ACI Electromechanical Carbon Monoxide Detector
ACI Electromechanical Carbon Monoxide Detector
Item # A/CO-R

The ACI/CO Series is a microprocessor based transmitter. It uses an Electrochemical gas sensor to detect a variety of gases. Typical applications are enclosed parking facilities, refrigeration rooms and oxygen storage rooms. QEL engineers, through extensive research and development, have designed the M5 to be an industry leader in performance and application. The M5 offers good value. Standard features within the M5 can only be found as expensive options in other manufacturers’ product. A digital display (LCD), push-button programming and on-board meter jacks are all standard. The transmitter provides an analog output of 4-20 mA DC or 2-10 VDC, linear to the measured gas range, for transmission to the Building Automation System (BAS) or controller supplied by others. The signal is fully user assignable over the gas range and can be configured for rising of falling gas concentration. In addition, the RS-485 communications is built in. 

Features and Benefits
  • Designed to be maintenance free and stable
  • Factory-configured and calibrated
  • Sensor calibration is a simple zero and span adjustment
  • Signal fully user assignable over the gas range
  • Built-in communications
  • Fire retardant Polycarbonate/ABS blend enclosure
  • Model A/CO-R-LCD available with LCD display
  • 2-year warranty
Product Specifications
3.50” x 6.00” x 1.09” (WHD)
Input Voltage
24VDC or 24VAC floating or one side ground
4 – 20mA, +2 – 10VDC, digital RS-485
Operating Range
0 to 125 ppm (standard); 0 – 250 ppm (maximum)
Coverage Area
7,500 ft2
Operating Temperature
-4° to 104° F
Operating Humidity
15% to 90% non-condensing, 0% to 99% intermittent
Sensor Type
Supply Current
100mA nominal; 250mA maximum
Response Time
Less than 60 seconds typical for a 90% step change


5418 Elmwood Ave | Indianapolis IN 46203 | 888-652-9663