Eclipse RatioMatic v3.00 - Design Guide No. 110, 4/98
All standard RatioMatics are designed for:
•
air:gas ratio controlled combustion.
•
10% to 15% excess air at high fire.
•
higher excess air at low fire
Burner Control
RatioMatics come with a ratio regulator that maintains the air:gas
ratio.
Air Butterfly
Valve (BV)
Loading Line
Control Motor
Ratio
Regulator
Gas
Flo
w
Heat
•
A control signal is sent from a process temperature controller
(sold separately) to the control motor. (Refer to Bulletin
818C or contact Eclipse Combustion for further information
on temperature controllers.)
Control
Signal
Gas Flow
Process
Set Point
Process
Controller
Control
Motor
Air
BV
Ratio
Regulator
Temperature
Pressure
Impulse
•
The control motor modulates the air butterfly valve (BV)
which controls the combustion air flow.
•
Air pressure in the burner body sends an impulse down the
loading line to the ratio regulator.
•
The ratio regulator controls the gas flow in proportion to the
air flow.
Warning:
Do not use other control methods, such as, a fixed-air
control, and do not alter the ratio regulator or burner
piping without prior approval from Eclipse Combustion.
3-5
Step 3:
Control
Methodology
Air/Gas Flow
Gas
Air
Stoichiometric
Ra
tio
co
nt
ro
l o
pe
ra
tio
n
Excess
air
