Q23/QH23 Series The Turck Banner Q23 and QH23 series miniature DC photoelectric sensors in a right-angle housing is totally self-contained with a 10 to 30VDC operation. The Q23/QH23 series sensors also includes self-diagnostic circuitry and has a visible red sensing beam that helps simplify set-up. The sensors have LED indications for Power ON, Output status (including overload condition), Alignment and marginal signal.