Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 158)

IM 11M12A01-03E 10-10
10.2.1.2 Operation of Blow back
Figure 10.9 shows a timing chart for the operation of blow back. To execute blow back
with a contact input, use a contact input with an ON-time period of one to 11 seconds.
Once blow back starts, a contact output opens and closes at ten-second intervals during
the preset blow back time. After the blow back time elapses, the analog output remains
held at the preset status until the hold time elapses (refer to Section 8.2, earlier in this
manual).
As the hold (output stabilization) time, set the time until the measured gas is returned to
the sensor and output returns to the normal operating conditions, after completing blow
back operations.
Analog output remains held
(with HOLD feature specified)
ON-time period of 1 to 11 seconds for the contact input
Blow back start
(with contact input or
touchpanel operation)
Blow back time
Contact output
(blow back switch)
ON
(for 10
seconds) ON
(for 10
seconds)
OFF
(for 10 seconds)
Analog output
Hold time
ON
(for 10
seconds)
F10.9E.EPS
Figure 10.9 Operation of Blockback
10.2.1.3 Setting Output Hold Time and Blow back Time
If the blow back mode is in “No function,” the output “Hold time” and “Blow back
time” are not displayed. If you select “Hold time,” the numeric-data entry display
appears. Enter the desired “Hold time” (output-stabilization time) from 00 minutes, 00
seconds to 60 minutes, 59 seconds.
When you select “Blow back time,” the numeric-data entry display appears. Enter the
desired “Blow back time” from 00 minutes, 00 seconds to 60 minutes, 59 seconds.