Extech RHT20 Humidity and Temperature Datalogger User Manual

1. Pengenalan

The Extech RHT20 is a humidity and temperature datalogger designed for monitoring environmental conditions. This device records up to 16,000 humidity and 16,000 temperature readings, providing comprehensive data for various applications. It features a user-programmable sample rate, USB interface for data transfer, and an LCD display for real-time readings and alarm status. This manual provides essential information for the proper setup, operation, and maintenance of your RHT20 datalogger.

• Accurate Humidity & Temperature Monitoring: Measures relative humidity from 0-100% and temperature from -40 to 158 °F (-40 to 70 °C).
• Large 16,000-Point Memory Capacity: Stores 8,000 humidity and 8,000 temperature readings with time and date stamp.
• USB Data Transfer to PC: Connects to a computer for data download, analysis, and reporting using included software.
• Calculates Dew Point Automatically: Provides precise dew point values.
• Reka Bentuk Padat & Mudah Alih: Lightweight and battery-powered for various monitoring locations.

2. Maklumat Keselamatan

Please read and understand all safety instructions before operating the device. Failure to comply with these instructions may result in damage to the device or personal injury.

• Do not expose the device to extreme temperatures, direct sunlight, or high humidity for extended periods.
• Elakkan daripada menjatuhkan atau menyebabkan peranti ini mengalami hentaman yang teruk.
• Jangan cuba membuka atau mengubah suai peranti. Rujuk semua servis kepada kakitangan yang berkelayakan.
• Buang bateri mengikut peraturan tempatan.
• Jauhkan peranti daripada medan elektromagnet yang kuat.

3. Kandungan Pakej

Sahkan bahawa semua item ada dan dalam keadaan baik semasa membongkar:

• Extech RHT20 Humidity and Temperature Datalogger
• Lithium Metal Battery (installed)
• Pendakap Pemasangan
• Kabel USB
• CD Perisian
• Manual Pengguna (dokumen ini)

4. Produk Lebihview

The Extech RHT20 datalogger features a compact design with an integrated LCD display and control buttons.

Rajah 4.1: Depan view of the Extech RHT20 Humidity and Temperature Datalogger, showing the LCD display, 'TEMP/%RH' button, and 'MAX/MIN' button.

Komponen utama termasuk:

• Paparan LCD: Shows current temperature, humidity, time, date, and alarm status.
• TEMP/%RH Button: Toggles between temperature and relative humidity display.
• Butang MAX/MIN: Memaparkan nilai maksimum dan minimum yang direkodkan.
• Port USB: Located at the bottom, used for connecting to a PC for data transfer and configuration.
• Penderia: Integrated sensor for humidity and temperature measurements.

5. Persediaan

5.1 Pemasangan Bateri

The RHT20 comes with a pre-installed Lithium Metal battery. If replacement is necessary:

1. Unscrew the two small screws on the battery compartment cover located on the back of the device.
2. Remove the cover and the old battery.
3. Insert a new 3.6V Lithium Metal battery (e.g., 1/2 AA size) ensuring correct polarity.
4. Gantikan penutup bateri dan kencangkannya dengan skru.

5.2 Pemasangan Perisian

The RHT20 requires proprietary software for full configuration and data analysis. The software is provided on a mini-CD. It is recommended to check the Extech website for the latest version and drivers.

1. Insert the software CD into your computer's CD/DVD drive. If your computer does not have a CD drive, download the software from the official Extech support webtapak.
2. Follow the on-screen instructions to install the software and USB drivers.
3. Ensure the installation completes successfully before proceeding.

5.3 Connecting to PC and Initial Configuration

Connect the datalogger to your PC using the supplied USB cable to set up logging parameters and synchronize time.

Rajah 5.1: The Extech RHT20 Datalogger connected to a computer via its USB port for data transfer and configuration.

