The Lutron HT-315 is a pocket-size meter that measures relative humidity, temperature and dew point through a separate probe. It reads 0 to 95 %RH and 0 to 50 °C at 0.01 resolution, shows both values on a dual LCD and offers data hold, max/min recall and RS 232 output.
The Lutron HT-315 is a pocket-size precision humidity meter that combines relative humidity, temperature and dew point measurement in one instrument. Its separate humidity and temperature probe (197 mm long) allows remote measurement, and the dual-function LCD shows humidity and temperature at the same time.
Humidity is measured from 0 to 95 %RH and temperature from 0 to 50 °C (32 to 122 °F), both with 0.01 resolution. Dew point is calculated automatically from the humidity and temperature readings over -25.3 to 48.9 °C. The humidity reading is automatically temperature compensated, and the typical response time is 5 to 30 seconds.
The microprocessor-based meter records maximum and minimum readings with recall, freezes the display with data hold, offers manual and automatic data logging and sends readings to a PC through its RS 232 serial interface. It runs on a 006P DC 9V battery and also has a DC 9V power adapter input socket.
| Manufacturer | Lutron |
|---|---|
| Model | HT-315 |
| Humidity Range | 0 to 95 %RH |
| Humidity Resolution | 0.01 %RH |
| Humidity Accuracy | ≥ 70 %RH: ± (3 % reading + 1 %RH); < 70 %RH: ± 3 %RH |
| Temperature Range | 0 to 50 °C (32 to 122 °F) |
| Temperature Resolution | 0.01 degree |
| Temperature Accuracy | 0.8 °C (1.5 °F) |
| Dew Point Range | -25.3 to 48.9 °C (-13.5 to 120.1 °F) |
| Dew Point Resolution | 0.01 °C / 0.01 °F |
| Dew Point Accuracy | Calculated automatically; sum of the humidity and temperature accuracy |
| Reference Conditions | 23 ± 5 °C |
| Response Time | 5 to 30 seconds typically (to reach 85 % of the reading value) |
| Temperature Compensation | Automatic, for the humidity function |
| Display | Dual-function LCD, 44 × 29 mm |
| Sampling Time | Approx. 0.8 second |
| Functions | Data hold; maximum & minimum memory recall; auto shut off or manual power off |
| Data Output | RS 232 PC serial interface |
| Operating Temperature | 0 to 50 °C |
| Operating Humidity | Main instrument: less than 85 %RH; probe: 0 to 95 %RH |
| Power Supply | 006P DC 9V battery (alkaline or heavy duty type); DC 9V power adapter input socket |
| Power Current | Approx. DC 4.6 mA |
| Standards | ISO-9001, CE, IEC1010 |
| Dimensions | Main instrument: 135 × 60 × 33 mm; humidity sensor probe: 197 mm length |
| Weight | 264 g (battery included) |
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