Emerson OXYMITTER 4000 - Manual (Page 39)

Instruction Manual
IB-106-340 Rev. 3.0
December 2003
Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications 1-3
Oxymitter 4000
c. System Configuration
Oxymitter 4000 units are available in seven
length options, giving the user the flexibility
to use an in situ penetration appropriate to
the size of the stack or duct. The options on
length are 18 in. (457 mm), 3 ft (0.91 m), 6 ft
(1.83 m), 9 ft (2.7 m), 12 ft (3.66 m), 15 ft
(4.57 m), and 18 ft (5.49 m).
The electronics control probe temperature
and provide an isolated output, 4-20 mA,
that is proportional to the measured oxygen
concentration. The power supply can accept
voltages of 90-250 VAC and 48/62 Hz;
therefore, no setup procedures are re-
quired. The oxygen sensing cell is main-
tained at a constant temperature by
modulating the duty cycle of the probe
heater portion of the electronics. The elec-
tronics accepts millivolt signals generated
by the sensing cell and produces the out-
puts to be used by remotely connected user
devices. The output is an isolated 4-20 mA
linearized current.
The Oxymitter 4000 transmitter is available
with an integral or remote electronics pack-
age. Two calibration gas sequencers are
available: the IMPS 4000 and the SPS 4000
(Figure 1-2).
Systems with multiprobe applications may
employ an optional IMPS 4000 Intelligent
Multiprobe Test Gas Sequencer. The IMPS
4000 provides automatic calibration gas se-
quencing for up to four Oxymitter 4000 units
and accommodates autocalibrations based
on the CALIBRATION RECOMMENDED
signal from the Oxymitter 4000, a timed in-
terval set up in HART or the IMPS 4000, or
whenever a calibration request is initiated.
For systems with one or two Oxymitter 4000
units per combustion process, an optional
SPS 4000 Single Probe Autocalibration Se-
quencer can be used with each Oxymitter
4000 to provide automatic calibration gas
sequencing. The SPS 4000 can be
mounted directly to the Oxymitter 4000 or in
a remote location if space is limited. The
sequencer performs autocalibrations based
on the CALIBRATION RECOMMENDED
signal from the Oxymitter 4000, a timed in-
terval set up in HART, or whenever a cali-
bration request is initiated.
d. System Features
1. The CALIBRATION RECOMMENDED
feature detects when the sensing cell is
likely out of limits. This may eliminate
the need to calibrate on a “time since
last cal” basis.
2. The cell output voltage and sensitivity
increase as the oxygen concentration
decreases.
OXYMITTER 4000
IMPS 4000
(1 TO 4 PROBES)
REMOTE MOUNTED
SPS 4000
(1 PROBE)
INTEGRALLY
MOUNTED
SPS 4000
(1 PROBE)
INTEGRAL OR
REMOTE
37260039
Figure 1-2. Oxymitter 4000 Autocalibration
System Options