14
HOBO LCD Temp/RH User’s Manual
•
Temperature accuracy: ±0.7°C at +20°C (±1.3°F at +68°F), see plot B *
•
Temperature resolution: 0.4°C at +20°C (0.7°F at +68°F)
•
Temperature accuracy drift: <0.1°C (0.2°F) per year, typical
•
Temperature response time to 90%: 8 minutes typical in airflow of 2 m/s (4.5 mph)
Environmental
•
Operating RH range: 0% to 100% intermittent condensing environments up to +30°C
(+86°F) and non-condensing above +30°C (+86°F)
•
Operating temperature range: -40°C to +75°C (-40°F to +167°F)
* The H14-001 meets CE specification EN61326 criterion A for ESD and Immunity. The H14-
002 meets CE specification EN61326 criterion C for ESD and criterion B for Immunity. To
minimize measurement errors due to ambient RF, use the shortest possible probe cable
length and keep the probe cable as far as possible from other cables.
Service and Support
HOBO
®
products are easy to use and reliable. In the unlikely event that you have
a problem with this instrument, please read the following:
Who do I contact?
Contact the company that you bought the loggers from: Onset or an Onset
Authorized Dealer. Before calling, you can evaluate and often solve your problem
if you try the following:
1.
Write down the events that led to the problem. Are you doing anything
differently?
2.
Visit the Technical Support section of the Onset web site at
www.onsetcomp.com/support.html.
When contacting Onset, please indicate that you need Technical Support for the
HOBO LCD logger. Be prepared to:
•
Provide the product number and serial number for the HOBO LCD logger
and software version in question.
•
Completely describe the problem or question. The more information you
provide, the faster and more accurately we will be able to respond.
Onset Technical Support
Onset Computer Corporation
470 MacArthur Blvd., Bourne, MA 02532
Mailing: PO Box 3450, Pocasset, MA 02559-3450
Phone: 1-800-LOGGERS (1-800-564-4377) or 508-759-9500
Fax: 508-759-9100
E-mail: loggerhelp@onsetcomp.com
Internet: www.onsetcomp.com
Returning Products to Onset
Direct all warranty claims and repair requests to place of purchase. Before
returning a failed unit, you must obtain a Return Merchandise Authorization
(RMA) number from Onset. You must provide proof that you purchased the Onset
product(s) directly from Onset (purchase order number or Onset invoice number).
Onset will issue an RMA number that is valid for 30 days. You must ship the
HOBO LCD Temp/RH User’s Manual
3
Figure 3
Display when no RH sensor is
installed, but RH is still active in
software. Turning RH off in software
will maximize logger space.
Installing Batteries
To begin operation of the HOBO LCD logger, remove the battery door (back of
unit) and insert the three AAA batteries. Ensure the batteries are installed in the
proper direction, then replace the battery cover. After installing the batteries, the
LCD will display all characters for five seconds. Thereafter, the LCD will display
temperature and % RH information for 30 seconds (external probe model needs
probe installed). After this, the logger will go into battery conservation mode and
display only the battery level. The logger will awake from battery conservation
mode and display data when launched with the host software.
The HOBO LCD logger has nonvolatile EEPROM memory that retains data even
if the batteries fail. As an extra precaution, do not remove batteries while logger is
recording data.
Install External Probe
(external probe
model H14-002 only)
The H14-002 external data logger requires a
compatible external temperature/relative humidity
probe or temperature probe (see
External Probe
Specifications
on page 13). Plug the external
probe into the RJ-12 jack on the side of the HOBO
LCD logger. If an H14-002 logger is launched and
no external probe has been connected, the display
will show dashes “---” (Figure 1) and will log
false values (-69°C/-92°F for temperature and 0%
for RH).
Make sure the probe is installed before
logging begins, and do not remove the probe
once logging starts.
If a temperature-only probe is
connected, no RH value should be displayed
(Figure 2). A display of --% RH (Figure 3)
indicates that the humidity channel is active in the
software and should be turned off to maximize
memory space. Otherwise, the unit will record a 0%
RH value at every logging interval. 100% RH is
displayed if a temperature/RH sensor is connected
and is covered with condensation. The sensor will
not provide accurate readings until it has dried out.
In some applications, it may be more convenient to
permanently mount a remote probe at the site (e.g.,
refrigerator, freezer, clean room). Be sure to place
the remote probe’s 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). See
External Probe
Mounting Details
on page 11 for additional
mounting information.
Figure 1
H14-002 display when no external
sensor is connected. False values,
-69°C (-92°F)/0%RH will be logged
until a sensor is connected.
Figure 2
Display when external
temperature sensor is
installed, with no RH sensor
.
