Brand · TPMS Technology

GRUNDIG TPMS Technology Explained: How Our Sensors Deliver Reliable Real-Time Pressure Data

Grundig Motion · 2026 · Product Engineering

Every TPMS supplier claims “real-time monitoring.” Few explain what actually happens between a tire losing pressure and a driver seeing an alert on the dashboard. For fleet buyers and distributors evaluating suppliers, that gap matters — because the difference between a sensor that reads accurately at highway speed and one that lags behind a fast leak is the difference between a system that prevents a blowout and one that simply logs it after the fact.

This article walks through the engineering inside every GRUNDIG TPMS system — from sensor sampling to signal transmission to display logic — so wholesale buyers understand exactly what they are sourcing when they browse the current TPMS lineup.

What “Real-Time” Actually Means

In TPMS marketing, “real-time” is used loosely. On a GRUNDIG system, it refers to a fixed sampling and transmission cycle: each sensor measures pressure and temperature continuously and transmits an update at regular short intervals, with faster reporting automatically triggered the moment a reading moves outside its normal range. That means a slow leak is caught during routine monitoring, while a rapid pressure drop — the kind that precedes a blowout — is flagged immediately rather than waiting for the next scheduled update.

That accuracy figure is not incidental. A sensor reading that drifts by even half a BAR under heat cycling produces false alarms — and false alarms are the fastest way to get a TPMS system ignored by drivers. GRUNDIG sensors are calibrated to hold ±0.1 BAR accuracy across their full operating temperature range, from sub-zero winter starts to sustained highway heat buildup.

Direct vs Indirect: Why GRUNDIG Builds Direct-Sensing Systems

TPMS technology splits into two approaches. Indirect systems infer pressure loss from wheel-speed differences picked up by the ABS system — cheap to implement, but blind to gradual pressure loss and unreliable across multi-axle commercial configurations. Direct systems, which is what every GRUNDIG product uses, place a physical pressure sensor at each wheel position, either internally on the valve stem or externally as a cap-mounted unit.

Direct sensing is the only approach that scales to commercial applications. An indirect system cannot meaningfully monitor 12 or 24 individual wheel positions on a heavy truck; a direct system reports the exact pressure and temperature at every single position, independently. This is why every serious commercial TPMS supplier — GRUNDIG included — builds exclusively on direct sensing.

Internal vs External Sensors: Matching the Application

Within direct sensing, GRUNDIG offers both internal (in-valve) and external (cap-mounted) sensor formats, and the right choice depends on the vehicle and the buyer’s operating environment.

Internal Sensors

Mounted inside the tire on the valve stem, internal sensors are protected from theft, road debris, and accidental impact. They require the wheel to be broken down for installation, which makes them best suited to OEM fitment, tire shop installs, or fleet vehicles already scheduled for tire service.

External Sensors

Screwed onto the valve stem exterior, external sensors install in minutes without removing the tire — the preferred format for aftermarket retrofits, rental fleets, and dealers who need to demonstrate a fast, low-labor installation. The trade-off is slightly higher exposure to impact and, on some models, a marginally shorter battery life due to the compact form factor — a topic covered in more depth in our breakdown of what actually determines TPMS sensor battery life.

Distributors sourcing across the full commercial range typically stock both formats, since fleet buyers frequently ask for a recommendation based on their maintenance schedule rather than committing to one format across an entire operation. For a closer look at how this plays out for fleets weighing factory-fitted systems against retrofit options, see our guide to OEM versus aftermarket TPMS sourcing.

Signal Transmission: Solving the Long-Vehicle Problem

Wireless range is a genuine engineering constraint on long vehicles. A signal that transmits cleanly across a 4-wheel passenger car can degrade significantly by the time it reaches the rear axle of an articulated truck-trailer combination, especially when the signal has to pass through or around a steel chassis. GRUNDIG’s commercial-grade sensors transmit at a baseline range exceeding 100 meters in open conditions, and for configurations where that isn’t enough — long-haul semis, multi-trailer combinations, 24-wheel heavy truck setups — a dedicated signal repeater is built into the system architecture to relay sensor data reliably to the in-cab display.

Why Certification Isn’t Optional

Every GRUNDIG TPMS product carries CE certification for the European market and FCC certification for North America, covering the complete system — sensors, receiver, and repeater — under a single declaration of conformity. For wholesale buyers, this isn’t a checkbox: fleet procurement departments increasingly require documented compliance before a safety-related component can be approved for purchase, and supplying uncertified hardware creates a liability that most serious fleet operators simply will not accept.

The Engineering Summary

Element	GRUNDIG Specification
Sensing method	Direct pressure and temperature sensing at each wheel
Accuracy	±0.1 BAR
Wireless range	100m+ (extendable via repeater)
Ingress protection	IP67
Operating range	−40°C to 125°C
Certifications	CE (EU/UK), FCC (North America)

This is the engineering standard behind every product in the GRUNDIG TPMS lineup, from the four-sensor AN15 for light commercial vehicles through to the 24-sensor S05 built for heavy long-haul fleets. For distributors, that consistency across the range matters as much as any single spec — it means every product carrying the GRUNDIG name meets the same baseline, regardless of which configuration a customer needs.