GE XMO2, User Manual

Page: 127 / 196

September 2007
7-12 Advanced Programming
GAS VALUE EXP FILTER
Option
The Gas Value Exp Filter? option is used to specify the five
parameters associated with the XMO2’s fast response algorithm for
the main gas when background gas compensation is disabled. To use
this option, refer to the menu map in Figure C-8 on page C-8 and
proceed as follows:
IMPORTANT:
The fast response parameters are set up at the
factory, and should not need to be changed. If you
are having problems with the fast response option,
consult the factory before making any changes.
Note:
This menu option appears only if Response Type is Fast and
Background Compensation is OFF .
The Gas Value Exp Filter? submenu includes the following options:
•
Set Tau(up)
•
Set Tau(down)
•
Set Exp Threshold
•
Set Window Threshold
•
Set Smooth Threshold
•
Done
Proceed to the appropriate section for programming instructions.
The Set Tau(up) option:
The Tau(up) parameter is the diffusion constant of oxygen into the
background gas. Its default value is 22.0, but values of 15.0-35.0 are
acceptable (oscillation increases as the value increases). To set this
parameter, proceed as follows:
CALIBRATE SYSTEM
Press [N] until this prompt
appears, then press
[Y]
or
[Enter]
.
Gas Value Exp Filter?
Gas Value Exp Filter:
Press
[N]
until this prompt
appears, then press
[Y]
or
[Enter]
.
Set Tau(up)?
Tau(up) Value:
To accept the current value, press
[Y]
or
[Enter]
. To change the
current value, use the numeric
keys to enter a new value and
press
[Y] or [Enter] twice.
Tau [xx.x]