Oakton WD-37250-10 Acrylic 2 Speed Hygrothermograph, Spring Wound, 5.58" Diameter x 13.25" Width x 11.5" Height

The Oakton 37250-10 Hygrothermograph is a benchtop unit that has a choice of one or seven-day rotation for humidity and temperature recordings, and spring-wound power source requiring no batteries. Hygrothermographs are used to measure and document humidity and temperature over time in computer rooms, greenhouses, food storage rooms, warehouses, museums, and in quality control (QC) laboratories, education and research lab testing environments.

This hygrothermograph’s spring-wound system has a steady chart speed, even when the motor begins to run down, and keeps the chart running for eight days. It includes two gears for rotation changes. It has an aged bimetallic strip temperature sensor for accurate pressure readings, and a human hair bundle relative humidity (RH) sensor for accuracy. This unit has a protective acrylic cover that locks into place for security. Its sturdy base, tinted cover and carrying handle are light-weight and corrosion-resistant, for a range of use in indoor and sheltered outdoor environments. The hygrothermograph comes with one sheet of pre-attached chart paper, one red cartridge pen, and one blue cartridge pen. The two-speed hygrothermograph is factory pre-set for a seven-day rotation, and can be switched to a one-day operation by flipping the switch on the top of the cylinder drum. The response time is fifteen minutes for 45% of reading.

The 37250-10 hygrothermograph has a relative humidity range of 5-90%, accuracy + or - 3% from 10 to 90 RH; + or - 5% from 5 to 10% RH. It has a human hair bundle sensor, and chart graduations of 1% RH. Temperature range -10 to 50 degrees C/14 to 122 degrees F, accuracy + or - 1 degree C/+ or - 1.8 degrees F. It has a bimetallic temperature strip sensor, and chart graduations of 1 degree C/2 degrees F. Chart rotation is one-day (26 hours), or seven-day (172 hours). Exposure to RH levels above 90% can cause a decrease of about 7-10% RH in readings over the entire range due to temporary elongation of the hair bundle. When exposed to humidity levels below 80%, hair bundle will return to normal in about three weeks. The meter’s dimensions are 13.3(w) x 11.5(h) x 5.9(d) inches, and it weighs 9.0 lbs.

Hygrothermographs are used to measure temperature and humidity for various applications such as education, general purpose QC labs and research lab testing, and for biological process monitoring.

Oakton Instruments manufactures an array of scientific instruments for research, industrial, and educational uses. Since 1991, Oakton has distributed a wide variety of instruments such as meters, electrodes, and transmitters. Oakton is based in Vernon Hills, IL, and has facilities in Europe, Asia, and China.

What’s in the Box?

• Hygrothermograph
• Blue pen
• Red pen
• Rotation chart