Emerson Process Management OXYMITTER 4000 - Manual (Page 72)

Instruction Manual
IB-106-340C Rev. 4.1
July 2004
4-4 Configuration with LOI Rosemount Analytical Inc. A Division of Emerson Process Management
Hazardous Area Oxymitter 4000
The HART option is not protected by
energy limiting barriers. It must not be
interfaced from within the hazardous
area. The 4-20 mA cables should be
routed and the connections made out-
side the hazardous area. Note that this
is the case even when using the intrin-
sically safe version of the handheld
communicator.
4-2 LOGIC I/O
This two-terminal logic contact can be config-
ured either as a solid-state relay-activated alarm
or as a bi-directional calibration handshake sig-
nal to an IMPS 4000 or SPS 4000. The configu-
ration of this signal depends on the setting of
the LOGIC I/O PIN MODE via HART/AMS or
LOI. The ten different modes available are
explained in Table 4-1.
a. Alarm
When configured as an alarm, this signal
alerts you to an out-of-spec condition. The
output is +5 Vdc in series with a 340 ohm
resistor.
For optimum performance, Rosemount rec-
ommends connecting the output to a Potter
& Brumfield 3.2 mA DC relay (P/N R10S-
E1Y1-J1.0K).
Of the ten modes in Table 4-1, mode 1
through mode 7 are the alarm modes. The
factory default is mode 5 for Hazardous
Area Oxymitter 4000 units without an IMPS
4000 or SPS 4000. In this mode, the output
will signal when a unit alarm or a CALIBRA-
TION RECOMMENDED indication occurs.
b. Calibration Handshake Signal
If using an optional IMPS 4000 or SPS
4000, the logic I/O must be configured for
calibration handshaking. Of the ten modes
in Table 4-1, only modes 8 and 9 are con-
figured for calibration handshaking. For a
Hazardous Area Oxymitter 4000 with an
IMPS 4000 or an SPS 4000, the factory
sets the default to mode 8. In this mode,
the logic I/O will be used to communicate
between the Hazardous Area Oxymitter
4000 and the sequencer and to signal the
sequencer when a CALIBRATION REC-
OMMENDED indication occurs.
Table 4-1. Logic I/O Configuration (as set at HART/AMS or LOI)
Mode Configuration
0 The unit is not configured for any alarm condition.
1 The unit is configured for a Unit Alarm.
2 The unit is configured for Low O
2
.
3 The unit is configured for both a Unit Alarm and Low O
2
.
4 The unit is configured for a High AC Impedance/CALIBRATION
RECOMMENDED.
5* The unit is configured for both a Unit Alarm and a High AC Imped-
ance/CALIBRATION RECOMMENDED.
6 The unit is configured for both a Low O
2
and High AC Imped-
ance/CALIBRATION RECOMMENDED.
7 The unit is configured for a Unit Alarm, a Low O
2
, and a High AC Im-
pedance/CALIBRATION RECOMMENDED.
8** The unit is configured for a calibration handshake with IMPS 4000 or
SPS 4000. CALIBRATION RECOMMENDED will initiate the calibra-
tion cycle.
9 The unit is configured for a calibration handshake. CALIBRATION
RECOMMENDED will not initiate the calibration cycle with the IMPS
4000 or SPS 4000.
* The default condition for a Hazardous Area Oxymitter 4000 without an IMPS 4000 or SPS 4000.
** The default condition for a Hazardous Area Oxymitter 4000 with an IMPS 4000 or SPS 4000.