46
5
Commissioning
5.3.4
Connect Pressure-Measuring Equipment for Gas and Air
Suitable are pressure-measuring instruments with a measuring range from 0......>200 mbar.
NOTICE
The test measurement sockets should be closed again once the measurement has been com-
pleted.
5.3.5
Evaluate the Flame Stability using the Ionisation Current
General information about Ionisation Flame Monitoring
Following factors are essential regarding the safety of Ionisation Flame Monitoring:
•
The reliable monitoring of a gas flame is achieved if the flame monitoring can be optimally
adapted to the gas combustion plant.
•
The following must be taken into account. In the ionisation process, flame and burner are
also used as parts of the electrical circuit to form an optimal ionisation current. It is there-
fore essential that the boiler and burner are properly grounded.
•
Of decisive importance for the height of the ionisation current is the fuel, the burner setting
and the electrode arrangement.
•
The ionisation current increases with the calorific value of the gas. The prerequisite
for the formation of optimum values is given if, in relation to the setting of the burner:
–
a stable flame is created
–
the burner is operated with a low excess of air, so that an optimum Combustion occurs.
Flame quality and stability are evaluated by measuring the ionisation current. An ampermeter
is connected to the flame monitor for this purpose.
NOTICE
Measuring circuits must feature a secure disconnect according to EN 61140 "Protection
against electric shock " for active parts; for this reason, use only measurement and evaluation
devices which have a double or reinforced insulation.
NOTICE
Work on electrical systems or equipment may be performed only by a certified electrician or
trained personnel managed and supervised by a certified electrician according to the
electrical engineering regulations.
1 Unscrew grub screws 2...3 revolutions out of the
measuring instrument inlet connection.
2 Connect air pressure measuring device to "A" (Air).
3 Connect gas pressure measuring device to "G"
(Gas).
Summary of Contents for GFI 48
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Page 66: ...65 10 EU Declaration of Conformity 10 EU Declaration of Conformity...
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