Operation
For details please see Chapter 5 |.
IMPORTANT: All the details given in Chapter 5 | regarding the operation of
the are valid for a HART supported unit. This section only provides
the details on operation of HART interface.
Initial Start-up
The HART 4-20mA interface is
disabled during the initial start-up
after the is powered up.
During the initial start-up, the
connected sensors are detected and
initialized. The initial start-up mode
lasts for approximately 45 seconds.
Figure A - 8 Main Unit Start-up Display
Warm-up Mode
After the initial start-up, the
enters the warm-up mode which
lasts for three minutes. During the
warm-up mode, all gas reading
related alarms are disabled, the
current on the HART 4-20mA
channel remains fixed at 3mA (16mA
for oxygen sensor) and the HART
interface is enabled for
communication.
Figure A - 9 Warm-up Display
Normal Mode
After the warm-up mode, the
enters the normal gas reading mode,
During the normal mode, all gas
reading related alarms are enabled
and the current on the HART 4-20mA
channel linearly follows the sensor 1
gas reading between zero reading to
measurement range with 4mA and
20mA being the corresponding
current values. In case of an under
range or an over range reading the
channel current value is fixed at
1mA. HART interface is enabled
throughout the normal mode.
Figure A - 10 Normal Mode Display
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