Pro CO Analyzer with Low Pressure & High Temp Alarms


This Pro CO Alarm analyzer combines carbon monoxide detection, a low-pressure alarm and an external high-temperature sensor. The included SPDT relay cable (10A @ 230VAC/30VDC ampacity) can connect to auxillary equipment to trigger external alarms, emergency backup systems, or compressor shutdown. Components are mounted in a water- and impact-resistant case with a clear cover that is compatible with outdoor and marine environments. Available in two power options.


This version of the Pro CO Alarm analyzer detects:

(1) CO in air flow from an operating compressor in excess user-defined set points
(2) Compressor air outlet temperatures in excess of 350°F/177°C
(3) Low air supply pressure, factory set at 100 psi (7 bar)

If the analyzer readings fall outside of alarm set points, a relay sounds a piezo alarm and illuminates one of three panel LEDs (one each for CO, temperature and pressure). This same relay (10A @ 230VAC/30VDC ampacity) can activate an external relay to automatically shut down compressors, sound an external alarm or activate emergency backup systems.

The system includes an external temperature sensor with 12-feet of cabling, an externally mounted calibration gas inlet and exhaust port. Two power options available.


  • Compressor mounted instrument
  • LCD display
  • On/Off switch
  • Rugged weatherproof housing
  • Low maintenance required
  • Low power consumption
  • Battery test function
  • Audible and visual alarms
  • Cable relay for optional auxiliary equipment control


Flow Rate 0.5-1 L/min
Resolution 1 ppm CO
Repeatability <+5%
Accuracy ±5%
Sensor Type Electrochemical (CO)
Expected Sensor Life >24 months in normal use from date of manufacture (CO)
Range 0-50 ppm CO
Alarms • Two user-programmable audible and visual CO alarms
• High temperature alarm at 350°F (177°C)
• Low pressure alarm at 100 psi (7 bar)
SPDT Relay Ampacity
10A @ 230VAC/30VDC
Response Time <50 seconds over complete temperature range (CO)
Operating Temperature 14° to 122°F (-10° to 50°C) continuous
-4° to 122°F (-20° to 50°C) intermittent 
Operating Humidity Non-condensing: 15-90% continuous; 0-99% intermittent
Storage Temperature 14° to 140°F (-10° to 60°C)
Power • Rechargeable Lithium Battery (SKU 9621-LB)
• Wall Plug-in [International] (SKU 9621-E)
(L x W x H)
7.41 × 7.79 × 4.31 in
(18.8 × 19.8 × 10.9 cm)
Weight 7.8 oz (0.22 kg)
Warranty 12 months
Replacement Sensor SKU 9501

WARNING: Never expose gas sensors to pressure or you may cause damage and/or false readings. Damaged sensors will not provide accurate gas analysis. Most gas analyzers can be used to analyze a regulated gas sample flow, the contents of a gas cylinder, or the flow from a regulator. The flow rate of gas must equal 1-5 L/min. To produce this flow, a Flow Restrictor and Regulator may be required. A faulty Flow Restrictor can lead to a false analyzer reading. Flow Restrictors should be regularly tested with a Flow Meter. Inaccurate gas analysis can lead to serious personal injury or death.