Output configuration notes
•
RS-485 is used for network communication, as specified in
, (terminals 10, 11, and 12) and to connect (in safe areas) to PC/laptop for
configuration/diagnostics.
•
Alarm relay
—
N.O. in output configuration 1A, 1R, and 2R
—
N.O. and N.C. in output configuration 2A and 3A
•
0-20 mA is Sink in output configuration 1A and Source in output configurations 2A and
3A.
•
0-20 mA output configurations 1A, 2A, and 3A are available with the HART
®
protocol.
•
In output configuration 1A, link terminals 1 and 8 to change the mA output to Source.
•
The fault output is N.C. energized SPST relay. The contacts are closed when the
detector is in its normal operational condition in output configurations 1A, 2A, and 1R
and available as N.O. energized in output configurations 3A and 2R.
•
The auxiliary output is N.O. energized (SPST) relay. The auxiliary relay may act in
parallel with the alarm relay to activate another external device, or it may provide a
warning signal, depending on the function configuration.
2.8
Configure the detector
You can reprogram the function setup using the RS-485 connection or using the HART
®
protocol as follows:
•
USB RS-485 harness kit (PN 00975-9000-0011): The USB RS-485 harness kit with
RS-485/USB converter, used with the Rosemount host software, enables you to
connect to any available PC or laptop to reconfigure settings or perform diagnostics on
all Rosemount 975 series flame detectors.
Refer to manual
00809-0300-4975
for programming instructions when using the USB
RS-485 harness kit.
•
HART protocol: Refer to manual
for programming instructions.
These functions enable you to set:
•
Sensitivity
•
Alarm delay
•
Address setup
•
Mode of operation
•
Heated optics operation
The factory default settings listed for each function are:
•
Sensitivity: 30
•
Alarm delay: A
•
Alarm latch: No
Reference Manual
Installing the detector
00809-0100-4975
August 2019
Rosemount 975MR
35
