Blow Back; Mode; Operation Of Blow Back - YOKOGAWA ZR22G User Manual

10.5

Blow Back

This section explains the parameter settings for performing blow back.
10.5.1

Mode

There are three modes of blow back operation: no function, semi-automatic, and automatic.
Blow back is not performed when the mode is set to "No function". In "Semi_Auto" mode, blow
back can be started by key operation on the display or by a contact input signal, and then
sequentially performed at a preset blow back time and hold time. In "Auto" mode, blow back
is automatically performed at preset intervals. For "Semi_Auto" or "Auto" modes, blow back is
performed. The following restrictions apply:
When "None" is selected:
l
Blow back is not performed
When "Semi-automatic" is selected:
l
Semi-auto blow back can be performed. (Blow back does not start at Auto blow back start time.)
When "Automatic, semi-automatic" is selected:
l
Blow back can be performed in either "Auto" or "Semi_Auto" mode.
(1) "Converter menu" > "maintenance" > Blowbak setting"
(2) Select "mode" then you can select "None", "Semi-automatic", "Automatic, semi-automatic".
Figure 10.18
10.5.2

Operation of Blow back

The timing chart of blowback operation is shown next. To perform blowback on contact input signal, input
a contact signal for at least 1 second and not more than 11 seconds. When blowback is initiated, contact
output repeats opening and closing approximately every 10 seconds during setup blowback time. After the
blowback period has elapsed, the analogue output is held in a state configured at the "setup of the output
hold" until the Hold time has elapsed (see Section "8.2
a time period from when the blow back ends until the sample gases are replaced in the detector and the
output returns to the steady state.
Blow back start
(with contact input or
touchpanel operation)
Contact output
(blow back switch)
Analog output
Figure 10.9
Blowback setting
ON-time period of 1 to 11 seconds for the contact input
Blow back time
ON
(for 10
seconds)
OFF
(for 10 seconds)
Operation of Blow back
<10. Other Functions>
Output Hold Setting"). For the Hold time, set
ON
ON
(for 10
(for 10
seconds)
seconds)
Analog output remains held
(with HOLD feature specified)
10-12
Hold time
F10.9E.ai
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00