Assmann Psychrometer with JMA Certificate, −30 to 50°C

Feature

■ Overview

Due to its high reproducibility, Assmann aspirated psychrometer has gained great trust as a standard tool for the measurement of relative humidity.

SK-RHG series is one of such which is improved in ease of operation and accuracy furthermore. Wicks on a wet bulb instead of conventional gauze are easy to be replaced. A water supply bottle attached on the unit has relieved you from replenishing of water for a long duration.

Also, SK-RHG series accepts both AC and DC inputs, and it can rotate the fan for 20 hours continuously with just two D batteries to ventilate stably with a wind speed of 3 m/s or more.

    In addition, this SK-RHG-S model with a certificate by Japan Meteorological Business Support Center, an official authority under the JMA (Japan Meteorological Agency), has chrome-plated body to hold thermometers to reduce affection of heat radiation. This technique has made SK-RHG-S the best solution regardless of locations from indoors to outdoors, laboratories to factories.

■ Outline of psychrometer

A psychrometer is composed of two identical glass thermometers, with one of them whose bulb is covered with a wet wick. This bulb is called as a wet bulb while the other is defined as a dry bulb.

Water on a wet bulb takes heat away when it gets evaporated so that the humidity can be calculated from the gap of the temperatures on the wet bulb and the dry bulb.

There are two genres of psychrometer: aspirated psychrometer which SK-RHG series belongs to, and simple psychrometer.

Aspirated psychrometer has a fan to blow air to the wet bulb to realize precise measurement compared to a simple psychrometer.

In addition to the above categories, aspirated psychrometer is classified into three types as mercury thermometer type like SK-RHG series, resistance thermometer type, and thermocouple type. Regardless of difference in methods, what is essential for accurate measurement is a proper ventilation around the wet bulb. Every aspirated psychrometer is designed to blow the wind for a necessary amount.

■ Assmann psychrometer: a user-friendly and reliable choice

Among the aspirated psychrometers, mercury thermometer type is the most popular one. This type is consist of glass tube thermometers filled with mercury and a ventilator to offer a stable wind to the sensing part of the thermometers.

Easy to carry and install, free from complicated maintenance, capable of stable and reliable measurement for a long period of time—Assmann psychrometer is the ultimate choice for those who need to measure humidity.

Description

■ Make sure to replace two thermometers simultaneously if either one needs replacement.

If only either of the pair is exchanged with a new one, the spacing between the graduations on the thermometers may differ.

Note that the certificate by JMA will be invalid if either one or two is replaced or damaged. Ask us for retest of certification.

■ Tripod (left, Cat. No. 7450-40) and Compact Stand (right, Cat. No. 7450-30) sold separately:

■ Standard accessories are shown below. Note that only the compact stand is sold separately.

Specifications