Fluke TiS75 PRO Thermal Camera 25° Telephoto | Long-Range HV Inspection | Australia

When the Distance Isn’t Optional

In Australian electrical infrastructure, there are inspections where the rules of safe work don’t allow you to get close. High-voltage switchyards operating at 11 kV, 33 kV, or 66 kV. Overhead distribution equipment on poles and towers. Large power transformers where the only safe approach is from outside the exclusion zone. Substation equipment in live bays.

For these applications, a standard 42° wide-angle thermal imager doesn’t cut it. At 10 metres, the spatial resolution of a wide-angle camera degrades to the point where individual component anomalies become difficult to distinguish — the image lacks the detail needed to say whether a termination is showing genuine overheating or simply emissivity variation in the surrounding structure.

The Fluke TiS75 PRO with 25° telephoto lens is the answer. Same sensor, same radiometric accuracy, same intelligent workflow platform — but with a narrower field of view that puts your full detector resolution onto a smaller target area at extended range. The result is thermal images with the detail and confidence you need to make maintenance decisions from a safe distance.

What the 25° Lens Actually Changes

The move from 42° to 25° field of view does more than just zoom in. It fundamentally changes the spatial resolution — the ability to resolve small temperature differences across small targets at distance.

The TiS75 PRO with 25° lens achieves an IFOV (instantaneous field of view) of 1.14 mRad — compared to 1.91 mRad with the 42° lens. In practical terms, this means that at 10 metres, the 25° lens can resolve a target approximately 11 mm across, versus around 19 mm with the wide-angle lens. For high-voltage terminations, cable cleats, transformer tap changers, or overhead conductor joints, that difference is the gap between a diagnostic-quality image and an ambiguous one.

The camera supports 1–4× digital zoom on top of the optical advantage — giving you flexibility to frame specific components of interest within the scene during inspection.

Built for High-Voltage and Long-Range Applications

High-Voltage Switchyards and Substations Thermal inspection of live HV equipment is a standard part of preventive maintenance programs for Australian electricity network operators, industrial facilities with their own substations, and large commercial sites with 11 kV or higher supply infrastructure. The TiS75 PRO 25° configuration allows inspections from behind exclusion zone fencing or from safe approach distances as specified in AS 4836 (Safe Working on or Near Low-Voltage Electrical Installations) and network operator safe work method statements.

Overhead Distribution and Transmission Equipment Pole-mounted transformers, overhead isolators, conductor joints, and line hardware on distribution networks are inspected thermally as part of network asset management programs. The 25° lens and 5–20 metre working range capability make ground-level inspection of pole-top equipment practical without elevated access.

Large Power Transformers and Reactors Transformer thermal surveys typically require inspections of radiator banks, cooling fans, bushings, and tap changers from outside the transformer compound. The 25° telephoto lens provides the spatial resolution needed to identify individual components showing thermal anomalies at the distances commonly encountered in transformer yard inspections.

Industrial Plant — Large Equipment and Elevated Assets Rotating machinery on elevated platforms, overhead conveyor drives, rooftop HVAC equipment, and large motor frames where safe access requires a platform or working at height can often be inspected thermally from ground level with the 25° lens — reducing the need for elevated access and the associated WHS considerations.

Solar Farm Inverter and String Surveys Large-scale solar installations often involve inverter stations and combiner boxes positioned on elevated platforms or at distances beyond the practical range of a wide-angle lens. The TiS75 PRO 25° configuration allows detailed thermal inspection of these assets from ground level, supporting CEC-accredited installer maintenance programs and IEC 62446-1 thermal inspection requirements.

The Same Powerful Platform — Distance Added

Beyond the telephoto lens, this is the same TiS75 PRO that brings the full range of PRO-series workflow capabilities.

Dew Point Calculation — relevant for outdoor inspection scenarios where ambient humidity affects the interpretation of thermal anomaly findings. Understanding dew point context helps differentiate genuine thermal faults from moisture-related emissivity effects on outdoor equipment surfaces.

Fully-Radiometric Streaming to PC — connect via Type-C and stream live radiometric data to a connected computer for continuous monitoring, R&D, or integration with PC-based analysis platforms. Unique to the TiS75 PRO within the TiS PRO series.

50 Preset Measurement Profiles — including the ability to save specific profiles for HV inspection scenarios with appropriate emissivity, background temperature, and distance corrections pre-configured. The 3-phase temperature difference calculation is built in and accessible via the ACTION button preset system.

QR Code Asset Tagging and Route Inspection — even at a distance, the camera can scan QR codes on equipment for automatic image naming. Route inspection guides technicians through a defined asset list, ensuring completeness and consistent documentation across large infrastructure inspection programs.

Wireless Image Transfer — images move to a phone or tablet via the camera’s Wi-Fi hotspot as soon as they’re captured, supporting real-time reporting and supervisor review without returning to a vehicle or office.

Why the TiS75 PRO, Not Just Any Telephoto Camera?

Telephoto thermal optics amplify the detector’s spatial resolution advantage — so the underlying detector quality matters enormously. The TiS75 PRO’s 384×288 detector combined with the 25° lens produces a 1.14 mRad IFOV, which puts it in territory previously requiring significantly more expensive instruments. Add SuperResolution enhancement to 768×576 and you have a camera capable of producing detailed, report-quality imagery from distances that would be impractical with a lower-resolution sensor.

The ±2°C / ±2% measurement accuracy, ≤40 mK thermal sensitivity, and NATA-traceable calibration availability mean the temperature readings you’re making at distance are as defensible as those made up close — important when the findings inform maintenance decisions on high-value or safety-critical assets.

Australian Compliance & Certification

The Fluke TiS75 PRO carries RCM certification (IEC 61326-1) for the Australian market. Safety is rated to IEC 61010-1 pollution degree 2. The camera’s operating temperature range of -10°C to 50°C covers Australian field conditions from alpine infrastructure to tropical industrial sites.

For Australian electrical network operators, utility maintenance contractors, and industrial facilities teams operating under formal thermographic inspection programs, NATA-traceable calibration is available to maintain measurement traceability in line with quality management system requirements.

The 2-year manufacturer warranty is included. No product registration is required.

Technical Specifications

In the Box: TiS75 PRO thermal imager (25° telephoto lens), 2× Li-ion batteries, 2-bay battery charging base, 65W Type-C charger with interchangeable plug adaptors, Type-C charging/data cable, 64 GB SD card, adjustable hand strap, soft transport bag, hard carrying case, Fluke Connect Express software (free download).