Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - Manual (Page 185)

IM 11M12D01-01E 10-23
10. Other Functions
10.5.4 Operation of Blowback
Figure 10.26 shows blowback timing. To execute blowback by a contact input, use it
with an on-time period of 1 to 11 seconds. Once blowback starts, the SV-CH contact
output repeatedly opens and closes at an interval of approximately 10 seconds during the
preset blowback time. During the blowback time and hold time on a channel, its indi-
vidual analog output remains held at a value preset in the Output Hold Setup and
excluded from averaging group calculations. After the hold time has elapsed, blowback
is started on the next channel.
Ch1 output hold
Ch2 output hold
Ch1 blowback time
Ch2 blowback time
10 s 10 s
F10.26E.eps
Average output
Blowback start in
Blowback time
Ch1 output hold
Ch1 removed from Average
On
Off
Solenoid valve switching
Blowback start
Off
On
Hold time
Blowback time
Ch2 output hold
Ch2 removed from Average
Hold time
SV-Ch1 contact
SV-Ch2 contact
Fig. 10.26 Blowback Timing
Blowback parameters are set as shown in Table 10.6 prior factory shipment or after data
initialization.
Table 10.6 Blowback Default Setting
T10.6E.eps
Item Init. Setting
Mode No function(disabled)
Hold time 3 minutes 00 second
Blowback time 3 minutes 00 second
Interval 30 day 00 hour
Start date 01/ 01/ 01
Start time 00: 00