Emerson Process Management OXYMITTER 4000 instruction manual Alarm Indications

Instruction Manual

IB-106-340C Rev. 4.1 July 2004

Hazardous Area Oxymitter 4000

d.

When flowing calibration gasses, the raw

work loose. Before troubleshooting the

cell millivolt value at test points 1 and 2

system, ensure all ICs are fully seated.

should represent the levels on the chart in

Figure 8-1.Note that the raw cell millivolt

d. Electrostatic Discharge

value increases logarithmically as the O2

Electrostatic discharge can damage the ICs

concentration decreases.

used in the electronics. Before removing or

handling the processor board or the ICs,

ensure you are at ground potential.

Install all protective equipment covers

8-3 ALARM INDICATIONS

and safety ground leads after trouble-

shooting. Failure to install covers and

The majority of the fault conditions for the

ground leads could result in serious

injury or death.

Hazardous Area Oxymitter 4000 will be indi-

cated by one of the four LEDs referred to as

diagnostic, or unit alarms on the operator’s key-

8-2 GENERAL

pad (Figure 8-2). An LED will flash a code that

will correspond to an error message. Only one

The troubleshooting section describes how to

LED will blink at a time. An alarm code guide

identify and isolate faults that may develop in

is provided inside the screw-on cover for the

the Hazardous Area Oxymitter 4000. When

electronics.

troubleshooting, reference the following.

Alarm indications will be also available via the

a.

Grounding

optional LOI or the HART Model 275/375 hand-

It is essential that adequate grounding pre-

held communicator and Rosemount’s Asset

Management software. When the error is cor-

cautions are taken when installing the sys-

rected and/or power is cycled, the diagnostic

tem. Thoroughly check both the probe and

alarms will clear or the next error on the priority

electronics to ensure the grounding quality

list will appear.

has not degraded during fault finding. The

system provides facilities for 100% effective

DIAGNOSTIC

grounding and the total elimination of

LEDS

ground loops.

b.

Electrical Noise

HEATER T/C

The Hazardous Area Oxymitter 4000 has

DIAGNOSTIC

HEATER

ALARMS

02 CELL

been designed to operate in the type of

CALIBRATION

environment normally found in a boiler room

CALIBRATION RECOMMENDED

or control room. Noise suppression circuits

02 CELL mV +

are employed on all field terminations and

TEST

02 CELL mv -

main inputs. When fault finding, evaluate

POINTS

HEATER T/C +

the electrical noise being generated in the

HEATER T/C -

immediate circuitry of a faulty system.

INC

INC

Ensure all cable shields are connected to

CAL

earth.

GAS

GAS

HIGH

LOW

TEST GAS +

c.

Loose Integrated Circuits

DEC

DEC

PROCESS -

% 02

The Hazardous Area Oxymitter 4000 uses a microprocessor and supporting integrated circuits (IC). If the electronics are handled roughly during installation or located where subjected to severe vibration, the ICs could

37260044

Figure 8-2. Diagnostic LEDs

8-2 Troubleshooting Rosemount Analytical Inc. A Division of Emerson Process Management