Lambda Sensor LSU 4.9

This sensor is designed to measure the proportion of oxygen in exhaust gases of automotive engines (gasoline or Diesel).

The wide band lambda sensor LSU 4.9 is a planar ZrO2 dual cell limiting current sensor with integrated heater. Its monotonic output signal in the range of lambda 0.65 to air makes the LSU 4.9 capable of being used as a universal sensor for lambda 1 measurement as well as for other lambda ranges. The connector module contains a trimming resistor, which defines the characteristic of the sensor.

The main benefit of the LSU 4.9 is the robust design combined with the high Bosch production quality standard.

This lambda sensor operates only in combination with a special LSU-IC, used in most Bosch Motorsport ECUs and lambda control units like LT4. You’ll find this unit and more on our homepage at Electronics/Sensor Interfaces.

Features

  • Application: lambda 0.65 to ∞
  • Exhaust gas temperature: 930°C (1,030 for a short time)
  • Hexagon temperature: 600°C
  • Thread: M18x1.5
  • Weight: 120 g

Application

Application

lambda 0.65 to ∞

Fuel compatibility

gasoline/Diesel/E85

Exhaust gas pressure

≤ 2.5 bar (higher with decrease accuracy)

Exhaust gas temperature range (operating)

< 930°C

Exhaust gas temperature range (max.) for short time

< 1,030°C

Hexagon temperature

< 600°C

Wire and protective sleeve temperature

< 250°C

Connector temperature

< 140°C

Storage temperature range

-40 to 100°C

Max. vibration (stochastic peak level)

300 m/s2

Technical Specifications

Variations

LSU 4.9 with automotive connector

Connector

1 928 404 687

Mating connector

D 261 205 356-01

Wire length L

95.0 cm

LSU 4.9 with motorsport connector

Connector

AS607-35PN

Mating connector

AS007-35SN

Wire length L

20.0 to 90.0 cm

Mechanical Data

Weight w/o wire

120 g

Thread

M18x1.5

Wrench size

22 mm

Tightening torque

40 to 60 Nm

Electrical Data

Power supply H+ nominal

7.5 V

System supply voltage

10.8 V to 16.5 V

Heater power steady state

7.5 W

Heater control frequency

≥ 100 Hz

Nominal resistance of Nernst cell

300 Ohm

Max current load for Nernst cell

250 µA

Characteristic

Signal output

IP meas

Accuracy at lambda 0.8

0.80 ± 0.01

Accuracy at lambda 1

1.016 ± 0.007

Accuracy at lambda 1.7

1.70 ± 0.05

IP [mA]

lambda

UA [V], v=17

UA [V], v=8

-2.000

0.650

-

0.510

-1.602

0.700

-

0.707

-1.243

0.750

0.192

0.884

-0.927

0.800

0.525

1.041

-0.800

0.822

0.658

1.104

-0.652

0.850

0.814

1.177

-0.405

0.900

1.074

1.299

-0.183

0.950

1.307

1.409

-0.106

0.970

1.388

1.448

-0.040

0.990

1.458

1.480

0

1.003

1.500

1.500

0.015

1.010

1.515

1.507

0.097

1.050

1.602

1.548

0.193

1.100

1.703

1.596

0.250

1.132

1.763

1.624

0.329

1.179

1.846

1.663

0.671

1.429

2.206

1.832

0.938

1.701

2.487

1.964

1.150

1.990

2.710

2.069

1.385

2.434

2.958

2.186

1.700

3.413

3.289

2.342

2.000

5.391

3.605

2.490

2.150

7.506

3.762

2.565

2.250

10.119

3.868

2.614

Please note: UA is not an output signal of the lambda sensor, but the output of the evaluation circuit. Only IP correlates with the oxygen content of the exhaust gas. Amplification factor v=17 is typically used for lean applications (lambda>1), amplification factor v=8 is typically used for rich applications (lambda<1).

Heater Strategy

Connectors and Wires

Connector

Please see variations

Mating connector

Please see variations

Sleeve

fiber glass / silicone coated

Pin 1

Pump current APE / IP

Pin 2

Virtual ground IPN / VM

Pin 3

Heater voltage H- / Uh-

Pin 4

Heater voltage H+ / Uh+

Pin 5

Trim resistor RT / IA

Pin 6

Nernst voltage UN / RE

Wire length

Please see variations

Various motorsport and automotive connectors are available on request.

Installation Notes

This lambda sensor operates only in combination with a special LSU-IC, used in most Bosch Motorsport ECUs and lambda control units like LT4. You’ll find this unit and more on our homepage at Accessories/Expansion Modules.

The lambda sensor should be installed at point which permits the measurement of a representative exhaust-gas mixture, which does not exceed the maximum permissible temperature.

Install at a point where the gas is as hot as possible.

Observe the maximum permissible temperature.

As far as possible install the sensor vertically (wire upwards).

The sensor is not to be fitted near to the exhaust pipe outlet, so that the influence of the outside air can be ruled out.

The exhaust-gas passage opposite the sensor must be free of leaks in order to avoid the effects of leak-air.

Protect the sensor against condensation water.

The sensor is not to be painted, nor is wax to be applied or any other forms of treatment. Use only the recommended grease for lubricating the thread.

Please find further application hints in the offer drawing at our homepage.

Safety Note

The sensor is not intended to be used for safety related applications without appropriate measures for signal validation in the application system.

Ordering Information

 

Lambda Sensor LSU 4.9

With automotive connector

Order number: 0 258 017 025

Lambda Sensor LSU 4.9

With motorsport connector

Order number: B 261 209 358-03

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