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GfG RAM 4021 Respiratory Air Monitor with toggle switch, Carbon Monoxide (CO) - 4021-TS

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GfG RAM 4021 Respiratory Air Monitor with toggle switch, Carbon Monoxide (CO) - 4021-TS

GfG RAM 4021 Respiratory Air Monitor with toggle switch, Carbon Monoxide (CO) - 4021-TS


4021-TS RAM 4021 Respiratory Air Monitor with toggle switch, Carbon Monoxide (CO) by GfG

The RAM 4021 AutoCal® series is the unit of choice where specific and accurate measurement of carbon monoxide, oxygen or dew-point levels are required. Designed to meet OSHA requirements for monitoring of Grade D respirable air, this unit is equipped with a reliable electrochemical sensor that accurately indicates the level of carbon monoxide on an illuminated liquid crystal display. Adding versatility, this unit offers optional oxygen or dew point sensors for applications where detection or measurement is needed.

Calibration and maintenance are simple with our innovative AutoCal® system. Additional features including alarm relay contacts, user adjustable alarm point, low flow alarm indicator and many more make this unit an intelligent choice. The RAM 4021 is available in four models, the 4021 (CO), 4021-1 (CO and O2), 4021-DPX (CO and dew point levels) and 4021-PR (CO and additional relay to signal power loss to monitor, complies with newest NFPA regulation). All models may be purchased with or without airline filter systems

Respiratory air specifications

All GfG Instrumentation RAM Instruments satisfy the requirements of OSHA rule 29 CFR 1910.134 (d) (2) (ii) for carbon monoxide monitoring. They will also monitor Grade E air, generally specified for breathing air in cylinders (SCBA).

Wall mounted filter panel option

8025 (25 CFM), 8050 (50 CFM), and 8100 (100 CFM)

The 25, 50 and 100 CFM panels filter out dangerous toxins from supplied air sources and ensure clean, breathable air. The threestage filter system efficiently removes particulates, oil vapors and hydrocarbons from an air supply. After filtration, the regulator sets the pressure for the respiratory equipment and the manifold assembly provides multiple outlets for airline hose quick connections. The model 8025 panel includes two user female quick connect outlets; the 8050 includes four, and the 8100 includes eight. A 1/2" FPT connection is standard on all 50 and 100 CFM panels, and a 3/8" FPT connection is standard on all 25 CFM panels.


  • Continuous compressed air CO monitor
  • Integrated dew point measurement
  • Robust easy-to-operate design


  • RAM 4021 Monitor
  • Carbon monoxide (CO) sensor
  • Other sensors (as specified)
  • Manual
Gases Carbon monoxide (CO)
Oxygen (O2)
Dew point
Detection ranges CO 0-100 ppm
O2 0-25% volume
4021-DPH 10 to 70°F / -12 to 21°C
4021-DPL -40 to 15°F / -40 to -9°C
4021-DPX -112 to 68°F / -80 to 20°C
Detection principles (sensor) CO specific Electrochemical cell
4021-DPL / 4021-DPH Solid state hydro
4021-DPX Thin film technology
Air temperature +32 to +122°F / 0 to 50°C
Display Digital LCD
Expected sensor life O2, CO Greater than 2 years
Dew point Greater than 2 years
Adjustable alarm points CO 5 ppm CO and 10 ppm CO
O2 19.5% and 23.5% volume
Dew point 39°F / 4°C (L) 10°F / -12°C
Alarms Visual LEDs
Audible Case mounted horn
Relays Two dry contacts
Airline input 1/8" feed Standard pressure 70 to 150 psi
1/2" FPT 50 to 100 CFM panels (wall mount)
3/8" 25 CFM panels (wall mount)
Available relay contacts and ratings 1 alarm (red) NO/NC
1 warning (yellow) NO/NC
1 power loss NO/NC (4021-PR only)
Sample flow rate 0.5 cubic feet of air per hour (scfh)
Power source 110 VAC or 12 VDC
Temperature range 32 to 105°F / 0 to 40°C
Dimensions (monitor only) 7.3x5.9x4 inches (185x150x101 mm) (HxWxD)
Weight (monitor only) 5 pounds (226 kg)
Available models 4021 Carbon monoxide
4021-1 Carbon monoxide and oxygen
4021-DPL, 4021-DPH and 4021-DPX Carbon monoxide and dew point
4021-PR Carbon monoxide (complies with
NFPA ’99 C-*26 (
Available filter panel options 8025 wall mounted 25 CFM panel (2 ports)
8050 wall mounted 50 CFM panel (4 ports)
8100 wall mounted 100 CFM panel (8 ports)

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