Unigas R75A, Installation, Use & Maintenance Manual, Page: 13 / 48

PART I: SPECIFICATIONS
13
1.13 Measuring the gas pressure in the combustion head
In order to measure the pressure in the combustion head, insert the pressure gauge probes: one into the combustion chamber’s
pressure outlet to get the pressure in the combustion chamber and the other one into the butterfly valve’s pressure outlet of the burner.
On the basis of the measured differential pressure, it is possible to get the maximum flow rate: in the pressure - rate curves (showed on
the next paragraph), it is easy to find out the burner’s output in Stm
3
/h (quoted on the x axis) from the pressure measured in the
combustion head (quoted on the y axis). The data obtained must be considered when adjusting the gas flow rate.
1.14 Pressure - rate in combustion head curves
ATTENTION: THE BURNED GAS RATE MUST BE READ AT THE GAS FLOW METER. WHEN IT IS NOT POSSIBLE,
THE USER CAN REFERS TO THE PRESSURE-RATE CURVES AS GENERAL INFORMATION ONLY.
Curves are referred to pressure = 0mbar in the combustion chamber!
Ga
s pre
ssu
re
in
combustion
h
ead
(mbar)
RX75
Stm
3
/h
RX75R
Stm
3
/h
Gas pressure
in
combu
stio
n head
(mba
r)
R75A M-..
Stm
3
/h