ACCESSORIES

   The temperature controller Model MN82VT allows for maintaining precise ESR sample temperatures. Included are a special quartz dewar-insert sample holder (containing a miniature thermocouple-heater assembly), a stainless steel liquid nitrogen dewar, and an N₂ gas transfer system. The quartz dewar-insert sample holder can also be supplied with an appropriate fitting for use on Model 8400 cavities.

   The MN82VT is equipped with a manual gas-flow control, a flow gauge, and a safety interrupt sensor for auto shutdown. A platinum thermocouple and miniature heater assembly are incorporated onto the quartz dewar-insert sample holder. Heat transfer is accomplished via N₂ which is heated to the set point just prior to contact with the sample. Cooling is achieved first by immersion of N₂ gas into a stainless steel dewar holding liquid N₂. This cold N₂ is subsequently heated to the desired temperature. Temperatures are adjustable between -150 C to 100 C and are stable to +/- 1C.