General Tools HT20 User Manual

HT20 - Manual–FINAL_REV_0316121_awb 3/16/12 4:02 PM Page 1

USB RH/TEMPERATURE

DATA LOGGER with

LCD DISPLAY

USER’S MANUAL

HT20

Please read this manual carefully and thoroughly before using this product.

HT20 - Manual–FINAL_REV_0316121_awb 3/16/12 4:02 PM Page 2

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 –4

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 –5

Safety Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

What’s in the Blister Pack. . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Product Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 –7

Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 – 12

Installing/Replacing the Battery . . . . . . . . . . . . . . 7 –8

Install Software and Drivers. . . . . . . . . . . . . . . . . 8 –9

Configure the Unit . . . . . . . . . . . . . . . . . . . . . . 10 – 13

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . 13 – 17

Deploy the Unit . . . . . . . . . . . . . . . . . . . . . . . . 13 – 14

Stop Logging and Import Logs . . . . . . . . . . . . . 14 – 15

Viewing, Printing and Exporting Data Logs . . . . 15 – 16

Other Indications . . . . . . . . . . . . . . . . . . . . . . . 16 – 17

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Maintenance Tips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Return for Repair Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

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INTRODUCTION

Thank you for purchasing General Tools & Instruments’
HT20 USB RH/Temperature Data Logger with LCD Display.
Please read this user’s manual carefully and thoroughly
before using the instrument.

The HT20 is a low-cost, compact, battery-powered thermo­hygrometer capable of unattended logging (recording) of the
ambient temperature and relative humidity (RH) of an
environment for days, weeks or months. 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

®

Windows

XP operating system after plugging the HT20 into
one of the computer’s USB ports. The HT20’s internal flash
memory is large enough to store up to 8000 pairs of humidity
and temperature readings.

Included with the product—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.

®

7 or

Windows®7 and Windows®XP are registered trademarks of Microsoft Corporation.

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Applications for the HT20 include:

• Water damage restoration—Because the HT20 is
designed to be deployed and left in place over the
duration of the job, it is always in equilibrium with the
environment.

• Process control—The HT20 enables, simplifies and cuts
the cost of environmental monitoring of office buildings,
greenhouses, food and equipment storage facilities,
wineries, freezers, shipping containers, HVAC/R
installations, computer rooms, labs, libraries, museums
and saunas.

• Electronics manufacturing—Alerts provided by the low­humidity alarm function of the HT20 can mitigate the risk
of damaging high-voltage static discharges.

KEY FEATURES

• One button starts/stops data logging without a PC

• Plug-and-play USB 2.0 interface; no need for cables,
cradles or docks

• Large storage capacity: Up to 8000 pairs of humidity and
temperature readings

• 3-1/2-digit LCD displays real-time temperature and
humidity readings; also indicates device working status
and “memory full”

• Included software is used to set: Sampling time from
10 seconds to 12 hours; Hi/Lo alarm setpoints for
humidity and temperature; Temperature unit (°F or °C)

• Software also calculates dew point and displays data logs
as time-based graphs synchronized to your PC’s clock

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• One-click exporting of logs to Excel or Word

• Long battery life (up to one year)

• Includes USB extension cable

• One-year warranty

SAFETY INSTRUCTION

Do not use the HT20 in the presence of flammable or
explosive gases.

WHAT’S IN THE BLISTER PACK

The HT20 comes in a blister pack that also contains

• One “1/2 AA” battery

• A disc with software drivers for Windows7 or Windows
XP computers, a program for capturing data logs and
displaying them as curves, and a PDF of this user’s
manual

• A USB extension cable

• A hard copy of this user’s manual (inside the fold-over
card)

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PRODUCT OVERVIEW

Fig. 1a below shows the main components, controls and
connectors of the HT20. Fig. 1b (on the facing page) shows
all possible indications on the HT20’s display. Familiarize
yourself with their names and functions before moving on to
the Setup Instructions.

E

F

D

,

Fig. 1a. The components, controls and connector

C

B

of the HT20

A. Temperature and humidity sensor window
B. Battery compartment (latch is on rear of unit)
C. 3-1/2-digit LCD (displays temperature and humidity

readings; also indicates device working status and

“memory full”)
D. USB plug
E. Protective cap
F. MODE button

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A