Asphalt mixing plants and asphalt pavers

In asphalt production, process temperature is a crucial factor in plant performance and the properties of the hot mix. To ensure long-term quality of the road surface, temperatures must be precisely monitored during the production process and as the hot mix is loaded onto trucks. 

Common to all asphalt plants are the severe environmental conditions. A temperature detection device will be exposed to hot and aggressive vapours and dust. 


Dryer drum exit (1)

In asphalt production, a crucial process parameter is the temperature of the mineral aggregate and the reclaimed asphalt pavement (RAP). As these materials enter the dryer drum, their temperatures can vary depending on weather conditions. To ensure that temperatures remain within specified limits as teh material is fed to the mixer, temperatures are monitored at the point where the material exits the drum. Burners are controlled based on this data.


Mixer discharge and truck loading operations (2)

The hot asphalt mix is discharged directly from the mixer or from the hot mix storage silo onto trucks that deliver the asphalt to the road construction site. In order to achieve uniform quality and long-term performance of the road surface, it is essential that the hot mix exhibits a specific temperature as it arrives at the job site and when road paving operations begin. Asphalt temperatures are thus monitored and documented as the hot mix is loaded onto delivery vehicles.


Asphalt paver (3)

It is essential to strictly observe the temperature limits when placing the mix to obtain a quality-oriented compaction and a satisfactory interface bonding. Whether the requirements can be met with the existing mix must be weighed up and decided at the construction site. In any case, all essential parameters, such as the temperature, have to be recorded to have a means of proof on hand if required at a later date. Therefore, the temperature of the mix is determined at the moment when the mix is dumped into the paver.


Solution

Pyrometers are ideal for monitoring temperatures of a hot liquid material. A pyrometer detects the infrared radiation emitted from an object at a safe distance, without surface contact, an produces an accurate temperature reading. 

Most commercially available pyrometers will not hold up to the aggressive furnes and dust present at asphalt mixing plants. Lenses are especially sensitive to such harsh industrial environments. The CellaTemp PK 18 infrared thermometer was especially designed for use at asphalt and concrete plants and features a stainless steel housing as well as a special lens whose surface is highly resistant to impurities. When combined with certain fittings and accessories such as an air purge and sighting tube, the PK 18 provides many years of reliability and precision. At proper operation the measuring system works maintenance and wear-free.
The integrated digital display is very convenient during commissioning and plant maintenance procedures. 

During overhead load out onto trucks, a temperature reading is recorded for each load and saved in the plant's data acquisition system as a matter of quality control and verification.




CellaTemp® PK 18 AF 1

 Range  0 - 500 °C 
 Output  0/4 - 20 mA / switching output
 Adjustable parameters  emissivity, smoothing filter, peak picker, key lock, 
 temperature °C / °F, temperature simulation,
 test function
 Dimensions  Ø 30 x 183 mm
 Mounting  M30 x 1.5 mm x 35 mm thread
 Power requirement  24 V DC 
 Display  4-digit LED display (digit height 8 mm)
 1 x LED switching status
 1 x LED temperature unit
 Protection  IP 65 (splash-proof) 
 Housing material  V2A (1.4305) 

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Measuring System CellaAsphalt

Reliable and maintenance-free temperature measurement at asphalt mixing plants and asphalt pavers

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