Measuring CO, CO2, CH4 or H2O in NEMA-rated enclosure


  • Air Separation Units & Nitrogen Plants
  • High-Purity Gases & Systems
  • Syngas & Fuel Gas Production
Detection and Matrix Range LDL (3σ) Precision (1σ) @ zero
CO in H20 − 2000 ppm150 ppb50 ppb
CO2 in H20 − 1500 ppm500 ppb170 ppb
H2O in H2 (low range)0 − 16 ppm1.0 ppb0.4 ppb
H2O in H2 (high range)0 − 400 ppm6 ppb2 ppb
CH4 in H2 (low range)0 − 8 ppm1.6 ppb0.6 ppb
CH4 in H2 (high range)0 − 100 ppm7 ppb2.5 ppb
Operating range See Detection Capability table
Detection limit (LDL, 3σ/24h) See Detection Capability table
Precision (1σ, greater of) ± 0.75% or 1/3 of LDL
Accuracy (greater of) ± 4% or LDL
Speed of response < 3 minutes to 90%
Environmental conditions 10°C to 40°C, 30% to 80% RH (non-condensing)
Storage temperature -10°C to 50°C
Gas Handling System and Conditions
Wetted materials 316L stainless steel (optional corrosion-resistant material), 10 Ra surface finish
Gas connections 1/4” compression fittings inlet, outlet and purge
Leak tested to 1 x 10-9 mbar l / sec
Inlet pressure 10 − 125 psig (1.7 − 9.6 bara)
Flow rate Up to 1.8 slpm (gas dependent)
Sample gases Nitrogen, hydrogen and syngas (inquire for custom matrices)
Gas temperature Up to 60°C
Dimensions, H x W x D
Standard sensor (in NEMA 4X enclosure) 17.5" x 22" x 15.2" (445 mm x 559 mm x 386 mm)
Standard sensor 82 lbs (37.2 kg)
Alarm indicators 2 user programmable, 1 system fault, Form C relays
Power requirements 90 − 240 VAC, 50/60 Hz
Power consumption 40 Watts max
Signal output Isolated 4−20 mA per sensor
User interface 5.7” LCD touchscreen
Class I, Div. 2, Groups B, C & D  
U.S. Patent #7,277,177  
Title / Description

CO-rekt Brochure (PDF)

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