Teledyne 9060 Operating Instructions Manual page 66

9060-Zirconia Analyser
62. Duration Of Autocal Gas 1
Set the number of seconds that the autocal gas solenoid will be open. At the end of this
period, if the oxygen level measured is not within the limits set for Cal Gas 2, an 'Gas 2
Cal Error' will initiate. To determine the minimum time required for a particular length or
design of probe to settle, manually admit cal gas while observing the oxygen reading in
'RUN' mode. Typical minimum times vary from 15 seconds to 90 seconds, depending on
the probe length and gas
plumbing arrangement. If there is a filter fitted to the oxygen probe, the calibration check
reading will be much closer
to the actual gas value.
Range:
0 to 90 seconds. The default setting is 10 seconds.
63. Freeze Time Gas 1
After the Cal Gas 1 period, the transmitter output will remain fixed (frozen) for an
adjustable period to allow the probe reading to return to the correct process level and
avoid output 'bumps'. The freeze period time required will depend on the probe response
time, and whether or not it has a filter fitted.
Range:
0 to 100 seconds in one second steps. The default setting is 30 seconds. To determine
the required freeze time, manually perform a calibration check with Gas 1 while the plant is
in operation and note the time required for the reading to return to the correct process level
within approximately 0.5 % oxygen.
If the freeze time is set to zero the 4-20mA outputs will be updated during the purge time
AND the freeze time. (ie. the outputs will NOT be frozen) This mode will satisfy
Environmental Protection Authorities if required.
64 to 69. Cal Gas 2 Parameters
Enter the same requirements for Cal Gas 2 as per set-up steps 58 to 63 for Cal Gas 1.
Cal Gas 2 could typically be 2 % oxygen in nitrogen.
70. Process Alarm Enable
If process alarms are not required, 'NO' can be selected. There will not be any process
related alarms generated, and all process alarms will be cancelled, if 'NO' is selected.
The process alarms are High oxygen, Low oxygen, Oxygen deviation, and Very low
oxygen.
Options:
Yes
No *
71. High Oxygen Alarm
Set the operating point for the high oxygen alarm relay.
Range:
0.1 –30.0% oxygen. The default setting is 10.0 % oxygen.
72. High Oxygen Delay