Introduction

20-year experience offers you excellent humidity measurements.

relative humidity sensor/TI-E/TI-A


Welcome to Toplas Engineering Co., Ltd.
You are looking for a good humidity sensor elements, its
transducers (transmitters) or hygrometers, are not you.
If yes, please stick around our home pages.

We successfully have developed capacitance changing type
humidity sensor elements and its transducers with advantage of:

 + Interchangeability within 2%RH tolerance,
 (no calibration is needed when the sensor element is replaced.)
 + Excellent durability over wide humidity and temperature range.


This development is a result of over-20-year researches on humidity sensing mechanism in capacitive
humidity sensors including a doctoral thesis.

History of Humidity Sensor Development

1979 Research on capacitive humidity sensor was started with a help of Professor Tadao Inuzuka of
Aoyama Gakuin University.

1981 1st announcement on the sensor in the conference of applied physics society of Japan.

1982 1st paper on the humidity sensor

1984 Research on sensing mechanism was clarified. Based on the mechanism, new sensing material
was selected. Prototype TI series having the advantage of fundamental humidity characteristics
and stability.

1993 All of the results are summarized in doctoral thesis.

Papers