About free valuations

About free valuations

* How to use our valuations

Our free valuations are for cars up to eight years old and are revised every month by a team of researchers with years of experience, so you know they can be relied on. When you get a valuation you will see five sets of figures:
* Part exchange price

This is the value of a car when trading it in for a newer vehicle at a franchised or reputable independent dealer.
* Dealer price

This is the selling price asked by established independent dealers. This price will include VAT and a profit margin for the dealer.
* Trade price

What private buyers will get by selling their car direct to a trader or dealership in a cash deal wtih no part-exchange.
* Private price

What private buyers should expect to pay for a car seen in the classified advertisements of a newspaper or magazine, or shown in a used car publication.
* Cost new

The most recent manufacturer's on-the-road price for a brand new car.

GM CEO Whitacre paid for own charter flight

Wednesday was a busy day for General Motors CEO Ed Whitacre by anyone's definition. He started the day with a trip to The General's Fairfax plant in Kansas to tell the world that GM was paying off the remaining $5.8 billion in government loans five years ahead of schedule and to announce a $257 million investment for a pair of plants. After the announcement came a trip to Washington to meet with House Speaker Nancy Pelosi and the Michigan delegation from Congress.

There was no way for Whitacre to rock a Chevy Malibu from Kansas to Washington in a couple hours, so Big Ed instead chartered a flight to our nation's capitol. You may remember what happened the last time an automaker CEO flew into Washington. It wasn't pretty. So instead of using a private jet on company funds, The Detroit News reports that Whitacre busted out the check book and paid for the flight to Washington on his own dime. Given the fact that Big Ed received a $158 million retirement package from AT&T (and part-time use of a private plane), we're guessing the trip isn't going to break the bank.

We're a long way away from knowing whether Whitacre is as good an automotive CEO as he was a telecommunications chief executive, but the early returns show that the burly Texan at least pays attention to history.

Test Drive the Car

Test Drive the Car
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After all the checks are complete, your final test for a used car before you decide to purchase it is a test drive of the car. Here are some of the factors that you should consider while taking a test drive:

*
Check the efficiency of the ignition system. The car should start at the first attempt without any problems.
*
Pay attention to the synchronization and smoothness of the steering wheel, brake pedals, clutch, and the gear shifts.
*
Check if there is any kind of unwanted noises or vibrations coming from the car engine or other parts while driving the car at different speeds.
*
Verify whether you get the promised mileage or not.
*
Also check for efficiency of acceleration and deceleration.

Linear, Rotary & Angular Position Sensors

Our range of non-contact position sensors use patented induction technology to accurately sense the position of a metallic 'activator' mounted to the application. There is NO contact between the sensor and the moving activator, so the position sensor performance will not deteriorate through use.

Sealed to IP67, these non-contact position sensors are ideal for applications where grime, moisture, temperature and vibration can have an adverse affect on other types of sensor.

Magnetostrictive Linear Position Sensors

Magnetostriction is a property of ferromagnetic materials
such as iron, nickel, and cobalt position sensor . When placed in a magnetic
field, these materials change size and/or shape (see Figure 1).

Figure 1
A magnetising force, H,
causes a dimensional
change due to the
alignment of magnetic domains.

The physical response of a ferromagnetic material is due to
the presence of magnetic moments, and can be understood
by considering the material as a collection of tiny permanent
magnets, or domains. position sensor Each domain consists of many atoms.

When a material is not magnetized, the domains are randomly
arranged. When the material is magnetized, the domains are
oriented with their axes approximately parallel to one another.

Interaction of an external magnetic field with the domains
causes the magnetostrictive effect.

This effect can be optimized by controlling the ordering of
the domains through alloy selection, position sensor thermal annealing, cold
working, and magnetic field strength.

The ferromagnetic materials used in magnetostrictive position
sensors are transition metals such as iron, nickel, and cobalt.
In these metals, the 3d electron shell is not completely filled,
which allows the formation of a magnetic moment. (i.e., the
shells closer to the nucleus than the 3d shell are complete,
and they do not contribute to the magnetic moment). As
electron spins are rotated by a magnetic field, coupling
between the electron spin and electron orbit causes electron
energies to change position sensor. The crystal then strains so that electrons
at the surface can relax to states of lower energy. When a
material has positive magnetostriction, it enlarges when
placed in a magnetic field; with negative magnetostriction,
the material shrinks. The amount of magnetostriction in base elements and simple alloys is small, on the order of 10-6 m/m.

Since applying a magnetic field causes stress that changes
the physical properties of a magnetostrictive material, it is
interesting to note that the reverse is also true: applying
stress to a magnetostrictive material changes its magnetic
properties (e.g., magnetic permeability). This is called the
Villari effect.

Normal magnetostriction and the Villari effect are both used
in producing a magnetostrictive position sensor.

