Specifications

CO2 Analyzers 3100 & 3150
Instruction 19-9339 38
3) Once a stable reading is shown, press the soft-key “ACCEPT.”
A successful span calibration message will then be displayed.
Press the soft-key “ACCEPT” again to confi rm the calibration
and “STORE” the new user span. Alternatively, press soft-key
“REJECT” to exit without change.
NOTE: If the calibration failed then try again using a longer purge
time or different target gas.
7.5.3 Zero O
2
Channel
It is not necessary to zero the O
2
channel. A span calibration should
correct the reading across the entire range.
7.5.4 Span O
2
Channel
It is recommended that the O
2
channel is spanned in fresh air with
a target concentration of 20.9%, although other gases and target
concentrations can be used if required.
1) If not already preset, enter the span target (i.e. certifi ed
concentration of your calibration gas) by pressing “KEY 1” followed
by the desired value. Press ENTER to store.
2) Press the soft-key “START” and wait for the reading to stabilize.
Press the “PUMP” key to draw in fresh air. It can take a couple of
minutes to stabilize.
3) Once a stable reading is shown press the soft-key “ACCEPT.” A
successful span calibration message should then be displayed.
Press the soft-key “ACCEPT” again to confi rm the calibration and
“STORE” the new user span. Alternatively, press the soft-key
“REJECT” to exit without change.
NOTE: If the calibration failed then try again using a longer purge
time or different target gas.