Filter
Top Products
Emerson Process Management GmbH & Co. OHG 7-31
X-STREAM X2
Instruction Manual
HASX2E-IM-HS
02/2012
7
Maintenance & Procedures
7.4.4 Remote Calibrations
Remote calibrations may be initialized by di-
gital inputs or Modbus commands, whereas
both offer different functionalities:
Remote calibration via digital inputs (option)
is feasible only in combination with internal or
external valves and is limited to 3 procedures,
to be assigned to any digital input: Zero cali-
brate all channels (ZeroAll), span calibrate all
channels (SpanAll) and zero & span calibrate
all channels (ZSCalAll).
Note!
By activating span calibrations, it is the ope-
rators responsibility to not perform a span ca-
libration without a preceding zero calibration!
The Modbus interface offers more variability
in performing calibrations:
• Calibration without valves:
The Modbus command initializes the
procedure within the analyzer, but the
operator has to take care that the gases
are supplied in proper order, has to con-
sider purge times as well as the condition
to not perform a span calibration without
a preceding zero calibration. So, in this
conguration Modbus may be used e.g.
together with an external sample hand-
ling system that controls the gas ow.
• Calibration with valves:
Installed and assigned valves ( 7.3.1.1,
page 7-19) support two different variati-
ons of how to perform calibrations:
1. Perform single calibrations
The Modbus command initializes single
procedures (zero or span calibrations).
The analyzers controls gas supply and
purge times while it is the operators
responsibility to not activate a span
calibration without a preceding zero
calibration!
2. Special calibration procedures:
• Zero calibrate all channels
• Span calibrate all channels
• Zero & span calibrate all channel.
Initialized by the Modbus command the
analyzer performs above mentioned
procedures and controls gas supply,
purge times and (for the last given pro-
cedure only) performs a zero calibra-
tion for all channels before activating
span calibrations.
For detailled descriptions on how to perform
calibrations initialized via digital inputs 7.4.4.1, page 7-30
calibrations initialized via Modbus, without valves 7.4.4.2, page 7-32
calibrations initialized via Modbus, with valves 7.4.4.3, page 7-33
7.4.4 Remote Calibration