MSA Ultima X Series Safety Manual

Chapter 2,
Using the Ultima X Series Gas Monitors
Safety Function
The safety function of the Ultima X Gas Monitor is to:
• monitor gas concentration
• update outputs based on this monitoring.
• The outputs consist of:
• an analog output that reflects the gas concentration
• three alarm relay outputs
• one fault relay output.
• The analog output is a scaled 4-20 mA output value where:
• 4 mA represents 0% of range and
• 20 mA represents 100% of range.
• The alarm relay outputs allow for three independent,
configurable alarms which energize or de-energize
the coil when gas concentration exceeds the configurable
threshold values.
Safety Integrity Level
The Ultima X Gas Monitor is certified to meet the requirements of
Safety Integrity Level (SIL) 2 according to IEC 61508: 2010 for use in
low demand applications only.
• Oxygen, catalytic combustible and IR gases are SIL 2 w/ HFT = 0
(Hardware Fault Tolerance).
• Toxic gases are SIL 2 w/ HFT = 1 and SIL 1 w/ HFT = 0.
Safety Accuracy
The Ultima X Gas Monitor has a safety accuracy of 10%. This means
that internal component failures are listed in the device failure rate
if these failures cause an error of 10% or greater.
2-1

MSA Ultima X Series Specifications

General

Brand	MSA
Model	Ultima X Series
Category	Measuring Instruments
Language	English