Emerson Process Management OXYMITTER 4000 - Manual (Page 76)

Instruction Manual
IB-106-340C Rev. 4.1
July 2004
5-2 Startup and Operation with Keypad Rosemount Analytical Inc. A Division of Emerson Process Management
Hazardous Area Oxymitter 4000
d. Keypad
The five membrane keys on the membrane
keypad are only used during calibration to
adjust the high and low gas and to initiate
the calibration sequence (Figure 5-2).
e. Reference Air
Ensure reference air, if used, is set to 56.6
l/hr (2 scfh).
5-2 OPERATION
a. Overview
Ensure the Hazardous Area Oxymitter 4000
is at normal operation. The diagnostic LEDs
will display the operating cycle. All other
LEDs should be off (See Figure 5-3).
1. DIAGNOSTIC ALARM LEDS. If there
is an error in the system, one of these
LEDs will flash various blink codes
(see Section 8, TROUBLESHOOT-
ING). In the case of multiple errors,
only one will be displayed based on a
priority system. Correct the problem
and cycle power. The operating display
will return or the next error will be dis-
played. The alarms are:
HEATER T/C
HEATER
O
2
CELL
CALIBRATION
2. CALIBRATION RECOMMENDED
LED. Turns on when the system
determines that a calibration is recom-
mended. Further information is avail-
able in Section 9, MAINTENANCE
AND SERVICE.
3. TEST POINTS. Test points 1 through 6
allow you to monitor with a multimeter:
the heater thermocouple, the O
2
cell
millivolt value, and the process O
2
.
(a) TP1 and TP2 monitor the oxygen
cell millivolt output, which equates
to the percentage of oxygen
present.
(b) TP3 and TP4 monitor the heater
thermocouple.
(c) TP5 and TP6 monitor the process
gas or the calibration gas
parameter.
DIAGNOSTIC
ALARMS
TEST
POINTS
HEATER T/C
HEATER
02 CELL
CALIBRATION
CALIBRATION RECOMMENDED
02 CELL mV +
02 CELL mv -
HEATER T/C +
HEATER T/C -
INC INC
DEC DEC
HIGH
GAS
LOW
GAS
CAL
TEST GAS +
PROCESS -
% 02
MEMBRANE
KEYS
MEMBRANE
KEYS
MEMBRANE
KEY
DIAGNOSTIC
LEDS
22220023
Figure 5-2. Calibration Keys