Onset HOBO U14 User manual

Onset Computer Corporation
Onset, HOBO, and HOBOware are trademarks or registered trademarks of Onset Computer Corporation for its data logger products and
configuration/interface software.
All other trademarks are the property of their respective companies.
Mailing Address:
P.O. Box 3450
Pocasset, MA 02559-3450
Phone: 1-800-LOGGERS (1-800-564-4377) or 508-759-9500
Fax: [phone]
Hours of Operation: 8 AM to 5 PM ET, Monday through Friday
E-mail: [e-mail]
Main Onset Web site: www.onsetcomp.com
If you purchased the products through an Onset Authorized Dealer, you can also refer to www.hobohelp.com for support information.
©2009 Onset Computer Corporation. All rights reserved.
Part #: MAN-U14
Doc #: 12033-C

Onset Computer Corporation
HOBO U14 1 User’s Guide
Contents
Chapter One:Overview of the HOBO U14 .........................................................................................2
Introduction............................................................................................................................................2
Features ................................................................................................................................................3
Components..........................................................................................................................................4
The LCD Screen....................................................................................................................................5
Chapter Two:Setting-Up the HOBO U14............................................................................................7
Procedure..............................................................................................................................................7
Configuring Alarms................................................................................................................................8
Reading Out the HOBO U14...............................................................................................................10
Chapter Three:Maintenance..................................................................................................................11
Replacing the Internal RH Sensor.......................................................................................................11
Replacing Batteries.............................................................................................................................11
Chapter Four:Reference ......................................................................................................................12
HOBO U14 Specifications...................................................................................................................12
Temperature Accuracy and Resolution...............................................................................................14
Internal Relative Humidity Accuracy ...................................................................................................14
LCD Indicators.....................................................................................................................................15
Chapter Five:Remote Alarm or Automatic Dialer.............................................................................17
Wiring Diagrams..................................................................................................................................18

Onset Computer Corporation
HOBO U14 2 User’s Guide
Chapter One: Overview of the HOBO U14
Introduction
The U family of data loggers offers reliability and convenient monitoring for applications that require higher accuracy, better resolution,
more memory, or USB connectivity for fast data readout to your computer.
The HOBO U14 logger records and displays temperature and humidity conditions in manufacturing, processing, and storage
environments where reliable monitoring and documentation of specific temp/RH conditions are critical.
The HOBO U14 is available in two versions:
•001 - Internal Sensors
•002 - External Sensors
Requirements
The HOBO U14 requires:
•HOBOware Pro or HOBOware Lite, Version 2.5 or later
Location Requirements
The HOBO U14 is designed for a non-condensing, non-corrosive environment. Keep the logger dry.
Some external sensors can be placed in harsher environments than the logger. See the external sensor specifications in the sensor user
manual.

Onset Computer Corporation
HOBO U14 3 User’s Guide
Features
The HOBO U14 has the following key features:
•64k non-volatile memory that retains data even if the batteries fail.
•Memory indicator on LCD shows how much data storage space remains.
•Battery Level indicator shows remaining useful battery life.
•Operates for one year on three alkaline AAA batteries in typical conditions.
•Built-in relay for use with Remote Alarm or Automatic Dialer.
•Direct USB interface for launching and data readout using HOBOware.
•Sample (logging) interval can be set from one second to 18 hours
•Supports Onset’s Data Assistants (available with HOBOware software)
•Can be used with the Onset U-Shuttle (U-DT-1)
•Internal Sensors (Model 001)
The Internal Sensor model has two internal sensors with 12-bit resolution:
-Temperature
-Relative Humidity
•External Sensors (Model 002)
The External Sensor model supports the following external sensors:
-12-bit Temperature/10-bit RH Sensor (S-THB-M00x)
-12-bit Temperature Sensor (S-TMB-M00x)
•Accessories
-Outdoor Case (CASE-4x)
-Remote Alarm (ARA)
-Automatic Dialer (AVD-45)

Onset Computer Corporation
HOBO U14 4 User’s Guide
Components
Front
LCD Screen
See LCD Indicators on page 15.
USB Port
Use an Onset-supplied USB interface cable to connect the HOBO U14 to a computer.
External Sensor Port (Model 002 Only)
Connect supported Smart Sensor here.
Back
Mounting Holes
Use mounting screws 2.5 cm (1 inch) apart to mount the U14 to a wall.
Battery Compartment
The HOBO U14 requires three AAA batteries. Onset Computer Corporation strongly recommends the use of fresh alkaline batteries.
Batteries should be replaced when the BATT LEVEL bar graph is down to one segment, which indicates 20% battery life or less.

Onset Computer Corporation
HOBO U14 5 User’s Guide
Circuit Board
Replaceable Internal RH Sensor (Model 001 Only)
The internal relative humidity sensor in the U14-001 may require replacement if it is damaged mechanically or by exposure to
condensation or chemicals. The replacement sensor (Onset part number HUM-RHPCB-3) is available from Onset or an Onset
Authorized Dealer.
See Replacing the Internal RH Sensor on page 11.
Relay Terminal
The HOBO U14 is compatible with Onset’s Remote Alarm (part number ARA) and Automatic Dialer (part number AVD-45) available
from Onset Computer or an Onset Authorized Dealer. See page 17.
The LCD Screen
After installing the batteries, the LCD will display all segments for five seconds. Thereafter, the LCD will display temperature and %
RH information. The values on the LCD screen refresh every 30 seconds.
Also See: LCD Indicators on page 15.

