Emerson Rosemount Oxymitter 4000 Reference Manual page 67

July 2018
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, Emerson recommends
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, modes 0 through 7 are the alarm modes. The factory
default is mode 5 for Hazardous Area Oxymitter 4000 units without an IMPS 4000 or SPS
4001B. In this mode, the output will signal when a unit alarm or a CALIBRATION
RECOMMENDED indication occurs.
Calibration Handshake Signal
If using an optional IMPS 4000 or SPS 4001B, the logic I/O must be configured for
calibration handshaking. Of the ten modes in Table 4-1 only modes 8 and 9 are
configured for calibration handshaking. For a Hazardous Area Oxymitter 4000 with an
IMPS 4000 or an SPS 4001B, 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 RECOMMENDED
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
3 The unit is configured for both a Unit Alarm and Low O
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
7 The unit is configured for a Unit Alarm, a Low O
The unit is configured for a calibration handshake with IMPS 4000 or SPS 4001B. CALIBRATION
8**
RECOMMENDED will initiate the calibration cycle.
The unit is configured for a calibration handshake. CALIBRATION RECOMMENDED will not initiate the
9
calibration cycle with the IMPS 4000 or SPS 4001B.
* The default condition for a Hazardous Area Oxymitter 4000 without an IMPS 4000 or SPS
4001B.
** The default condition for a Hazardous Area Oxymitter 4000 with an IMPS 4000 or SPS
4001B
Note: The calibration recommended alarm was discontinued in 2014. It is still available in
the Model 6888 product.
Configuration with LOI
.
2
.
2
and High AC Impedance/CALIBRATION RECOMMENDED.
2
, and a High AC Impedance/CALIBRATION RECOMMENDED.
2
Rosemount Oxymitter 4000
67