Att: Henrik GM
Her er lige lidt på LSM-11. Men det er mest en allround beskrivelse ikke en detaljeret hvorfor LSM-11 er anderledes! Sorry men det er det bedste jeg pt kan finde. Det sidste er lidt volapyk men det er beskrivelse til er par diagrammer som ikke kunne sættet ind.
Mvh Henrik D.S.
www.wolf3d.dk
Technical data
Application conditions
Temperature range, passive (storage-temperature range) –40…+100 °C
Sustained exhaust-gas temperature with heating switched on +150…+600 °C
Permissible max. exhaust-gas temperature with heating switched on
(200 h cumulative) +800 °C
Operating temperature
of the sensor-housing hexagon ² +500 °C
At the cable gland ² +200 °C
At the connection cable ² +150 °C
At the connector ² +120 °C
Temperature gradient at the sensor-ceramic front end ² +100 K/s
Temperature gradient at the sensor-housing hexagon ² +150 K/s
Permissible oscillations at the hexagon
Stochastic oscillations – acceleration, max. ² 800 m · s–2
Sinusoidal oscillations – amplitude ² 0.3 mm
Sinusoidal oscillations – acceleration ² 300 m · s–2
Load current, max. ±1 μA
Heater element
Nominal supply voltage (preferably AC) 12 Veff
Operating voltage 12…13 V
Nominal heating power for JGas = 350 °C and exhaust-gas flow speed
of Å 0.7 m · s–1 at 12 V heater voltage in steady state Å 16 W
Heater current at 12 V steady state Å 1.25 A
Insulation resistance between heater and sensor connection > 30 M½
Data for heater applications
Lambda control range ì 1.00…2.00
Sensor output voltage for ì = 1.025…2.00 at JGas = 220 °C
and a flow rate of 0.4…0.9 m · s–1 68…3.5 mV 2)
Sensor internal resistance Ri~ in air at 20 °C and at 12 V heater voltage ² 250 ½
Sensor voltage in air at 20 °C in as-new state and at 13 V heater voltage –9...–15 mV 3)
Manufacturing tolerance Æ ì in as-new state (standard deviation 1 s)
at JGas = 220 °C and a flow rate of approx. 0.7 m · s–1
at ì = 1.30 ² ±0.013
at ì = 1.80 ² ±0.050
Relative sensitivity Æ US/Æ ì at ì = 1.30 0.65 mV/0.01
Influence of the exhaust-gas temperature on sensor signal for a temperature increase
from 130 °C to 230 °C, at a flow rate ² 0.7 m · s–1
at ì = 1.30; Æ ì ² ±0.01
Influence of heater-voltage change ±10 % of 12 V at JGas = 220 °C
at ì = 1.30; Æ ì ² ±0.009
at ì = 1.80; Æ ì ² ±0.035
Response time at JGas = 220 °C and approx. 0.7 m · s–1 flow rate
As-new values for the 66% switching point; ì jump = 1.10 Ö 1.30
for jump in the “lean” direction 2.0 s
for jump in the “rich” direction 1.5 s
Guideline value for sensor’s “readines for control” point to be reached
after switching on oil burner and sensor heater;
JGas Å 220 °C; flow rate approx. 1.8 m · s–1;
ì = 1.45; sensor in exhaust pipe dia. 170 mm 70 s
Sensor ageing Æ ì in heating-oil exhaust gas after 1,000 h continuous burner operation
with EL heating oil; measured at JGas = 220 °C
at ì = 1.30 ² ±0.012
at ì = 1.80 ² ±0.052
Useful life for JGa < 300 °C In individual cases to be checked by
customer; guideline value > 10,000 h
2) See characteristic curves. 3) Upon request –8.5...–12 mV.
Warranty claims
In accordance with the general Terms of
Delivery A17, warranty claims can only be
accepted under the conditions that permissible
fuels were used. That is, residue-free,
gaseous hydrocarbons and light heating oil
in accordance with DIN 51 603.
