How a TPMS Sensor Is Made, and Where Your Logo Goes

· 6 min read

The sequence, in the order it actually happens

A sensor is a small object, but there are five steps where it can be made wrong, and each step has

to be checked before the next one hides the error.

Step	What happens	What goes wrong if it is skipped
1	SMT — the radio and sensing PCB is populated	A cold joint passes a bench test and fails in a hot cab
2	Laser engraving — your logo and part number on the body	Engraved after potting means rework of a finished unit
3	Assembly and potting — board into the housing, sealed	Air trapped at the seal shows up as an IP failure months later
4	Calibration — pressure and temperature points written to the unit	A unit reads consistently wrong, and nobody believes the numbers
5	Sealing test — immersion / pressure decay	The IP67 or IP68 claim becomes an assumption instead of a result

The laser step sits at number two deliberately. Engraving a finished, potted sensor means either

rejecting it or accepting a cosmetic defect — so the marking goes on while the body is still

accessible.

The reason a custom logo sounds expensive to most factories is that they outsource the marking and

treat it as a tooling fixture. We engrave in-house, so the workflow is:

1. You send the logo file and the part number you want on the body.

2. We engrave one sample and send you a photograph.

3. On approval, the batch goes into production with your branding, packaging and documentation.

One complete set is enough to start. Branding does not change the specification of the sensor —

it is the same platform, same calibration, same sealing test.

Frequency and power on the bench (see our RF test article) — every unit.
Calibration points — pressure at several points against a reference, temperature at two.
Sealing — immersion test, and a pressure-decay check on the sealed body.
Battery voltage — recorded, because a low cell at assembly is a warranty claim in a year.

We do not claim a factory certification we do not hold: CE is in progress, not held as of

November 2026. We also do not claim that every unit is individually traceable to a serial number

unless the order specifies it — if your project needs unit-level traceability, say so at the RFQ

stage, because that changes the labelling step.

Can the logo be on the packaging too? Yes. Packaging artwork and language are yours; we print

and pack to your files.

Does branding delay the order? It adds the sample-approval step. It is a marking operation, not

a new product.

Can I get the sensor without any branding? Yes — neutral marking, or ours.

What if the engraving is not right on the sample? We adjust the artwork and engrave again; that

is what the sample step is for.

What this shows: our own engraving step and the production line the sensors come off - marking happens before assembly, not after.