Extech Instruments RH390-NIST User manual

User's Guide

Digital Psychrometer

Model RH390

MAX

MIN

°F•°C•WBT

Dew Point

RH390-EU-EN V2.3 07/13

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

1. Humidity & Temperature Sensor

2. LCD Display

3. Power ON/OFF button

4. °F/°C/WBT (wet bulb)/Dew Point button

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 Display

6. Maximum

7. Minimum

8. Low Battery

9. Hold

10. RH% Display

11. Auto Off

Dewpoint

WetBulb

°C °F

MAX MIN

RH390-EU-EN V2.3 07/13

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. 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 Bulb (°F).

Dew Point measurements

1. To select the Dew Point

measurement, press the

°F/°C/WBT/Dew Point button until

DEWPOINT (°F or °C) appears in the

lower right.

2. Dew Point temperature is now

displayed.

°C °F

Dewpoint

°C °F

RH390-EU-EN V2.3 07/13

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.

Temperature 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 button ( ) momentarily to

freeze the displayed readings.”HOLD” will appear

on the upper left-hand side of the display. Press

the hold button ( ) again to return to normal

operation.

WetBulb

°C °F

WetBulb

°C °F

WetBulb

°C °F

MAX MIN

RH390-EU-EN V2.3 07/13

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

parameter in the bottom display. The display will

not change until a higher reading is registered.

Press the MAX/MIN button again and “MIN”

appears on the display. The LCD is now

displaying the minimum humidity and the minimum second reading in the bottom display.

The display will not change until a lower reading 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 next

(MAX to MIN).

Backlight

Press and hold the light button ( ) until the backlight comes on. To turn the

backlight off press and hold the light button ( ) until the backlight turns off.

Automatic Power OFF

The meter has a default setting that automatically shuts the

meter off after 10 minutes (indicated by the symbol on

the display. This battery saving feature can be disabled. To

disable the auto power off function, simply press and hold

the hold button

( ) while powering on. The symbol will not appear

when auto power off has been disabled. The meter will

revert to the default auto-off mode when powered off.

°C °F

MAX MIN

°C °F

MAX MIN

RH390-EU-EN V2.3 07/13

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).

Battery Replacement

When the battery power falls low, the battery symbol will appear on the LCD. Replace

the 9 Volt battery by removing the Philips head 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 ordinance) to return all used batteries

and accumulators; disposal in the household garbage is prohibited!

You can hand over your used batteries / accumulators at collection points in your

community or wherever batteries / accumulators are sold!

Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the

end of its lifecycle

Specifications

Function Range and Resolution Accuracy

0.0 to 10.0%RH ±3%RH

10.0 to 90.0%RH ±2%RH

Humidity

90.0 to 100.0%RH ±3%RH

-30.0 to -20.0oC

-22.0 to – 4.0oF

±1.5oC

±2.7oF

-19.9 to 70.0oC

-3.9 to 158.0oF

±1oC

±1.8oF

Temperature

70.1 to 100.0oC

158.1 to 199.0oF

±1.5oC

±2.7oF

Wet Bulb 0 to 80°C (32 to 176°F)

Dew Point -30 to 100°C (-22 to 199°F)

Calculated from RH and air

temperature measurements

Display Dual LCD

Response Time: <30 seconds (90% of final value in moving air)

Operating Conditions 32 to 122oF (0 to 50oC); < 80% RH non-condensing

Storage Conditions -40 to 185oF (-40 to 85oC); <99% RH non-condensing

Power Supply 9 Volt battery

Battery Life Approx. 24 hours

Dimensions / Weight 7.8 x 1.7 x 1.3” (200 x 45 x 33mm); 7 oz. (200g)

Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform

www.extech.com

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