Rotronic MBW 473 Manual do Utilizador descarregar pdf (Página 9)

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 ‘External Temperature’.

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 ’Measuring Heads’.

Fan

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Rotronic MBW 473 Manual do Utilizador Página 9