Figure 2
The Wiedemann effect describes
the twisting due to an axial
magnetic field applied to a
ferromagnetic wire or tube
that is carrying an electric
current.

An important characteristic of a wire made of a
magnetostrictive material is the Wiedemann effect (see
Figure 2). When an axial magnetic field is applied to a
magnetostrictive wire, and a current is passed through
the wire, a twisting occurs at the location of the axial
magnetic field. The twisting is caused by interaction of
the axial magnetic field, usually from a permanent
magnet, with the magnetic field along the magnetostrictive
wire, which is present due to the current in the wire.
The current is applied as a short-duration pulse position sensor, -1 or
2 µs; the minimum current density is along the center
of the wire and the maximum at the wire surface. This
is due to the skin effect.

The magnetic field intensity is also greatest at the wire
surface. This aids in developing the waveguide twist.
Since the current is applied as a pulse, the mechanical
twisting travels in the wire as an ultrasonic wave. The
magnetostrictive wire is therefore called the waveguide.
The wave travels at the speed of sound in the waveguide
material position sensor, ~ 3O00 m/s.

The operation of a magnetostrictive position sensor is shown
in Figure 3.

Figure 3.
The interaction of a current pulse with the position magnet
generates a strain pulse that travels down the waveguide
and is detected by the pickup element.

The axial magnetic field is provided by a position magnet.
The position magnet is attached to the machine tool,
hydraulic cylinder, or whatever is being measured. The
waveguide wire is enclosed within a protective cover and
is attached to the stationary part of the machine, hydraulic
cylinder, etc.

The location of the position magnet is determined by first
applying a current pulse to the waveguide. At the same
time, a timer is started. The current pulse causes a sonic
wave to be generated at the location of the position
magnet Wiedemann effect position sensor. The sonic wave travels along
the waveguide until it is detected by the pickup.

This stops the timer. The elapsed time indicated by the
timer then represents the distance between the position
magnet and the pickup.

The sonic wave also travels in the direction away from
the pickup. In order to avoid an interfering signal from
waves travelling in this direction, their energy is absorbed
by a damping device (called the damp).

The pickup makes use of the Villari effect. A small piece of
magnetostrictive material, called the tape, is welded to
the waveguide near one end of the waveguide. This tape
passes through a coil and is magnetized by a small permanent
magnet called the bias magnet. When a sonic wave
propagates down the waveguide and then down the tape,
the stress induced by the wave causes a wave of changed
permeability (Villari effect) in the tape. This in turn causes
a change in the tape magnetic flux density, and thus a
voltage output pulse is produced from the coil (Faraday
effect). The voltage pulse is detected by the electronic
circuitry and conditioned into the desired output.

MTS magnetostrictive sensors are available with many
outputs, position sensor including DC voltage, current, pulse width
modulation, start-stop digital pulses, CANbus, Profibus,
serial synchronous interface, HART, and others.

Position Sensor Leader

Position Sensor Leader

Position sensor - Novotechnik develops and manufactures a wide variety of rotary and linear position transducers, position sensors, potentiometers, components and other related products for motion control. All of our products are produced to the same standards of the highest quality and true reliability.

One unvarying thing stands out about Novotechnik -- we stand behind every position sensor, transducer, and our other products. We do this through superior engineering, proven reliability, and by consistently publishing clear, no nonsense specifications for all of our sensors and other products.

Whether you need to know repeatability of a position sensor , temperature coefficient or product life expectation, it’s readily available with no guess work. When you have this kind of information available about the products you choose, it makes each aspect of a product solidly defined. Reliability becomes true reliability.

Novotechnik has a long-standing tradition of working with customers to develop custom sensors for their applications. Contact us to discuss your needs.

Put our enhanced site to use in solving your position sensor and motion control needs.

Innovative Development begins with Spectra Symbol

The potentiometers are made of a variety of materials ranging from polyester to fiberglass, depending on the temperature or cycle need position sensor

. Additionally,position sensor our potentiometers are the thinnest linear position sensors on the market, at only 0.5mm, and are unparalleled in the industry.

Multiple patents and extensive proprietary technology over position sensor 30 years has put Spectra Symbol in the driver’s seat for membrane potentiometer technology in the linear position sensor marketplace position sensor. A few short years ago, no membrane potentiometer sensor was available that could handle 60°C temperature or 100% humidity.

Now, with the advent of the HotPot potentiometer, the playing field has changed such that industrial, aerospace and automotive companies are now able to take advantage of the ultra-thin 0.5mm linear potentiometer produced by Spectra Symbol position sensor. And the development continues, including the upcoming MagnetoPot technology soon to be released.

Spectra Symbol also offers custom products where you design your product and we will build it. You can always get our standard products with some special, position sensor value-added, features, such as embedded switches together with the potentiometer circuit for a fraction of the price of typical switching.