Fieldpiece SCM4, Walk-Around Carbon Monoxide Detector

Cat # : 18U98

Model/Part # : SCM4


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Brand Fieldpiece
Catalog Number 18U98
Model/Part Number SCM4
Minimum Order Quantity 0.0
Base Unit of Measure Unit(S)
Type Carbon Monoxide Detector
Gross Weight 0.5 LB
Warranty 1 year

Product Overview

SCM4 – Carbon Monoxide Detector

The SCM4 Carbon Monoxide (CO) Detector has a very fast reaction time, and measures CO in parts per million (ppm). Its electrochemical sensor is fast enough for walk-around tests. Features and benefits include: Field-replaceable CO sensor; Advanced three-pin sensor measures 0 to 1000 ppm CO; Calibrate / Zero SCM4 to ambient quickly with the ZERO button; Audio and visual alarms w/mute; Bright-blue, backlit dual-display with MAX and real-time measurements displayed; Magnetic hanger for hands-free operation; Auto Power-Off (APO).

The “Walk-Around” Test:  The SCM4 responds to changes in CO levels in real time.

  • Zero the unit outdoors away from any source of CO (will not zero if CO levels are higher than 5ppm)
  • Enter the structure
  • Walk around and watch the display
  • Move toward the area of highest concentration to find the CO source

The SCM4 Carbon Monoxide Detector (CO Detector) offers several features and benefits to field technicians:

  • Field-replaceable CO sensor, Easy to install, Lasts approximately two years
  • Comes pre-calibrated
  • Fast electrochemical sensor helps you find CO sources like cracked heat exchangers or breached flue stacks
  • Calibrate to ambient quickly with ZERO button
  • Audio and visual alarms (with MUTE function)
  • Alarm rate increases as carbon monoxide concentration increases
  • MAX hold to help you zero in on the source
  • Bright-blue backlit dual-display to test in dark crawl spaces
  • Magnetic hanger for hands free testing
  • Auto Power Off (APO) to save battery life (easy to disable)
  • Battery check with % of battery life left displayed


  • Sensor Type: Electrochemical (specific to CO)
  • Sensor Calibration: Factory calibrated @ 17ppm CO and 200ppm CO
  • Range: 0 to 1000 ppm; 0 to 2000 ppm (less than 5 minute exposure time)
  • Initial Accuracy: @ 73°F±9°F, <75% R.H.
  • 0-15ppm ±5% reading ±1 ppm after zeroing
  • 16-35ppm ±5% reading ±2 ppm after zeroing
  • 36-1000ppm ±5% reading ±5ppm after zeroing
  • Long Term Drift: less than 5% per year (depending on use)
  • CO Air Sample Temperature Range: 32 to 105°F
  • Operating Environment: 32 to 122°F (0 to 50°C); 15 to 90% R.H., non-condensing
  • Storage Environment: 32 to 68°F (0 to 20°C) at <80% R.H. with battery removed from meter
  • Battery: 9V
  • Battery Life: 150 hours typical alkaline
  • Auto Power Off: After 15 minutes