GE Sensing TMO2D Operating Manual
10/2/00
TMO2D with Fault Alarm and Event Log
Your TMO2D oxygen analyzer has been modified to provide a Fault
Alarm relay contact and an Event Log. However, before you can
access these features, the TMO2D must be installed and programmed
as instructed in your basic User’s Manual.
Depending on the specific software version installed in your unit, the
details for using the Fault Alarm and Event Log differ somewhat.
After verifying your software version, proceed directly to one of the
following sections:
• Software Version 4B or earlier - go to the section below
• Software Version 4C or later - go to the section on page 7
Software Version 4B (or Earlier)
Using the Fault Alarm The Fault Alarm relay is energized during normal operation. If a fault
If the software installed in your analyzer is Version 4B or earlier,
proceed with this section. However, if software Version 4C or later is
installed in your analyzer, skip this section and proceed directly to the
section on page 7.
or a power failure occurs, the relay is de-energized. This is known as
failsafe operation. The relay has Form-C contacts, so that a fault can
be indicated with either an open contact or a closed contact.
The failsafe Fault Alarm trips when one or more of the following
fault events occurs:
• power failure
• RAM checksum failure (memory corruption)
• transmitter under range
• transmitter over range
• no calibration curve
The TMO2D indicates a fault event by de-energizing the relay. If
multiple faults occur simultaneously, the TMO2D indicates the fault
from highest precedence (power failure) to lowest (no calibration
curve), in the order listed above. When all fault conditions have been
removed, the fault relay is re-energized.
Faults are detected only when the TMO2D is in Operate Mode
(displaying data). When in Menu Mode (during programming), the
detection and signaling of faults is suspended. In this case, the Fault
Alarm holds its last state (energized or de-energized) until the unit has
been returned to Operate Mode.
913-220B 1
10/2/00
Using the Fault Alarm
(cont.)
To provide power-failure detection, the Fault Alarm relay is
energized (ON) during normal operation and de-energized (OFF)
during a fault condition. Therefore, when testing the alarm relay,
select “ON” to indicate a normal operating condition and “OFF” to
indicate a fault condition (see Table 1 below).
Table 1: Fault Alarm Relay Conditions
Condition Alarm State Alarm Test Selection
normal operation energized ON
fault de-energized OFF
Wiring the Fault Alarm Your TMO2D uses the relay labeled “CAL” for the Fault Alarm.
Wire the Fault Alarm as shown in Figure 1 below.
LOWHIGH
ALARM
ALARM
TMO2D
T-CABLE
237-047
OR EQUAL
E
K
T
E
C
I
D
U
A
H
L
E
L
W
B
B
R
4321
TRANSMITTER
OUTLET
INLET
RED
BLACK
WHITE
BLUE
+
2
4
V
SPAREOXYGEN
CELL
INPUTS
C
+
O
R
2
M
D
T
4
X
V
N
P
RECORDER
A
OPTIONAL
RECORDER
B
R
T
N
RECORDERS
I
I
N
N
2
1
0/4-20MA
RECBRECA
NOTES:
AUTOCAL
CALPROCESS
NO NO NO NONC NC NC NCCCCC
ALARMS
HIGHLOW
ALARM
POWER
FAULT
ALARM
1. Standard relays are rated for 2 Amps, 120 VAC.
2. User must ensure ag a i nst explosive gas mixtures
when using auto-calibration.
3. Fault alarm is wired normally-closed to common
at the CAL relay.
Figure 1: Wiring the TMO2D with Fault Alarm (Software Version 4B or Earlier)
913-220B 2
10/2/00
Testing the Fault Alarm The Fault Alarm is tested in the same way as the other alarms (refer
to Table 1 on page 2 for a summary of the Fault Alarm relay
conditions). Follow the instructions in Chapter 4 of your User’s
Manual under Alarms Test to enter the
that the display below now shows
[Alarms Test] menu. Notice
[fault] as an additional choice.
Select alarm to test:
[HIGH] low fault done
Select alarm to test:
high low [FAULT] done
Turn Fault Alarm:
[ON] off done
Note: When
[YES] is pressed above, the alarm relay turns ON (non-
fault condition), and the selection brackets move to
Turn Fault Alarm:
on [OFF] done
Note: When
[YES] is pressed above, the alarm r elay turns OFF (fault
condition), and the selection brackets move to
Use the [NO] or arrow keys to
select
[FAULT].
Press [YES] to confirm your
selection.
Use the [NO] or arrow keys to
select
[ON]. Then press [YES]
to turn the Fault Alarm ON
(non-fault condition).
[OFF].
Press [YES] to turn the Fault
Alarm OFF (fault condition).
[ON].
Turn Fault Alarm:
on off [DONE]
When you finish testing the
Fault Alarm, use the
arrow keys to select
Then, press
[YES] to exit the
[NO] or
[DONE].
Fault Alarm test menu.
Exit the
913-220B 3
[Alarms Test] menu as described in your User’s Manual.
10/2/00
Using the Event Log Your modified TMO2D maintains an Event Log in battery-backed
memory . Among other things, this log indicates the nature of any fault
signaled by the Fault Alarm relay by recording the type, date, and
time of the relevant events.
The Event Log can record up to 25 events of the following types:
• factory initialization
• system power on
• system RESET
• RAM checksum failure (memory corruption)
• transmitter under range
• transmitter over range
• no calibration curve
• return to normal operation
Note: Testing the Fault Alarm does not appear in the Event L o g .
The TMO2D stores only the 25 most recent events in its memory.
When additional events occur, the TMO2D discards the oldest event
from the log to make room for the new event.
913-220B 4
Loading...