Teledyne 700 IR Series Instruction Manual page 28

700 IR Series
INFRARED GAS DETECTOR FOR COMBUSTIBLE AND CO
GASES
USER MANUAL
c) Apply the span calibration test gas at a flow rate of 0.5l/min. As the detector signal begins
to increase the display will switch to reporting a flashing "XX" reading as the detector shows
the sensor's "as found" response to the span gas presented. If it fails to meet the minimum in-
range signal change criteria within 2½ minutes, the display will report "Range Fault" twice
and the OLCT 700/710 will return to normal operation, aborting the AutoSpan sequence.
The detector will continue to report a "Range Fault" and will not clear the fault until a
successful AutoSpan is completed.
Assuming acceptable sensor signal change, after 1 minute the reading will auto-adjust to the
programmed AutoSpan level. During the next 30 seconds, the AutoSpan sequence checks
the sensor for acceptable reading stability. If the sensor fails the stability check, the reading
is re-adjusted back to the AutoSpan level and the cycle repeats until the stability check is
passed. Up to three additional 30-second stability check periods are allowed before the unit
reports a "Stability Fault" twice and the OLCT 700/710 will return to normal operation,
aborting the AutoSpan sequence. The detector will continue to report a "Stability Fault" and
will not clear the fault until a successful AutoSpan is completed.
If the sensor passes the stability check, the OLCT 700/710 reports a series of messages:
"AutoSpan Complete"
"Sensor Life XXX%"
"Remove Span Gas"
d) Remove the span gas and calibration adapter. The OLCT 700/710 will report a live reading
that alternates with "Remove Gas" message as it clears toward "0". When the reading clears
below 5 % LEL, the detector will display "Span Complete" and will revert to normal
operation. If the sensor fails to clear to less than 5 % LEL in less than 5 minutes, a "Clearing
Fault" will be reported twice and the detector will return to normal operation, aborting the
AutoSpan sequence. The OLCT 700/710 will continue to report a "Clearing Fault" and will
not clear the fault until a successful AutoSpan is completed.
NOTE 1: If the sensor fails the minimum signal change criteria, a "Range Fault" will be declared
and a "Fault Detected" message will be displayed alternately with the detector's current reading.
The 4-20 output will be taken to 0mA and the "Range Fault" fault bit will be set on the Modbus
output.
NOTE 2: If the sensor fails the stability criteria, a "Stability Fault" will be declared and a "Fault
Detected" message will be displayed alternately with the detector's current reading. The 4-20mA
output will be taken to 0mA and the "Stability Fault" fault bit will be set on the Modbus output.
NOTE 3: If the sensor fails the clearing time criteria, a "Clearing Fault" will be declared and a
"Fault Detected" message will be displayed alternately with the detector's current reading. The
4-20 output will be taken to 0mA and the "Clearing Fault" fault bit will be set on the Modbus
output.
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NP700IRIMEN
Revision E.0