ROTRONIC MBW 373 - Manual (Page 34)

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External Hose Heat
The 373H and 373HX systems are equipped with controls for externally connected heated
hoses. These external heated hoses allow sampling of gas with a dew point temperature that is
higher than room temperature. The external heated hoses are used in conjunction with head,
block, and inner tube heater control. Use of an external heated hose connected to the Gas Input
is required for high dew point measurements. Connection of a heated hose to the Gas Output is
optional and depends on the application. Both hoses are maintained at the same temperature,
independent of the head, block, and inner tube temperature.
When measuring frost point temperature, or dew point temperatures below approximately 20°C,
no heating is required and the external hose heaters may remain off. When measuring dew
point temperatures above 20°C, or above your room temperature, external hose heating is
required on at least the Gas Input. Your unit needs to be equipped with the proper external hose
heating controls. In addition, your should enter a suitable external hose setpoint and enable
heating control. To set the external hose setpoint and enable heating, see Heater Controls on
page 17. Note that only 373H and 373HX systems are equipped with external hose heater
controls.