User's Manual

975
Users Manual
22
3. Press  [CO
2
].
4. Specify one-point or two-point calibration methods.
The one-point method uses CAL gas only. The two-
point method uses CAL gas and also Neutral gas
(Nitrogen).
If one-point is chosen:
a. Use  [DOWN] and  [UP] to choose the
CAL gas concentration.
b. Press  [ENTER] to enter the concentration.
c. Apply the CAL gas and press  [OK], press
 [SKIP] to exit calibration mode. The Meter
will now calibrate the CO
2
sensor for 2 minutes.
Press  [Cancel] to exit calibration mode. If
calibration fails, repeat the procedure. If it fails a
second time, have the Meter serviced.
d. The Meter finishes the procedure then prompts
the user to enter the time until the next
calibration. Enter the amount using 
[DOWN] and  [UP] to change the number
and  [ENTER] to store the number.
If two-point is chosen:
a. Apply the neutral gas (Nitrogen) or press 
[Cancel] to exit calibration mode.
b. When zeroing is complete, remove neutral gas
(Nitrogen) and press  [OK] or  [Cancel]
to exit calibration mode.
c. Apply the CAL gas. Enter the amount using 
[DOWN] and  [UP] to change the number and
 [ENTER] to store the number
.
d. Apply cal gas and press  [OK] or 
[Cancel] to exit calibration mode.
e. The Meter finishes the procedure then prompts
the user to enter the time until the next calibration.
Enter the amount using  [DOWN] and 
[UP] to change the number and  [ENTER] to
store the number.
CO
2
sensor calibration is now complete and the Meter
exits calibration mode.