Signet FSDD
The higher-resolution benchtop analyzer in the Signet range - 72-element coverage for high-purity gold verification.
Semsons Tech
XRF Gold Analyzers & Gold Testing Machines
XRF gold testing tells you what a piece is actually made of without destroying it. For a manufacturer that means incoming verification, in-process control across melts, and outgoing assurance before goods leave the floor. For a retailer or buyer it means settling a purity question in under a minute at the counter.
Semsons Tech supplies the Signet range of XRF analyzers plus a portable gold testing machine. The two flagship benchtop units are the Signet FSDD and the Signet Si-Pin, which differ mainly in detector, resolution and element coverage.
Models
Machines in this range
Signet Si-Pin
Trace detection down to ppm in a lighter 25 kg benchtop unit - the Signet for smaller floors and wider element questions.
Signet-PC
A further unit in the Signet XRF family, listed in the catalogue alongside the FSDD and Si-Pin.
Portable Gold Tester
Gold verification away from the bench - with one power requirement you need to know before you buy.
Specifications
Compare the range
| Parameter | Signet FSDD | Signet Si-Pin |
|---|---|---|
| Detector | Silicon PIN | SIPIN (USA) |
| Resolution | 145 ± 15 eV | 165 ± 5 eV |
| Analysis range | 1%–99.99% Au | ppm to 99.99% |
| Accuracy | ±0.03% Au | ±0.03% (Au ≥ 99.9%) |
| Sample form | Solid, powder, liquid | Solid, powder, liquid |
| Elements | Up to 72 kinds of elements | No. 11 to No. 92, excluding light elements |
| Test time | 10–60 s; ~40 s for best results | Approx. 5–60 s |
| High voltage | 9–50 kV | 0–50 kV / 0–1 mA |
| Sample chamber | 360 × 298 × 86 mm | 300 × 300 × 100 mm |
| Instrument size | 618 × 418 × 315 mm | L400 × W350 × H300 mm |
| Net weight | Approx. 40 kg | Approx. 25 kg |
Answers
Common questions
Written to be useful before you buy, not after.
How accurate is XRF gold testing?
Both the Signet FSDD and Signet Si-Pin are catalogue-specified at ±0.03% — the Si-Pin figure is stated for gold at 99.9% and above. The FSDD analyses from 1% to 99.99% Au; the Si-Pin from ppm to 99.99%. For best results the FSDD entry specifies roughly a 40-second test, within a 10 to 60 second range.
Does XRF testing damage the piece?
No. XRF is non-destructive — the sample sits in the chamber and is analysed without cutting, scraping or dissolving it. That is why it suits finished jewellery, incoming scrap and customer walk-ins equally.
Which Signet model should I choose?
If your work is primarily high-purity gold verification, the FSDD's 145 ± 15 eV resolution and 72-element coverage is the stronger instrument. If you need to detect trace elements down to ppm, or you want a lighter 25 kg unit with a smaller footprint, the Si-Pin is the better fit. Tell us your sample types and volumes and we will recommend one.
Can XRF test powder and liquid as well as solid gold?
Yes — both benchtop Signet models are catalogue-specified for solid, powder and liquid measurement objects.
What environment does the machine need?
The FSDD is specified for 0–35 °C ambient temperature and humidity below 70%, on a 230V/50Hz input. Keep it out of direct heat and away from polishing dust.
Get in touch
Enquire about Gold Testing & XRF Analyzers
Tell us what you are producing and we will recommend the right model — including when the honest answer is that you do not need this machine yet.
Enquire about Gold Testing & XRF Analyzers
Share your production requirement and we will come back within one working day with the right model, a realistic throughput estimate and a quotation.