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OM-DLT Temperature Data Logger
OM-DLT DATA LOGGER INSTRUCTIONS
The OM-DLT Data Logger is a self-contained precision instrument for recording
the temperature of the surrounding environment. The OM-DLT can store up to
10,000 measurements for each recording. The recordings can be read on a
computer using the supplied PC interface or the optional OM-DP3 dataplotter.
The Windows™ compatible software allows the user to set the OM-DLT for a
recording session read the recorded data in text or graphical format and to store
the recorded data for future reference or analysis. Applications include
monitoring of environmental areas, coolers, freezers, food or storage areas,
laboratories, greenhouses, museums, etc. Refer to the following instructions for
explanations of how to record and how to retrieve temperature recordings.
SOFTWARE INSTALLATION
The Data Logger to PC program is supplied on 3½″ floppy disks. To install the
software follow the instructions below:
1. Insert disk 1 of 2 into Drive A.
2. If you are using Window™98/95, click on START, then click on RUN.
3. Type A:SETUP and press Enter.
4. If you are using Windows™3.1, click on Progra m Manager.
5. Select FILE, and select RUN.
6. Type A:SETUP and press Enter.
If you are not familiar with the above commands, refer to the instructions that are
supplied with your version of Windows™.
SETTING THE DATA LOGGER
The OM-DLT recording interval or sampling rate is the time between each temperature measurement that is saved in the logger’s memory. This interval is set
from the PC interface program (supplied) or from the optional OM-DP3 Data
Plotter. This interval can be set from 5 seconds to 50 minutes. A user message
of up to 20 characters can also be stored in the OM-DLT. This message can be
used to identify a customer’s location or identify a particular logger for tracking
purposes. Use the example below to set a OM-DLT logger.
1. Plug the PC interface into the printer port of the computer being used to set
the OM-DLT. Plug the OM-DLT being set to the cable from the PC interface
cable.
2. Start the Data Logger program. If you are using Windows™98/95, click on
Start, click on Programs, click on Omegalog, click on OMEGALOG.
3. If you are using Windows™3.1, double-click on the window labeled Omega-
log, then double-click on the OMEGALOG icon.
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OM-DLT Temperature Data Logger
4. The program will open with a
blank window showing no text or
graph. On the toolbar located
along the top of the screen, click
on the Setting Data Logger
before recording button. This
will open a secondary window
Setting Data Logger.
5. If a user message is desired,
click in the User Information
field and add t he desired
message. Note that the last
message will be dis-played and
will remain until it is erased or
changed by the user.
6. To select the sampling rate click on
the down arrow in the Sampling
Rate box. This will open a dropdown menu wit h the recording
interval selections. Note that the
maximum recordin g times are
indicated in parentheses next to the
recording interval.
The recording intervals that
correspond to charts used by the OM-DP3 Data Plotter show the appropriate
chart selection ins tead of a maximum recording time.
7. Click on the desired sampling rate. You may need to use the up or down
arrows on the drop down menu to see more of the available recording intervals.
8. The time and date the logger is
set to will be the same time as
the PC clock. It is important to
make sure the time set in the PC
is correct. The PC time will be
displayed as the Current Date
and Time in the setting window.
Refer to the owner’s manual for
your computer to find instructions on setting the PC time if it is not correct.
9. When all of the settings for the OM-DLT are to your satisfaction, click on OK
to store the setting in the OM-DLT and to close the window.
10. The OM-DLT is now set and ready to begin a new recording. Disconnect the
OM-DLT from the PC interface.
11. You can now connect a different OM-DLT or exit the program. To exit the pro-
gram, click on the Exit button on the tool bar.
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OM-DLT Temperature Data Logger
TO START A RECORDING
Prior to starting a new recording be sure that the OM-DLT is set for the required
recording interval. You may also wish to add a descriptive message to identify
the location or other important user information. Refer to Setting the Data Log-
ger for specific instructions on selecting recording intervals and storing user
messages.
To begin a new recording slide the
access door closed. The LED ind i ca tor
will begin to flash for 10 seconds.
During this period the recording can be
canceled without losing the data
previ o usly re c orded. When the LED
indicator stops flashing, a new
recording has begun and any previous
data has been erased. The OM-DLT recording function can be “locked” on by
passing a Ty-Wrap™ or similar restriction through the logger-mounting opening.
This can be used to prevent accidental or intentional disruptions of a temperature recording.
