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.
Gas filter correlation technology
Linearity through all ranges
Measures concentrations up to 10,000ppm
Standard dual range and auto ranges
Temperature and pressure correction
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
Voltage options:
  A: 120 VAC 50/60 Hz
  B: 220 VAC 50/60 Hz
  J: 100 VAC 50/60 Hz
Internal zero / span and O2:
  N: No zero / span valve (standard)
  A: No zero / span valve w/zero air scrubber
  Z: Internal zero / span valves
  C: Internal zero / span valves w/zero air scrubber
Filter Wheel Purge:
  S: Standard plumbing
  P: Filter wheel purge setup
Optional I/O:
  A: None (standard)
  C: I/O expansion board (4-20mA outputs- 6 channels, 0-10v inputs- 8 channels)
Mounting Hardware:
  A: Bench mounting (standard)
  B: Ears and handles, EIA
  C: Ears and handles, Retrofit
Compliance: ETL, CSA, UL, CE
Certifications: U.S. EPA, European TUV, MCERTS