3M™ Macurco™ Select Carbon Monoxide Fixed Gas Detectors

3M™ Macurco™ Carbon Monoxide Fixed Gas Detectors CM-21A manufactured on June 17, 2011 may have a condition where the fan relay potentially activates in clean air conditions (meaning air containing 0ppm of carbon monoxide). The affected units are date coded 6/17/11 (the date code is located on the back side of the mud ring as well as under the front cover on the printed circuit assembly). 3M will replace all CM-21A gas detectors covered by this notice at no charge.

Product Notice (PDF 146 KB)