Dew point measurement, 4 dew point measurement – ROTRONIC MBW 473 User Manual
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MBW473_MANUAL_E_V2.0
5
2.4 Dew Point Measurement
When you switch on the 473, all readings on the display may initially be blank. If your instrument is
equipped with a pressure sensor, the pressure reading will be displayed. After connecting the measur-
ing head or temperature probe you will get an external temperature reading. To measure humidity
(dew point, frost point, %RH, etc.), the Dew/Frost Control mode must be enabled and gas must be
flowing across the mirror. If %RH readings are required, an external temperature probe must be con-
nected. To connect the external temperature probe, see
section ‘External Temperature Probe’ on
page 11. Alternatively, a fixed external temperature may be entered via the touch screen. Please fol-
low the instructions in section 5.2
You can test the 473 dew point measurement by measuring the dew point tem-
perature of the room.
First, make sure the measuring head is connected to the back panel of the 473.
Next, start the measurement by pressing the Dew/Frost Control key. This button
enables the system to cool the mirror to the dew or frost point temperature, moni-
tor the thickness of the condensation layer on the mirror, and precisely adjust the
mirror temperature to maintain a stable condensation layer. When Dew/Frost Con-
trol is enabled, the indicator on the key will turn green and the dew or frost point
temperature display will begin to show the mirror temperature as it cools to the
condensation point.
See section 4.2
‘Selection of indicated Parameters’ for information on selecting
the parameters you wish to have displayed.
Fan
The SH2 measuring head is equipped with a fan to pull a gas sample across the
measuring head. If you are using the SH2 measuring head, press the Fan key on
the touch screen to turn the fan on/off. For further information on the fan refer to
section 3.3
Fan