48 i CO Analyzer

Measure the amount of carbon monoxide (CO) in ambient air with the Thermo Scientific™ Model 48i CO Analyzer. The gas filter correlation technique as utilized by the Model 48i gas filter correlation analyzer offers over 30 years of field-proven performance in providing accurate and reliable readings.

The Model 48i is based on the principle that carbon monoxide (CO) absorbs infrared radiation at a wavelength of 4.6 microns. Because infrared absorption is a nonlinear measurement technique, it is necessary for the instrument electronics to transform the basic analyzer signal into a linear output. The 48i uses an exact calibration curve to accurately linearize the instrument output over any range up to a concentration of 10,000ppm.

Key Features:

  • Gas filter correlation technology
  • Linearity through all ranges
  • Measures concentrations up to 10,000ppm
  • Standard dual range and auto ranges
  • Temperature and pressure correction

iSeries Advantage:

  • Ethernet connectivity for efficient remote access
  • Enhanced user interface with one button programming and large display screen
  • Flash memory for increased data storage and user downloadable software
  • Enhanced electronics design optimizes product commonality
  • Improved layout for easier accessibility to components

The Mode 48i CO Analyzer is also available with an oxygen sensor module.

The Model 48i with Oxygen uses paramagnetic sensor technology to extend CO measurement capabilities, reading and reporting the concentration of oxygen in the sample stream up to 100%. Additionally, programming allows the user to correct the CO reading for the amount of oxygen in the sample.



Preset ranges0-1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000 and 10000 ppm
0-1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000 and 10000 mg/m3
Custom ranges0-1 to 10000 ppm, 0-1 to 10000 mg/m3
Zero noise0.02 ppm RMS (30 second averaging time)
Lower detectable limit0.04 ppm
Zero drift< 0.1 ppm
Span drift+/-1% full scale
Response time60 seconds (30 second average time)
Precision+/-0.1 ppm
Linearity+/-1% full scale < 1000 ppm
+/-2.5% full scale > 1000 ppm
Sample flow rate0.5-2 liters/min.
Interferences< lower detectable limit except for the following:
(EPA Levels) NO < 3 ppb, M-Xylene < 1 ppb, H2O < 3% of reading
Operating temperaturePerformance specifications based on operation within 20°-30°C
range (per U.S. EPA Guidelines). Instrument may be safely operated
over the range of 0°- 45°C.
Power requirements100 VAC, 115 VAC, 220-240 VAC +/-10% @ 275W
Size and weight116.75″ (W) × 8.62″ (H) × 23″ (D), 49 lbs. (22.2 kg)
OutputsSelectable voltage, RS232/RS485, TCP/IP, 10 status relays and power
fail indication (standard) 0-20 or 4-20 mA isolated current output (optional)
Inputs16 digital inputs (standard), 8 0-10Vdc analog inputs (optional)
and certifications
U.S. EPA Equivalent Method: RFCA-0981-054
MCERTS Certified: Sira MC070095/00
EN14626: TÜV 936/21203248/A Report