Specifications

CO2 Analyzers 3100 & 3150

Instruction 19-9339 37

2) Press either “KEY 1 - ZERO WITH N

” (recommended) or “KEY 2 -

ZERO WITH AIR” from the menu. Then, either attach the 100% N

or sample pipe to allow access to fresh air.

3) Press the “START” key. The instrument will now wait approximately

60 seconds for the gas reading to stabilize at the correct level.

Ensure the pump is on (pump icon appears in lower middle of

screen when on).

4) The instrument will then indicate a successful zero has been

completed. Press the soft-key “ACCEPT” to conﬁ rm the calibration

and “STORE” the new user offset. Alternatively, select the soft-key

“REJECT” to exit without change.

NOTE: Typical zero calibration, although displaying zero, needs to be

given time to settle. We recommend accepting the calibration

at least ﬁ ve minutes after the display concentration stabilizes.

NOTE: If the calibration failed, purge and try again or select a

different air source.

NOTE: If using the Analyzer 3150 - very high concentrations of CO

may take up to 30 minutes to purge completely.

7.5.2 Span CO

Channel

It is recommended that the instrument is spanned to target the desired

reading range (e.g. 5%); ideally this should not be a low level close to

zero.

1) If not already preset, enter the span target (i.e. certiﬁ ed

concentration of your calibration gas) by pressing “KEY 1” and then

entering the new desired value followed by ENTER. Then attach

the gas and open the regulator valve to allow the gas to ﬂ ow.

2) Press the “START” key and wait for the reading to stabilize. This

can take a couple of minutes. Ensure the pump is on (pump icon

appears in lower middle of screen when on).