MSA Ultima XA - Page 25

Table 2-1. Instrument Operation
OPERATION
LEDs
4 to 20 mA FAULT RELAY
GREEN RED
NORMAL NO
ALARMS
ON
steady
OFF Gas value Energized
ALARMING
OFF Flashing Gas value Energized
FAULT
OFF
ON
steady
3.0 mA De-energized
POWER UP/
COUNTDOWN
OFF
ON
steady
ALERT option
1
disabled:
21.0 mA for O
2
;
3.75 mA for others
Energized if ALERT
option disabled
ALERT option
1
enabled:
3.75 mA for all
De-energized if
ALERT option
enabled
1
SENSOR
MISSING/
COUNTDOWN
OFF
ON
steady
3.0 mA if SWAP
delay timeout
2
expired, SWAP
Delay
3
disabled or
FAULT
De-energized if
SWAP delay
timeout
2
expired,
SWAP delay
3
disabled or FAULT
Previous gas value
if SWAP delay
3
enabled and SWAP
delay timeout
2
not
expired
Energized if swap
delay
3
enabled and
SWAP delay
timeout
2
not expired
SENSOR CAL
OFF
ON
steady
3.75 mA if cal
signal enabled and
ALERT option
1
enabled; gas value
if cal signal disabled
Energized if ALERT
option disabled
21.0 mA for O
2
if
cal signal enabled
and ALERT option
1
disabled
De-energized if
ALERT option
enabled
1
CAL 4-20
OFF
ON
steady
4 mA if 4 mA
calibration selected
Energized if ALERT
option disabled
20 mA if 20 mA
calibration selected
De-energized if
ALERT option
enabled
1
CAL FAULT
OFF
ON
steady
Gas value
De-energized two
seconds every
minute
UNDERRANGE
OFF
ON
steady
3.0 mA if gas value
0 or less; gas value
otherwise
De-energized
OVERRANGE/
LOC
ON
steady
4
OFF
4
21.0 mA Energized
NOTES:
1
See Controller/Calibrator manual for ALERT option
2
Swap Delay timeout is 60 seconds if enabled; 0 seconds otherwise
3
See Controller/Calibrator manual for SWAP Delay option
4
Alarming operation will be followed if the alarms are enabled
Chapter 2, Start-up and Calibration
2-3