Forney PM-IDD IIIA Amplifier User Manual
err iiss a
errss.. It has a wide range of
tuning capabilities and output contacts that make it especially popular in
the multi burner application. The IDD amplifier is available as a rack
mount (RM-IDD) or panel mount (PM-IDD IIIA) and compatible with a
variety of Forney flame detectors, making it suitable for coal, oil or
natural gas applications.
The primary objective of any flame detector system is to detect
the presence or absence of a target flame inside an enclosed
furnace or combustion chamber. The challenge for most
detectors is the ability to discriminate one burner flame from
another. The Forney IDD flame detector amplifier has a superior
capability to do just that.
The output of the Forney IDD detector, when viewing a
flame, is an analogue signal with a multitude of frequencies. The
IDD amplifier receives this signal and has the capability of
selecting one of many discrete frequencies which best
represents the "flame on" condition. This unique tuning feature
allows the IDD to provide repeatable "flame on" and "flame off"
status, independent of the fuel burned, burner firing rate, boiler
load or number of burners in service. To further refine the
tuning a "sensitivity" or gain adjustment potentiometer is
available as well as multiple filter quality factor ("Q") settings*.
Finally, as with all Forney flame detector amplifiers, two
separate sensitivity settings (A or B) allow for switching from
one to another, if boiler operating conditions require it.
* “Q” is a relative gain factor at the selected discrete frequency of the
amplifier, programmable within the amplifier.
• FL AME DISCRIMINATION– is
achieved by selecting the peak
flame frequency. Many dis-
crete choices are available
along with multiple filter “Q”
• UPGRADE CAPABILITY–
Amplifier is compatible with all
versions of IDD-II and IDD-UV
• PANEL OR RACK MOUNT –
The self contained panel mount
is suitable for smaller quan-
tities of detectors while the
rack mount is best for large
• SIMPLIFIED TROUBLE
SHOOTING – LED status
displays indicate amplifier
• ANALOG INTENSITY –
separate flame intensity
outputs of 0-10 vdc, 4-20 mA
for each detector input.
• BUILT IN SAFETY –
Electronic checking is initiated
every 2 minutes to ensure that
detector circuits respond to an
actual loss-of-flame condition.
PM-IDD IIIA Amplifier