Chapter 3: Understanding the logger
HOBO Energy Logger Pro User’s Guide 9
Modules and sensors
This topic gives some guidelines for working with modules and sensors.
Adding and removing modules and sensors
Whenever possible, it is best to add and remove modules and sensors between deployments – after stopping the
logger and reading out data, but before relaunching. However, circumstances may require that you add or remove a
module or sensor at some other time.
If you add a module or sensor while the logger is recording data, the module or sensor will be ignored. Logging will
continue normally for the other channels.
You may attach modules and sensors at the following times:
• Any time between deployments, when the logger is stopped.
• While you are configuring the launch parameters in HOBOware Pro. Click
Refresh to update the Logging
Duration
and see the new module or sensor added to the list of sensors.
• After you have launched the logger, but before logging has begun (i.e. when the logger is waiting for a
delayed or button start). Note that adding modules or sensors will cause the logging duration to be shorter
than the duration that was displayed in the Launch window.
If you remove a module or sensor while the logger is logging, the
Sensor Fail indicator will blink when the next
logging interval is reached, and the logger will record erroneous data for that channel. This is true even if you
immediately connect another sensor of the same type in the same port. If you want to change sensors – even sensors
of the same type – you must stop the logger, read it out, swap the sensors, and then relaunch.
Smart Sensors
The logger can work with a maximum total of Smart Sensor cable lengths up to 100 meters (328 feet), as measured
from the logger connection point to the electronics embedded in the individual cables. Optional Smart Sensor
extension cable lengths must also be included in the total.
This limitation applies to Smart Sensor cables only. The lengths of other cables, such as those connected to
FlexSmart modules, do not need to be included in this total.
Working with channels
The Energy Logger Pro can log up to 15 data channels (not including the internal battery channel). This includes all
FlexSmart module channels, plus each of the Smart Sensor channels (note that some Smart Sensors may have more
than one channel). If you have more than 15 channels connected, some of the sensors will be ignored. You should
remove any Smart Sensors that will not be used in the deployment, and disable any module channels that are not
needed.
• FlexSmart modules have two channels. If you want to log only one channel, you can disable the unused
channel on the Launch window in HOBOware Pro. Refer to the HOBOware Pro User’s Guide for details.
• If you connect a Smart Sensor that has multiple channels (such as temperature and relative humidity), all of
its channels will be logged. There is no way to disable them.
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