OMEGA OM-141 User guide

User’s Guide

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e-mail: [email protected]

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SM

OM-141

USB RH/Temeprature/GPP

Mini Data Logger

omega.com [email protected]

Servicing North America:

U.S.A.: Omega Engineering, Inc., One Omega Drive, P.O. Box 4047

Stamford, CT 06907-0047 USA

Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: [phone] Fax: [phone]
e-mail: [email protected]

For Other Locations Visit omega.com/worldwide

The information contained in this document is believed to be correct, but OMEGA accepts no
liability for any errors it contains, and reserves the right to alter specifications without notice.

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 –4

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 –5

Safety Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

What’s in the Blister Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Product Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 –12

Installing/Replacing the Battery . . . . . . . . . . . . . . . . . 7

Install Software and Drivers. . . . . . . . . . . . . . . . . 7 –9

Configure the Unit . . . . . . . . . . . . . . . . . . . . . . . 9 –12

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . 13 –16

Deploy the Unit . . . . . . . . . . . . . . . . . . . . . . . . 13 –14

Stop Logging and Import Logs . . . . . . . . . . . . . . . . . 14

Viewing, Printing and Exporting Data Logs . . . . 14 –16

Other Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Maintenance Tips

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2

INTRODUCTION

Thank you for purchasing the OM-141 USB RH/Temperature/

GPP Mini Data Logger. Please read this user’s manual

carefully and thoroughly before unsing the instrument.
The OM-141 is a low-cost, compact, battery-powered thermo-

hygrometer capable of unattended logging (recording) of the
ambient temperature and relative humidity (RH) of an
environment for days, weeks or months. In addition, software
included with the product can also calculate and display
absolute humidity levels in units of grains per pound (GPP) or
g/kg. Also called mixing ratio, GPP is a more useful moisture
metric than RH to water damage remediators. Using RH
alone, a remediator might unknowingly introduce moist air—
with a low RH but a high GPP—during a job’s drying phase.

Data logging can be started or stopped by pushing a button
on the unit, eliminating the need to bring a laptop to the job
site. After a data log has been captured and stored, it can be
uploaded as a .txt file to any PC running the Windows
Windows

®

XP operating system after plugging the OM-141
into one of the computer’s USB ports. The OM-141’s internal
flash memory is large enough to store 16,300 pairs of RH and
temperature readings.

Included with the product—which is slightly larger than a
thumb drive—is a mini-disc with the drivers needed to
interface the unit to the computer, as well as software that
can display a data log file as a table or graph and/or export it
to Microsoft Excel. Exporting to Excel is recommended for
sophisticated trending and analysis of humidity and
temperature data and easy detection of unexpected
excursions.

®

7 or

Windows® 7 and Windows® XP are registered trademarks of Microsoft Corporation.

3

Applications for the OM-141 include:

Water damage remediation—Because the OM-141 is

designed to be deployed and left in place over the
duration of the job, it is always in equilibrium with the
environment.

Process control—The OM-141 enables, simplifies and cuts

the cost of environmental monitoring of office buildings,
greenhouses, food and equipment storage facilities,
wineries, freezers, shipping containers, HVAC/R
installations, computer rooms, labs, libraries, museums
and saunas.

Electronics manufacturing—Alerts provided by the low-

humidity alarm function of the OM-141 can mitigate the
risk of damaging high-voltage static discharges.

KEY FEATURES

One button starts/stops data logging without a PC
Plug-and-play USB 2.0 interface; no need for cables,

cradles or docks

Large storage capacity: 16,300 pairs of RH and

temperature readings

Two LEDs indicate device working status and

“memory full”

Included software is used to set: Sampling time from

10 seconds to 12 hours; Hi/Lo alarm setpoints for
humidity and temperature; Temperature unit (°F or °C)

Software also calculates and plots GPP and dew point and

wet bulb temperatures and displays data logs as time­based graphs synchronized to your PC’s clock

4

One-click exporting of logs to Excel
Long battery life (up to one year)
Includes USB extension cable
One-year warranty

SAFETY INSTRUCTION

Do not use the OM-141 in the presence of flammable or
explosive gases.

