Specifications

STARTUP and OPERATION
Rosemount Analytical µCEM Continuous Analyzer Transmitter 4-16
4.3.5 µCEM Settings-Calibration Gas
The Calibration Gas values and Gas Bottle allocation may be set on the Calibration Gas
page of the µCEM Settings. This should be set whenever a Calibration Gas container is
replaced or upon Startup of the system.
Calibration Gas Values:
R1Mid: This is typically used for CGA audits and not for daily calibrations. The specific
calibration gas mid value (typically between 40% to 60% of range) is set in this space.
The MicroCEM will perform mid calibration on Range 1 on this gas but will not perform
any corrections. This box should typically be left blank. It is mostly used as a check.
R1Span: The specific calibration gas span value (typically between 80% to 100% of
range) is set in this space for Range 1. A Nox range of 0-100ppm would typically use a
gas bottle with 90ppm NOx balance N2.
R2Mid: This is typically used for CGA audits and not for daily calibrations. The specific
calibration gas mid value (typically between 40% to 60% of range) is set in this space.
The MicroCEM will perform a mid calibration on Range 2 on this gas but will not perform
any corrections. This box should typically be left blank. It is mostly used as a check.
R2Span: The space is allocated for dual range applications. If the MicroCEM range
setting is set for single range then the user will not be able to input any value into this
space. The specific calibration gas span value (typically between 80% to 100% of
range) is set in this space. A Nox range of 0-10ppm would typically use a gas bottle with
9ppm NOx balance N2.
Note that zero values do not have to be input into this page. For all zero calibrations the
user must assure that the calibration gas used does not have any levels of the
measurement gas in the cylinder. For example upon the analyzer zeroing O2, the bottle
used must have 0% O2 in the Bottle. Zeroing the O2 is typically performed by using the
NOx or CO Span gases.
Gas Bottle Allocation:
Gas 1, Gas 2 and Gas 3 are labels for the respective location of where the calibration
gas cylinders are physically located on the external fittings.
Off: Designates that no operation will be performed.
Zero: The MicroCEM will perform a zero calibration.
R1Span: MicroCEM will perform a Span calibration for Range 1.
R2Span: MicroCEM will perform a Span calibration for Range 2. Note that if a second
range is NOT chosen in the range settings menu then user will not be able to input any
value into this space. Range 2 should always be a lower value than range 1 if used.
R1Mid: MicroCEM will perform a Mid Calibration for Range 1.
R2Mid: MicroCEM will perform a Mid Calibration for Range 2. Note that if a second
range is NOT chosen in the range settings menu then user will not be able to input any
value into this space.