TDR series transducers are working on a force balance principle and have been realized to measure level of liquids in open vessels or pressure in closed systems. The models TDR1, TDR13 and TDR15 are especially used in the pulp and paper industry. The pneumatic output signal ratio is 1:1 with the measured variable. They are used in connection with the pneumatic receivers and/or pressure switches installed locally or on control panels for indication alarm, or in connection with pneumatic controllers for analog pneumatic control of level and pressure.
