Extech CO250 Operating Manual

User's Guide

CO2 Meter

Model CO250

Introduction

Congratulations on your purchase of this Model CO250 Meter. This meter measures

2 (Carbon Dioxide) levels, air temp., dew point, wet bulb temperature and humidity

CO
and is an ideal instrument for indoor air quality (IAQ) diagnosis. This meter is shipped
fully tested and calibrated and, with proper use, will provide years of reliable service.

Warranty

EXTECH INSTRUMENTS CORPORATION (A FLIR COMPANY) warrants this instrument to

be free of defects in parts and workmanship for one year from date of shipment (a six
month limited warranty applies to sensors and cables). If it should become necessary to
return the instrument for service during or beyond the warranty period, contact the
Customer Service Department at [phone] ext. 210 for authorization or visit our
website www.extech.com for contact information. A Return Authorization (RA) number
must be issued before any product is returned to Extech. The sender is responsible for
shipping charges, freight, insurance and proper packaging to prevent damage in transit.
This warranty does not apply to defects resulting from action of the user such as misuse,
improper wiring, operation outside of specification, improper maintenance or repair, or
unauthorized modification. Extech specifically disclaims any implied warranties or
merchantability or fitness for a specific purpose and will not be liable for any direct, indirect,
incidental or consequential damages. Extech's total liability is limited to repair or
replacement of the product. The warranty set forth above is inclusive and no other
warranty, whether written or oral, is expressed or implied.

Technical support: Extension 200; E-mail: [e-mail]

Repair & Returns: Extension 210; E-mail: [e-mail]

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other up-to-the-

minute product information, visit our website: www.extech.com

Support line [phone]



2

CO250 V1.2 1/09

Meter Description

METER

1. Temperature and Humidity sensor

CO2 sensor (rear)

2.

3. LCD display

4. AC Adaptor connector

5. RS232 port

6. Keypad

7. Battery compartment (rear)

LCD DISPLAY

1. CO2 concentration in ppm

2. Relative Humidity in %

3. Air Temperature, Dew Point or

SYMBOLS

KEYPAD

Wet Bulb Temperature

TWA Time weighted average( 8 hours)
STEL Short-term exposure limit (15 minutes weighted average)
HOLD Freezes current reading on display
MIN/MAX Minimum/Maximun readings

Low battery indicator
DP Dew point temperature
AIR Air temperature
WBT Wet bulb temperature
% Unit of relative humidity
C or F Celsius/Fahrenheit

Turns the meter on and off.

SET

Enters setup mode.
Sets as non-sleep mode with .

Exits setup page/mode.

CAL

Esc

Enters CO
Enters RH calibration with

2 calibration with .

DP/WBT

Freezes the current reading on display.
Cancels data hold function.

Activates or cancels the backlight.
Selects unit or increases value in setup.

Selects AIR, DP, WBT temps display.

DP/WBT

Selects unit or decreases value in setup.

Activates MIN,MAX,STEL,TWA function.

N
X

M/AV

Saves and finishes settings.

TWA

HOLD

ftm

m/s

STEL

O

CO

1

2

3

4

5

6

7

2

1

%

2

3

3

CO250 V1.2 1/09