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Extech Instruments RH390, User Manual

The Extech Instruments RH390 is a high-quality digital hygrometer that accurately measures humidity levels in indoor environments. Ensure optimal comfort and air quality by downloading the free user manual from our website to learn how to operate this essential device effectively.

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User's Guide

Digital Psychrometer

Model RH390

MAX

MIN

°F•°C•WBT

Dew Point

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Summary of Contents for RH390

Page 1: ...User s Guide Digital Psychrometer Model RH390 MAX MIN F C WBT Dew Point...

Page 2: ...20 to 70 o C 4 0 to 158 0o F 1 o C 1 8o F 30 0 to 19 9 o C and 70 1 to 100 0o C 22 0 to 3 9o F and 158 1 to 199 0o F 1 5 o C 2 7o F Display Dual LCD Response Time 30 seconds 90 of final value in movin...

Page 3: ...utton 5 MIN MAX button 6 HOLD Backlight button Note The battery compartment is located on the rear of the instrument Display Description 1 Relative Humidity 2 Dew Point 3 Wet Bulb 4 C F 5 Temp WB DP D...

Page 4: ...tive Humidity measurement appears in the top display 4 Pressing the F C WBT Dew Point button toggles the lower display between Temperature F Temperature C Dew Point C Dew Point F Wet Bulb C and Wet Bu...

Page 5: ...emperature measurements 1 To select the temperature measurement press the F C WBT Dew Point button until C or F appears in the lower right 2 Temperature is now displayed Data Hold Press the hold butto...

Page 6: ...is registered To exit the MIN MAX mode press and hold the MIN MAX button for 2 seconds until the MAX or MIN icon disappears Note Readings are automatically reset when switching from one display to the...

Page 7: ...screw holding the rear battery compartment cover to access the battery compartment Ensure that the compartment cover is securely fastened when finished You as the end user are legally bound Battery or...

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