Function Blocks
DEWP Function Block
134 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
Block properties
Double click on the function block to access the function block properties dialog box.
Configuration parameters
Table 41 Dewpoint function block parameters
Properties Group Parameter Index # Parameter Description Value or Selection
Furnace
Properties
Furnace
Factor
2
Allows you to adjust the %
Carbon as measured by the
controller to agree with the
results of actual shim stock
tests. This adjustment may be
needed to correct for specific
furnace characteristics such as
atmosphere differences, probe
location, and furnace leaks.
–0.5 %C to +0.5 %C
Use Anti-
Soot
Constant
3
Activates anti-sooting feature
that limits the working setpoint
of the carbon control loop to a
value that prevents sooting in
the furnace.
Click on block to select
SP HLIM is used for anti-
soot.
Low
Temperature
Limit
5
Holds controller output to 0 %
until limit is exceeded.
0 to 2500 degrees F
(1400° recommended)
Unit should match C/F
selection.
Temperature
Units
4
Probe temperature units for
display.
Click on radio button to
select.
Fahrenheit or Celsius
Percent
Hydrogen
7 Percent Hydrogen 1 to 100
default = 40
continued
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