Peter Hirt: Reducing Measurement Noise through Near-Sensor Digitisation

Industrial automation leaders are confronting a quiet yet persistent problem within modern production lines: measurement accuracy degrades long before mechanical systems reach their physical limits. Electrical noise, aging analog infrastructure, and skills gaps around calibration undermine confidence in data that increasingly drives closed-loop control and quality assurance. As factories modernize, the weakest link is often the last meter between the physical measurement point and the digital control system. Addressing that gap now defines the difference between incremental improvement and sustained precision. Measurement solutions that still depend on long analog signal paths expose plants to interference from welding robots, drives, and power electronics. Shielded cabling, amplifier cards, and manual tuning can mitigate risk, yet these measures add cost and complexity while remaining vulnerable to drift and human error. Digital communication alone does not resolve this issue if the analog-to-digital conversion occurs too far from the measurement point. Precision depends on where that conversion happens and how tightly calibration is controlled across the entire signal chain. A second pressure comes from workforce change. Expertise in configuring analog measurement systems is retiring faster than it is replaced. Maintenance teams increasingly favor systems that integrate directly into existing PLC environments, behave consistently across sensor variants, and reduce dependence on specialist intervention. Measurement technologies that preserve mechanical investments while modernizing data interfaces offer a practical path forward, particularly in plants running fixtures designed decades ago. These realities point toward a clear direction. Reliable measurement today depends on integrating signal conditioning as close as possible to the probe, converting data to digital form before noise can distort it, and transmitting that data through an open industrial communication layer that aligns with modern automation architectures. Open standards matter because they protect buyers from vendor lock-in and allow sensors to participate fully in broader data flows, whether feeding PLC logic or higher-level monitoring systems through standard gateways. Mechanical integrity remains equally decisive. Digital output cannot compensate for play, friction, or inconsistent guidance at the measurement interface. Precision hinges on repeatability, which in turn depends on bearing design, surface quality, and assembly discipline. Solutions that combine rolling linear guidance with play-free construction deliver consistent positional data over long service lives, supporting both accuracy and reparability. Longevity is no longer a secondary concern. Buyers increasingly value equipment that can be serviced and returned to specification rather than discarded. Within this landscape, Peter Hirt presents a compelling reference point for organizations evaluating advanced digital displacement measurement. Its approach centers on embedding miniature signal conditioning electronics directly within the probe assembly, converting the analog measurement signal to digital form at the source. This architecture sharply reduces sensitivity to electrical noise and removes the need for complex external conditioning hardware. Digital transmission via IO-Link then carries calibrated measurement data up to ten meters without degradation, after which standard industrial networks extend reach further. The decision to adopt IO-Link as an open interface shapes the broader value proposition. Integration into PLC environments follows established patterns familiar to automation teams, while access to IO-Link gateways enables straightforward data acquisition and edge connectivity through protocols such as OPC UA and MQTT. Parameterization and diagnostics flow through the same channel, simplifying setup and maintenance across diverse applications. Mechanical design reinforces this digital foundation. Ballbearing guidance without axial play delivers high repeatability across both short and long stroke probes, while a standardized eight-millimeter form factor allows direct substitution into existing fixtures. Consistent output scaling ensures that probe replacement does not introduce configuration errors, even during off-shift maintenance. Reparability extends product life and supports sustainability goals without compromising measurement integrity. For executives responsible for precision measurement investments, Peter Hirt stands out as a disciplined choice. It aligns digital communication, calibration control, and mechanical accuracy into a coherent system that reduces risk at the point where measurement matters most. In environments where data quality underpins automation performance, this combination represents a measured and credible benchmark. ...Read more