EXTECH RHT10

User's Guide
Humidity / Temperature Datalogger
Model RHT10
Introduction
Congratulations on your purchase of the Relative Humidity and Temperature Datalogger. This datalogger
measures and stores up to 16,000 relative humidity and 16,000 temperature readings over 0 to 100%RH and -40
to +70°C (-40 to +158°F) measurement ranges. The user can easily set up the logging rate, high/low alarm and
start-mode, and download the stored data by plugging the module into a PC's USB port and running the supplied
PC software. Relative Humidity, Temperature and Dew Point data can then be graphed, printed and exported to
other applications. The data logger is supplied with a long-life lithium battery, which can typically allow logging for
one year. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable
service
FEATURES
ƒ
Memory for 32,000 readings(16,000 temperature and 16,000 humidity readings)
ƒ
Dew point indication via Windows Software
ƒ
Selectable data sampling rate: 2s, 5s, 10s, 30s, 1m, 5m, 10m, 30m, 1hr, 2hr, 3hr, 6hr, 12hr, 24hr
ƒ
Status Indication via Red/Yellow LED and Green LED
ƒ
USB Interface for Set-up and Data Download
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User-Programmable Alarm Thresholds for Relative Humidity and Temperature
ƒ
Analysis software used to view graph
ƒ
Long battery life
DESCRIPTION
1. Protective cover
2. USB connector to PC port
3. Start button
4. RH and Temperature sensors
5. Alarm LED (red/yellow)
6. Record LED (green)
7. Mounting clip
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LED Status Guide
LED Status
Indication
Action
Both LED lights OFF
REC ALM
Start logging
Logging not active
Or
Low Battery
REC ALM
Replace battery and
download the data
One green flash every 10 sec. *
Logging active, no alarm condition**
Green double flash every 10 sec.
Delayed start
REC ALM
To start, hold the start
button until Green and
Yellow LED flash
Red single flash every 10 sec. *
Logging active, low alarm condition for RH***
Red double flash every 10 sec. *
Logging active, high alarm condition for RH***
REC ALM
Red single flash every 60 sec.
Low Battery****
Yellow single flash every 10 sec. *
Logging active, low alarm condition for TEMP***
If logging, logger will stop
automatically. No data will
be lost. Replace battery
Yellow double flash every 10 sec. *
Logging active, high alarm condition for TEMP***
Yellow single flash every 60 sec.
Download the data
Logger memory full
* To save power, the logger’s LED flashing-cycle can be changed to 20s or 30s via the supplied software.
** To save power, alarm LEDs for temperature and humidity can be disabled via the supplied software.
***When both temperature and relative humidity readings exceed alarm level synchronously, LED status indication
alternate every cycle.
****When the battery is low, all operations will be disabled automatically. NOTE: Logging automatically stops when
the battery weakens (logged data will be retained). The supplied software is required to restart logging and to
download logged data.
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Operation
DATALOGGER SOFTWARE INSTALLATION
Install the supplied Windows PC Datalogger Software by placing the supplied program disk in the PC CD-ROM
drive. If the installation program does not automatically open and provide on-screen prompts, double click the
SETUP.EXE file included on the program disk. Follow the on-screen prompts to complete the installation. Before
running the Datalogger software please connect the Logger to the PC and install the USB Driver software as
described in the next section.
CONNECTING THE LOGGER TO THE PC and INSTALLING THE DRIVER SOFTWARE
Plug the Logger into an available USB port on the PC. If this is the 1st time that the Logger is connected to the
particular port on the PC, the following screen will appear:
Select the ‘recommended’ installation (make sure the program disk is still in the PC CD-ROM drive) and follow the
on-screen prompts to complete the driver installation. If this is a repeat connect of the Logger to the USB port, the
driver installation process will be automatically skipped.
RUNNING THE DATALOGGER SOFTWARE
With the Logger connected to the PC, Double click the DATALOGGER icon to launch the program. The main
software screen will appear with the MENU BAR icons described below.
