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, and download the stored data by plugging the module into a PC's 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 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
Memory 10,000 temperature, humidity and pressure readings
Selectable data sampling rate: 1 minute to 18 hours
Manual and automatic 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
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.
TM
PC Datalogger Software by placing the supplied program disk in the PC’s CD-ROM
INSTALLING THE USB DRIVER
Plug the RHT50 into an available USB port on the PC. If this is the first
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 connected to
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LED STATUS GUIDE
LEDs
Record Alarm
Green
Red
Yellow
• * Connect the datalogger to the PC and download data
• ** Replace the battery, data will not be lost
• *** Logging will stop, data will remain in memory
• **** Occurs if an alarm is exceeded
• ***** Flash cycle time is set from the software
No LED Logging not started
No LED Logging stopped *
No LED Battery discharged **
Green flash (single): Logging indication *****
Green flashes (five) Reset
Green flashes (six) Start Logging
Red double flash every 30 sec. Low battery ***
Red single flash Logging, alarm event ****
Red flashes (six) Stop logging *
Yellow flash every 20 seconds Memory full *
Meaning
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Specifications
Relative Humidity
Temperature
Pressure
Resolution
Data storage
Range Accuracy
0 to 20 and 80 to 100% ±5.0%
20 to 80% ±3.5%
-40 to 32oF and 104oF to 158oF
-40 to 0
32
o
C and +40 to +70oC
o
F to104oF/0oC to +40oC ±1.8oF/±1oC
±3.6
o
F/±2oC
950 to 1050hPa Accuracy: ±0.25%FSO @ (25oC)
Repeatability: ±0.25%Max+±0.3%FSO)
Linearity/Hysteresis: ±0.24%FSO
Temperature coefficient: ±0.1%FSO
Notes: FSO: Full Scale Output
1psi = 68.947 mbar = 0.068947 bar
1 psi = 6894.7 Pa = 68.947 hPa = 6.8947 kPa
0.1%RH, 0.1
o
C/F, 0.1hPa
10,000 measurements
Logging rate
Operating temperature
Battery type
Battery life
Dimensions/Weight
Selectable sampling interval: From 1 minute up to 18 hours
-35 to 80
o
C (-31 to 176oF)
3.6V Lithium (1/2 AA) (SAFT LS14250, Xeno XL050F or equivalent)
1 year (typ.) depending on logging rate, ambient temperature, & use of Alarm LEDs
101x25x23mm (4x1x.9”) / 172g (6oz)
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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 RHT50 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 below.
NOTE: Leaving the RHT50 plugged into the PC USB port longer than necessary will cause some of the battery
capacity to be lost.
WARNING: Handle lithium batteries carefully, observe warnings on battery casing. Dispose of in
accordance with local regulations.
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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