Alarm Relays
There are three alarm relays and one fault relay in the Ultima X
Series Gas Monitors. The three alarm relays:
• Activate when the Monitor detects a gas concentration level that
exceeds setpoints
• Alarms 1, 2 and 3 generally default to 10%, 20% and 30%
of the full-scale reading and are set when the gas reading
is above these values.
• The Oxygen Model is a special case where:
• Alarm 1 is set to 19% oxygen and
activates below this setpoint
• Alarm 2 is set to 18% oxygen and
activates below this setpoint
• Alarm 3 is set to 22% oxygen and
activates above this setpoint.
• These default setpoints can be changed or verified via the
Ultima X Controller.
• See Ultima/Ultima X Controller and Calibrator
manual (P/N 813379).
• The Controller can also enable the
latching alarm function.
• Are factory-set to a de-energized position.
• All relay connections have a normally-open set of
contacts and a normally-closed set of contacts. These
contacts are labeled as NCD (normally-closed,
de-energized) or NCE (normally-closed, energized).
• The units are shipped with alarm relays factory-set to the
de-energized (non-alarm) position and the trouble relay
set to the energized (non-fault) position.
• Upon activation, the relay contacts change state and
remain changed for as long as:
• The alarm condition exists within the Ultima X Series
Gas Monitor or
• The latching mode is selected
(see "Note on Resetting Latched alarms with
Controller or Calibrator" in Chapter 2).
• These defaults can be changed or verified via the Ultima
Controller.
Appendix A, Internal Relay Option
A-7
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