Emerson Process Management OXYMITTER 4000 - Manual (Page 34)

Instruction Manual
IB-106-340C Rev. 4.1
July 2004
1-4 Description and Specifications Rosemount Analytical Inc. A Division of Emerson Process Management
Hazardous Area Oxymitter 4000
For systems with one or two Hazardous
Area Oxymitter 4000 units per combustion
process, an optional remote mounted SPS
4000 Single Probe Autocalibration
Sequencer can be used with each Hazard-
ous Area Oxymitter 4000 to provide auto-
matic calibration gas sequencing. The
sequencer performs autocalibrations based
on the CALIBRATION RECOMMENDED
signal from the Hazardous Area 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.
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 in-
trinsically safe version of the handheld
communicator.
3. Membrane keypad Figure 1-3 and
HART communication are standard.
To use the HART capability, you must
have either:
(a) HART Model 275/375 Communi-
cator.
(b) Asset Management Solutions
(AMS) software for the PC.
4. An optional Local Operator Interface
Figure 1-4 allows continual O
2
display
and full interface capability.
DIAGNOSTIC
ALARMS
TEST
POINTS
HEATER T/C
HEATER
02 CELL
CALIBRATION
CALIBRATION RECOMMENDED
02 CELL mV +
02 CELL mv -
HEATER T/C +
HEATER T/C -
INC INC
DEC DEC
HIGH
GAS
LOW
GAS
CAL
TEST GAS +
PROCESS -
% 02
MEMBRANE
KEYPAD
37260003
Figure 1-3. Membrane Keypad
37260004
Figure 1-4. Local Operator Interface (LOI)