
Comfort Chek
400 Operation Manual
6 1509-9000 Rev 4
LCD Symbol Description
TWA
Time Weighted Average (8 hours)
STEL
Short-Term Exposure Limit (15 minute weighted average)
HOLD
Readings are frozen and remain unchanged
MIN/MAX
MINimum/MAXimum readings
Low battery indicator
DP
Dew Point temperature
AIR
AIR temperature
WBT
Wet Bulb Temperature
%
Unit of measurement of relative humidity
°T (C/F)
Celsius/Fahrenheit temperature unit of measure
3.3. Keypad
Keypad Button Description
Switches instrument on and off
Enters set up mode
Sets as non-sleep mode along with “HOLD”
Exits set up page/mode
Enters CO
2
calibration along with “MODE”
Enters RH calibration along with “DP/WBT”
Freezes the current readings
Cancels data hold function
Activates or cancels the backlight
Selects unit or increases value in set up
Selects AIR, DP, WBT temps display
Selects unit or decreases value in set up
Activates MIN, MAX, STEL, TWA functions
Saves and finishes settings
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