two split-ring sensors are fitted to two Franz cells so that one
could function as a reference sensorifrequired(withnoadded
interferents). The bath is set to 37
C providing a mean sensor
temperature of 34
C. Furthermore, no stirrer bar is used due to
its interference with the microwave sensor, caused by the move-
ment of its high permeability magnet material. A photograph of
an individual sensor and Franz cell arrangement and the pair of
sensors immersed in the thermal bath are shown in Fig. 11.