Emerson Process Management IM-106-340 instruction manual Alarm Contacts, Diagnostic LEDs

Oxymitter 4000

Instruction Manual

IM-106-340, Rev. 4.0 May 2006

NOTE

Make sure that the Control System is configured to interpret these signal levels correctly!

Once an alarm condition is indentified, the Oxymitter 4000 electronics offers a number of diagnostics to interpret the specific alarm.

If the Oxymitter 4000 has the simple keypad operator interface, the majority of fault conditions will be indicated by one of the four LEDs referred to as diagnostic, or unit alarms on the operator's keypad (Figure 8-2). An LED will flash a code that will correspond to an error message. Only one LED will blink at a time. An alarm code guide is provided inside the screw-on cover for the electronics.

Alarm indications will also be available via the optional LOI or the HART Model 275/375 hand-held communicator and Rosemount Analytical's Asset Management software. When the error is corrected and/or power is cycled, the diagnostic alarms will clear or the next error on the priority list will appear.

Figure 8-2. Diagnostic LEDs

Diagnostic

LEDs

HEATER T/C

DIAGNOSTIC HEATER

ALARMS 02 CELL

CALIBRATION

CALIBRATION RECOMMENDED

	02 CELL mV +
TEST	02 CELL mv -
POINTS	HEATER T/C +
	HEATER T/C -

INC INC

HIGH LOW GAS GAS

DEC DEC

CAL

TEST GAS + PROCESS -

% 02

37260044

ALARM CONTACTS

If autocalibration is not utilized, a common bidirectional logic contact is pro- vided for any of the diagnostic alarms listed in Table 8-1. The assignment of alarms which can actuate this contact can be modified to one of seven addi- tional groupings (mode 0 through mode 7) listed in Table 7-1.

The logic contact is self-powered, +5 VDC, with a 340 ohm series resistance. An interposing relay will be required if this contact is to be utilized to annunci- ate a higher voltage device, such as a light or horn. An interposing relay may also be required for certain DCS input cards.

8-4