General HT50 User Manual

USB

RH/TEMPERATURE/GPP

DATA LOGGER with

LCD & IRT

USER’S MANUAL

HT50

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

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

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 –4

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

Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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

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

Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 – 13

Installing/Replacing the Battery . . . . . . . . . . . . . . . . . 8

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

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

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . 14 – 19

Deploy the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Stop Logging and Import Logs . . . . . . . . . . . . . . . . . 15

Viewing, Printing and Exporting Data Logs. . . . 15 – 17

Using the IR Thermometer . . . . . . . . . . . . . . . . . . . . 17

Other Indications . . . . . . . . . . . . . . . . . . . . . . . 18 – 19

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 – 20

Maintenance Tips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . 21 – 22

Return for Repair Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

INTRODUCTION

Thank you for purchasing General Tools & Instruments’
HT50 USB RH/Temp/GPP Data Logger with LCD & IRT. Please
read this user’s manual carefully and thoroughly before using
the instrument.

2

The HT50 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. It can also measure
and optionally log surface temperatures spot-checked by a
technician using the unit’s integral infrared (IR) thermometer.
In addition, the HT50 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 restorers. Using RH alone, a
restorer 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
Windows

®

XP operating system after plugging the HT50 into

®

7 or

one of the computer’s USB ports. The HT50’s internal flash
memory is large enough to store 16,300 pairs of RH and
temperature readings or nearly 10,000 sets of RH, ambient
temperature and surface temperature readings.

Included with the product 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.

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

3

Applications for the HT50 include:

• Water damage restoration—Because the HT50 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 HT50 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 low-

humidity alarm function of the HT50 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: 16,300 pairs of RH and

temperature readings or nearly 10,000 sets of RH, ambient
temperature and surface temperature readings

• 3-1/2-digit LCD displays real-time temperature and RH

readings, absolute humidity readings—in grains per pound
(GPP) or g/kg—and device working and alarm status and
“memory full”

• Built-in IR thermometer with 2:1 Distance-to-Spot ratio and

measurement range of -4° to 482°F (-20° to 250°C)

• Included software is used to set: Sampling time from

10 seconds to 12 hours; Hi/Lo alarm setpoints for humidity,
ambient temperature and surface temperature;
Temperature unit (°F or °C)

4

• Software also calculates and plots GPP and dew point and

wet bulb temperatures and displays data logs as time­based graphs synchronized to your PC’s clock

• One-click exporting of logs to Excel or Word

• Long battery life (up to one year)

• Includes USB extension cable

• One-year warranty

SAFETY INSTRUCTIONS

CAUTION - Use of controls or adjustments or performance of
procedures other than those specified herein may result in
dangerous radiation exposure. The HT50’s targeting laser is a
Class 2 type that emits less than 1mW of power at a
wavelength of 655nm. Avoid direct eye contact with laser
light radiation. U.S. law prohibits pointing a laser beam at
aircraft; doing so is punishable by a fine of up to $10,000 and
imprisonment.

Do not use the HT50 in the presence of flammable or
explosive gases.

WHAT’S IN THE BLISTER PACK

The HT50 comes in a blister pack that also contains

• One “1/2 AA” battery. Replacement batteries
(Part No. BA10) are available from General.

• A disc with software drivers for Windows7 and Windows
XP computers, the ELusb V1.21.1 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)

5

PRODUCT OVERVIEW

Fig. 1a below shows the main components, controls and
connectors of the HT50. Fig. 1b (on the facing page) shows
all possible indications on the HT50’s display. Familiarize
yourself with their names and functions before moving on to
the Setup Instructions.

F

D

E

C

J

B
A

G

Fig. 1a.

H

I

The components, controls and connector of the HT50

A. IR sensor window
B. Laser pointer window
C. Battery compartment (opens from rear of unit)

3-1/2-digit LCD (displays real-time temperature, RH and GPP

D.

readings; also indicates device working status and “memory full”)
E. USB plug
F. Protective cap
G. SET and STO buttons (used to turn LCD on and switch

between GPP, temperature and RH readings and units; also
used to start/stop logging and check unit’s working status)

H. Meas button (when pressed and held, activates

IR thermometer and laser pointer)
I. Ambient temperature and humidity sensor window
J. Laser identification/certification/warning/safety labels

(see top of next page)

6

Fig. 1b. All possible

display indications

on the HT50

Display Legend

▲: indicates reading is

higher than high alarm setpoint for that parameter

▼: indicates reading is lower than low alarm setpoint for

that parameter

%RH: relative humidity unit

°C: Celsius temperature unit

°F: Fahrenheit temperature unit

IRT: Indicates operation in IRT mode

Hold: Indicates that IRT measurement is being held on the

display

GPP: Absolute humidity (mixing ratio) value in Imperial units

(grains per pound)
Absolute humidity (mixing ratio) value in metric units

g/kg:

: Low battery icon

[-]888.8: Humidity or temperature value or one of the following

four working status indications

LOG: Unit is logging data

- - -: Unit is in standby mode, ready to log data
FUL: Internal memory is full (and logging has been stopped)

CON: Unit needs to be configured by software

7

SETUP INSTRUCTIONS

INSTALLING/REPLACING THE BATTERY

The HT50 uses a 3.6VDC “1/2 AA” Lithium-ion battery.
To open the battery compartment, turn the unit over and
slide the battery compartment cover (which is clearly marked)
toward the front of the unit, in the direction opposite the
arrow on the cover. Remove the old battery and insert a fresh
battery in the correct orientation. Then replace the cover,
pushing it forward until you feel and hear a click.

After you replace the battery, the LCD will “wake up” and
begin displaying real-time readings. If the SET or STO button
is not pressed within 60 seconds, the LCD will be
automatically powered off.

Note: If the battery is removed from a unit before it has been
set up from software or while it is recording, the unit must be
reconfigured before it can be reactivated. If it is not
reconfigured, the unit will remain in standby mode.

INSTALL SOFTWARE AND DRIVERS

1. Place mini-disc in tray of CD/DVD drive, shiny side
down. Close tray.

2. When the AutoPlay window appears, click on
“Open folder to view files using Windows Explorer.”

3. Windows Explorer will indicate that there are two
“Files Currently on the Disc”. One is actually a folder
containing an electronic file of this user’s manual. Copy
the HT50 manual to your computer’s hard drive for
permanent storage. The other file is a Windows Installer
Package (.msi file) named “EL USB_V1.21.1.msi”.
Double-click its icon.

8