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6 | Configuration and function

D-LX 201/721

6.2 Device description

Features of the compact flame monitor:

● Consistent dual-channel microcontroller system (channel 1 and channel 2) for the

control and monitoring of safety-relevant flame monitoring functions, with continual

self monitoring

● Range selection switching, which enables the flame monitor to be changed to a dif-

ferent parameter set (intensity and frequency switching threshold, gain character-

istic curve, Flame Failure Detection Time [FFDT]),

● 8 gain characteristic curves available for selection for each range

● Dynamically controlled fault relays with monitoring of the internal operating

voltages and all safety-relevant hardware functions (see Fig.6.3 in Kapitel 6.1

Functional description [}41])

● Flame relays with self-monitoring circuit

● Step-wise adjustment of switching thresholds for intensity (16 steps) and flicker fre-

quency (4 steps)

● LED display for depicting operational readiness of the active range, flame notifica-

tion or flame monitor fault; indicates the flame intensity by flashing with variable

frequency

● Optionally available flame stability signal as indicator for changes to the combus-

tion situation, especially flame stability. With the flame stability signal you can de-

tect changes in the combustion early and if necessary take countermeasures in or-

der to prevent flame rupture or optimise the firing.

● Optimised filtering for better separation of the background radiation from the in-

tensity of the flame that is to be monitored

● Analogue output 0/4 ... 20 mA for the external display of various measured vari-

ables such as the flame intensity [}115], the flicker frequency or the flame stability

signal. The analogue output is configured with the D-LX 201 InformationCentre.

Selective single-burner monitoring or combustion chamber monitoring can be

achieved by selecting the suitable flame monitor type, correctly positioning/aligning the

sighting tubes and adjusting the device parameters.

All of the customer's connecting terminals are already pre-wired in the device, and are

lead out on the connecting cable (wiring by the customer).

The switching thresholds for the compact flame monitor's flame notification can be ad-

justed using the rotary controls und DIP switches.

The Flame Failure Detection Time [}115] (FFDT) is set to 1 second for each range at

the factory. Longer FFDTs (2 secs, 3 secs or 5 secs) can be set up on customer re-

quest.

DURAG D-LX 721 User Manual

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