WHAT’S IN THE BLISTER PACK

The OM-141 comes in a blister pack that also contains

One “1/2 AA” battery. Replacement batteries

(Part no. OM-EL-BATT) are available from Omega

A disc with software drivers for Windows7 and Windows

XP computers, the ELusb V1.21.2 program for capturing
data logs and displaying them as curves, and a PDF of

this user’s manual
A USB extension cable
A hard copy of this user’s manual (inside the fold-over

card)

5

PRODUCT OVERVIEW

Fig. 1 shows the main components, controls, display and
connectors of the OM-141 Familiarize yourself with their names
and functions before moving on to the Setup Instructions.

A. Temperature and humidity sensor window
B. Battery compartment (latch is on rear of unit)
C. Two-color (green and red) LEDs (indicate device logging

and configuration status and “memory full”)
D. USB plug
E. Protective cap
F. MODE button

6

SETUP INSTRUCTIONS

INSTALLING/REPLACING THE BATTERY

The OM-141 uses a 3.6VDC “1/2 AA” Lithium-ion battery.
To open the battery compartment, use a paper clip or a
screwdriver with a fine point to push in the silver flange
showing through the small square hole in the rear of the unit
(left photo above). Push back the cover (middle photo).
remove the old battery (right photo) and insert a fresh battery
in the correct orientation. Then replace the cover, pushing it
forward until you feel and hear a click.

Whenever you change the battery, each of the two LEDs will
flash red once, and then green once.

Note: If the battery is removed from a unit before it has been
set up from software or while it is recording, the unit must be
reconfigured before it can be reactivated. If it is not
reconfigured, the unit will remain in standby mode.

INSTALL SOFTWARE AND DRIVERS

1. Place mini-disc in tray of CD/DVD drive, shiny side down.

Close tray.

2. When the AutoPlay window appears, click on “Open folder

to view files using Windows Explorer.”

3. Windows Explorer will indicate that there are two “Files Cur-

ently on the Disc”. One is actually a folder containing a PDF

of the OM-141 user’s manual (as well as PDFs of the manuals

for the OM-143 and OM-144, larger versions of the OM-141

7

with LCDs). Copy the OM-141 manual to your computer’s
hard drive for permanent storage. The other file is a Windows
Installer Package (.msi file) named “ELusb V1.21.2.msi”.
Double-click its icon.

4. A window titled “Welcome to ELUsb Installation Wizard”
will appear. Click Next to continue.

5. Within the Software License Agreement window that
appears next, click the I agree (T) box.

6. The next three windows advise that the ELusb application
will be installed in your computer’s C:\Program Files folders
in a new subfolder named <ELusb>, and that shortcuts to
the program will be created on your desktop and Quick
Launch bar. If you want to install the software elsewhere,
click Browse and choose another location. Within each
window, after selecting either the default location or
another location, click Next(N) to continue.

7. When the “Preparing to Install” window detailing the
changes to made appears, click Install (I) to continue.

8. Before the installation begins, a User Account Control
window may appear and ask, “Do you want to allow
[ELusb V1.21.2.msi] to make changes to this computer?”
Click Yes to continue.

9. The ELUsb Setup Wizard will now install the program on
your computer. On the next window that appears, click the
Completed (F) box.

10. At the bottom of the Device Driver Installation Wizard that
appears next, click Next to continue.

11. The next window to appear is a Windows Security
window. Click on “Install this driver software anyway” to
continue.

8

with LCDs). Copy the OM-141 manual to your computer’s
hard drive for permanent storage. The other file is a Windows
Installer Package (.msi file) named “ELusb V1.21.2.msi”.
Double-click its icon.

4. A window titled “Welcome to ELUsb Installation Wizard”

will appear. Click Next to continue.

5. Within the Software License Agreement window that

appears next, click the I agree (T) box.

6. The next three windows advise that the ELusb application

will be installed in your computer’s C:\Program Files folders
in a new subfolder named <ELusb>, and that shortcuts to
the program will be created on your desktop and Quick
Launch bar. If you want to install the software elsewhere,
click Browse and choose another location. Within each
window, after selecting either the default location or
another location, click Next(N) to continue.

7. When the “Preparing to Install” window detailing the

changes to made appears, click Install (I) to continue.

