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Emerson Process Management GmbH & Co. OHG 7-35
X-STREAM X2
Instruction Manual
HASX2E-IM-HS
02/2012
7
Maintenance & Procedures
7.4.4.3 Modbus Activated Calibrations With Valves
7.4.4 Remote Calibrations
Several Modbus commands allow to start
calibrations (
Chapter 9, List of Modbus
Commands).
If the analyzer provides either internal valves
or digital inputs and outputs (for controlling
external valves), then Modbus commands
allow to make use of all the options described
in section 7.3.3 "Advanced Calibration" (page
7-18), with the Modbus commands replacing
the manual front panel button keypresses.
This means, Modbus commands can initialize
• Zero calibrate all channels
• Span calibrate all channels
• Zero and span calibrate all channels.
The analyzer controls the gas ow, if appli-
cable optimizes the sequence of multiple
calibrations and takes care to not activate
a span calibration without a preceding zero
calibration.