Connection of the Probe

It is usual to have the probe physically connected at all times to both the transmitter and the receiver. The electrical circuit acts effectively to couple the probe to the transmitter and receiver when the pulse is respectively on and off (termed duplexing). In solid-state NMR operation the duplexing cireuit should withstand high power rf and 

Moisture, polymer parts Ceramic and glass parts 

As the background is unenriched not normally a problem but for weak MAS signals Zr02 rotors can be seen at 383 ppm 

Ceramic and polymer parts, PTFE tape. Teflon of the coaxial cable 

Glass and ceramic parts, be careful with salt off the fingers 

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The microdialysis probe was used in a shunt configuration, with both flow rates, inside and outside the fibre, set at 50 /u.l/min. The connection of the probe to an FIA system contributed to the easy maintenance of the system because only plugs of milk and yoghurt were in contact with the fibre, which was continuously washed by the carrier solution. 

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