The LED will flash every 5 seconds to indicate operation. A bright flash of the
LED is used to indicate the temperature has been sampled and recorded. A dim
flash is used to indicate the OM-DLT is operating properly and the temperature
has not been sampled or recorded. The LED indicator will continue to flash until
the user stops the recording or the memory ha s re a ch ed i ts maximum capacity
of 10,000 samples.
NOTE: If the battery is exhausted during a recording, the OM-DLT will automatically terminate the recording and save any temperature data recorded
up to that point. The LED will stop flashing and the OM-DLT will not allow a
new recording to be started until th e battery has been replaced. Recorded
data can be retrieved regardless of the co ndition of the battery.
TO STOP A TEMPERATURE RECORDING
Slide the access door open (If locked,
remove the restriction device first).
The LED indicator will stop flashing.
The recorded data can now be
retrieved using the supplied
Windows™ compatible software and
PC interface, or the temperature
recording can be plotted on a circular chart using the option a l OMEGA Data
Plotter.
NOTE: Do not close the door until a new recording is desired! It is important
to leave the door open until you want to start a new recording. Starting a new
recording will erase the previous recording. To prevent accidental erasing of
recordings, the access door of the OM-DLT can be “locked” open by passing a
Ty-Wrap™ or similar restriction through the lock opening. The temperature re-
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OM-DLT Temperature Data Logger
cording will remain in the OM-DLT until a new recording is started. The recordings may be retrieved as many times as required or the battery can be removed
with no effect on the stored data.
RETRIEVING TEMPERATURE RECORDINGS
1. Plug the PC interface into the printer port of the computer being used to set
the OM-DLT. Plug the OM-DLT being read to the cable from the PC interface.
2. Start the Data Logger program. If you are using Windows™98/95 click on
Start, click on Programs, click on Omegalog, click on OMEGALOG.
3. If you are using Windows™3.11 double-click on the window labeled
Omegalog, double-click on the OMEGALOG icon.
4. The program will open with a blank
window showing no text or graph.
On the toolbar located along the
top of the screen click on the
Download data from Data Logger
button. A Data Transfer window
will open. Connect the OM-DLT now if it is not already connected.
5. To the right of the “Connect”
message is a selection box, which
will allow you to select the
temperatu r e informatio n in
Celsius or Fahrenheit. Click on
the desired scale, °F or °C.
6. Click on OK. The program will begin to retrieve the recording. A status bar
along the top of the window will show the progress of information being retrieved.
7. When the information has been retrieved, the program will automatically dis-
play the recording in the current mode that has been selected. If you have
been using the text mode then the recording will be displayed in the text
mode. If you have been using the graph mode then the recording will be
displayed as an auto scaled graph.
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Example of Text Listing
OM-DLT Temperature Data Logger
VIEWING A RECORDING AS A GRAPH
1. When information is retrieved
or when a file is opened it will
automatically be displayed in
the most recently used mode.
To view a recording as a
graph select the graph option
in the Display Format box. The program will display the entire recording as
a plotted graph with the temperature on the vertical scale and the time on
the horizontal scale.
2. To zoom to a particular part of
the graph, place the mouse
cursor in a corner of an
imaginary box that will enclose
the area of interest.
3. Press and hold the left mouse
button and move the cursor in
a diagonal direction from the
original position of the cursor.
A dashed line forming a box
will be displayed. Move t he
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OM-DLT Temperature Data Logger
cursor until the box encloses the area of interest and release the left mouse
button.
4. The box will now be stationary on the screen. Move the mouse cursor so
that it is inside the box and click the left mouse button.
5. The enclosed area of the box will now be zoomed so that it fills the entire
window. This may be repeated if additional magnification on an area of the
graph is desired.
6. To return to the original graph with no auto scaling click on the Full Graph
button.
7. To scale the graph click on the
Auto Scale button. The graph will
automatically be readjusted to fill
the vertical axis of the screen.
8. The graph on the screen
may be printed at any time
by clicking on the Print
button. Note that the printout
will be what is displayed on
the screen when the button
is clicked.
9. A prompt window will open in the middle of
the screen. Click OK to print, or Cancel if you
change your mind.
VIEW A RECORDING AS TEXT
1. When a recording is retrieved, or when a saved re-
cording is opened, it is displayed in the most recently used mode. The recording can be viewed as
a text listing or a plotted graph.
2. To view a recording as text when a graph is on the screen click the Text
button located in the display box.
