
Alarm indications are also available via the optional LOI or the HART
®
handheld
communicator and Rosemount's
™
Asset Management software. When the error is
corrected and/or power is cycled, the diagnostic alarms will clear or the next error on the
priority list will appear.
8.4
Alarm contacts
If not using autocalibration, Emerson provides a common bi-directional logic contact for
any of the diagnostic alarms listed in
. You can modify the assignment of alarms
that can actuate this contact to one of seven additional groupings (mode 0 through mode
7) listed in
.
The logic contact is self-powered, +5 Vdc with a 340 ohm series resistance. An interposing
relay will be required if using this contact to annunciate a higher voltage device, such as a
light or horn. You may also need an interposing relay for certain DCS input cards.
A Potter & Brumfield R101-E1Y1-J1.0K 3.2 mA DC or an equal interposing relay will be
mounted where the contact wires terminate in the control/relay room.
If using autocalibration systems, the bi-directional logic contact is used as a "hand-shake"
signal between the autocalibration system (Rosemount
™
SPS 4001B or IMPS 4000) and is
unavailable for alarming purposes. The autocalibration systems provide the following
additional contacts.
8.4.1
Rosemount
™
SPS 4001B and IMPS 4000: 1 to 4 probes
•
One contact closure per probe from the control room to the Rosemount SPS 4001B or
IMPS 4000 for
calibration initiate
.
•
One contact output per probe from the Rosemount SPS 4001B or IMPS 4000 to the
control room for
in calibration
notification.
•
One contact output per probe from the Rosemount SPS 4001B or IMPS 4000 to the
control foom for
calibration failed
notification. (Includes output from pressure
switch indicating
cal gas bottles empty
.)
8.4.2
Additional Rosemount
™
IMPS 4000 alarm contacts
•
One contact per Rosemount IMPS 4000 for
low calibration gas flowing
.
•
One contact per Rosemount IMPS 4000 for
high calibration gas flowing
.
Note
You can configure the 4-20 mA signal to respond normally during any calibration or to
hold the last O
2
value upon the initiation of calibration. The factory default is for the 4-20
mA signal to operate normally through calibration.
Note
Holding the last O
2
value may be useful if several probes are being averaged for the
purpose of automatic control. Unless averaging several probes, always place any control
loops using the O
2
signal into manual prior to calibrating.
Troubleshoot
Reference Manual
October 2019
00809-0100-4340
118
Emerson.com/Rosemount
Summary of Contents for Rosemount Oxymitter 4000
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