MENU BAR
From left to right the menu bar icons represent DATA DOWNLOAD, LOGGER SETUP, FILE OPEN, FILE
SAVE-AS, FILE PRINT, and ZOOM. In addition, the FILE, VIEW, LINK, and HELP pull-down menus are available
here. All will be discussed in the following paragraphs. Start by setting up the Logger as explained in the following
section.
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SETUP THE LOGGER
Click on the computer icon on the menu bar (2nd from left) or select LOGGER SET from the LINK pull-down menu.
The Setup window will appear as shown below; descriptions for each field in the Setup window are listed directly
below the illustration:
ƒ
The CURRENT TIME field will automatically synchronize with the PC date and time setting
ƒ
The MANUAL and INSTANT select buttons allow the user to start datalogging immediately when the Setup
window is exited (INSTANT) or at a later time (MANUAL). Explained in the LOGGING READINGS section
ƒ
The LOGGER NAME field allows the user to select a unique name for the logger
ƒ
The SAMPLE POINTS field instructs the logger to take a finite number of readings
ƒ
The SAMPLE RATE pull-down menu instructs the logger to log readings at a specific rate
ƒ
The LED Flash Cycle can be set by the user (the longer the time, the longer the battery life)
ƒ
The ALARM SETTINGS portion of the SETUP window allows the user to set HIGH and LOW temperature/RH
limits and disable the flashing of the Logger’s LEDs thereby conserving battery energy
Click on the SETUP button to save changes. Press the DEFAULT button to set the Logger to factory default
condition. Press the CANCEL button to abort the setup.
LOGGING READINGS
If INSTANT was selected in the SETUP window, the Logger begins logging at the instant the SETUP button is
pressed. If MANUAL was selected, the Logger must be manually started by pressing and holding the Logger’s
yellow button for approx. 3 seconds or until the two LEDs on the Logger flash at the same time.
Logging will continue at the programmed sample rate until the number of readings (sample points) specified in the
Setup window is reached.
The green LED flashes once per sample point and the red LED flashes when user programmed alarm limits are
exceeded. The yellow LED will flash at 10 second intervals AFTER the pre-determined number of readings has
been logged.
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DOWNLOAD SAVED DATA TO PC
To transfer the readings stored in the Logger to the PC:
1. Connect the Logger to the same USB port used when the Logger was initialized
2. Open the Datalogger software program if it is not still running
3. Click the Download icon (1st on the left) or select Data Download from the LINK pull-down menu
4. The Window shown below will appear. Press DOWNLOAD to begin transferring readings
If readings are successfully transferred, the VIEW screen and the SAVE screen (both shown below) will appear.
In the SAVE screen, name the file and save it to a convenient location. At a later time, the user can select
SAVE-AS and save the data as an Excel, Text, or Bitmap file (explained in next section), however, the data in this
case is saved as an .rec file for use in this program only.
In the VIEW screen (below) press VIEW to see the data graphically. If there are no readings currently stored in the
Logger, the program will let the user know via warning screen.
When VIEW is pressed, the Data Graph window appears (pictured and discussed in the next section)
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DATA GRAPH
The Data Graph window presents the transferred data in x-y graph format with Date/Time represented on the
horizontal axis and Temperature / %Relative Humidity / Dew Point / Alarm Limits represented on the y axis:
To zoom in and zoom out data regions, there are several approaches, these are:
1. Use the mouse to click and drag a box around any data area to magnify the area selected.
2. Click on the zoom magnifier icon tool on the menu bar
3. Select ZOOM OUT / ZOOM IN from the VIEW pull-down menu.
In the example graph above, the Temperature is represented by the solid red line (the lines are known as ‘traces’),
the Relative Humidity % by the solid yellow trace, and the Dew Point Temperature by the solid green trace. The
low and high alarm values for temperature are represented by the dashed red trace, the low and high alarm values
for Relative Humidity by the dashed yellow trace.
To customize the graph window select SHOW TRACES, BACKGROUND, GRID LINES, and MASK POINTS from
the VIEW pull-down menu. These options provide the following features:
SHOW TRACES: Allows the user to select which data to view as a trace (Temperature, RH, Dew Point, & Alarms).
