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Instruction Manual
IB-106-340 Rev. 2.4
April, 2001
3-4 Startup Rosemount Analytical Inc. A Division of Emerson Process Management
Oxymitter 4000
3-2 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. The
ten different modes available are explained in
Table 3-1.
a. Alarm
When configured as an alarm, this signal
alerts you to an out-of-spec condition. The
output is 5 V in series with a 340 ohm re-
sistor. For optimum performance, Rose-
mount recommends connecting the output
to a Potter & Bromfield 3.2 mA DC relay
(P/N R10S-E1Y1-J1.0K).
Of the ten modes in Table 3-1, modes 0
through 7 are the alarm modes. The factory
default is mode 5 for Oxymitter 4000 units
without an IMPS 4000 or SPS 4000. In this
mode, the output will signal when a unit
alarm or a CALIBRATION RECOM-
MENDED 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 3-1, only modes 8 and 9 are con-
figured for calibration handshaking. For an
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 Oxymit-
ter 4000 and sequencer and to signal the
sequencer when a CALIBRATION REC-
OMMENDATION indication occurs.
Table 3-1. Logic I/O Configuration
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 Impedance/
CALIBRATION RECOMMENDED.
6 The unit is configured for both a Low O
2
and High AC Impedance/CALIBRATION
RECOMMENDED.
7 The unit is configured for a Unit Alarm, a Low O
2
, and a High AC Impedance/
CALIBRATION RECOMMENDED.
8** The unit is configured for a calibration handshake with IMPS 4000 or SPS 4000.
CALIBRATION RECOMMENDED will initiate the calibration cycle.
9 The unit is configured for a calibration handshake. CALIBRATION RECOM-
MENDED will not initiate the calibration cycle with the IMPS 4000 or SPS 4000.
*The default condition for an Oxymitter 4000 without an IMPS 4000 or SPS 4000.
**The default condition for an Oxymitter 4000 with an IMPS 4000 or SPS 4000.