.
or
- No battery fitted.
Plug the data logger into the PC and run the control software to find out
which condition applied.
Alternating green double flash every 10 seconds
- Logger configured for delayed start.
Dual double green flash every 10 seconds
- Logger configured for push-to-start.
Alternating greens single flash every 10 seconds
- Logger operating.
- Last stored Humidity and Temperature readings within set alarm levels.
(If hold 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 hold is enabled, then the alarm condition may have been triggered at any point
during the current logging session).
Alternating between single green and double red 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 hold is enabled, then the alarm condition may have been triggered at any point
during the current logging session).
Warning : Logger memory is full.
In this condition, hold is automatically enabled, and a flashing Green LED
indicates that no alarm condition has ever been logged. A Red LED indicates
that an alarm condition has been logger.
Warning : Battery is nearly discharged.
No alarm conditions are indicated.
Once the battery is exhausted, no LEDs will flash.
Start logging.
Replace battery.
Fit battery, start
logging.
No action needed,
logger will start at a
later date and time.
Press the logger
button when ready
to start logging.
None.
Alternating between green or red triple flash every 10 seconds
Download Data.
Simultaneous red single flash every 60 seconds
Fit new battery and
download data.
DIMENSIONS All Dimensions in mm
CAUTION
Exposure of the internal sensor to chemical vapours such as those produced by some plastics and foamed materials
may interfere with the internal sensor and cause inaccurate readings to be logged. In a clean environment, this will
slowly rectify itself, therefore ensure that the logger is used in a ventilated area i.e. air exchange is allowed.
Exposure to extreme conditions or chemical vapours 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 (7090°F) at >74% RH for 48h (re-hydration).
High levels of pollutants may cause permanent damage to the internal sensor.
M4749/0109
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