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Material moisture sensor tri²dent "moist"
📋 The task
Drying processes are among the most energy-intensive process steps in many industries. If drying is too long or too intensive, energy consumption increases unnecessarily; if drying is too insufficient, residual moisture can lead to quality problems. Inline moisture measurement provides the data basis for continuously and precisely controlling drying processes – instead of relying on random samples or fixed drying times.
This can also make a positive contribution to reducing energy costs in the energy-intensive processes in the press and/or drying group.
For general information on this topic, please also visit our guide.
⚠️ The practical challenges
- High temperatures in or around the dryer
- High moisture also due to evaporation
- Contaminants can accumulate on the measuring head and impair the measurement.
- High dust levels can even necessitate the use of ATEX-compliant measuring instruments.
❌ Why standard sensors fail
Conventional optical sensors with integrated electronics cannot withstand the thermal conditions, or only at high operating costs for cooling. Many sensors are only calibrated for a narrow measuring range or struggle with high moisture.
Sufficient installation space, safety concerns (mounting above the paper web), the sometimes high contamination from fiber flight, and measurement on a screen background are further conditions that hinder the use of alternative sensors.
✅ The Sensorik Austria solution: tri²dent “moist”
tri²dent “moist” (pronounced tri-eident) enables non-contact moisture measurement before, during or after a drying process.
Thanks to its fiber optic design, the system can be used even in challenging measurement situations, such as high temperatures and with a comparatively long working distance (10 cm). The sensor electronics are placed away from the high temperatures, and the light signals are transported to the measurement point and back via fiber optics. Thanks to our multi-channel technology, tr²dent "moist" offers high measurement accuracy and a wide measurement range.
| Technical information | tr²dent “moist” |
|---|---|
| Measuring principle | Near-infrared (SWIR) |
| Measuring range | 0..~60% moisture (outside wet phase) |
| Accuracy | product-dependent |
| Resolution | 0,1% |
| measuring time | einstellbar |
| Measuring distance | Depending on the application, up to 100 mm |
| light source | SWIR LED |
| detector | photodiode |
| Ambient temperature | Sensor up to 40 °C, sensor head up to 200 °C |
| tension | 24 VDC |
| outputs | up to 4 analog (4…20 mA) |
| Class | IP54K |
Application examples:
- Measurement of residual moisture before extruder or similar.
- Moisture measurement of agricultural cuttings
- Moisture measurement after coating systems
- Moisture measurement in roasting processes
- Measurement/monitoring of condensation on surfaces
- and much more
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Frequently Asked Questions
For which materials can tri²dent "moist" be used?
The tri²dent “moist” has already been used to measure moisture content in a wide variety of materials. In some cases, developing a separate measurement curve may be helpful or even necessary.
Monitoring of condensate on surfaces has also been successfully implemented.
Can tri²dent "moist" moisture sensors also be used inside a dryer?
Yes, fiber optic systems make it possible to mount the electronic components outside the hot area – only metal and glass remain at the measuring point.
As a result, the tri²dent “moist” requires very little installation space at the measuring point.
What is the maximum fiber length possible for tri²dent "moist"?
The fiber optic cables (FOC) for tri²dent “moist” can be up to 6m in length.
Can tri²dent "moist" moisture sensors also be used in ATEX areas?
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How do the tri²dent "moist" sensors cope with high moisture?
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