Figure 2-13 Carb Function Block Examples - Honeywell UMC800 Reference Manual

2.15 CARB Function Block,
Example
Figure 2-13 shows Function Block Diagrams using an CARB function block
Supports Zirconia Probes from:
Super Systems Inc., Marithon Monitors
Furnace Control Corp., Advanced Atmosphere
Uses a single block for %C calculation and PID control Supports
CO Compensation from an Analyzer input or a fixed value (use
20% as default for Methane)
Calculates Dewpoint applied to separate output
Provides a Furnace Factor Bias adjustment (to
adjust %C to match lab samples)
Provides Anti-sooting setpoint limiting
Probe burn-off using standard logic functions
Carbon Potential Probe Burn-off
Application:
To clean a carbon probe periodically
by blowing air across it for a specific
time.
In this configuration, a periodic timer
generates a pulse a designated time
interval which suspends automatic
control and energizes a relay output
to cause air flow for a probe burn off
cycle. Timers determine the probe
burn-off period and allow time for
the probe recovery before returning
the loop to automatic control.
Configuration Notes:
Select probe Mfg.. type
O2 probe input: 0 to 2 V.
PTMR Output
(0 to 2000 range)
MDSW Output
Select T/C type J or K etc..
Time Delay to AUTO
3/99
continued
Timing Diagram
Auto
Manual
Off delay #1
Burnoff Time

Figure 2-13 CARB Function Block Examples

Function Block Reference Guide
DegC or F
%CO, 0-100%
Auto
Off delay #2
Function Blocks
0-2000 mV Range
59