TELEDYNE OLDHAM SIMTRONICS iTRANS 2 - A.4 HART Operation

iTRANS 2
FIXED POINT SINGLE OR DUAL GAS MONITOR
WITH DUAL ANALOG OUTPUTS
USER MANUAL
52
77036429-EN
Revision 7.0
IMPORTANT: In 4, the “Digital ModBus RTU Interface Wiring” section is not applicable for HART
supported as ModBus interface is not available on HART supported unit.
A.5 Operation
For details please see 0.
IMPORTANT: All the details given in 0 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. Dur
ing 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