HUMY 301
The HUMY 301 uses a capacitive measuring method that determines the entire water content of a material – and not just its surface. To do this, the sensor’s field lines penetrate up to 200 mm deep into the material. The measurement result has an accuracy of up to 0.1 % – depending on the bulk material and measurement situation.
Measure. Monitor. Repeat.
For better insights, better decision-making and better process performance.
Key Features & Benefits
- Real-time monitoring of product moisture
- No laboratory samples necessary
- The maximum permissible water content of a product can be safely maintained; this increases quality and reduces costs
- Saves energy by controlling the drying process
- Very accurate measurement results (up to 0.1 % accuracy, depending on the material)
- Measures the total water content, not just the surface
- Robust design, suitable for extreme environmental conditions
- Encapsulated sensor, protected against humidity and vibrations
- Highest ATEX classification (dust: zone 20; gas: zone 0)
- Simple installation and retrofitting, e.g. on conveyor belts, screw conveyors, pipes and chutes

Typical Applications
Many companies rely on laboratory testing, which:
- Is time-consuming
- Provides delayed results
- Is based on random sampling
- The HUMY 301 inline moisture measurement system offers a superior alternative
- Provides real-time, continuous moisture measurement
- Enables immediate response to moisture changes in the process
Measurement data can be used to:
- Control dryers
- Enable automatic humidification
- Continuously monitor and optimise the process
Properties
The sensor of the HUMY 301 is very robust and can be used flexibly. Sensor surfaces made of POM, Teflon and ceramic are available to process abrasive or aggressive materials. A high temperature option and an ATEX option for Zone 20 or Zone 0 are available.
More info
The device is equipped with an analog output and an RS485 Modbus interface. Windows software is used for calibration and analysis. Up to 24 calibration data sets can be stored, sixteen of which can be selected directly via digital inputs.
The HUMY is optimized for reliability and a long service life. Each sensor is sealed and tested under extreme temperatures. A self-monitoring function continuously checks the functionality of the device. It is therefore not surprising that HUMYs are used in extreme environments, e.g. in vibration channels
New functions
- Detailed analysis options through graphical user interface
- User-friendly calibration and parameterization
- Extended batch mode function
- Additional digital inputs, e.g. for product switching, up to 16 products
- Faster data acquisition thanks to new microprocessor
- Long-term data storage for offline analysis and offline calibration
- Simultaneous display of 8 measured values / measuring systems

| Parameter | Specification |
|---|---|
| Housing material | Stainless steel (1.4301 or 1.4307 optional) |
| Sensor surface | K = POM C = Ceramic (optional) T = Teflon (optional) S = Ceramic + Teflon (optional) |
| Environment temperature | 0°C to +70°C (K/C version) 0°C to +80°C (T/S version) |
| Process temperature | 0°C to +90°C (non-ATEX) 0°C to +120°C (non-ATEX with high temperature option) 0°C to +70°C (ATEX with K/C) 0°C to +90°C (ATEX with T/S) |
| Process pressure | 6 bar (temporarily up to 10 bar) |
| Protection class | IP67 |
| Outputs | RS485 for connection with the transmitter |
| Cable | Shielded 4-pole cable, 3 m standard (up to 500 m on request) |
| Dimensions | 100 mm × 51.5 mm |
| Weight | 1300 g |
Why Choose Process Networks?

ISO-Certified Quality
Our ISO 9001:2015 quality management system ensures full traceability across design, installation, calibration and support.

Technical Expertise You Can Reach
When you contact us, you speak directly to an expert — not a call centre.

Trusted Supplier Partnerships
Exclusive access to premium instrumentation from leading global manufacturers in Germany, Japan, the US and across Europe.

Long-Term Support & SLAs
Most customers stay with us for years because we stay with them providing ongoing maintenance, calibration and on-site service.

Proven Field Experience
Thousands of instruments installed and tens of thousands points monitored daily on systems we support.









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