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Emerson Process Management GmbH & Co. OHG 7-3
Instruction Manual
HASAxE-IM-HS
05/2006
7 Maintenance
7-3 Calibration Procedures
7-3 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 Ni-
trogen (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 concen-
trations 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 procdures:
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.
Automatic calibration
Using optional internal or external solenoid
valves and digital outputs allows to carry out
calibration procedures automatically (auto
calibration): The operator activates the (zero
or span) calibration via software menu, digital
input or modbus interface command and the
analyzer controls the procedure for the selected
calibration (activating the valves to supply the
required gas and considering purge times)
without any additional operator interaction.
It is the operators responsibility to not perform
a span calibration without a preceding zero
calibration!
Unattended automatic calibration
Unattended automatic calibrations are
activated utilizing the analyzer software time
interval setting:
After a specified time interval has elapsed the
analyzer automatically carries out a zero or
span calibration.
The main advantage is that the analyzer
automatically considers, that a span calibration
has to be preceded by a zero calibration: It
always performs a zero calibration before
starting a time interval activated span
calibration!
Before starting calibrations take care of section
7-3-1. pg. 7-4, describing general preparations
for all kinds of calibration procedures!
The following sections describe in detail how
to carry out manual calibrations (
7-3-2,
pg. 7-7), advanced calibrations (
7-3-3, pg. 7-10), single automatic calibrations
( 7-3-4, pg. 7-20) and unattended
automatic calibrations ( 7-3-4-4, pg. 7-28).