8. Before the installation begins, a User Account Control
window may appear and ask, “Do you want to allow
[ELusb V1.21.2.msi] to make changes to this computer?”
Click Yes to continue.

9. The ELUsb Setup Wizard will now install the program on
your computer. On the next window that appears, click the
Completed (F) box.

10. At the bottom of the Device Driver Installation Wizard that
appears next, click Next to continue.

11. The next window to appear is a Windows Security
window. Click on “Install this driver software anyway” to
continue.

8

12. The next Device Driver Installation Wizard window will
advise you that an OM-141/143/144 driver from Omega
or Kecheng Laboratories was successfully installed and
that your device is now “Ready to use.” Click Finish to
continue.

CONFIGURE THE UNIT

Note that the software installation has added a icon to
your desktop. To facilitate access to the program, right-click
on the icon and pin it to both your Start button and the Quick
Start area at the left of your taskbar. You can now eject the
installation mini-disc and store it with your other important
software.

Plug the OM-141 into an available USB port of your computer.

If your computer is a laptop and the only available USB
jack does not have enough vertical clearance to
accommodate the OM-141 without mechanically stressing
its USB plug, do not plug the OM-141 directly into the jack.
You do not want the plug of the OM-141 to support any of
the weight of the laptop. If that is the case, plug the OM-141

into the jack of the included USB extension cable and insert
the plug of the extension cable into the computer’s USB jack.

The first time you plug the OM-141 into your computer, your
system tray will notify you that the computer is “Installing
Device Driver Software”. When the notification disappears,
open the ELusb program by selecting it via your Start button,
clicking on its icon on your taskbar, or double-clicking its
desktop icon.

If the software has installed correctly and you have plugged
the OM-141 into a working USB port of your computer, the
following screen should appear on your computer’s display.

9

Device OM-141 is connected!

Fig. 2. The three options made available by

plugging the OM-141 into a USB port

Note: If you have already used your OM-141 to log data
and it is still in recording mode, plugging the unit in
will cause the following window to appear.

Click Yes to stop recording and import all data recorded to
that point in time. Click No to continue to Setup without
importing recorded data (meaning it will be lost). Click
Cancel to go back and unplug the unit from the USB port.

10

You can now use the software to “configure” your OM-141.
Configuring the device means choosing four key parameters:

Sampling time—How often it makes and stores

humidity and temperature measurements.

Temperature unit—degrees Fahrenheit or Celsius

(°F or °C).
High and low temperature alarm setpoints
High and low humidity alarm setpoints

To begin, click on “Set up the USB Data Logger” in the
window shown in the figure above. Doing so will cause the
following window to appear.

Device HT08 is connected!

Fig. 3. The OM-141 configuration (Setup) window

Using your mouse, trackball or touchpad, first choose your
Temp Scale and Sample Rate (sampling time). With regard to
sampling time, using the shortest setting of 10 seconds may

11

result in too much essentially identical data being stored in
memory, potentially limiting its capacity to capture important
events such as an unexpected excursion of temperature or
humidity. Conversely, using the longest sampling time setting
of 12 hours will likely cause important events to go
undetected.

If you are an experienced data logger, you already know how
to choose the optimum sampling time for your application. If
you are a novice, pick a sampling time closer to the minimum
sampling time than the maximum, on the assumption that the
OM-141 probably has enough memory (16,300 pairs of RH an
temperature readings) to store all the data you ask the meter
to log—unless you use it to log data for months, rather than
weeks or days.

Be aware that if you do manage to fill up the OM-141’s memory
(by logging for a very long time at a very short sampling time,
for example), the device will simply stop recording. It will not
continue recording by overwriting the oldest saved data with
new data.

If you wish, you can also drag the sliders shown in the figur
to set high and low alarm setpoints for temperature and
humidity.

Once you have chosen your data logging parameters, click
Setup. A window will appear advising that “The device is set up
successfully.” Clicking Setup also synchronizes the OM-141’s
internal clock with your computer’s clock, giving all data logs
to be captured an absolute time reference.

You can now unplug the OM-141 from your computer’s USB
port. The unit is in “standby mode, ready to begin logging data.

