Model 360E Instruction Manual Calibration Procedures
7. CALIBRATION PROCEDURES
This contains a variety of information regarding the various methods for calibrating a Model 360E CO2 Analyzer
as well as other supporting information.
NOTE
The procedures in this assume that the calibration password feature is disabled (the
instruments default state). If it is enabled a password prompt screen (See Section 6.9)
will appear after the CAL, CALZ or CALS buttons are pushed but before the instrument
enters the associated calibration mode.

7.1. Before Calibration

The calibration procedures in this assume that the Range Type, Range Span and units of measure have already
been selected for the analyzer. If this has not been done, please do so before continuing (See Section 6.8 for
instructions).
All Gas lines should be PTFE (Teflon), FEP, glass, stainless steel or brass.
NOTE
If any problems occur while performing the following calibration procedures, refer to
Chapter 11 of this manual for troubleshooting tips.

7.1.1. Zero Air and Span Gas

To perform the following calibration you must have sources for zero air and span gas available.
Zero Air is similar in chemical composition to the Earth’s atmosphere but scrubbed of all components that might
affect the analyzer’s readings. Zero air should contain less than 25 ppb of CO2 and other major interfering
gases such as CO and Water Vapor. It should have a dew point of -5C or less
Span Gas is a gas specifically mixed to match the chemical composition of the type of gas being measured at
near full scale of the desired measurement range. It is recommended that the span gas used have a
concentration equal to 80% of the full measurement range.
If Span Gas is sourced directly from a calibrated, pressurized tank, the gas mixture should be CO2 mixed with
Zero Air or N2 at the required ratio.
Zero air generators that condition ambient air by drying and removal of pollutants are available on the
commercial market such as the Teledyne Instruments Model 701 Zero Air Generator. We recommend this type
of device, in conjunction with a CO2 scrubber such as soda lime (such as Teledyne Instruments P/N
037600000), for generating zero air.
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