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Emerson Process Management GmbH & Co. OHG 7-5
X-STREAM X2
Instruction Manual
HASX2E-IM-HS
02/2012
7
Maintenance & Procedures
7.4 Calibration Procedures
7.4 Calibration Procedures
Note!
To achieve best and proper measuring results
it is recommended to perform zero and span
calibrations on a regular weekly basis.
Also a zero calibration must always precede
a span calibration!
Zero calibration
To perform a zero calibration supply either
Nitrogen (N2) or another suitable zero gas
[conditioned ambient air or industrial air (NOT
for Oxygen measurement!)] to the gas path.
Span calibration
Supply span gases with concentrations of
80 % to 110 % of the upper measuring range
limit to the gas path. Using lower concentra-
tions may decrease accuracy when measu-
ring above the span gas concentration!
If the Oxygen concentration is known, ambient
air may be used for an Oxygen channel span
calibration.
X-STREAM gas analyzers support several
calibration procedures:
Manual calibration
Typically a calibration procedure is carried out
manually by supplying the gases sequentially
by hand and activating the procedures via
front panel keys.The operator has to take
care to consider purge times and supply the
proper gases in correct order.
It is the operators responsibility to not perform
a span calibration without a preceding zero
calibration!
Advanced calibration
Advanced calibration is a more comfortable
variation of manual calibration, providing ONE
KEY calibrations supported by internal and/
or external valves. The analyzer automatically
supplies the right gas and considers purge
times.
Remote calibration
Remote calibrations may be activated by
means of digital inputs or Modbus commands.
Calibrations activated via digital inputs re-
quire either internal or external valves to be
installed. Modbus supports both calibrations
with or without valves as well as calibration
sequences.
Unattended automatic calibration
Unattended automatic calibrations are activa-
ted utilizing the analyzer software time interval
setting:
After a specied time interval has elapsed,
the analyzer automatically carries out valve
supported zero or span calibrations.
The main advantage is that no user interaction
is required to start a calibration or during cali-
brations: The analyzer automatically supplies
the right gas, considers purge times and, that
a span calibration has to be preceded by a
zero calibration.
Before starting any calibration take care of
the next page´s table, and the subsequent
sections, describing general preparations for
calibration procedures and how to perform
such calibrations!
Furthermore you´ll find information about
calibration gases setup:
7.3.1, page 7-5
and valve assignment: 7.3.1.1, page 7.7.