Yokogawa Electric Corporation ACG10S-E2120AIP903 Coupler

The Yokogawa AC1-5-S-D-R Automatic Calibration Unit automates zero- and span-calibration gas delivery to oxygen analyzers, commonly paired with Yokogawa ZR402G systems and ZR22G probes in boilers, furnaces, and industrial combustion processes. It supports analyzer-controlled, timed automatic, or manual override operation, enabling fully automatic or semi-automatic calibration via solenoid valves. Key specifications include 24 VDC control power for the solenoids and 120 VAC main power (model dependent), operating pressure around 20 psi (max ~35 psi), calibration gas flow about 0.6 LPM and reference air flow about 0.8 LPM, and a flowmeter range of 0.15–1 LPM. Gas connections use 1/4" FNPT fittings, with standard 1/4" copper tubing or a stainless steel option, and enclosures available as NEMA 4 or NEMA 4X depending on model. The unit provides a single-point calibration channel and is designed to automatically deliver zero and span calibration gases via the valve manifold; common replacements include Yokogawa AC4, AC8, and IAC-24 Integral Calibration Unit.