Scheduled System Maintenance on May 29th, 2015:
IEEE Xplore will be upgraded between 11:00 AM and 10:00 PM EDT. During this time there may be intermittent impact on performance. For technical support, please contact us at onlinesupport@ieee.org. We apologize for any inconvenience.
By Topic

Multichannel digital ventilated psychrometer using eight-bit microcomputer

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Nantou, Y. ; Industrial Res. Inst. of Kanagawa Prefecture, Yokohama, Japan ; Suzuki, S.

A multichannel digital ventilated psychrometer using an 8-bit microcomputer has been developed. It offers the advantages of direct reading of the relative humidity (RH) and the temperature from the digital indicator (or the CRT indicator) as well as multichannel use. The sensing of humidity is based on the psychrometric principle by two integrated circuit (IC) temperature transducers acting as dry and wet bulbs. The temperature of the dry bulb has a range of 0-50°C with a linearity better than 0.05°C. The temperatures of the dry and wet bulbs are converted into proportional voltages which are fed into a microcomputer after having been converted into digital form by the A/D converter. As the RH data for dry-bulb temperature and dry- and wet-bulb temperature difference have previously been stored in the memory, the corresponding RH data can be derived from using the necessary steps of the program. The results are displayed on a digital indicator. The indication shows the channel number being measured, the RH, and the dry-bulb temperature. The experimental results show that it is possible to make an apparatus to give a direct indication of RH for the multiple sensors and the accuracy of the apparatus is estimated to contain an RH error of less than 2 percent with a response time of less than 20 s. It may be used both for measurement and control of a multiple humidity environment.

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:IM-30 ,  Issue: 2 )