Introduction
Thank you for selecting the Extech Instruments Model CO40. The CO40 simultaneously measures
CO concentration and Air Temperature. The CO40 is designed using vented ball technology for
fast response (<30 seconds) for sensing CO gas.
The user‐programmable high alarm alerts the user if the CO level rises above the programmed
limit.
This device is shipped fully tested and calibrated and, with proper use, will provide years of
reliable service. Please visit our website (www.extech.com) to check for the latest version of this
User Guide, Product Updates, and Customer Support.
Features
Portable meter capable of measuring CO and temperature accurately
Measures CO (0~999ppm) with alarm (alarm default 30ppm)
Dual display indicates air temperature and CO
Adjustable CO alarm threshold (0 to 999ppm) with audible beeper
Electrochemical, vented ball CO sensor technology
Tripod mount
Battery or AC Adaptor powered
IMPORTANT SAFETY NOTES
This Carbon Monoxide Monitor is intended for general purpose Air Quality monitoring only, and
has not been certified for use pursuant to any state or city safety Carbon Monoxide Alarm or
Monitoring requirements.
The CO40 Carbon Monoxide Monitor has not been tested by an independent lab to comply with
UL 2034 or IAS 6‐96 standard.
It is the responsibility of the customer to obtain and apply current local, state, and national
regulations with regard to CO alarms, monitoring and testing.
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EXTECH INSTRUMENTS
CO40‐en‐GB_v1.3 12/14
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