Rosemount Oxymitter 4000, Инструкционный бюллетень

Страница: 34 / 127

IB-106-340
1-2
The integral electronics control probe temperature
and provide an isolated output, 4-20 mA, that is
proportional to the measured oxygen concentra-
tion. The power supply can accept voltages of 90-
250 VAC and 50/60 Hz; therefore, no setup
procedures are required. The oxygen sensing cell
is maintained at a constant temperature by
modulating the duty cycle of the probe heater
portion of the integral electronics. The integral
electronics accepts millivolt signals generated by
the sensing cell and produces the outputs to be
used by remotely connected devices. The output is
an isolated 4-20 mA linearized current.
Two calibration gas sequencers are available to the
Oxymitter 4000: 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 sequencing for up to four
Oxymitter 4000 units and accommodates
autocalibrations based on the CALIBRATION
RECOMMENDED signal from the Oxymitter
4000, a timed interval 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 Sequencer
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 interval
set up in HART, or whenever a calibration
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.
3. Membrane keypad and HART communica-
tion are standard. To use the HART capabil-
ity, you must have either:
(a) HART Model 275 Communicator.
(b) Asset Management Solutions
(AMS) software for the PC.
4. Field replaceable cell, heater, thermocouple,
and diffusion element.
5. The Oxymitter 4000 is constructed of rugged
316 L stainless steel for all wetted parts.
OXYMITTER 4000
IMPS 4000
(1 TO 4 PROBES)
REMOTE MOUNTED
SPS 4000
(1 PROBE)
(EXPLO VERSIONS MUST
BE REMOTE MOUNTED)
INTEGRALLY
MOUNTED
SPS 4000
(1 PROBE)
INTEGRAL OR
REMOTE
26170002
Figure 1-2. Oxymitter 4000 Autocalibration
System Options