BarScreenSensor
Ingot testing with the ultrasonic analyser from Goldanalytix.
The BarScreenSensor is the most important measuring device for testing the authenticity of gold bars (and other precious metal bars). The ultrasonic measurement allows full penetration of all common ingot sizes above one ounce and detects inclusions of foreign metals with differing sound velocities. When buying ingots, the BarScreenSensor will save a lot of trouble and prevent major losses in value. Checking their own stock gives users security and credibility with potential customers. Thus, precious metal dealers, banks and collectors can benefit from the BarScreenSensor both when buying and selling.
Ultrasonic measurement - the proven method for precious metal objects from 100 grams
The measuring principle of the BarScreenSensor is based on the ultrasonic measurement, in which the speed of sound is measured and thus the material of which the object is made is checked.
All metals in their pure form have a specific speed of sound. During the measurement, the BarScreenSensor emits an ultrasonic signal and measures the time the sound takes to return to the measuring head. If either the thickness or the speed of sound is known, the device can calculate the other property. A built-in core of, for example, tungsten (for gold) or a lead-tin alloy (for silver) would deflect the ultrasonic signal and thus significantly shorten the time between transmission and reception. Thus, the thickness or the speed of sound would not correspond to the desired value and the forgery is exposed.
Frequently asked questions about the BarScreenSensor
If you cannot find your question here, please use the contact form or send us an enquiry directly to gold-analytix@marawe.eu.
This depends entirely on which objects you want to check:
For classic investors (coins and bars), the GoldScreenSensor (also measures through packaging) in combination with a caliper and precision scale is usually sufficient . For bars from 50 to 100 grams upwards, we also recommend the BarScreenSensor, for which the objects must be unpacked. The GoldScreenPen can also be used for smaller investment objects up to approx. 1 ounce.
For gold jewellery, measurement with a combination of CaratScreenPen and DensityScreenScale is ideal. The fineness of gold (carat number) can also be determined with our test acid sets.
As a tungsten detector, the MagneticScreenScale is an alternative to the GoldScreenSensor for gold objects from approx. 1/4 ounce to 250 g. This MagneticScreenScale is a good choice for those who want to focus entirely on gold and do not want to unpack 100 gram bars, for example.
When measuring with the BarScreenSensor, it is important to remove the packaging of the object and apply the ultrasound gel to the measuring head. The measuring head must be in direct contact with the test piece.
It is also necessary to scan the entire ingot. It is possible that foreign metal inclusions can only be found at certain points within the object. In addition, the ingot should be physically measured beforehand so that the measured ultrasonic value can be compared with the real thickness.
Furthermore, it is important to pay attention to the size/thickness of the object. If it is too thin, the BarScreenSensor could give wrong results. Therefore, please use the BarScreenSensor only for bars of 50 to 100 grams or more. In addition, you should use at least one other measuring method (e.g. digital caliper and precision scale).
The smaller the bar to be tested, the more embossing and stamps in the gold/silver have an effect on the measurement result.
No, we recommend the BarScreenSensor only from a weight of 50 to 100 grams and coins do not normally reach this value. If the test objects are too thin, the path length of the ultrasound is not long enough to perform a sufficiently precise measurement.
The GoldScreenSensor which can test smaller objects like coins and bars up to approx. 2 ounces, is an excellent addition to the BarScreenSensor.
No. For ultrasound measurement with the BarScreenSensor, the measuring head combined with an ultrasound gel (included in the delivery) must be in direct contact with the smooth surface of the object.
To measure through thin packaging and blisters, devices such as the GoldScreenSensor are more suitable.