MNA0010, Revision B October 2014
34
3.4
FL
– Diagnostic Fault display
The FAULT mode will be indicated when
the analyzer has detected a possible
problem with calibration, hardware, or
software. In addition to the yellow LED, a
relay contact (SPST- N/O) is provided.
Relay is energized in Fault mode. While in
this mode, use the INC and DEC keys to
view all the possible faults. A display of
‘FL “ indicated no fault.
Use the table below to determine the possible fault:
14 Sensor Heater Temperature Error
13 User calibration too small
12 User calibration too large
11 Non-native display range (flashing)
10 Sensor appears to be open
8 A concentration reading is not yet available
7 A/D appears to be defective
6 Analog Output Range Underflow
5 Analog Output Range Overflow
3 Device is in setup mode (via serial port)
2 Relays are in standby mode
1 Sensor Heater is warming up
FAULT LED and relay contacts will reset automatically once the error has ceased. The
FAULT condition status on the analyzer may be cleared by entering the calibration mode. If
the fault has not cleared after calibration, the FAULT LED and relay contact will be re-
enabled.
3.5
ALARM ACTIVE MODE: ALARMS 1 or 2 are in alarm state
Alarm Active mode is indicated
by a red ALM 1 LED or ALM2
LED. The analyzer has detected
an alarm condition as
determined by the alarm set up.
As you will recall, Optional Alarm
relays 1 & 2 may be configured
as ascending or descending trip,
Fail-Safe or non Fail-Safe.
Furthermore, the user may field
set the alarm point to any PPM
oxygen value within the range of
the analyzer. In addition to the
red alarm LED, Form C (SPDT)
relay contacts are provided for
each alarm.
MODE
RUN
FAULT
ALM 1
ALM 2
9.9
T
RACE
O
XYGEN
MODEL 7100 O
2
Analyzer
Mini-Zirconia
Sensor
NTRON
MODE
RUN
FAULT
ALM 1
ALM 2
9.9
T
RACE
O
XYGEN
MODEL 7100 O
2
Analyzer
Mini-Zirconia
Sensor
NTRON