User Manual

HOBO Pendant Temperature/Light Data Logger (UA-002-xx) Manual
1-800-LOGGERS 3 www.onsetcomp.com
5. Use the logger software to set up the alarms, launch, and
read out the logger.
You can read out the logger or check its status while it
continues to log, stop it manually with the software, or let it
record data until the memory is full. Refer to the software
user’s guide for complete details on launching, reading out, and
viewing data from the logger.
Important: Do not cover the optical communication window in
the logger (shown in diagram above) with a label or sticker as
that may interfere with the communications with the base
station or shuttle.
Triggered Start
This logger can be configured to start at your command, using
the magnet in the coupler to trigger a start.
1. Use HOBOware to launch the logger with Using Coupler
selected. Remove the logger from the coupler.
2. Bring the logger and an empty coupler or strong magnet to
the deployment location.
Important: Any magnet can trigger a start. This can be helpful,
but it can also cause a premature start. Keep the logger away
from strong magnetic fields until you are ready to begin
logging.
3. When you are ready for the logger to start logging, insert
the logger into the empty coupler (or place it next to a
strong magnet) and remove it after three seconds.
Important: The logger will not launch if the base station is in
the coupler.
4. Verify that the logger’s light is blinking at least every four
seconds.
Sample and Event Logging
The logger can record two types of data: samples and internal
logger events. Samples are the measurements recorded at each
logging interval (for example, temperature every minute). Events
are independent occurrences triggered by a logger activity, such
as Bad Battery or Host Connected. Events help you determine
what was happening while the logger was logging.
Operation
A light (LED) on the front of the logger confirms logger
operation. The following table explains when the light blinks
during logger operation.
When: The light:
The logger is logging Blinks once every one to four seconds
(the shorter the logging interval, the
faster the light blinks); blinks when
logging a sample
The logger is awaiting a start
because it was configured to
start logging At Interval, On
Date/Time, or Using Coupler
Blinks once every eight seconds until
logging begins
Light Measurement
The logger measures light intensity in units of lumens per
square foot (US) or lux (SI). The light sensor in the Pendant
logger measures a much broader spectrum of light wavelengths
than are visible to the human eye. Plot D shows that the
logger's response extends farther into ultraviolet and infrared
wavelengths than the eye's response. This means the logger is
useful for sensing wavelengths not visible to the eye, but it also
may mean that the logger's readings will not correspond
exactly to measurements made with a device having different
spectral sensitivity. The light sensor is most useful for
determining relative changes, rather than absolute values of
intensity.
The logger has a very wide dynamic range of light sensitivity
extending from complete darkness to somewhat beyond full
daylight. The resolution steps are smaller at low light levels
than at high light levels to allow useful measurements across
this broad range of intensities. Intensity readings are maximum
for light hitting the sensor directly on-axis and are reduced for
light coming in at an angle. Readings can also be reduced by
abrasions or dirt on the case above the light sensor.
Protecting the Logger
The logger can be damaged if the water depth rating is
exceeded. The depth rating is approximately 30 m (100 ft) at
temperatures below 20°C (68°F), but is less in warmer water.
Refer to Plot C for details.
Do not store the logger in the coupler. Remove the logger from
the coupler when you are not using it. When the logger is in the
coupler or near a magnet, it consumes more power and will
drain the battery prematurely.
Keep the logger away from magnets. Being near a magnet can
cause false coupler events to be logged. It can also launch the
logger prematurely if it was waiting for a trigger start.
Note! Static electricity may cause the logger to stop logging.
To avoid electrostatic discharge, transport the logger in an anti-
static bag, and ground yourself by touching an unpainted metal
surface before handling the logger. For more information,
search for “static discharge” in the FAQ section on
onsetcomp.com.
Periodically inspect the desiccant and dry it if it is not bright
blue. The desiccant pack is located in the cap of the logger. To
dry the desiccant, remove the desiccant pack from the cap and
leave the pack in a warm, dry location until the bright blue
color is restored. (Refer to the Battery section for instructions
on removing and replacing the logger cap.)
Temperature Range Desiccant Maintenance Schedule
Less than 30°C (86°F) Approximately once per year
30° to 40°C (86° to
104°F)
Approximately every six months
Over 40°C (104°F) Approximately every three months