USER GUIDE Desktop Carbon Monoxide Monitor Model CO50
EXTECH INSTRUMENTS Introduction Thank you for selecting the Extech Instruments Model CO50, this meter measures carbon monoxide (CO), air temperature, and humidity. The CO50 can be used to check indoor air quality and carbon monoxide problem areas. 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.
EXTECH INSTRUMENTS Meter Description Button Description SET Button: Set date and time Audible Alarm ON/OFF (SET+MODE) Alarm Limit Adjustment Toggle the time format (12/24 clock) SEL/RECALL Button: Move to next digit Short press to save current reading Long press to recall stored reading C/F/%RH Button with up arrow: Increase a value Press and hold to switch temperature units MODE Button with down arrow: Decrease a value Review Maximum (MAX) reading Meter Description 1. 2. 3. 4. 5. 6.
EXTECH INSTRUMENTS Operation POWER THE METER Plug the AC adaptor into meter and receptacle to turn on the meter. Reset the date and time each time the meter power is cycled. Remove the adaptor or switch off the AC power source to shut down the meter. GETTING STARTED All LCD display lines will switch ON when power is applied to meter. The LED indicator will also be ON steady with an orange color. The display will now auto zero.
EXTECH INSTRUMENTS MAXIMUM READING Press the MODE▼ button, the LCD will show the maximum reading since the meter was first powered. Press again to return to the normal measurement mode. To clear the maximum reading: Enter the Maximum mode and, when MAX Icon appears, press and hold the SET button, “Clr” appears for confirmation of clear command. CO ALARM SETTING 1. Press and hold the SET button for 3 seconds to enter the setup mode 2.
EXTECH INSTRUMENTS AUDIBLE ALARM BEEPER (ON / OFF) By default, the beeper is set ON, and the LCD shows the bell icon on the left side of the LCD screen. To switch OFF the audible alarm temporarily: From the normal measurement mode, press the SET + MODE▼ button at the same time (the bell icon disappears). After 4 minutes the alarm will turn on again automatically. To comply with UL regulations (2013), the beeper volume is 85 dB at a distance of 3 meters (9.8 feet).
EXTECH INSTRUMENTS MANUALLY STORE/RECALL 99 CO READINGS The CO50 can manually store a CO reading with a press of the SEL/RECALL button. The LCD shows the current record number (01‐99) in the humidity reading area each time a reading is manually stored (a short beep will sound each time a reading is stored also). To recall stored readings, press and hold the SEL/RECALL Button, the LCD shows the number of the record with its CO reading, to scroll other stored readings use the ▲ and ▼ buttons.
EXTECH INSTRUMENTS Specifications Measurements CO (ppm), Temperature oF/ oC , and RH% CO measurement range 000 to 999ppm CO resolution 1ppm CO accuracy ± 5% of reading or ±10ppm CO Sensor Electrochemical type Alarm alert Red LED and audible beeper > 85dB (3m distance) Temperature range ‐10 to 60oC (14 to 140oF) Temperature resolution 0.1oC/oF Temperature Accuracy ±0.6oC (1.2oF) RH range 10 to 90% RH RH Resolution 0.