BACKGROUND: Select background color scheme.
GRID LINES: Add or remove grid lines from x and y axes.
MASK POINTS: Places dots on the traces for the actual data points, breaking up the continuous nature of a trace.
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SAVE AND OPEN DATA FILES
To save the transferred data in a format other than the proprietary .rec format, click the SAVE AS icon from the
menu bar (3rd from right) or select SAVE AS from the FILE pull-down menu. The data can be saved in the
following formats:
TEXT FILE (.txt)
EXCEL FILE (.xls)
BITMAP FILE (.bmp)
To open an existing data file for viewing on the data graph window, click on the FILE OPEN icon on the menu bar
(3rd from left) or select FILE OPEN from the FILE pull-down menu. When prompted, select a .rec file saved earlier.
PRINT DATA GRAPH
To print a data graph window to a line or network printer, click on the printer icon or select PRINT from the FILE
pull-down menu. Note that color graph windows can be accurately printed on color printers.
CLEAR LOGGER DATA
The Logger retains data in its internal memory until the user begins a new logging session. Starting a new logging
session clears all of the logger’s stored readings; be sure to save data before starting a new logging session.
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Specifications
Overall Range
Relative Humidity
Accuracy (0 to 20 and 80 to 100%)
±5.0%
Accuracy (20 to 40 and 60 to 80%)
±3.5%
Accuracy (40 to 60%)
±3.0%
Overall Range
Temperature
Dew Point Temperature
0 to 100%
-40 to 158oF (-40 to 70oC)
Accuracy (-40 to -10 and +40 to +70oC)
±2oC
Accuracy (-10 to +40oC)
±1oC
Accuracy (-40 to +14 and 104 to 158oF)
±3.6oF
Accuracy (+14 to 104oF)
±1.8oF
Overall Range
Accuracy (25oC, 40 to 100%RH)
-40 to 158oF (-40 to 70oC)
±4.0oF (±2oC)
Logging rate
Selectable sampling interval: From 2 seconds up to 24 hours
Operating temperature
-31 to 176oF (-35 to 80oC)
Battery type
3.6V Lithium (1/2 AA) (SAFT LS14250, Tadiran TL-5101 or equivalent)
Battery life
1 year (typ.) depending on logging rate, ambient temperature, & use of Alarm LEDs
Dimensions/Weight
4x1x.9” (101x25x23mm) / 6oz (172g)
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Battery Replacement
It is highly recommended that the battery be replaced every 12 months, or prior to logging critical data.
The datalogger does not lose its stored readings when the battery weakens or when the battery is replaced; the
data logging process will however be stopped and cannot be re-started until the battery has been replaced and
the logged data has been downloaded to PC.
Use only 3.6V lithium batteries. Before replacing the battery, remove the datalogger from the PC. Follow
diagrammatic steps 1 through 4 below.
NOTE: Leaving the logger plugged into the PC USB port longer than necessary will cause some of the battery
capacity to be lost.
1
4
2
3
WARNING: Handle lithium batteries carefully, observe warnings on battery casing. Dispose of in accordance with
local regulations.
Sensor Reconditioning
Over time, the internal sensor may be compromised as a result of pollutants, chemical vapors, and other
environmental conditions which can lead to inaccurate readings. To recondition the internal sensor, please follow
the procedure below:
Bake the Logger at 80°C (176°F) at <5%RH for 36 hours followed by
20-30°C (70-90°F) at >74%RH for 48 hours (for re-hydration)
If permanent damage to the internal sensor is suspected, replace the Logger immediately to insure accurate
readings.
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Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and
workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If
it should become necessary to return the instrument for service during or beyond the warranty period, contact the
Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our website www.extech.com
for contact information. A Return Authorization (RA) number must be issued before any product is returned to
Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent
damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse,
improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification.
Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not
be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or
replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or
oral, is expressed or implied.
Support line (781) 890-7440
Technical support: Extension 200; E-mail: [email protected]
Repair & Returns: Extension 210; E-mail: [email protected]
Product specifications subject to change without notice
For the latest version of this User Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451
Copyright © 2007 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in any form.
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