Chapter 3: Using the HOBO U30 Station
HOBO U30 Remote Monitoring System User’s Guide
29
If this alarm is tripped:
Do this:
Sensor failure
Check to see if the sensor error is an
intermittent or persistent failure. For an
intermittent failure, relaunch the HOBO U30
Station to clear the error and monitor the data. If
the failure reoccurs, check the sensor for
problems. If the failure is persistent, the sensor
most likely will need to be replaced and the
HOBO U30 then releaunched and all system
alarms will need to be reset.
Low memory
Relaunch the HOBO U30 Station by selecting
Force Relaunch on Next Connection under
Launch Configuration in HOBOlink. Reset all
system alarms.
Low battery
There are several things you can do if the low
battery alarm is tripped.
Reduce the connection interval set in
Readout Configuration in HOBOlink.com.
Reduce the excitation current.
Check and, if necessary, clean the solar
panel. Make sure nothing is shading the
solar panel. Consider buying a larger solar
panel.
If the battery is more than two years old,
consider replacing the battery. Once the
new battery is installed, relaunch the
HOBO U30 Station and reset the system
alarms.
When an alarm is tripped, the Alarm LED on the HOBO U30 Station will
blink and the relay will either open or close depending on how it is
configured. (The default Relay Contact setting for the HOBO U30 Station is
normally open. You can only change this overall setting in HOBOware Pro,
which can also be used to test the relay. See page 36 for details.) Once the
alarm goes off, the HOBO U30 Station immediately attempts to connect to
HOBOlink.com regardless of the next regularly scheduled connection. It
generally takes two to four minutes to make a successful connection, at
which time the Alarm LED will shut off. The relay, however, will not switch
back until the alarm condition clears (if the HOBO U30 Station was
configured with HOBOlink to switch the relay back when the alarm clears).
Chapter 3: Using the HOBO U30 Station
30
HOBO U30 Remote Monitoring System User’s Guide
If the connection to HOBOlink is not successful, the HOBO U30 Station will
try to connect again in about 10 minutes, then again in 20 minutes,
continuing to double in time until it reaches six hours. It will then continue
to call every six hours until it makes a connection. For more information on
trouble connecting to HOBOlink, see page 52.
Checking status and data
Check the status of the HOBO U30 Station by logging onto HOBOlink.com.
For each device registered to your user account, you can see the following
details:
•
Latest sensor readings and battery level
•
Latest connections, including when the next connection is
scheduled
•
Current status of the device, for example “Logging, Relay
Deactivated (Open)”
•
Graphs for all sensors and the battery voltage
Working with HOBOware Pro
This section explains how to use the HOBO U30 Station with HOBOware
Pro, including:
•
Connecting to HOBOware Pro
•
Configuring the Analog Sensor Port
•
Changing the Relay Contact setting
•
Checking cellular signal strength
•
Viewing data files
