Manufacturer of Level Switch, Level Transmitter,
Detector and Sensor DITECH,LTD.

In 1965, vacuum tubes were mainly used for both level controllers (level switches) and level transmitters. However, they posed problems such as high electricity consumption and high temperature (not suitable for explosion-proof construction), unstable measurement accuracy, and production that required skilled workers (high cost).

Toyoharu Iizaka joined Daiki Kogyo Co., Ltd. in 1966. Shortly after joining the company he succeeded in the practical application of capacitance using semiconductor material, which used to be considered extremely difficult, for the first time. He completed a capacitive level switch, capacitive level transmitter, and self-balancing interface level transmitter, and obtained patents as an inventor.

In his 20s, Iizaka was appointed engineering manager and as the person in charge of developing industrial instruments. He continued to work with Morimoto, Matsumura, and Tsutsui to complete the lineup of capacitive level switches (QH and SH types), capacitive level transmitters (QB and SB types), and self-balancing interface level transmitters (QC and QS types). They appeared to be on the path to success as salaried engineers when in September 1974, the company went bankrupt, abruptly bringing their careers to an end.

Iizaka was repeatedly solicited by a major manufacturer with an attractive offer. Meanwhile, due to strong requests and tremendous support from customers, the four founding individuals held frequent discussions that continued late into the night. Eventually, in October 1974, Iizaka, Morimoto, Matsumura, and Tsutsui (the current plant manager) founded DITECH as a privately owned enterprise.
It was both morally and legally improper to be released from debt but continue to use the same trading name of the former company, so the company name was changed to DITECH (an acronym of Dielectric, Detector, Electrostatic, Technology).
Many people applied to join the new company, but it was financially difficult to hire more personnel, so DITECH was founded by the four individuals.

The product names (trademarks) of QH, SH, QB, SB, QC, and SC types were not used for the same reason mentioned above. New circuits were designed at the Amagasaki Plant (which was available for lease) to develop improved capacitive level switches (NQH and NSH types), capacitive level transmitters (QBS and NSB types), and self-balancing interface level transmitters (NQC and NSC types).

In May 1975, the company was incorporated as DITECH, Ltd. because the prospects for the business looked good.