Macurco OX-6 0-25% Low-Voltage Oxygen Gas Detector

The Macurco OX-6 is a low-voltage oxygen (O2) detector, controller, and transducer designed to monitor oxygen concentrations in commercial and industrial environments. Featuring a 0-25% oxygen detection range, adjustable alarm thresholds, a 5A ventilation control relay, and a 0.5A alarm relay, it detects oxygen-deficient and oxygen-enriched conditions. The OX-6 operates on 12-24 VAC or 12-32 VDC and includes a digital concentration display, audible alarm, and selectable 4-20 mA output for building monitoring systems.

Macurco OX-6 Low-Voltage Oxygen Detector, Controller and Transducer

The Macurco OX-6 is a fixed oxygen monitoring device designed to detect changes in atmospheric oxygen concentration and activate connected ventilation or alarm equipment. Its electrochemical sensor measures oxygen levels from 0% to 25% by volume, supporting monitoring for oxygen depletion and enrichment in gas storage rooms, cryogenic facilities, laboratories, hospitals, and industrial environments. The detector functions as a standalone monitoring controller or connects to compatible centralized gas detection systems. A three-digit LED display provides oxygen concentration readings, while an integrated 85 dBA audible buzzer measured at 10 cm provides local alarm notification. Macurco specifies a coverage area of up to 1,257 square feet, subject to installation conditions and application requirements.

The OX-6 provides two independently configurable relay outputs for ventilation control and alarm notification. Its 5A SPDT fan relay, rated for 240 VAC pilot-duty operation, supports connected ventilation equipment, valves, and motor starters. The fan relay has a default low-oxygen activation threshold of 20.2% by volume, with adjustable settings and a preset high-oxygen threshold of 23.5%. A separate 0.5A alarm relay supports normally open or normally closed operation, with a default low-oxygen alarm threshold of 19.5%. Programmable fan delays, minimum ventilation run times, and selectable latching operation allow the controller to respond to changing oxygen levels. The detector also activates its fan and alarm relays when internal diagnostic faults are identified.

The Macurco OX-6 oxygen monitor supports 12-24 VAC or 12-32 VDC input power, with a maximum power consumption of 3 watts. At 24 VDC, current consumption is approximately 23 mA in standby, 50 mA with the fan relay activated, and 75 mA when both relays are activated. A selectable 4-20 mA analog output represents the measured 0-25% oxygen concentration for integration with compatible monitoring and control equipment, including the Macurco DVP-120 control panel family. The digital display and audible buzzer can be independently enabled or disabled. Its configurable outputs allow the OX-6 to operate ventilation equipment, activate external warning devices, or transmit oxygen measurements to a centralized monitoring system.

The OX-6 features a dark gray enclosure measuring 4.5 x 4 x 2.125 inches and installs over a standard 4 x 4-inch electrical box, which is sold separately. Its specified operating temperature range is 0 F to 125 F (-18 C to 52 C), with 10-90% relative humidity, non-condensing. The detector includes a field-replaceable electrochemical oxygen sensor with an expected service life of approximately two years. Calibration verification and sensor replacement are supported using compatible Macurco calibration accessories and oxygen test gas. The OX-6 is ETL listed to UL 61010-1 and CAN/CSA C22.2 No. 61010-1 for electrical equipment safety. Installation and calibration must follow manufacturer instructions, applicable safety standards, and the ventilation requirements of the monitored facility.