Measurement of the fabric temperature
The pyrometer measures temperatures from 0 - 250°C on running webs in stenter frames or dryers.
The Thermosense HP270 is used for non-contacting temperature measurement in driers and stenters and records the temperature of running product webs. The sensor is temperature-resistant up to 270 °C.
It can therefore be mounted inside driers.
- Non-contacting product temperature measurement
- High-temperature-resistant sensor up to 270 °C
- Maximum measuring accuracy
- Higher machine utilisation
- Increased quality
- Energy saving
- Process transparency
Stenter frame as black box
Without exact knowledge of what’s happening during a fixing, thermo-isolating, condensing or gelling process in the chambers, the drier has to be considered a black box. The user needs to solely rely on his experience and must determine settings for circulating air temperature and stenter speed empirically.
To ensure repeatable processes, application of appropriate measuring techniques in the drier chambers is essential. High-temperature measurement with the Thermosense HP270 is a decisive factor at this.
The sensor (infrared pyrometer) utilises the heat radiated by the measuring object for the non-contacting determination of the current product temperature. This in turn impacts a thin metal film on the probe. The temperature of the film and the sensor head is measured.
The temperature of the measuring object is determined from both values with ultimate accuracy.
Dwell time measurement
To determine the dwell time for a desired product temperature, the surface temperature of the product is measured without contact at several locations in the dryer using the high-temperature-resistant HP270 sensors. The system thus determines reaching of the preselected target temperature with utmost precision.
Depending on the product properties (material composition, product weight, initial moisture) the nominal temperature is reached at different points in the dryer, so that multiple sensors are required (normally 3 to 8, max. 64), to ensure adequate definition of the temperature trend.
If the web speed is known, this can be used to determine and thereby regulate the time period during which the product is subjected to a given temperature.