The RH401 Digital Psychrometer + InfraRed Thermometer measures Humidity, Air Temperature, Dew Point and Wet Bulb.
This manual provides instructions for the Extech RH401 Digital Psychrometer + InfraRed Thermometer, which measures humidity, air temperature, dew point, wet bulb, and surface temperature via infrared. Key features include a retractable probe, programmable auto power off, backlight, and an RS-232 interface for PC data acquisition.
| Humidity Range | 0.0 to 100.0% RH |
|---|---|
| Humidity Accuracy | ±3% RH (10 to 90%) |
| Air Temperature Range | -4.0 to 122.0°F (-20 to 50°C) |
| Air Temperature Accuracy | ±1.8°F (±1°C) |
| IR Emissivity Range | 0.3 to 0.99 |
| IR Spot/Distance Ratio | 8:1 |
| Battery Life (Laser Inactive) | approx. 150 hours |
| Dimensions | 6.8x2.7x1.9" (175x70x50mm) |
It indicates an IR temperature failure or temperature failure, requiring repair or replacement.
The RH calibration procedure takes approximately one hour to complete.
The default value is 0.95, which is typical for many non-metallic surfaces.