12

OPERATING INSTRUCTIONS

DEPLOY THE UNIT

The OM-141 is particularly easy to deploy on a job site because
the unit does not need to be plugged into a computer to be
activated (ready to start logging data). Working together, the
MODE button and the pair of two-color LEDs (Fig. 1, Callouts
F and C) serve as the control and indicators needed to: 1)
start and stop data logging and 2) verify and change the unit’s
working status.

That leaves only two things to be sure of when choosing a
place to deploy the OM-141:

The temperature and humidity sensor window

(Fig. 1, Callout A) is not covered
The humidity and temperature values at the unit’s

location are “representative” of the room

The OM-141 —with its protective cap on—can be deployed
either by laying it on a horizontal surface or by hanging it
vertically within the included plastic mounting bracket. The
back of the bracket features both a magnet and a hanger
hole.

Once you have deployed the OM-141, you can initiate data
logging. To start data logging, press and hold the MODE
button for at least 3 seconds. Both LEDs will flash green

twice to confirm that logging has begun.

STOP LOGGING AND IMPORT LOGS

To stop data logging, press and hold the MODE button for at
least 3 seconds. Both LEDs will flash red 2 or 3 times to

confirm that logging has stopped.

13

That is how you should stop data logging if you plan to initiate
another logging session later without uploading logged data
to your computer in the interim. If you allow logging to
continue and you do not upload your data to your computer
soon, you risk filling up the OM-141’s memory.

A simpler and safer way to stop data logging is to plug the
OM-141 into your computer’s USB port immediately after
completing a logging session and then use the ELUSB
software to stop logging.

Each time you plug the OM-141 into the USB port, the window
shown in Fig. 2 will appear. When you plug in the unit, it
makes no difference whether it is still logging; the procedure
for uploading (importing) data logs is identical. Just click on
the middle selection—Stop the USB Data Logger and
download data—to instantly execute both functions. The
data will be imported as a .txt file. A “Save As” window will
appear, asking you to identify where you want the file to be
stored and what you want to name it.

VIEWING, PRINTING AND EXPORTING
DATA LOGS

Immediately after you close the “Save As” window by
clicking on Save, the uploaded data log will automatically be
displayed as a set of curves representing all loggable values.
Fig. 4 is a typical example. The initial display includes all
parameters, including dew point and GPP or g/kg (which the
software automatically calculates) and alarm setpoints that you
may have entered during Setup. To remove any parameter or
horizontal and vertical grid lines from the overall plot, uncheck
its box at right.

14

Fig. 4. A typical initial plot of an imported data log

There are several features shown in Fig. 4 worth noting:

To mark the position of every recorded data point on the

curve, check the “Mark Points” box at the top of the sidebar
at right.

To get a higher-resolution view of the data recorded during

a specific period of time, scale up and down the curves by
dragging the slider at the bottom of the window to the left
and right.

Hovering the cursor over a particular point of the curve

displays all data related to this point—including the
maximum, minimum and average values of the entire
curve—in a shaded box at upper left.

The dates and times shown on the x-axis scale and in the

upper left corner are in sync with your computer’s clock.

To print the .txt file of any data log, click the Print virtual

button.

15

To open a previously saved data log, click the Open

button. This function is also available as the “View

previously saved data” option shown in Fig. 2.
To export a file to Excel for advanced trending and

analysis, click the Export to Excel button.

OTHER INDICATIONS

As mentioned earlier, the MODE button and the pair of two­color LEDs work together to indicate the current working
status of the OM-141. For example, the MODE button can be
used to confirm whether or not the unit has been configured
(activated) using the software’s Setup window (see Fig. 3):

If the unit is ready to log data, a quick press of the

MODE button will cause both LEDs to flash green once.

If the OM-141 needs to be configured, the two LEDs

will alternately flash red and green twice.

If a quick press of the MODE button causes both LEDs to
flash red once, logging has been stopped because the
memory is full.

During data logging, the pair of two-color LEDs will flash
green or red to indicate whether measured humidity an
temperature values are within or outside the band between
the preset low and high alarms:

The LEDs will alternately flash green one time each if

the values of both parameters have not exceeded their

setpoints.
The LEDs will alternately flash red one time each if the

value of either parameters has exceeded its setpoints.

