Ontronic Wideband Lambda Meter

Ontronic Wideband Lambda Meter: Overview
English
Ontronic Wideband Lambda Meter
Sensor heater
The device includes a heater controller, so that the temperature of the
sensor is kept at nominal operating temperature for accurate measurement,
and to reduce thermal stress during the heatup phase. The sensor takes
about 15 seconds to reach its operating temperature.
Installation and setup
Overview
Nusa and Ontronic have joined their effort to produce an efficient, accurate
and affordable wideband lambda meter.
The lambda meter is used to measure the Air/Fuel Ratio (AFR) or Lambda
for on internal combustion engines. It can be installed on naturallyaspirated, turbocharged and Diesel engines. It is used to measure oxygen
contents and the lambda value of exhaust gases in the range 0.80 to 1.10.
The lambda ratio refers to the proportion of air and fuel present during
combustion. The chemically optimal point at which this happens is the
stoichiometric ratio (lambda=1.0). It is the ratio that modern fuel injection
systems try to reach. A mixture with lambda less than 1 is called rich, while
a mixture higher than 1 is called lean. Optimum horsepower is achieved at
around 0.90 on aspirated engines, and 0.85 on supercharged engines. The
Ontronic wideband lambda meter has been especially designed for
automotive racing, where lambda values are typically in the rich side (L<1).
The lambda value is displayed using a colorized led bar, so that reading and
interpretation is straightforward. The first led on the left side corresponds to
a lean mixture (from 1.10), while the last led on the right side corresponds to
a rich mixture (up to 0.80).
Development efforts have focused on accuracy and ergonomy. The led
display has proved to be more convenient than digital display, especially if
the meter is mounted in the engine compartment or under the dash.
The Ontronic lambda meters are robust aluminium device. Installation of the
device is easy. The kit includes the meter, a Bosch wide-band oxygen
sensor, the cables, exhaust bung and plug, manual and a fixation system.
There are two plugs to connect:
1.
2.
LSU connector: standard sensor connector (Bosch)
Power supply: +12V (brown wire) and ground (white wire) to be
connected to the engine power supply or to a cigarette-lighter adapter.
To achieve maximum precision, the device is pre-calibrated at the factory.
Due to the long term stability of the sensor, there is therefore no need to
recalibrate it.
Technical data
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Function with a variety of fuels, including leaded or unleaded gasoline,
diesel, methanol, and natural gas.
Display range from 0.80 to 1.10 lambda
Very short response time (<50 ms)
Can work as a stand-alone unit or can be coupled to the ECU
(www.ontronic-efi.com)
Accurate to +/- 1.5%
Improved display stability and readability
Small size (4.7” by 2” by 1”) and low weight (200 g)
Unobtrusive and easy to mount.
Technical aspects
The lambda meter is compatible with the Bosch LSU 4.2 wideband oxygen
sensor. This wideband sensor uses a dual sensing element that combines
the potentiometric cell (Nernst effect) in the planar design with an additional
oxygen pumping cell and diffusion gap on the same strip of ceramic.
The result is a sensor element that can precisely measure air/fuel ratios
from very rich (L<<1.0) to extremely lean (L>>1.0) mixtures.
Nusbaumer S.A, St-Maurice 7G, CH-2800 Delémont, +41 (0)32 422 05 30
www.nusa.ch
www.ontronic-efi.com