How it Works
GE Sensing
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TMO2D
Operating Manual
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Specifications
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GE Sensing TMO2D Operating Manual

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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.
• 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
10/2/00

Viewing the Event Log The Event Log may be viewed on the TMO2D display or transmitted

to a computer, printer or other data acquisition system via the RS232 serial port. T o view the Event Log on the TMO2D display , press and the following prompt appears:
[NO],
Enter Code: ***
50.0% Alarm:
MAIN MENU Setup?
MAIN MENU System Log?
SYSTEM LOG MENU Display System Log?
03: Normal Operation: 04/04/1997 10:21:58
Using the keypad, enter the system passcode (123). An asterisk is displayed as each digit is entered.
Press [NO] until the System Log? prompt appears.
Press [YES].
Press [NO] until the Display System Log? prompt appears. Then, press
[YES].
The most recent event in the Event Log is displayed.
At the above prompt, use the arrow keys to scroll through the logged events ([←] for the previous event, [→] for the next event). When done, press
[NO] to exit the Event Log. See Figure 2 below for a
description of the components of the event log screen.
Event Number (0-24)
Type of Event
03: Normal Operation:
10/02/2000 10:21:58
Date of Event
Time of Event

Figure 2: The Event Log Display Screen

913-220B 5
10/2/00

Printing the Event Log To print the Event Log, enter the [System Log] menu, as described in

the previous section. The following display appears:
SYSTEM LOG MENU Display System Log?
SYSTEM LOG MENU Print System Log?
Press [NO].
Press [YES] and the entire log is transmitted via the RS232 serial port.
The Event Log printout looks similar to the example shown in Figure 3 below.
Event Number
Event Date
00: Factory Init at: 10/02/2000 09:34:32 01: Cell Under Range at: 10/02/2000 09:34:33 02: No Calibration at: 10/05/2000 10:14:44 03: Normal Operation: 10/05/2000 10:21:58

Exiting the [System Log] Menu

Event Type
Event Time

Figure 3: A Typical Event Log Printout

To exit the [System Log] menu, proceed as follows:
SYSTEM LOG MENU Print System Log?
SYSTEM LOG MENU Done?
Press [NO] until the Done? prompt appears
Press [YES] to return to the Main Menu.
913-220B 6
10/2/00

Software Version 4C (or Later)

If the software installed in your analyzer is Version 4C or later, proceed with this section. However, if software Version 4B or earlier is installed in your analyzer, skip this section and proceed directly to the section on page 1.

Using the Fault Alarm The Fault Alarm relay is energized during normal operation. If a fault

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
• AutoCal T otal drift
• AutoCal Drift/Cal
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.
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 2 below).

Table 2: Fault Alarm Relay Conditions

Condition Alarm State Alarm Test Selection
normal operation energized ON
fault de-energized OFF
913-220B 7
10/2/00

Wiring the Fault Alarm Your TMO2D uses the relay labeled “HIGH” for the Fault Alarm.

Wire the Fault Alarm as shown in Figure 4 below.
Note: With this software version, the “LOW” alarm relay handles
both the low alarm trip point and the high alarm trip point.
HI-LOWFAULT
ALARM
ALARM
TMO2D
RECORDERS
SPAREOXYGEN
CELL
+
2
4
V
INPUTS
C
+
O
R
2
M
D
T
4
X
V
N
P
0/4-20MA
R
I
T
N
N
1
RECBRECA
I
N 2
AUTOCAL
CALPROCESS
NO NO NO NONC NC NC NCCCCC
ALARMS
HIGHLOW
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
RED BLACK WHITE BLUE
RECORDER
A
OPTIONAL
RECORDER
B
NOTES:
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 HIGH relay.
OUTLET
INLET

Figure 4: Wiring the TMO2D with Fault Alarm (Software Version 4C or Later)

ALARM
POWER
913-220B 8
10/2/00

Testing the Fault Alarm The Fault Alarm is tested in the same way as the other alarms (refer

to Table 2 on page 7 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: [HI-LOW] fault done
Select alarm to test: hi-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 9
[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
• AutoCal T otal drift
• AutoCal Drift/Cal
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 10
10/2/00

Viewing the Event Log The Event Log may be viewed on the TMO2D display or transmitted

to a computer, printer or other data acquisition system via the RS232 serial port. T o view the Event Log on the TMO2D display , press and the following prompt appears:
[NO],
Enter Code: ***
50.0% Alarm:
MAIN MENU Setup?
MAIN MENU System Log?
SYSTEM LOG MENU Display System Log?
03: Normal Operation: 04/04/1997 10:21:58
Using the keypad, enter the system passcode (123). An asterisk is displayed as each digit is entered.
Press [NO] until the System Log? prompt appears.
Press [YES].
Press [NO] until the Display System Log? prompt appears. Then, press
[YES].
The most recent event in the Event Log is displayed.
At the above prompt, use the arrow keys to scroll through the logged events ([←] for the previous event, [→] for the next event). When done, press
[NO] to exit the Event Log. See Figure 5 below for a
description of the components of the event log screen.
Event Number (0-24)
Type of Event
03: Normal Operation:
10/02/2000 10:21:58
Date of Event
Time of Event

Figure 5: The Event Log Display Screen

913-220B 11
10/2/00

Printing the Event Log To print the Event Log, enter the [System Log] menu, as described in

the previous section. The following display appears:
SYSTEM LOG MENU Display System Log?
SYSTEM LOG MENU Print System Log?
Press [NO].
Press [YES] and the entire log is transmitted via the RS232 serial port.
The Event Log printout looks similar to the example shown in Figure 6 below.
Event Number
Event Date
00: Factory Init at: 10/02/2000 09:34:32 01: Cell Under Range at: 10/02/2000 09:34:33 02: No Calibration at: 10/05/2000 10:14:44 03: Normal Operation: 10/05/2000 10:21:58

Exiting the [System Log] Menu

Event Type
Event Time

Figure 6: A Typical Event Log Printout

To exit the [System Log] menu, proceed as follows:
SYSTEM LOG MENU Print System Log?
SYSTEM LOG MENU Done?
Press [NO] until the Done? prompt appears
Press [YES] to return to the Main Menu.
913-220B 12
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