16

SPECIFICATIONS

Temperature Measurement Range -4° to 158°F (-20° to 70°C)

Temperature Measurement Accuracy ±1.8°F (1°C) from 14° to

104°F (-10° to 40°C);
±3.6°F (2°C) elsewhere
in range

Temperature Measurement ±0.2°F (0.1°C)
Resolution and Repeatability

Relative Humidity (RH) 0 to 100%
Measurement Range

RH Measurement Accuracy ±3% from 20 to 80%RH,

±3.5% elsewhere

RH Measurement Resolution ±0.1%
and Repeatability

Internal Storage Capacity 16,300 pairs of RH/Temp

readings

Temperature Response Time 5-30 seconds

Humidity Response Time 8 seconds

Interface USB 1.0/2.0

Length of USB Extension Cable 7.9 in. (200mm)

Dimensions 3.74 x 1.11 x 1.22in.

(95 × 28 × 31mm)

Weight ~1.41 oz. (40g) without battery

Power Source 3.6V non-rechargeable

(1/2 AA) 1200mAh
Lithium-ion battery

Current Consumption <0.5mA

Battery Life (typical) 1 year

17

MAINTENANCE TIPS

Avoid dropping the unit. Do not subject it to violent shock

or vibration or expose it to strong electromagnetic fields

(for example, near arc welders or induction heaters).
Keep the unit out of direct sunlight.
Do not use chemicals or abrasive cloth to clean the

display window or housing.
Before storing the OM-141 for an extended period of time

(several months or more), remove the battery to avoid

having it leak and damage the unit.

18

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and
workmanship for a period of 13 months from date of purchase. OMEGA’s Warranty adds
an additional one (1) month grace period to the normal one (1) year product warranty to
cover handling and shipping time. This ensures that OMEGA’s customers receive maximum
coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer
Service Department will issue an Authorized Return (AR) number immediately upon phone
or written request. Upon examination by OMEGA, if the unit is found to be defective, it
will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects
resulting from any action of the purchaser, including but not limited to mishandling,
improper interfacing, operation outside of design limits, improper repair, or unauthorized
modification. This WARRANTY is VOID if the unit shows evidence of having been tampered
with or shows evidence of having been damaged as a result of excessive corrosion; or
current, heat, moisture or vibration; improper specification; misapplication; misuse or
other operating conditions outside of OMEGA’s control. Components in which wear is not
warranted, include but are not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products.
However, OMEGA neither assumes responsibility for any omissions or errors
nor assumes liability for any damages that result from the use of its products
in accordance with information provided by OMEGA, either verbal or written.
OMEGA warrants only that the parts manufactured by the company will be as
specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED,
EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY
WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser
set forth herein are exclusive, and the total liability of OMEGA with respect to
this order, whether based on contract, warranty, negligence, indemnification,
strict liability or otherwise, shall not exceed the purchase price of the component
upon which liability is based. In no event shall OMEGA be liable for consequential,
incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used:
(1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation
or activity; or (2) in medical applications or used on humans. Should any Product(s) be
used in or with any nuclear installation or activity, medical application, used on humans, or
misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY/
DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and hold
OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner.

WARRANTY/ DISCLAIMER

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN
AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT
(IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be
marked on the outside of the return package and on any correspondence. The purchaser is
responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in
transit.

FOR WARRANTY RETURNS, please have
the following information available BEFORE
contacting OMEGA:

1. Purchase Order number under which the
product was PURCHASED,

2. Model and serial number of the product
under warranty, and

3. Repair instructions and/or specific
problems relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement
is possible. This affords our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2016 OMEGA ENGINEERING, INC. All rights reserved. This document may not
be copied, photocopied, reproduced, translated, or reduced to any electronic medium or
machine-readable form, in whole or in part, without the prior written consent of OMEGA
ENGINEERING, INC.

RETURN REQUESTS/ INQUIRIES

FOR NON-WARRANTY REPAIRS,
OMEGA for current repair charges. Have
the following information available BEFORE
contacting OMEGA:

1. Purchase Order number to cover the COST
of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems

relative to the product.

consult

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA…Of Course!

Shop online at omega.com

SM

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