ì
U
Design and function
The ceramic part of the Lambda sensor
(solid electrolyte) is in the form of a tube
closed at one end. The inside and outside
surfaces of the sensor ceramic have a
microporous platinum layer (electrode)
which, on the one hand, has a decisive influence
on the sensor characteristic, and
on the other, is used for contacting purposes.
The platinum layer on that part of the
sensor ceramic which is in contact with the
exhaust gas is covered with a firmly bonded,
highly porous protective ceramic layer
which prevents the residues in the exhaust
gas from eroding the catalytic platinum
layer. The sensor thus features good longterm
stability.
The sensor protrudes into the flow of exhaust
gas and is designed such that the exhaust
gas flows around one electrode,
whilst the other electrode is in contact with
the outside air (atmosphere). Measurements
are taken of the residual oxygen content
in the exhaust gas.
The catalytic effect of the electrode surface
at the sensor’s exhaust-gas end produces
a step-type sensor-voltage profile in the
area around ì = 1. 1)
The active sensor ceramic (ZrO2) is heated
from inside by means of a ceramic Wolfram
heater so that the temperature of the sensor
ceramic remains above the 350 °C
function limit irrespective of the exhaustgas
temperature. The ceramic heater
features a PTC characteristic, which results
in rapid warm-up and restricts the
power requirements when the exhaust gas
is hot. The heater-element connections are
completely decoupled from the sensor
signal voltage (R ³ 30 M½). Additional
design measures serve to stabilize the lean
characteristic-curve profile of the Type
LSM11 Lambda sensor at ì > 1.0...1.5 (for
special applications up to ì = 2.0):
– Use of powerful heater (16 W)
– Special design of the protective tube
– Modified electrode/protective-layer
system.
1) The excess-air factor (ì) is the ratio between
the actual and the ideal air/fuel ratio.
The special design permits:
– Reliable control even with low exhaustgas
temperatues (e.g. with engine at idle),
– Flexible installation unaffected by external
heating,
– Function parameters practically independent
of exhaust-gas temperature,
– Low exhaust-gas values due to the
sensor’s rapid dynamic response,
– Little danger of contamination and thus
long service life,
– Waterproof sensor housing.
Explanation of symbols
US Sensor voltage
UH Heater voltage
JA Exhaust-gas temperature
ì Excess-air factor 1)
O2 Oxygen concentration in %
X
A
-
+
E
C
D
g
sw
ws
SW 22
21,8
ø12
M18x1,5 6e
ø22,6
73
10,5
28,2
66 L-200
L
B
-
X
+
Dimension drawing.
A Signal voltage, B Heater voltage, C Cable sleeve and seals,
D Protective tube, E Protective sleeve, L Overall length. ws White,
sw Black, g Grey.
Air
4
3 ����
����
��
1 2
5 6
Us
Exhaust gas
Lambda sensor in exhaust pipe (principle).
1 Sensor ceramic, 2 Electrodes, 3 Contact,
4 Housing contact, 5 Exhaust pipe, 6 Ceramic
protective coating (porous).
1.0 1.2 1.4 1.6 l
30
20
10
0
mV
1.8 2.0
UH = 12 V
A = 220°C
3.31 5.71 7.54 8.98 10.14%O
US Sensor voltage
2
J
Characteristic curve: Propane gas
(lean range).
0.8 1.0 1.2 1.4 1.6
Excess-air factorl
US
mV
1.8 2.0
UH = 12 V
A = 220°C
1
2
Sensor voltage
J
200
400
600
800 a
b
Characteristic curve: Complete range.
1 Closed-loop control ì = 1; 2 Lean control
a Rich A/F mixture, b Lean A/F mixture
Log ind
Tilmeld
OSS
Søg
.
. Nok mest anvendeligt i indkøringsfasen.
. Ikke alt for genialt efter min mening. Det er det ikke fordi det så bliver svære lige at sige at det sku var ved 0,5 bars tryk der var noget der skulle ændres... Hvor mange % var det nu lige det var så.