Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 160)

IM 11M13A01-02E 10-9
10. Other Functions
10.2.2 Operation of Blowback
Figure 10.9 shows a timing chart for the operation of blowback. To execute blowback
with a contact input, use a contact input with an ON-time period of one to 11 seconds.
Once blowback starts, a contact output opens and closes at ten-second intervals during
the preset blowback time. After the blowback time elapses, the analog output remains
held at the preset status until the hold time elapses (refer to Section 8.1, 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
blockback operations.
Analog output remains held
(with HOLD feature specified)
ON-time period of 1 to 11 seconds for the contact input
Blowback start
(with contact input or
touchpanel operation)
Blowback time
Contact output
(blowback 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 Blowback
10.2.3 Setting Output Hold Time and Blowback Time
If the blowback mode is in “No function,” the output “Hold time” and “Blowback 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 “Blowback time,” the numeric-data entry display appears. Enter the
desired “Blowback time” from 00 minutes, 00 seconds to 60 minutes, 59 seconds.
10.2.4 Setting Interval, Start Date, and Start Time
The interval is the time to execute blowback. 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 blowback is first executed
and the time when to start the blowback, respectively. If you want to execute the first
blowback, 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 tine: 0 0 : 0 0
Enter
Blow back setup
F10.10E.EPS
Figure 10.10 Blowback Setup Display