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Overview
Flame monitor
Selenium Photocell Detector RAR …
Application
RAR… is used for the monitoring of yel-
low burning oil flames.
WARNINGS:
When observing the following
warnings, unsafe conditions
hazardous to life, property
and environment can be
avoided!
It is not permitted to open the unit or
to make changes or modifications!
- Never do any work in the power sup-
ply area without first disconnecting all
external power supplies.
- Provide for appropriate protection
against direct contact on the power
supplies.
- Before commissioning, check the
wiring and all safety functions.
- After being subjected to any impact
load, take these detectors out of ope-
ration as safety functions may be
affected even if there is no external
damage visible.
Assembling
- Observe the applicable local safety
regulations.
- Mount the detector to the burner by
means of snap-on fastening (can be
locked into place in light metal flange
attached to burner).
Installation
- Allow only qualified personnel to per-
form the installation.
Electrical connection of detectors
Ensure a trouble-free and loss-free
signal transmission if possible:
- Never run the detector cable together
with other cables.
- Cable capacitance reduces the
size of the flame signal.
- Use a separate cable.
- Take care to observe the permissible
length of detector cables, see “Type
Overview”
- Always run the ignition cables with a
large distance to the unit and to other
cables if possible.
Commissioning
- Allow only qualified personnel to per-
form commissioning and maintenance
work.
- The intensity of the light radiation on
the location of the detector is checked
by measuring the detector current.
Circuit for detector current measure-
ment
A
Incidence of light
M
Micro-ammeter direct current,
internal resistance 5000
Ω
Refer to the data sheet of the respective
automatic furnace controller for mini-
mum required detector current values.
Disposal
The detector contains electrical and
electronic components and must not be
disposed of as household waste. It is
essential to observe the local and appli-
cable legal conditions and regulations.
Design
- Dust-proof TS plastics enclosure
- Photocell under protective glass
- Shipment optional with/without flange
and shackle, see “Type Overview”
Type Overview
Type Length of Detector Cable
Flange and Shackle
RAR7
up to max. 20m without
RAR7(1)
up to max. 20m with
RAR8
up to max. 100m without
RAR8(1)
up to max. 100m with
When ordering please state the type
designation according to type overview.
Technical Data
Class I
System of protection IP40
Any mounting position
Weight approx. 85g
Environment
Transport:
IEC 721-3-2
Climatic conditions: class 2K2
Mechanical conditions: class 2M2
Temperature range: -20 to +60°C
Humidity: <95% relative humidity
Operation:
IEC 721-3-3
Climatic conditions: class 3K5
Mechanical conditions: class 3M2
Temperature range: -20 to +60°C
Humidity: <95% relative humidity
Dewing, icing and ingress of water
are not permitted!
Function
In this monitoring mode, the radiation of
oil flames in the visible range of the light
spectrum is used for the formation of
the flame signal. The light-sensitive ele-
ment is a selenium cell. When lit, it deli-
vers a direct voltage and thus causes
the current to flow to the input of the
flame signal amplifier. The RAR… is
thus an active detector. The cell is non-
sensitive in the infrared area so that the
slightly glowing firebricks of the furnace
are not detected.
Dimensioned drawings
Dimensions in mm
