Lambda Sensor Mini-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 Mini-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 capable of being used as a universal sensor for lambda = 1 measurement as well as for lean and rich ranges.

The connector housing contains a trimming resistor, which defines the characteristic of the sensor. The main benefit of the Mini-LSU 4.9 is its very compact design in combination with the high Bosch production quality standard. The Mini-LSU is produced and tested in a handmade process.

The complete light weight housing is made of Inconel which makes it resistant against high temperatures. The sensor element is more than 50 % smaller than it is in the production lambda sensor. It is connected over silver coated steel cables to make it more reliable against vibrations.

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: 700°C
  • Thread: M16x1.5
  • Weight: 28 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

≤ 700°C

Wire and protective sleeve temperature

< 250°C

Connector temperature

< 150°C

Storage temperature range

-40 to 100°C

Max. vibration (stochastic peak level)

300 m/s2 (see Installation Notes)

Technical Specifications

Variations

Mini-LSU 4.9 with automotive connector

Connector

1 928 404 682

Mating connector

D 261 205 356-01

Wire length L

950 mm

Mini-LSU 4.9 with motorsport connector

Connector

AS 6-07-35PN

Mating connector

AS 0-07-35SN

Wire length L

200 to 1,400 mm

Mechanical Data

Weight w/o wire

28 g

Thread

M16x1.5

Wrench size

17 mm

Tightening torque

60 Nm

Electrical Data

Power supply H+ nominal

7.5 V

System supply voltage H+ (min)

10.8 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

I P [mA]

lambda

U A [V], v=17

U A [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

Resistance/LSU Temperature

R (Ohm)

Temp (°C)

80

1030

150

888

200

840

250

806

300 [operating point]

780

350

761

400

744

450

729

550

703

650

686

800

665

1000

642

1200

628

2500

567

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 and 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.

Sensors should be installed as close to vertical as possible (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 system up stand and surrounding the sensor must be sealed in order to avoid the effects of leakage 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.

A higher maximum vibration profile is possible and should be determined by the customer’s individual application.

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 Mini-LSU 4.9

With automotive connector

Order number: B 258 490 103-30

Lambda Sensor Mini-LSU 4.9

With motorsport connector

Order number: F 02U V02 227-02

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