Extech Instruments RH390-NIST User Manual
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Extech Instruments RH390-NIST User Manual

Digital psychrometer
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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 Extech Instruments RH390-NIST

  • Page 1 User's Guide Digital Psychrometer Model RH390 °F•°C•WBT Dew Point...
  • Page 2 Introduction Congratulations  on  your  purchase  of  the  Extech  RH390  Digital  Psychrometer.  This  device  measures  Humidity,  Air  Temperature,  Dew  Point  temperature  and  Wet  Bulb  temperature.  Advanced features include Data Hold, Auto Power Off, and MAX/MIN reading. Careful use of this  meter will provide years of reliable service. Please visit our website (www.extech.com) to check  for the latest version of this User Guide, Product Updates, and Customer Support.  Meter Description Humidity & Temperature Sensor LCD Display Power ON/OFF button °F/°C/WBT (wet bulb)/Dew Point button MIN/MAX button HOLD/Backlight button Note: The battery compartment is located...
  • Page 3 Operation Power Press the power button( ) to turn power on or off. Taking measurements 1. Hold the probe in the area to be tested. 2. Allow adequate time for readings to stabilize. 3. The Relative Humidity measurement appears in the top display. 4.
  • Page 4 Wet Bulb measurements 1. To select the Wet Bulb measurement, press the °°F/°C/WBT/Dew Point button until WET BULB (°F or °C) appears in the lower right. 2. Wet Bulb temperature is now displayed. °C °F WetBulb Temperature measurements To select the temperature measurement, press the °F/°C/WBT/Dew Point button until °C or °F appears in the lower right.
  • Page 5 MAX MIN Minimum (MIN) Maximum (MAX) Function The MIN/MAX mode allows the user to view only the lowest (MIN) or highest (MAX) readings. Press the MAX/MIN button once and “MAX” appears on the display. The LCD is now displaying the maximum humidity in the top display and the maximum reading of the selected °C °F parameter in the bottom display.
  • Page 6 Maintenance Cleaning and storage 1. The meter should be cleaned with a damp cloth and mild detergent when necessary. Do not use solvents or abrasives. 2. Store the meter in an area with moderate temperature and humidity (refer to the operating and storage range in the specifications chart earlier in this manual).

This manual is also suitable for:

Rh390

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