3. Use the Windows™ scroll bar on the right hand side of the screen to scroll
through the text information
4. To print the text information as text data click on the Print button. A window
will open in the middle of the screen. In the lower left of the window will be a
drop-down menu which will
allow you to select the number
of degrees the temperature has
to change before the new value
is printed. This feature will
prevent needless printing of the
temperature when no
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OM-DLT Temperature Data Logger
temperature change has occurred. If you wish to print all the recorded information, leave this value at zero.
When you have selected the amount of temperature change to print (if any) click on the OK button to start printing.
DATA LOGGER CALIBRATION
You can calibrate the OM-DLT data logger to make its reading match an external
reference or standard. Set the OM-DLT sampling rate long enough to allow the
logger to stabilize at the reference temperature and make a recording along with
an external reference in a controlled environment such as a temperature chamber.
The calibration routine will use the
second recording samp l e to mak e
the logger reading match with the
external reference. Click Tools on
the menu and click Ca librate Log-
ger. A calibratio n passwo rd windo w will
open. Type y our pas sword in the Current Password section. If you want to
have a new pas sword next time , you
can type a new passw ord in t he New Passwo rd secti on. Click the OK but ton whe n finis hed.
If this is the first time you are calibrating the OM-DLT, no password is needed. You can click
the OK button or press the Enter key to
continue. If you have typed a
password before and you don’t want
password protection for the
calibration function, you can input
None as the new password and this
will clear the password protection.
After you type the correct current
password and click OK, a calibration
window will open. You can click the
plus or minus button to make the
data logger reading match with the reference reading that you recorded at the
same time and same place with the OM-DLT. Click the OK button and the software will make a new data retrieval based on your new calibration setting. The
new calibration setting will be saved in the OM-DLT and apply to all future recordings.
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OM-DLT Temperature Data Logger
BATTERY REPLACEMENT
The OM-DLT Data Logger is supplied with a Lithium battery, which will have an
average life of 3 years. The actual life of the battery will depend on a variety of factors
such as the temperature the battery is used i n, the sampling rate of the logger, an d how
often the OM-DLT is used. Extreme temperatures will res ult in reduced battery life. If the
battery is exhausted during a recording, th e OM-DLT wil l automat ically termi nate the recording and save any data recorded up to that poi nt. The LED will stop flashing and
the OM-DLT will not allow a new recording to be started until the battery has
been replaced. Recorded data can be retrieved regardless of the condition of
the battery.
The OM-DLT Data Logger uses a TL-5276/W Lithium battery, OMEGA Part
#OM-DLT-BATT or equivalent. Substitution of a different battery can result in
reduced performance or permanent damage to this instrument.
To replace the OM-DLT’s battery follow the steps below:
1. Be sure the logger is not set in the recording position, by sliding the door
open. Any temperature information recorded up to this point will not be lost
and is automatically saved.
2. Remove the rear battery cover.
3. The battery is connected with a keyed connector, remove the connector
from the PC board.
4. Remove the battery from the logger and dispose of properly.
5. Line up the connector of the new battery and push onto the pins of the PC
board with a firm motion. Note that the connector will only fit when it is correctly oriented.
6. Place the battery in the battery compartment of the OM-DLT.
7. Replace the battery cover.
Once the battery has been replaced it will be necessary to reset the logger’s
internal clock. Refer to the section Setting the Data Logger for instruct ions on
how to do this.
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OM-DLT Temperature Data Logger
PRODUCT SPECIFICATIONS
Ambient Operating Temperat ure Ran ge -40°F to +150°F (-40°C to +65°C)
Storage Temperature -40°F to +170°F (-40°C to +76°C)
Time Accuracy +/- 100ppm @ 75°F
Relative Humidity Range 0 to 95% Non-Condensing
Temperature Resolution 0.1°F
Temperature Accuracy +/-2°F (+/-1°C)
Measurement Capacity 10,000 Data Samples
Size 2.5" x 3.6" x 1.1"
Weight 0.26 lbs.
Power Source 3.6 Volt Lithium Battery (Supplied)
Battery Life 3 Years Average Use
OM-DP3 DATA PLOTTER
The OM-DP3 is an optional accessory
instrument that allows the user to
retrieve data and program OM-DLT
data loggers in the field without the
need of a computer. Using the OMDP3 you can plot recorded inf ormation
from a data logger or change the
settings of a data logger prior to
making a new data recording. The
OM-DP3 can be operated from
batteries or from the supplied AC
adapter. The OM-DP3 uses a series of
structured menus to provide a user
friendly, intuitive style of operation.
The OM-DP3 also serves as a
conventional temperature recorder.
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