MSA Ultima X Series Installation & Maintenance Instructions

2-2
NOTE: The catalytic combustible model of the Ultima X Series Gas
Monitors is capable of detecting concentrations of certain com-
bustible gases above 100% LEL. When exposed to these con-
centrations, the Ultima X Series Gas Monitors will display one
of two modes:
• +LOC % LEL - The Ultima X Series Gas Monitor has been
exposed to a high concentration of gas (above the LEL) and it
is possible that the over-range condition may still exist.
• OVER % LEL - The Ultima X Series Gas Monitor has been
exposed to a high concentration of gas (above the LEL) and
the over-range condition definitely still exists.
In either mode, correct the condition causing the excessive
gas level and vent or purge the area before attempting the
following.
In the +LOC % LEL mode, the output signal will also be
locked at full-scale. If this condition occurs, the Ultima X
Series Gas Monitor must be unlocked by performing a
"Zero Function" with the Ultima X Series Gas Monitor
Calibrator or Controller. The Ultima X Series Gas Monitor
will not revert to a normal condition until a successful zero
operation has been performed. This is an exclusive safety
feature of the Ultima X Series Gas Monitor which pre-empts
the possibility of ambiguous readings when the sensor is
exposed to concentration of gas above 100% LEL
In the OVER % LEL mode, the combustible gas is over
the100%LEL range. It returns to normal operation when
gas concentration level falls below 100%LEL.
Table 2-1. Instrument Operation
NOTES:
1
ALERT option causes the 4-20 mA output to be set to 3.75 mA during O
2
sensor
calibration (if the Cal Signal Option is also enabled). If the ALERT option is disabled and
the Cal Signal enabled, the output is set to 21 mA during the O
2
sensor calibration.
2
Swap Delay timeout is 60 seconds if enabled; 0 seconds otherwise.
3
The Swap Delay feature enables a one-minute hold-off of the Sensor Missing Fault,
allowing the user to "Swap" or change sensors without having the 4-20 mA set to a
fault condition.
4
Alarming operation are followed if the alarms are enabled.
"
CAUTION

MSA Ultima X Series Specifications

General

Brand	MSA
Model	Ultima X Series
Category	Measuring Instruments
Language	English