Emerson OXYMITTER 4000 - Manual (Page 107)

Instruction Manual
IB-106-340 Rev. 3.0
December 2003
Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 8-3
Oxymitter 4000
8-4 ALARM CONTACTS
a. If autocalibration is not utilized, a common bi-
directional logic contact is provided for any of
the diagnostic alarms listed in Table 8-1. The
assignment of alarms that actuate this contact
can be modified to one of seven additional
groupings (mode 1 through mode 7) listed in
Table 7-1.
The logic contact is self-powered, +5 VDC,
340 ohm series resistance. An interposing
relay will be required if this contact is to be
utilized to annunciate a higher voltage de-
vice, such as a light or horn, and may also
be required for certain DCS input cards. A
Potter & Brumfield R10S-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.
b. If autocalibration systems are utilized, the
bidirectional logic contact is utilized as a
“handshake” signal between the autocalibra-
tion system (SPS 4000 or IMPS 4000) and is
unavailable for alarming purposes. The fol-
lowing additional contacts are provided
through the autocalibration systems:
1. SPS 4000 and IMPS 4000, 1-4 probes.
(a) One contact closure per probe
from the control room to the SPS
4000 or IMPS 4000 for “calibration
initiate”.
(b) One contact output per probe from
the SPS 4000 or IMPS 4000 to the
(c) control room for “in calibration”
notification.
(d) Once contact output per probe
from the SPS 4000 or IMPS 4000
to the control room for “calibration
failed” notification. (Includes output
from pressure switch indicating “cal
gas bottles empty”).
2. Additional IMPS 4000 Alarm Contacts.
(a) One contact per IMPS 4000 for
“low calibration gas flowing”.
(b) One contact per IMPS 4000 for
“high calibration gas flowing”.
NOTE
The 4-20 mA signal can be configured
to respond normally during any cali-
bration, or can be configured to hold
the last O
2
value upon the initiation of
calibration. Factory default is for the
4-20 mA signal to operate normally
throughout calibration.
NOTE
Holding the last O
2
value may be use-
ful if several probes are being aver-
aged for the purpose of automatic
control. Unless several probes are
being averaged, always place any con-
trol loops using the O
2
signal into
manual prior to calibrating.
8-5 IDENTIFYING AND CORRECTING ALARM
INDICATIONS WITH MEMBRANE KEYPAD
Faults in the Oxymitter 4000 are indicated using
the four diagnostic, or unit, alarms, Figure 8-2.
The pattern of repeating blinks will define the
problem. A condensed table of the errors and
the corresponding blink codes can be found on
the inside right cover of the electronics housing.
Table 8-1 identifies the blink code and fault
status of each LED as well as the output of the
4-20 mA signal line and a fault number that cor-
responds to the troubleshooting instructions
provided in this section.
For an Oxymitter 4000 with the optional LOI,
alarm messages are displayed on the LOI dis-
play window when the alarm status display is
accessed via the LOI menu. A listing of the
alarm/fault messages and the related fault
status descriptions and fault numbers are
shown in Table 8-2.