GREENVILLE – Clean tech company Kerdea Technologies, provider of micro-chip oxygen sensors for automobile engines, has raised $150,000 in equity.

Twenty-three investors contributed to the round, according to a recent securities filing.

Other than the payment of salaries and other compensation and benefits and reimbursement of expenses, no officer, director, partner, manager or promoter will receive any payments from the proceeds of this offering, the filing noted.

Founded in 2012 by Ken Fosaaen, the Greenville-based firm specializes in developing emmission sensors for detecting exhaust gases in any combustion process, which helps in controlling air-fuel ratio.

To date, the company has raised more than $3.3 million.