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Emerson Process Management GmbH & Co. OHG 7-35
X-STREAM XE
Instruction Manual
HASXEE-IM-HS
10/2010
7
Maintenance & Procedures
7.4.4.2 Modbus Activated Calibrations Without Valves
7.4.4 Remote Calibration
Several Modbus commands allow to start
calibrations (
Chapter 9, List of Modbus
Commands).
If the analyzer does neither provide internal
valves nor digital inputs and outputs (for con-
trolling external valves), then the procedure
corresponds to the manual calibration, with
the Modbus commands replacing the manual
front panel button keypresses.
7.4.4.3 Modbus Activated Calibrations With Valves
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
7-20), with the Modbus commands replacing
the manual front panel button keypresses.
This means, the Modbus command imme-
diately starts the calculation. The operator
has to ensure in this moment, the proper gas
is applied and the measuring system is lled
with calibration gas. If applicable, he also has
to take care to not activate a span calibration
without a preceding zero calibration.
For detailled instructions about manual cali-
bration
7-17.
This means, Modbus commands can in-
itialize
• 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.