Emerson Oxymitter 4000 Specifications download pdf (Page 101)

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

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.

2. Semi-Automatic Calibration. Semi-

automatic calibrations only require operator

initiation. However, the calibration gases

must be permanently 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 pa-

rameter of the CHANGE PRESETS

display mode from 0000 to 0001. Refer

to the IMPS 4000 Intelligent Multi-

probe 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 auto-

matic control loops can be placed in manual.

Then, the sequencer 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).

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