English User's Manual

User's Guide
Humidity & Temperature Datalogger
Model RHT20
Introduction
Congratulations on your purchase of this Temperature and Humidity datalogger. With this meter,
you can monitor and log data over long periods of time and then easily transfer the data to a pc for
viewing and evaluation. The LCD display provides current or Max/Min temperature, humidity and
time information. This meter is shipped fully tested and calibrated and, with proper use, will
provide years of reliable service.
Description
1
Record LED
2
Alarm LED
3
LCD Display
4
Temperature – Humidity display selection
5
MAX/MIN display selection
6
Battery Compartment (rear)
7
Temperature and Humidity sensors
8
USB PC port (bottom)
1
2
3
4
5
6
7
8
Display Description
DATE:
TIME:
MAX:
MIN:
REC:
FULL:
%RH:
°C:
°F:
Full battery symbol.
Weak battery symbol. Replace battery when this
appears. Battery life is more than 3 months.
Current date is displayed
Current time is displayed
Time and Date automatically swap every 10 sec.
Maximum value during a datalogging session is
displayed
Minimum value during a datalogging session is
displayed
Recording in progress indicator
Memory is full indicator
Humidity value is displayed
Celsius temperature units
Fahrenheit temperature units
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Operation:
The display and front panel buttons provide a means to view the status of the datalogger, observe
the current Temperature or Relative Humidity and to view the MAX and MIN values recorded during
a recording session. The datalogger setup conditions such as sample rate, temperature units and
alarm values are programmed via the provided software. Refer to the software Help File on the disk
for those procedures.
1. Press the MAX/MIN button to view the recorded Max and Min values with the time they were
recorded. If, while in this mode, no button is pressed for 40 seconds the display will
automatically return to the real time display.
2. The Time and Date display will automatically toggle every 10 seconds
3. When downloading the data to the PC, “-PC-” will be displayed on the LCD. After the download
is complete, the datalogger will display the last value recorded, but it will stop recording. The
logger needs to be re-set from the software to begin a new recording session.
4. The “REC” LED will flash at the programmed rate when the unit is datalogging.
5. Alarm function: When the measured value exceeds the programmed upper or lower limit and
the LED function is selected in the software, the ALM LED will flash one time per minute.
6. If “-LO-“ is displayed, the temperature and humidity sensors need attention.
7. The datalogger should be placed upright when in use.
8. If used in low temperature, high humidity environment, the datalogger should be placed upright
in a dry area to remove any condensation before downloading the data.
9. Battery life can be extended by leaving the datalogger connected to a pc.
10. Disabling the REC and ALM LED’s will extend battery life.
11. The LCD display will stop functioning at very low temperatures and will become active again
when the unit is returned to higher temperatures.
NOTE: The logger needs to be re-set from the software to begin a new recording session.
Combination Lock
The logger is supplied with a wall mount case and security combination lock. The
lock is shipped with a -0-0-0- code as viewed from the side with the alignment bar.
To change the code:
1
Press the release to open the lock (1)
2
Using a pointed object, press IN and HOLD the locking pin on the bottom of
the lock (2).
3
Set the new code (3) and release the locking pin
1
3
0
0
0
3
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Software Installation
1.
2.
3.
Place the CD in the drive and then follow the on-screen installation instruction.
After the software is installed, keep the CD in the drive and connect the datalogger to the PC
by the USB cable.
A USB Driver installation window will pop-up; follow the directions to install the driver.
Software application
The Datalogger USB software is a program for collecting data from the DATA LOGGER when it is
connected to a PC or notebook computer. The data may be displayed graphically, as Excel or
similar programs. The major functions are all listed in the main window.
System Requirements
Check the software download page of the extech.com website for the latest version of the PC
software and its operating system compatibility.
Minimum Hardware Requirements:
PC or NoteBook with Pentium 90MHz or higher, 32 MB RAM;
At least 7 MB byte hard disk space available to install HT Datalogger USB software
Recommended display resolution 1024 x 768 with High Color (16 bit)
Software Operation
The Software operation is described in the HELP file.
Battery disposal
You, as the end user, are legally bound (EU Battery ordinance) to return all used
batteries, disposal in the household garbage is prohibited! You can hand over your
used batteries / accumulators at collection points in your community or wherever batteries
/ accumulators are sold!
Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the
end of its lifecycle
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Specifications
Display
Measurement ranges
Resolution
Maximum data points
Sample rate
Analysis software
Open input indication
Low battery indication
Power supply
Battery life
Operating Temperature
Operating Humidity
LCD Operating Temperature
Dimensions
Weight
Relative Humidity
Temperature
Multi-function LCD
0 to 100% RH
-40 to 158°F, -40 to 70°C
0.1°, 0.1RH
16,350 Temperature and 16,350 Humidity values
1s to 24h selectable
Check the software download page of the extech.com website for
the latest version of the PC software and its operating system
compatibility.
"LO" appears on the LCD
Empty battery symbol appears on the LCD
3.6V Lithium Battery
3 months (approximately)
-40 to 158°F, -40 to 70°C
0 to 100% RH
-13°F to 158°F (-25°C to 70°C)
3.7x1.9x1.2") (94.4x48.9x31.2mm)
3.2oz (90.7g)
Range
Accuracy
0 to 20% and 80 to 100%
±5.0%
20 to 40% and 60 to 80%
±3.5%
40 to 60%
±3.0%
14 to 104°F
±1.8°F
-13 to 14°F and 104 to 158°F
±3.6°F
-40 to -13F
±8°F typical
-10 to 40°C
±1°C
-25 to -10°C and 40 to 70°C
±2°C
-40 to -25C
±4°C typical
Copyright © 2013 FLIR Systems, Inc. All rights reserved including the right of reproduction in whole or in part in any form www.extech.com 5
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