INTRODUCTION
Thank you for purchasing General Tools & Instruments’
HT 08
USB RH/Temperature/GPP Mini
Data Logger. Please read
this user’s manual carefully and thoroughly before using the
instrument.
The HT08 is a low-cost, compact, battery-powered thermo-
hygrometer capable of unattended logging (recording) of the
ambient temperature and relative humidity (RH) of an
environment for days, weeks or months. In addi
tion, soft
ware
included with the product can also calculate and display
absolute humidity levels in units of grains per pound (GPP) or
g/kg. Also called mixing ratio, GPP is a more useful moisture
metric than RH to water damage remediators. Using RH
alone, a remediator might unknowingly introduce moist air—
with a low RH but a high GPP—during a job’s drying phase.
Data logging can be started or stopped
by pushing
a button
on the unit, eliminating the need to bring a laptop to the job
site. After a data log has been captured and stored, it can be
uploaded as a .txt file to any PC running the Windows
®
7 or
Windows
®
XP operating system after plugging the HT08 into
one of the computer’s USB ports. The HT08’s internal flash
memory is large enough to store 16,300 pairs of RH and
temperature readings.
Included wit
h the prod
uct—which is slightly larger than a
thumb drive—is a mini-disc with the drivers needed to
interface the unit to the computer, as well as software that
can display a data log file as a table or graph and/or export it
to Microsoft Excel. Exporting to Excel is recommended for
sophisticated trending and analysis of humidity and
temperature data and easy detection of unexpected
excursions.
3
Windows
®
7 and Windows
®
XP are registered trademarks of Microsoft Corporation.
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