GE Moisture Image 1 Series, Programming Manual

Page: 73 / 125

Advanced Programming 3-9
April 2004
Entering Constants
and User Functions
The Series 1 allows you to enter two types of constants, a user
constant and a saturation constant, as well as user-defined functions
and tables to manipulate data.
Note: Refer to the section Background Gas Current Multipliers for
the Delta F Oxygen Cell in Chapter 2 of the Service Manual to
enter a current multiplier for oxygen.
A user constant is a fixed value for moisture, temperature, or
pressure entered into the meter instead of using a “live” input. For
example, if the process runs at a steady pressure, you can enter the
constant pressure into the memory rather than using a pressure
transmitter. For special applications, you can also multiply the
moisture ppm value by a constant value (K
×
ppm
v
).
A reverse video “K”symbols appears in the top-right-hand corner of
the box (in matrix format) for channels that are using a user constant
value. A symbol does not appear in the graph format.
The other type of constant is a saturation constant. The Series 1
requires a saturation constant in order to calculate ppm
w
in non-
aqueous liquids. If you do not know the saturation constant of the
liquid, contact GE Panametrics.
To extend programming capability, user functions allow operators to
program up to four desired mathematical equations on each channel.
Users can assign any recorder output or alarm relays to user functions
on any channel. In addition, they can use any parameter on any
channel to calculate a different parameter.
Enter user constants, saturation constants, and user-defined functions
and tables through the User Constant Menu. Use Table 3-4 below to
enter this menu. Figure 3-18 on page 3-31 for a menu map.
Use the appropriate section that follows to make entries.
Table 3-4: Entering the User Constant Menu
Press the Main Menu key: To enter the:
OPTIONS Option Menu
USER User Constant Menu