![background image](http://html.mh-extra.com/html/emerson/rosemount-975hr/rosemount-975hr_reference-manual_104225024.webp)
In each state, the detector activates different outputs, as specified in
.
Table 1-8: Output Signals vs. Detector State
Detector state LED indicator
LED mode
Alarm relay
Auxiliary relay Fault relay
mA output
Normal
Green
1 Hz
Off
Off
On
4 mA
Warning
Red
2 Hz
Off
On
16 mA
Alarm
Red
Constant
On
On
On
20 mA
Red
Constant
On
Off
On
20 mA
On
20 mA
Yellow
4 Hz
Off
Off
Off
2 mA
Warning at BIT
Fault
Red
2 Hz
Off
Off
16 mA
Alarm at BIT
Fault
Red
Constant
On
On
Off
20 mA
Fault
Yellow
4 Hz
Off
Off
Off
0 mA
(1)
The auxiliary relay can be activated at the
Warning
level or
Alarm
level, depending on programmed function.
(2)
The alarm outputs are activated while alarm conditions exist and will stop approximately five seconds after a fire is no
longer detected.
(3)
The
Alarm
state can be optionally latched via programmed function. (Default is non-latching).
(4)
The detector will remain in
BIT Fault
state until it has passed a successful built-in test.
Note
The outputs depend on the output configurations.
Optional latching
Alarms are set as non-latching by default. However, the detector includes a latched alarm
output capability, which operates according to the programmed function.
If selected, upon detection of a fire, the detection signal is latched until the operator
manually resets the detector (disconnecting the power supply or performing a manual
built-in test [see
]).
Latching affects the alarm relay, 0-20 mA output, and the alarm LED. The auxiliary relay is
latched only when the programmable function
Auxiliary Relay
is set to Yes.
NOTICE
The auxiliary relay is available only in models with output configurations - 1RXXXXX and
2RXXXXX.
The 0-20 mA is available only in models with output configurations - 1AXXXXX, 2AXXXXX,
and 3AXXXXX.
Introduction
Reference Manual
June 2021
00809-0100-4976
24
Emerson.com/Rosemount
Legacy
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