Extech RHT50 Operating Manual

User's Guide

Humidity + Temperature + Pressure
Datalogger

Model RHT50

Introduction

Congratulations on your purchase of the Relative Humidity / Temperature / Pressure Datalogger; this
datalogger measures and stores up to 10,000 readings. The user can easily configure the logging rate,
high/low alarm and start-mode. It also downloads the stored data by plugging the module into a PC
USB port and running the supplied PC software. Data can then be graphed, printed and exported to
other applications. The data logger is supplied with a 3.6V ½ ‘AA’ lithium battery. This meter is shipped
fully tested and calibrated and, with proper use, will provide years of reliable service.

Features

 Datalogger Memory stores 10,000 temperature, humidity and pressure readings

 Selectable data sampling rate: 1 second to 18 hours

 Manual and automatic datalogger start

 Status Indication via Red/Yellow LED and Green LED

 USB Interface for Set-up and Data Download

 User-Programmable Alarm Thresholds

 Long battery life

Description

1. USB connector

2. Alarm LED (red/yellow)

3. Record LED (green)

4. Start button

5. Battery cover latch

6. Tripod mount

7. RH, Temperature, Pressure sensors

8. Mounting bracket

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Operation

INSTALLING THE GRAPHING SOFTWARE

Install the supplied Windows
CD-ROM drive. If the installation program does not automatically open and provide on-screen prompts,
open and browse the CD-ROM drive, then find and double-click on the SETUP.EXE file included on the
program disk. Follow the on-screen prompts to complete the installation.

Before running the graphing software, please connect the RHT50 to the PC and install the USB Driver
software as described in the next section.

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PC Datalogger Software by placing the supplied program disk in the PC’s

INSTALLING THE USB DRIVER

Plug the RHT50 into an available USB port on the PC. If this is the first
connected to the particular port on the PC, the following screen will appear:

Make sure the program disk is still in the PC CD-ROM drive. Select the ‘recommended’ installation and
follow the on-screen prompts to complete the driver installation. If this is a repeat connection of the
RHT50 to the USB port, the driver installation process will be automatically skipped.

Refer to the HELP utility in the software program for detailed instructions on using the software to
download and process recorded data. The LED status guide provided below is offered for easy reference.

time that the RHT50 has been

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