1. Connect the mini-USB end of the cable to the datalogger and the standard USB end to an available port on your PC.
2. Launch the Extech Datalogger software.
3. Within the software, select the "Connect" option. The software should detect the device.
4. Navigate to the "Logger Set" or "Parameter Settings" section. Here you can configure:
   • SampKadar ling: Choose from 2s, 5s, 10s, 30s, 1m, 5m, 10m, 30m, 1hr, 2hr, 3hr, 6hr, 12hr, or 24hr.
   • Ambang Penggera: Set high and low limits for both humidity and temperature.
   • Mod Log: Options typically include stopping when memory is full or overwriting the oldest data.
   • Unit Pengukuran: Select Celsius or Fahrenheit for temperature.
   • Tarikh dan Masa: Synchronize the datalogger's clock with your PC.
5. Apply the settings to the datalogger. The device is now ready for data logging.

6. Operating the Datalogger

6.1 Starting Data Logging

Once configured via the software, disconnect the datalogger from the PC. Press and hold the "TEMP/%RH" button for approximately 3 seconds until the "REC" indicator appears on the LCD, signifying that logging has started. Place the datalogger in the desired monitoring location.

Rajah 6.1: The Extech RHT20 Datalogger mounted on a shelf, actively monitoring environmental conditions in a storage facility.

6.2 Viewing Current Readings

While logging, the LCD will continuously display the current temperature and humidity. Press the "TEMP/%RH" button to toggle between displaying temperature and relative humidity.

6.3 ViewBacaan MAKSIMUM/MINIT

Press the "MAX/MIN" button to cycle through the maximum and minimum recorded temperature and humidity values since logging began. Pressing it again will return to current readings.

6.4 Stopping Data Logging

To stop logging, press and hold the "TEMP/%RH" button for approximately 3 seconds until the "REC" indicator disappears from the LCD.

6.5 Muat Turun dan Analisis Data

After logging is complete, connect the datalogger to your PC via USB. Open the Extech Datalogger software and select the "Download Data" option. The software will retrieve the recorded data, which can then be viewed in graphical or tabular format, exported to a spreadsheet (e.g., .xls or .txt), or saved in a proprietary format for later analysis.

7. Penyelenggaraan

7.1 Pembersihan

Lap peranti dengan lembut, damp cloth. Do not use abrasive cleaners or solvents. Ensure the device is dry before use or storage.

7.2 Penggantian Bateri

Refer to Section 5.1 for instructions on replacing the Lithium Metal battery. Replace the battery when the low battery indicator appears on the LCD.

7.3 Penyimpanan

When not in use for extended periods, store the datalogger in a cool, dry place, away from direct sunlight and extreme temperatures. It is advisable to remove the battery if storing for several months to prevent leakage.

8. Penyelesaian masalah

• Peranti tidak dihidupkan: Check battery installation and ensure the battery has sufficient charge. Replace if necessary.
• "REC" indicator not appearing: Ensure the "TEMP/%RH" button is pressed and held for the required duration (approx. 3 seconds). Verify that the device is not connected to a PC, as logging typically starts after disconnection.
• Perisian tidak mengesan peranti:
  • Ensure the USB cable is securely connected to both the datalogger and the PC.
  • Verify that the USB drivers for the RHT20 are correctly installed. Reinstall if necessary.
  • Cuba port USB yang berbeza pada PC anda.
  • Mulakan semula perisian dan/atau komputer anda.
  • Check for any firewall or antivirus software blocking the datalogger software.
• Bacaan tidak tepat: Ensure the sensor is clean and unobstructed. Allow the device to acclimate to the environment for a few minutes before taking critical measurements.
• Data logging stops unexpectedly: Check the battery level. If the logging mode was set to stop when memory is full, download data and clear the logger to resume.

9. Spesifikasi

10. Waranti dan Sokongan

10.1 Maklumat Waranti

Extech instruments are warranted against defects in parts and workmanship for a specified period from the date of shipment (typically one year). For detailed warranty terms and conditions, please refer to the warranty card included with your product or visit the official Extech website. This warranty does not cover defects resulting from user modification, misuse, improper handling, battery leakage, or unauthorized repair.

10.2 Sokongan Teknikal

For technical assistance, troubleshooting, or service inquiries, please contact Extech customer support. You can find contact information and additional resources on the official Extech webtapak: www.extech.com/support. Please have your product model number (RHT20) and serial number ready when contacting support.