3
Operation with the LI-7550 Analyzer Interface Unit
3-14 LI-7700 Open Path CH
4
Analyzer
About USB Devices
Many user-supplied industrial grade flash drives are compatible with the LI-7550, but
some devices with custom drivers or encryption may not work. The drive must be
formatted to support FAT or Linux ext3 file systems. FAT32 is recommended over
FAT16.
USB Storage Capacity
The LI-7550 includes a 4 GB USB flash drive. If you are logging all 20 variables at 10
Hz (samples/second), the 4 GB flash drive can log data for about 22 days before
becoming full. Table 3-2 shows approximately how long the LI-7700 can store data
before a 4 GB USB drive becomes full.
Table 3-2. Approximate number of days that the LI-7700 can record data before a 4 GB flash drive
becomes full.
Variables Logged Time to fill a 4 GB drive
All (including status and diagnostics ~22 days
All (including status but not diagnostics) ~27 days
CH
4
(mmol/m
3
), Temp., Pressure, Signal Strength,
Drop Rate, Status, and Aux. Inputs 1 to 4
~44 days
Important: We recommend that you only use an industrial rated USB flash drive.
Non-industrial rated flash drives can fail, causing you to lose data.
Note: Data logging will stop when the storage device has reached capacity, but will
automatically resume when a USB storage device is reattached, assuming it has storage
space available. Data logging also automatically starts when the instrument starts up,
following a power interruption for example. Storage devices that are being used for the
first time may be take about 60-90 seconds to initialize before data will be written to
the device.
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