RHT20 - Measuring equipment Extech - Free user manual and instructions
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| Product Type | Temperature and Humidity Data Logger |
| Brand | Extech |
| Model | RHT20 |
| Temperature Measurement Range | -30°C to 70°C (-22°F to 158°F) |
| Humidity Measurement Range | 0% to 100% RH |
| Temperature Accuracy | ±0.5°C (0.9°F) |
| Humidity Accuracy | ±3% RH (at 25°C, 20% to 80% RH) |
| Temperature Resolution | 0.1°C (0.1°F) |
| Humidity Resolution | 0.1% RH |
| Data Logging Capacity | Up to 16,000 readings per channel (total 48,000) |
| Sampling Interval | 1 second to 24 hours (programmable) |
| Interface | USB 2.0 Type Mini-B |
| Display | LCD with backlight |
| Power Supply | Battery: CR123A (3V lithium) |
| Battery Life | Approximately 1 year (typical usage) |
| Dimensions | 112 x 70 x 32 mm (4.4 x 2.8 x 1.3 in) |
| Weight | 150 g (5.3 oz) including battery |
| Operating Environment | Indoor, non-condensing humidity |
| Key Functions | Measure, log, display min/max/avg, dew point, alarms |
| Maintenance | Clean with a soft, dry cloth; avoid solvents |
| Safety Precautions | Use within specified ranges; keep away from liquids; replace battery promptly |
| Spare Parts & Repairability | Battery and USB cable replaceable; no user-serviceable parts inside |
Frequently Asked Questions - RHT20 Extech
How do I start logging data with the Extech RHT20?
Press the LOG button to begin logging. A blinking 'LOG' icon will appear on the display. To stop, press and hold the LOG button for 3 seconds.
Can I set the sampling interval?
Yes, connect the logger to a computer using the USB cable and use the RHT20 software (downloadable from Extech's website) to set the sampling interval from 1 second to 24 hours.
What type of battery does the RHT20 use and how long does it last?
It uses one CR123A 3V lithium battery. Battery life is approximately one year under normal usage (e.g., 10-minute sampling interval at 25°C).
How do I download the logged data?
Connect the RHT20 to a computer via USB. The device will appear as a removable drive or use the dedicated software. Copy the CSV files or use the software to export data.
Can I use the RHT20 outdoors?
The RHT20 is designed for indoor use only. It is not weatherproof and should be kept in dry, sheltered areas.
How accurate is the temperature and humidity measurement?
Temperature accuracy is ±0.5°C, and humidity accuracy is ±3% RH (at 25°C, 20-80% RH). For best results, allow the sensor to stabilize for 15 minutes after power-up.
Can I calibrate the RHT20?
The RHT20 is factory calibrated and does not require user calibration. For high-precision needs, send it to an accredited calibration lab.
What does the 'ALARM' feature do?
You can set high/low alarms for temperature or humidity via the RHT20 software. When a threshold is exceeded, the device will display 'HI' or 'LO' and the backlight may flash.
My RHT20 is not turning on. What should I check?
First, ensure the battery is inserted correctly. Try a fresh CR123A battery. If it still doesn't power on, connect it to USB; if the display lights up, the battery may be dead.
How do I clean the device?
Use a soft, dry cloth to wipe the exterior. Avoid using solvents or abrasive cleaners as they may damage the plastic or sensor.
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USER MANUAL RHT20 Extech
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Product information
Brand : Extech
Model : RHT20
Category : Measuring equipment