Onset Computer Corporation
HOBO U14 6 User’s Guide
Displayed Values
There may be slight variations between the displayed temperature value and the logged value due to limits in display conversions.
The values seen in HOBOware and the U-Shuttle are the actual recorded values and the most accurate. The displayed temperature on the
LCD screen may be ±0.3°C (±0.6°F) different than the logged value.
Fahrenheit values of 200° and higher are displayed as three digits without a decimal (e.g., 205°F); however, the full resolution value will
be recorded in the logger memory (e.g., 205.4).
Temperature Reading
•Displays the current temperature (Fahrenheit or Celsius) and RH on the LCD.
•Internal sensor has temperature measurement range of -20°C to +50°C
(-4°F to +122°F).
•The temperature unit displayed is determined by the settings in HOBOware (File > Preferences > Display > Default Unit System).
Relative Humidity (RH) Reading
•Internal sensor has a measurement range of 0% to 100%.
Alarm Icon
•ALERT indicator signals when temperature or relative humidity limits have been exceeded.
•ALERT DELAYED if you have delay enabled and an alarm is tripped.
•Triangle with exclamation mark immediately after delay (if enabled) indicates that the relay is in an alarm state.
Battery Level
Remaining battery level is indicated by a five-segment bar. The number of segments decreases as battery level decreases.
Batteries should be replaced when the BATT LEVEL bar graph is down to one segment, which indicates 20% battery life or less.
Remaining Memory
Remaining memory is indicated by a five-segment bar. The number of segments decreases as remaining memory decreases.
NOTE: If the memory is full, the logger will no longer log. The logger will continue to monitor conditions however, and will trigger an
alert if the reading falls outside of the configured range. You must readout the logger and then relaunch it using HOBOware to resume
logging.

Onset Computer Corporation
HOBO U14 7 User’s Guide
Chapter Two: Setting-Up the HOBO U14
Procedure
1. Install Batteries
a. Remove the battery door (back of unit).
b. Insert the three AAA batteries. Make sure the batteries are installed in the proper direction.
2. If you are using a Remote Alarm and/or Automatic Dialer, connect it to the HOBO U14 now (see page 17).
3. Replace the battery cover.
4. If you have an External Sensor model (002), plug the external sensor into the RJ-12 jack on the side of the HOBO U14. Hold the
black rubber flap down against the connector so it slides into the port.
NOTE: The sensor readings will not be displayed until the logger is launched (immediate or delayed) or the status is checked using
either HOBOware or the U-Shuttle. The readings will not be logged until you launch the logger later in this procedure.
5. Connect the U14 to a computer running HOBOware.
NOTE: The U-Family logger requires a USB interface cable to connect to the computer (supplied with HOBOware software).
a. Plug the large end of the USB interface cable into a USB port on the computer.
b. Plug the small end of the USB interface cable into the side of the HOBO U14.
If the logger has never been connected to the computer before, it may take a few seconds for the new hardware to be detected
(Windows only).
c. Run HOBOware.
d. From the Main Menu, select Launch.
6. Configure Launch Parameters. See the HOBOware User Manual or On-line Help for details on Launch parameters.
7. Configure Alarms (page 8).
8. Click on the Launch button to launch the HOBO U14.
NOTE: If you remove the external sensor (002 model) after logging starts, you will need to relaunch the logger if you reconnect a
sensor.
9. Disconnect the HOBO U14 from the computer by unplugging the USB cable.
10. Transport logger to deployment site.
11. Mount the HOBO U14.
The HOBO U14 is designed for a non-condensing, non-corrosive environment. Make sure the logger is installed in a location where
it will remain dry. Some of the external sensors can be placed in harsher environments (see the sensor manual for specifications).
a. Mark the wall for the placement of the two mounting screws 2.5 cm (1 inch) apart (vertically).
b. Screw in mounting screws, leaving a gap between the wall and the head of the screw of about 0.5 cm (3/16 in.).
c. Attach logger by aligning it with the screws, and then push in and down to lock in place.
12. If you have an External Sensor model (002), mount the External Sensors (see the sensor user manual).
In some applications (such as a refrigerator, freezer, clean room) it may be more convenient to permanently mount an external
sensor at the site. Be sure to place the remote sensor in a location that is representative of the target measurement location and
allows free flow of air (beware of any drafts caused by vents, doors, etc).
If you permanently mount the sensor and later have to disconnect it from the logger for readout, when you relaunch the logger select
Delayed Launch to allow time to reconnect the sensor before launch.
13. Read out the HOBO U14 (page 10)
When the memory is full, or anytime you want to view the data, read out the HOBO U14 using HOBOware.

Onset Computer Corporation
HOBO U14 8 User’s Guide
Configuring Alarms
Use the Alarm feature to flash a warning on the LCD if monitored temperature or relative humidity falls outside user-selectable limits.
If the temperature or RH measured by the logger falls outside the selected high or low limit, the word ‘Alert,’ an alert symbol, and the
temperature or RH measurement that went out of limits will flash.
If you require remote or secondary notification of an alarm condition, you can connect a remote audio alarm and/or an Automatic Dialer
to the contact closure (see page 17).
You access the Alarms window from the Launch window.
Alarm Window
Enable Sensor Alarms
To enable a sensor alarm, select the desired sensor in the Channel box, and then select the check box for the High Alarm and/or the Low
Alarm. Enter a value to define the alarm threshold. You can enter a value in the box or use the sliders. (If you enter values manually, the
software may adjust them slightly to the nearest values supported by the logger.)
You can also set the number of samples (30 seconds per sample) that must be displayed before the alarm will be triggered.
Samples
To avoid unintended activation of the relay contact, set the number of samples to allow for anticipated breaches of the alarm threshold.
If the alarm is tripped and the number of samples is set to more than 1, the LCD will indicate Alert Delayed. If the measurement is still
out of range when the number of samples is reached, the relay contact will be activated.
See Avoiding Unintended Relay Activation on page 9.