The Amprobe THWD-10W wireless relative humidity (RH) and temperature meter simultaneously measures relative humidity, dew point, and wet- and dry-bulb temperature using two temperature sensors (K-type thermocouple and thermistor) that provide a range of dual-scale temperature readings, and is used for HVAC, indoor air quality, and environmental applications. The K-type thermocouple sensor measures temperatures from -50 to 1832 degrees F (-50 to 1000 degrees C), and has a resolution of 0.2 degrees F (0.1 degrees C). The thermistor temperature sensor has a temperature range from 32 to 140 degrees F (0 to 60 degrees C), and has a resolution of 0.1 degrees F and C.
The meter has minimum, maximum, average, and hold functions for recording data, and relative zero functionality stores reference points. The meter has two-way wireless transmission to a personal computer up to 25 meters away without magnetic interference. Transmission requires a wireless USB antenna and software (included). The software supports Microsoft Windows NT, Windows 95, Windows 98, Windows 2000, Windows ME, Windows XP, and Windows 7 (32- and 64-bit). The meter requires four AAA batteries (included), and includes a k-type thermocouple, a wireless USB antenna, a CD-ROM, a shite box, and instructions.
| K-type thermocouple temperature accuracy (operating temperatures 64 to 82 degrees F) | For one year (not including thermocouple error): for temperatures -50 to 1,832 degrees F, accuracy is + or - (0.1 percent of reading + 2 degrees F; for temperatures -58 to -328 degrees F, accuracy is + or - (0.05 percent of reading + 1.4 degrees F) |
| K-type thermocouple temperature accuracy (operating temperatures 18 to 28 degrees C) | For one year (not including thermocouple error): for temperatures -50 to 1,000 degrees C, accuracy is + or - 0.1 percent of reading + 1 degree C |
| Thermistor temperature accuracy (degrees F) | For temperatures 32 to 50 degrees F, accuracy is + or - 4 degrees F, for temperatures 50 to 113 degrees F, accuracy is + or - 1 degree F, for temperatures 113 to 140 degrees F, accuracy is + or - 4 degrees F |
| Thermistor temperature accuracy (degrees C) | For temperatures 0 to 10 degrees C, accuracy is + or - 2 degrees C, for temperatures 10 to 45 degrees C, accuracy is + or - 0.5 degrees C, for temperatures 45 to 60 degrees C, accuracy is + or - 2 degrees C |
| RH accuracy | + or - 2.5 percent at 77 degrees F (25 degrees C) and 10 to 90 percent RH, and + or - 5 percent at 77 degrees F (25 degrees C) and 0 to 10 percent RH |
| RH sensor response time (90 percent of total range) | 60 seconds typical |
| Sensor hysteresis (excursion of 10 percent to 90 percent to 10 percent) | + or - 1 percent RH typical |
| Wireless frequency | 910 to 920 megahertz, low current consumption less than 1 milliamp (mA), transmitting distance up to 25 meters away without magnetic interference |
| Operating environment at less than 80 percent relative humidity | 32 to 122 degrees F (0 to 50 degrees C) |
| Storage environment (with battery removed) at less than 70 percent relative humidity | -4 to 140 degrees F (-20 to 60 degrees C) |
| Dimensions | 9.5 x 6.22 x 3 inches/241.3 x 157.98 x 76.2 mm (H x W x D) |
| Weight | Approximately .67 lb. (304 grams), including batteries |
H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.
Dataloggers log temperature and humidity readings in field and lab applications in the hydroponic, agriculture, educational and research industries.
Amprobe manufactures electrical testing equipment for commercial, industrial, and home use. The company was founded in 1948 and is headquartered in Everett, WA
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