A-4000-120 Johnson Controls Indicator

Overview

The Johnson Controls A-4000-120 is a calibrated oil indicator equipped with a needle valve, designed to detect aerosol-mist levels of oil entrainment in compressed air systems. It helps monitor air purity to prevent proactive oil carryover from impacting system performance.

Features

• Visual oil status checks via a color-changing calibrated plastic tube with red oil-soluble dye
• Integrated needle valve for convenient oil flow control and service isolation
• Durable brass construction engineered for long-term reliability in compact mechanical spaces
• Accompanied by a conversion chart to determine exact oil concentration values

Specifications

• Line Pressure Range: 10 to 125 PSIG (70 to 875 kPa)
• Measuring Flow Rate: Less than 2 SCIM/PSIG (0.08 mL/s/kPa)
• Maximum Operating Temperature: 120°F (52°C)
• Connection Size: 1/8 inch NPT
• Length: 4.5 inches
• Minimum Sensitivity: 0.01 PPM (0.012 mg/m³)

Applications

• Monitoring oil carryover at compressor discharge tanks in industrial environments
• Checking filtered air supply quality before connection to pressure reducing valves
• Routine compressed air treatment and maintenance in commercial pneumatic HVAC systems