Hobo U24 Quick Manual

HOBO U24 Conductivity Logger
®
(Part # U24-001)
Inside this package:
• HOBO U24 Conductivity Logger (U24-001)
Manual Part #: MAN-U24
Doc#: 13681-B
Onset Computer Corporation
Description
The HOBO U24 Conductivity logger is ideal for
measuring and monitoring the impacts of pollutants such
as road salt, agricultural runoff, chemical spills, and salt
water intrusion on water supplies and aquatic ecosystems.
Conductivity is a measure of water's ability to conduct
electrical current, which is effected by pollutants,
especially those containing inorganic dissolved solids. The
purer the water is, the lower the conductivity. Continuous
monitoring of conductivity at multiple sites along a stream
or in a well will determine when and where spikes of high
conductivity occur, with the goal of identifying the sources
of contamination that caused the high conductivity.
Software
®
HOBOware Pro Version 3.0 or above
Communication
To connect the logger to a computer you can use:
•
Optic USB Base Station (BASE-U-4) with a
coupler (COUPLER2-C), or
•
HOBO Waterproof Shuttle (U-DTW-1) with a
coupler (COUPLER2-C)
To launch and read out the logger in the field you can use
one of these methods:
•
Laptop computer with Optic USB Base Station
(BASE-U-4) and a coupler (COUPLER2-C)
•
HOBO Waterproof Shuttle (U-DTW-1) and a
coupler (COUPLER2-C).
•
HOBO U-Shuttle (U-DT-1, Firmware Version
1.12m030 or later) with Optic USB Base Station
and coupler (COUPLER2-C).
The optical interface allows the logger to be offloaded
without breaking the integrity of the seals. The USB
compatibility allows for easy setup and fast downloads.
LED
A light (LED) in the communications window of the
logger confirms logger operation. The following table
explains when the logger blinks during logger operation:
When:
The logger is Blinks once every one to four
logging seconds (the shorter the logging
interval, the faster the light blinks).
Blinks when logging a sample.
The logger is Blinks once every eight seconds
awaiting a start until logging begins.
because it was
launched in "Start
At Interval" or
"Delayed Start"
mode
Sleep Mode
The logger consumes significantly more power when it is
"awake" and connected to a base station or shuttle. The
logger will go into a low-power (sleep) mode if there has
been no communication with your computer for 30
minutes. To wake up the logger, remove the logger from
the coupler, wait a moment, then re-insert the logger.
Sample and Event Logging
The logger can record two types of data: samples and
events. Samples are the sensor measurements recorded at
each logging interval. 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.
The logger stores 64K of data, and can record over 18,500
temperature and conductivity measurements.
The light: