5.1.2.10.1 Alarm-1 and Alarm-2 relays fail-safe
This parameter allows the user to set the Alarm-1 and Alarm-2 relays to either failsafe or non-
failsafe action. Failsafe action is defined as; relay coils are not powered (contacts are in normal
position) in active alarm state. Non-Failsafe action is defined as; relay coils are powered (contacts
are in non-normal position) in active alarm state. The Alarm-1 and Alarm-2 Relays Failsafe setting
may be set to “YES” or “NO”. This setting is accessed from the Alarm and Relay Setup Menu by
typing “1” or “F” on the RS-232 terminal.
5.1.2.10.2 Alarm-1 level setting (setpoint)
This setting sets the threshold level for Alarm-1. Depending on whether or not it is set to ascending
or descending, Alarm-1 becomes active when the oxygen concentration is above or below this
threshold level. The Alarm-1 setpoint may be set anywhere from 0 PPM to 2,000 PPM. This
setting is accessed from the Alarm Relay Setup Menu by typing “2” on the RS-232 terminal.
5.1.2.10.3 Alarm-1 descending
This setting configures Alarm-1 to either ascending or descending action. Ascending is defined as
Alarm-1 active when the oxygen concentration is above the Alarm-1 setpoint level. Descending is
defined as; Alarm-1 active when the oxygen concentration is below the Alarm-1 setpoint level. The
descending setting may be set to “YES” or “NO”. This setting is accessed from the Alarm and
Relay Setup Menu by typing “3” on the RS-232 terminal.
5.1.2.10.4 Alarm-2 level setting (setpoint)
This setting sets the threshold level for Alarm-2. Depending on whether or not it is set to ascending
or descending, Alarm-2 becomes active when the oxygen concentration is above or below this
threshold level. The Alarm-2 setpoint may be set anywhere from 0 PPM to 2,000 PPM. This
setting is accessed from the Alarm Relay Setup Menu by typing “4” on the RS-232 terminal.
5.1.2.10.5 Alarm-2 descending
This setting configures Alarm-2 to either ascending or descending action. Ascending is defined as
Alarm-2 active when the oxygen concentration is above the Alarm-2 setpoint level. Descending is
defined as; Alarm-2 active when the oxygen concentration is below the Alarm-2 setpoint level. The
descending setting may be set to “YES” or “NO”. This setting is accessed from the Alarm and
Relay Setup Menu by typing “5” on the RS-232 terminal.
5.1.2.10.6 Relay hold time
This setting determines the minimum time that Alarm-1 and Alarm-2 relays will hold their active
state once the Alarm-1 and Alarm-2 setpoint levels have been exceeded, regardless of the actual
Oxygen concentration after Alarm-1 and Alarm-2 have been activated. The Hold Time level may be
set anywhere from 0 to 300 seconds. This setting is accessed from the Alarm Relay Setup Menu
by typing “6” or “H” on the RS-232 terminal.
5.1.2.10.7 Fault relay active during warm-up
This setting determines the active status of the Fault relay during the Model 7100E warm-up routine
(section 4.3.1.2). The activate setting may be set to “YES” or “NO”. This setting is accessed from
the Alarm Relay Setup Menu by typing “7” or “W” on the RS-232 terminal.
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