Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - Manual (Page 129)

IM 11M12D01-01E 8-3
8. Detailed Data Setting
8.1.2 Output Hold Setting (Applies to All Outputs)
During warmup, during calibration, and when an error occurs, output hold status applies:
the analog output is held at a preset value. In this instrument, the permissible hold values
which may be set are shown in Table 8.1 . The hold setting applies to the outputs of all
channels.
[Warmup], [Calibration / Indication check / Blowback], or [Error] statuses may occur
independently for each channel; only the outputs of any channels in these statuses are in
[HOLD] status. However the [Error] status, [Control Card Abnormal], causes *all* the
individual channel outputs and *all* the averaging outputs to be in [HOLD] status. Both
(Under) Maintenance and Process Gas Alarm statuses also apply to the whole system
and cause *all* the individual channel outputs and *all* the averaging outputs to be in
[HOLD] status.
"No Valid Channels in Averaging Group" status applies to individual averaging groups;
it means that either no channels are assigned to an averaging group, or that the status of
all channels in the averaging group is set to "disabled"; and the output of groups in this
status will be in HOLD status.
CAUTION
[Disable] means setting channel card power "OFF" so that card may be swapped. Refer
to "Sec. 11.2 Hot Swap Functions".
Table 8.1
4mA 20mA
Valid output hold values
Status
Preset value
(2.4mA-21.6mA) Hold last
value Don’t
hold
Warmup, Purging
(Under) Maintenance
(Under) Calibration
Indication Check
Blowback
Process Gas Alarm
Error
No Valid Channels in
Averaging Group
T8.1E.eps
< Definition of Statuses >
1) Warmup period
Warmup period lasts from power on until cell temperature stabilizes at 750
؇ C and the
instrument switches to measurement mode. The basic panel display shows cell tempera-
ture during warmup period.
"Purging" is the passing of calibration gas through the calibration gas piping before
warmup, to remove any condensate in the piping. Refer to Sec. 10.6 Purging. Warmup
does not start until after purging ends.