Why Indutrade’s Rotronic HygroFlex HF5 keeps critical rooms under quiet control

Reviewed: ad hoc news Software & Services desk. Edited and checked on 2026-06-18, 09:10. Details in the imprint.

The Rotronic HygroFlex HF5 from Indutrade is one of those devices you barely notice until it fails - sitting on a cleanroom wall, quietly watching humidity and temperature while everyone else focuses on the process.

What the HF5 is built to do

The Rotronic HygroFlex HF5 is a modular HVAC transmitter for measuring and transmitting relative humidity and temperature in demanding environments such as cleanrooms, laboratories and production lines. It is typically mounted permanently on walls or ducts.

Depending on the probe used, the HF5 covers a temperature range from -100 °C up to 200 °C and delivers humidity measurement with a typical accuracy of ±0.8 %RH. That is well within the range required for regulated pharmaceutical and food applications.

Modular probes and digital outputs

The HF5 accepts interchangeable HygroClip2 probes via a digital interface, which means users can swap or calibrate probes without taking the whole transmitter out of service. This is a practical advantage when downtime is expensive.

On the output side, the device offers two analog signals and an optional digital Modbus interface for direct integration into building management systems or PLCs. For many buyers, that mix of old-school 4-20 mA and modern fieldbus is exactly what keeps retrofits simple.

Installation, housing and daily handling

The HF5 comes in a compact IP65-rated housing designed to cope with dust and splashing water, which helps when it is installed in industrial halls or near process lines. The front is deliberately clean, with only a status LED and connection to the probe.

In daily use, technicians interact mostly via configuration software and a USB service interface instead of buttons on the housing. That keeps the enclosure sealed, but it also means spontaneous on-site adjustments need a laptop and the right cable.

Calibration and compliance angle

Rotronic emphasizes traceable calibration, offering multi-point factory calibration certificates and the option to integrate the HF5 into ISO 17025-compliant calibration workflows. For pharmaceutical users under GMP rules, that is often a hard requirement rather than a nice extra.

The transmitter can be combined with Rotronic’s HW4 software for monitoring, alarming and documentation of humidity and temperature trends. That turns a simple wall device into part of a broader validation-ready monitoring system, including audit trails and reports.

Where the transmitter has limits

The HF5 is clearly a specialist for accurate measurement - it has no large local display and is not meant as a handheld instrument. Anyone wanting to read values directly on site will likely pair it with other Rotronic devices or rely on the control system.

Another point to check closely is probe selection and cable lengths: extreme temperatures or aggressive chemicals require specific probe types and sometimes protective filters, which adds cost and planning effort. Buyers who treat it as a plug-and-play gadget may be disappointed.

How it fits into Indutrade’s portfolio

Rotronic was acquired by Indutrade to strengthen its measurement and sensor technology segment, giving the group deeper access to regulated pharma and industrial customers. Products like the HygroFlex HF5 are classic examples of Indutrade’s long-term, niche-focused approach.

Shares of Indutrade AB (SE0001515552) trade on Nasdaq Stockholm in Swedish kronor.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.