Acoustic Transmitters 

Our acoustic transmitters are mainly used for tracing wild fish movement and behaviour. Aquacultural research and management are also applications where our tags help make available data which is otherwise impossible to obtain, monitoring welfare and behavioural responses of cultured fish by physiological measurements on individuals. Our transmitters also support measurements directly on submerged moving structures or other physical measurements where wireless data access is important.  

Thelma Biotel's array of standard products encompass a broad range of acoustic transmitters:

  • Standard ID transmitters
  • Acoustic sensor transmitters
  • Coded range-test tags
  • Continuous pingers
  • Frequency modulated, continous pinging sensor transmitters

The effective transmitting range is dependant on the acoustic conditions on the site and this will differ with noise levels caused by wind and rain, water stratification and such. Our tags also put out different signal strength due to the type of battery and the transducer size. Generally the larger tags will be able to transmit up to about 1000 m, while the smaller size tags might be limited to 500 m. The actual range of the tags can be shorter or longer than the above stated figures. As it will differ greatly with conditions out of our control, we don't indicate a set range for each tag but list the tag's measured transmitting power for you to compare. The range will be different from site to site and under different conditions, that is why we urge our users to run a range test in order to obtain at least a rough mapping of the site and to be able to reposition receivers if needed.

Please contact THELMA BIOTEL if you need help in choosing the correct transmitter for you, or have questions regarding tailor made solutions and special adaptations.