Rosemount Oxymitter 4000, Instruction Bulletin

Page: 88 / 127

IB-106-340
6-3
DIAGNOSTIC
ALARMS
TEST
POINTS
HEATER T/C
HEATER
O2 CELL
CALIBRATION
CALIBRATION RECOMMENDED
O2 CELL mV +
O2 CELL mv -
HEATER T/C +
HEATER T/C -
INC INC
DEC DEC
HIGH
GAS
LOW
GAS
CAL
TEST GAS +
PROCESS -
% O2
22220067
Figure 6-2. Membrane Keypad
(c) If using an IMPS 4000, enter a time
interval via the IMPS 4000 keypad that
will initiate an automatic calibration at a
scheduled time interval (in hours). To
set the CalIntvX parameter of the
CHANGE PRESETS display mode, re-
fer to the IMPS 4000 Intelligent Multi-
probe Test Gas Sequencer Instruction
Bulletin for more information.
Once an automatic calibration is initiated, by
any of the methods previously described, the
Oxymitter 4000’s CALIBRATION RECOM-
MENDED alarm signals an IMPS 4000 or
SPS 4000 to initiate a calibration. The se-
quencer sends an “in cal” signal to the control
room so that any automatic control loops can
be placed in manual. Then, the sequencer
begins to sequence the calibration gases.
2. Semi-Automatic Calibration. Semi-automatic
calibrations only require operator initiation.
However, the calibration gases must be per-
manently piped to the Oxymitter 4000, an
SPS 4000 or IMPS 4000 must be installed to
sequence the gases, and the Oxymitter 4000’s
logic I/O must be set to mode 8 or 9 via
HART/AMS so the sequencer and Oxymitter
4000 can communicate.
Depending on your system setup, a semi-
automatic calibration can be initiated by the
following methods:
(a) Oxymitter 4000. Press the CAL key on
the Oxymitter 4000 keypad.
(b) IMPS 4000. Use the IMPS 4000
keypad to change the InitCalX parame-
ter of the CHANGE PRESETS display
mode from 0000 to 0001. Refer to the
IMPS 4000 Intelligent Multiprobe Test
Gas Sequencer Instruction Bulletin for
more information.
(c) HART. Use the HART Communicator
to access the O
2
CALIBRATE menu
and perform the O
2
CAL method. Refer
to paragraph 7-7 for the complete cali-
bration procedure.
(d) AMS. Refer to AMS documentation for
more information.
(e) Remote Contact. Initiate a calibration
from a remote location via the remote
contact input connection provided by an
IMPS 4000 or SPS 4000. Refer to the
documentation available for the control
system in use for more information.
Once a semi-automatic calibration is initiated,
by any of the methods previously described,
the Oxymitter 4000’s CALIBRATION
RECOMMENDED alarm signals an IMPS
4000 or SPS 4000 to initiate a calibration.
The sequencer sends an “in cal” signal to the
control room so that any automatic control
loops can be placed in manual. Then, the se-
quencer begins to sequence the calibration
gases.
3. Manual Calibration. Manual calibrations
must be performed at the Oxymitter 4000 site
and require operator intervention throughout
the process.
Manual calibration instructions can also be
found, in condensed form, on the inside of the
right electronics housing cover (Figure
6-3).