Meter Description; Lcd Display - Extech Instruments CO250 User Manual

Meter Description

METER
1. Temperature and Humidity sensor
2. sensor (rear)
CO
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
Wet Bulb Temperature
SYMBOLS
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
KEYPAD
Turns the meter on and off.
Enters setup mode.
Sets as non-sleep mode with
Exits setup page/mode.
Enters CO calibration with
2
Enters RH calibration with
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.
Selects unit or decreases value in setup.
Activates MIN,MAX,STEL,TWA function.
Saves and finishes settings.
.
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2 CO250-EU V1.2 6/09