Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 147)

<10. Other Functions>
10-9
IM 11M12A01-02E
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 repeatedly opens and closes at an interval of
approximately 10 seconds 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 sample 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.ai
Figure 10.9 Operation of Blow back
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.
10.2.1.4 Setting Interval, Start Date, and Start Time
The “Interval” is the time to execute blow back. Display the numeric-data entry panel display to
set the desired interval from 000 days, 00 hours to 255 days, 59 hours.
For the “Start date” and “Start time”, set the date when the blow back is first executed and the
time when to start the blow back, respectively. If you want to execute the first blow back, for
example, at 4:00 p.m. on March 25, 2001, enter 25/ 03/ 01 for the Start date and 16:00 for the
Start time.
Mode: Auto

Hold time: 1 0 min 0 0 s
 Blow back time:
1 0 min 0 0 s

Interval: 3 0 d 0 0 h
 Start date: 0 1 / 0 1 / 0 0
 Start time: 0 0 : 0 0
Enter
Blow back setup
F10.10E.ai
Figure 10.10 Blow back Setup Display
In the Blow back setup display shown in Figure 10.10, if you choose “Mode: No function” or
“Semi_Auto”, the Interval, Start date, and Start time for these are not displayed.
8th Edition : Jan.13,2012-00