Emerson Process Management OXYMITTER 4000 - Manual (Page 120)

Instruction Manual
IB-106-340C Rev. 4.1
July 2004
9-2 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management
Hazardous Area Oxymitter 4000
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
intrinsically safe version of the hand-
held communicator.
Do not install an IMPS 4000 or SPS
4000 within the hazardous area.
Installing the unit in a potentially
explosive environment could cause
serious injury or death and equipment
damage. Ensure the sequencer is
installed in a safe area.
1. Automatic Calibration. Automatic
calibrations require no operator action.
However, the calibration gases must
be permanently piped to the Hazard-
ous Area Oxymitter 4000, an SPS
4000 or IMPS 4000 must be installed
to sequence the gases, and the logic
I/O must be set to mode 8 via
HART/AMS so the sequencer and
Hazardous Area Oxymitter 4000 can
communicate.
Depending on your system setup, an
automatic calibration can be initiated
by the following methods:
(a) The Hazardous Area Oxymitter
4000’s CALIBRATION RECOM-
MENDED alarm signals that a
calibration is required.
(b) Use the HART/AMS or the LOI to
enter a “time since last cal” (CAL
INTRVL) parameter that will initiate
an automatic calibration at a
scheduled time interval (in hours).
To configure the CAL INTRVL
parameter, refer to paragraph 7-8
for the HART/AMS, or paragraph
6-5 for the LOI.
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 9-1. Membrane Keypad
(c) If using an IMPS 4000, enter a
time interval via the IMPS 4000
keypad that will initiate an auto-
matic calibration at a scheduled
time interval (in hours). To set the
CalIntvX parameter of the
CHANGE PRESETS display
mode, refer to the IMPS 4000
Intelligent Multiprobe Test Gas
Sequencer Instruction Bulletin for
more information.
Once an automatic calibration is initi-
ated, by any of the methods previously
described, the Hazardous Area Oxy-
mitter 4000’s CALIBRATION REC-
OMMENDED alarm signals an IMPS
4000 or SPS 4000 to initiate a calibra-
tion. The sequencer 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.