Comfort Chek
400 Operation Manual
1509-9000 Rev 4 9
4.6. Audible Alarm
The instrument has an audible alarm to provide warnings to the user when CO
2
concentrations exceed the limit (see P1.0 in setup for setting alarm threshold). It emits
beeps (about 80 dB) when measured CO
2
concentration exceeds the preset value
and stops when any key (except SET) is pressed or readings fall below the preset
alarm value. It beeps again when the value once again exceeds the preset limit.
Restart the instrument if the beeping cannot be stopped.
4.7. Auto Power Off
The instruments automatically switches off after 20 minutes of inactivity to save on
battery life. To override this function, power on the instrument by holding down the
SET and HOLD buttons for 2 seconds until “n” appears on the LCD.
NOTE: Auto sleep function is disabled during calibration mode.
4.8. Setup Mode
Hold down the “SET” button for more than 1 second while in normal operation mode
to enter the set up mode. To exit set up mode, press the CAL Esc button in P1.0 or
P3.0 and it returns to normal operating mode.
4.9. P1.0 CO
2
Alarm Level
When entering the set up mode, P1.0 and AL are indicated on the LCD. Press
MNX/AV button to go into P1.1
for setting the CO
2
alarm threshold. The current set
value will be blinking on the LCD. Press the MODE (up arrow) button or DP/WBT
(down arrow) button to change the set point in intervals of 100 ppm. Press the
MNX/AV button to save changes, or the CAL Esc button to exit without saving.
Figure 4-7. Entering Setup Mode Figure 4-8. Current Set Value (Blinking)
4.10. P3.0 Temperature Units
Press the MODE (up arrow) button or DP/WBT (down arrow) button in P1.0 to access
P3.0
for setting up the temperature scale. Press the MNX/AV button and it enters P3.1
mode with blinking
°C or °F current settings on the lower left area of the LCD. To
switch between
°C and °F, press the MODE (arrow up) button and DP/WBT (arrow
down) button. Then press the MNX/AV button to save the setting or CAL Esc button to
exit without saving and return to P3.0.
(48 Seiten)
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