Siemens QRB Series User manual
Landis & Staefa Division CC1N7714E June 14, 1999 1/4
7714
Photoresistive Detectors QRB...
QRB1...A with large flange QRB1...A with small flange QRB1...B QRB3...
and clamp and clamp with plug with flange and clamp
Photoresistive flame detectors for use with Landis & Staefa burner controls,
for the supervision of oil flames in the visible light spectrum.
The flame detectors are used primarily in connection with burner controls for
small burners.
The QRB... and this data sheet are intended for use by OEMs which integrate
the flame detectors in their products.
The QRB... are designed for the supervision of yellow-burning oil flames.
Photoresistive detector For use with burner controls type
QRB... LAL..., LOA...
For QRC... blue-flame detectors, refer to data sheet 7716.
Compact photoresistive detector with infused two-wire thermoplastic cable.
The flame detector is available with normal or high sensitivity and with or without
flange / clamp or soft plastic plug (refer to «Type summary»).
Flame detector without soft plastic plug.
This type of detector is fitted with the help of a securing flange.
A guide groove in the securing flange and a cam on the detector clamp ensure
vibration-free mounting and make certain that the detector is always correctly sited
towards the flame.
•Securing flange with 22 mm spacing for use with
the QRB1...1
•Securing flange with 36 mm spacing for use with
the QRB1...2
•Clamp
Flame detector with soft plastic plug.
For mounting this type of detector on the burner, all that is required is a hole with a
lateral groove (refer to «Dimensions»).
The sealing and securing ribs of the soft plastic plug hold the detector firmly in the
hole.
The guide guarantees correct alignment of the photoresistive element with the flame.
The detector is supplied with a protective tube of 17 mm diameter.
This type of detector is always secured with a flange and a clamp (refer to
«Accessories»).
ISO 9001
Use
Mechanical design
QRB1...A
Accessories
QRB1...B
QRB3...
2/4 CC1N7714E June 14, 1999 Landis & Staefa Division
To avoid injury to persons, damage to property or the environment, the
following warning notes should be observed!
It is not permitted to open, interfere with or modify the flame detector!
• Before performing any wiring changes in the connection area of the QRB..., the
burner control must be completely isolated from the mains supply!
• Ensure protection against electric shock hazard on the detector itself and on all
electrical connections through appropriate mounting!
• Check the wiring and all safety functions!
• Installation and commissioning work may only be carried out by qualified staff!
• Observe the permissible length of the detector cable!
→Refer to «Technical data»
• Always run the detector cable separate from other cables, especially from the
ignition cable, while observing the greatest possible distances!
• The relevant national safety regulations must be complied with!
• The detector should not be subjected to mechanical shocks!
The intensity of the radiation of light on site is checked by measuring the detector
current.
Legend
A Incidence of light
M DC microammeter (internal
resistance
max. 5000
Ω
)
For the minimum detector current values required, refer to the data sheet of the
respective burner control.
Do not use any burner cleansing sprays.
When cleaning the photoresistive detector, always use a clean cloth.
Warning notes
Installation notes
Commissioning notes
Measurement circuit
QRB... M-+12 11 LOA...
22 23 LAL2/3...
23 22 LAL1...
7714d01/0599
A
+
-
Service notes
Landis & Staefa Division CC1N7714E June 14, 1999 3/4
I* (cm) 18 / 20 28 / 30 28 / 30 33 / 35 48 / 50 48 / 50 58 / 60 68 / 70 78 / 80 148 /
150
m(mm) 40 25 40 40 40 70 25 70 70 70
* With plug / without plug
Type
reference Flange Clamp Feature Sensitivity
QRB3 Without Without Protection pocket Normal
QRB3(1) With With Protection pocket Normal
QRB3S Without Without Protection pocket High
QRB3S(1) With With Protection pocket High
Item For use with Part number ¹)
Flange with 21 mm spacing QRB1... 4 241 1462 0
Flange with 36 mm spacing QRB1... 4 241 1600 0
Clamp QRB1... 4 186 1096 0
Flange QRB3... 4 286 1490 0
Clamp QRB3... 4 186 8806 0
¹) When ordering individual items:
Items are supplied together with the flame detector, depending on the type of detector
(refer to «Type summary»).
When ordering, please give type reference according to «Type summary».
The QRB1... with plug is always supplied without flange / clamp, and vice versa.
QRB1...: normal sensitivity
standard casing length 50 mm
visible cable length 200 mm
stripped length 40 mm
with terminating sleeves
without plug
without flange / clamp QRB1A-A020B40A
QRB1...: as above
but with a small flange / clamp QRB1A-A020B40A1
Type summary
QRB1... QR B 1 A- A 0 3 5 B 4 0 B _
Accessory
1: small flange/ clamp
2: largeflange/ clamp
Plug
A: without plug
B: withplug
Strippedlength"
m
" inmm
End of cable
A: unstripped
B: withterminatingsleeves
Visibl e cable length "
I
" in cm
Type of casing
A: standard casing length "
g
" =50 cm
B: standard casing length "
g
" =65 cm
Sensitivity
A: normal (colour ofcasing: black)
B: high (colour of casing: red)
Available dimensions
QRB3...
Accessories
Ordering
Example
4/4 CC1N7714E June 14, 1999 Landis & Staefa Division
Environmental conditions Degree of protection IP 40
Transport IEC 721-3-2 Mounting orientation optional
Climatic conditions class 2K2
Temperature range -20...+60 °C Cable length for detectors used
Humidity < 95 % r.h. in connection with LOA... / LAL... max. 1.5 m
Mechanical conditions class 2M2
Operation IEC 721-3-3 Detector cable 2 x 0.75 mm²; 5.1 mm dia.
Climatic conditions class 3K5
Temperature range -20...+60 °C Weight
Humidity < 95 % r.h. - QRB1... (depending on type) 20...35 g
Condensation, formation of ice and - QRB3... (without cable) approx. 35 g
ingress of water are not permitted!
With this type of flame supervision, the radiation of oil flames in the visible light
spectrum is used for generating the flame signal.
The light-sensitive element is a photoresistor.
When there is no light, the detector's resistance is in the MΩrange.
Its resistance drops as the intensity of illumination increases (kΩrange).
In contrast to the selenium photocell of the RAR... detectors, glowing firebrick in the
combustion chamber can be detected.
Dimensions in mm
Technical data
Function
Dimensions
3,6
28
21
4 241 1462 0
m
l
8,8
g8
4 186 1096 0
26
4,6
45
36
16
4 241 1600 0
13,5
8,8
9
g
lm
4,6
26
45
36
9
4 286 1490 0
79
4 186 8806 0
10 QRB3...
20
7
A
A
7714m04/0499
14,2
15,6
2
17
QRB1...A
QRB1...B
QRB3...
A
1999 Landis & Staefa Produktion Deutschland
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