2022-08-17
Ho Chi Minh City, Vietnam – August 8, 2026 – HERTZINNO (Shanghai Lianfeng Xunsheng), a global leader in industrial acoustic and thermal imaging inspection solutions, today announced the successful field demonstration of its flagship product, the HA3T handheld acoustic‑thermal imaging camera, at Lee & Man Paper’s manufacturing facility in Vietnam. During the two‑day on‑site trial, the HA3T was deployed in two critical maintenance scenarios – compressed air leak detection in rotary compressors and temperature anomaly screening in electrical distribution cabinets – delivering outstanding accuracy and efficiency that earned high praise from the customer’s technical team.
Lee & Man Paper is one of the world’s largest containerboard and pulp producers, listed on the Hong Kong Stock Exchange (stock code: 02314). With multiple production bases across China (Guangdong, Jiangsu, Chongqing, Jiangxi, Guangxi) and Southeast Asia (Vietnam, Malaysia), the group has an annual capacity exceeding 9 million tonnes. In paper manufacturing, compressed air systems power pneumatic actuators, instrument controls, and dryer sections; even small air leaks cause significant energy waste and potential safety hazards. Meanwhile, electrical cabinets serve as the nerve centre for power distribution – abnormal temperature rises often signal overload, poor contact, or incipient faults. Traditional inspection methods rely on manual walk‑downs and scheduled thermography, which struggle to pinpoint hidden issues early or provide visual localisation.
Acoustic‑Thermal Fusion – One Tool, Multiple Uses
The HA3T is HERTZINNO’s third‑generation handheld acoustic‑thermal imager, combining a 144‑channel low‑noise MEMS microphone array with a 640×512 pixel high‑resolution infrared thermal module. It supports a wide frequency range from 2 kHz to 150 kHz, capturing both audible and ultrasonic signals. The thermal camera operates in the 8–14 μm long‑wave infrared band, with a NETD ≤40 mK and a measurement range from –20 °C to 550 °C. Acoustic and thermal data are fused in real time and displayed on a single 5‑inch touchscreen, enabling inspectors to simultaneously locate gas leaks, diagnose mechanical faults, and screen for thermal anomalies in a single pass.
Compressor Leak Detection – Pinpointing “Invisible” Leaks
Inside the mill’s compressed air station, the HA3T scanned multiple operating industrial compressors and their piping networks. During the scan, the 144‑channel MEMS array successfully captured ultrasonic emissions from a small leak at a pipe joint – a source that conventional listening methods had failed to detect. The device’s built‑in beamforming AI algorithm effectively suppressed the high‑background noise (exceeding 85 dB) typical of a paper mill, and the real‑time acoustic heatmap overlaid the optical image with a bright colour‑coded spot that precisely identified the leak location. According to HERTZINNO’s technical specifications, the HA3T achieves a spatial resolution of ≤1 cm at 1 m (at 40 kHz) and a gas‑leak sensitivity better than 0.049 L/min at 120 kPa from an 8‑m distance. This level of precision allows maintenance crews to pinpoint the exact source immediately, eliminating the inefficiency and guesswork of soap‑water tests or stethoscope‑style listening.
Electrical Cabinet Thermal Inspection – Detecting Hidden Hot Spots
In the electrical room, the HA3T’s thermal imaging function was used to inspect multiple live distribution cabinets. The 640×512 infrared sensor, combined with ≤40 mK thermal sensitivity, produced a clear temperature distribution map of all connection points, busbars, and circuit breakers. Inspectors quickly identified one terminal block with an abnormal temperature rise – significantly hotter than surrounding areas – indicating possible increased contact resistance or a loose bolt. This finding validated the HA3T’s practical value for predictive electrical maintenance, enabling the plant to address a developing fault before it could cause an unplanned outage.
Customer Feedback and Industry Impact
The maintenance manager at Lee & Man Paper Vietnam commented: “The HA3T combines acoustic localisation and thermal imaging into one handheld device, allowing us to tackle both leak detection and thermal screening in the same inspection round – two persistent challenges we used to handle with multiple tools and hours of work. The acoustic‑thermal overlay is so intuitive that even less‑experienced technicians can quickly interpret the results.”
HERTZINNO views this successful demo as a significant milestone for the HA3T in the pulp and paper sector. As a pioneer in acoustic‑AI inspection instruments in China, the company’s products have been widely adopted in power, petrochemical, mining, and automotive industries, serving over 200 customers worldwide. In 2025, HERTZINNO’s acoustic imager was included in the Ministry of Industry and Information Technology’s Recommended Catalogue of Advanced Safety and Emergency Equipment (Industrial Sector 2025 Edition) – one of only three domestic suppliers to receive this recognition. Moving forward, HERTZINNO will continue to advance intelligent inspection solutions for predictive maintenance and operational safety across power, petrochemical, pulp & paper, and other process industries.