Instruction Manual - Davis Instruments
Contents
1. F appears in the lower right 2 Temperature is now displayed Data Hold Press the hold button 1 momentarily to freeze the displayed readings HOLD will appear on the upper left hand side of the display Press the hold button 1 again to return to normal operation 5 RH390 V2 0 03 05 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 2 Press and hold the light button 21 until the backlight comes on To turn the backlight off press and hold the light button m4 until to backlight turns off Automatic Power OFF The meter has a default setting that automatically shuts the meter off after 10 minu2. S CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment a six month limited warranty applies to sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization or visit our website www extech com for contact information A Return Authorization RA number must be issued before any product is returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages Extech s total liability is limited to repair or replacement of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or implied 2 RH390 V2 0 03 05 Meter Description Humidity amp Temperature Sensor LCD Display Power ON OFF button F C WBT wet bulb Dew Point button MIN MAX button HOLD Backlight button oa F oOo DP Note The battery com
3. User s Guide EXT INSTRUMENTS Digital Psychrometer Model RH390 _ Precision Psychrometer Humidity Temperature Wet Bulb Dew Point 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 Specifications Function Range and Resolution Accuracy 2 RH 20 to 90 Humidity 0 0 to 100 0 RH 3 RH 10 to 20 and 90 to 95 4 RH typical at 1 and 99 4 0 to 158 0 F Temperature 20 to 70 C 1 8 F 41 C 22 0 to 3 9 F g a a fate and 70 1 to 100 0 C Display Dual LCD Response Time lt 30 seconds 90 of final value in moving air Sensor Type Humidity Precision capacitance sensor Temperature Thermistor Wet Bulb 32 to 176 F 0 to 80 C calculated from RH and Air temperature measurements Dew Point 22 to 199 F 30 to 100 C calculated from RH and Air temperature measurements Operating Conditions 32 to 122 F 0 to 50 C lt 80 RH non condensing Storage Conditions 40 to 185 F 40 to 85 C lt 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 Warranty EXTECH INSTRUMENT
4. om Repair amp Returns Extension 210 E mail repair extech com Product specifications subject to change without notice For the latest version of this User s Guide Software updates and other up to the minute product information visit our website www extech com Copyright 2005 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 7 RH390 V2 0 03 05
5. partment is located on the rear of the instrument A ADL Precision Psychrometer Humidity Temperature Wet Bulb Dew Point ce Display Description 1 Relative Humidity 6 7 2 Dew Point 3 Wet Bulb 9 RH A 4 C F 5 Temp WB DP Display C fi 6 Maximum 10 7 Minimum Uf TE dh an 8 Low Battery F 9 Hold 8 H IE a f 10 RH Display 1 l povai 3 11 Auto Off 3 RH390 V2 0 03 05 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 4 RH390 V2 0 03 05 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
6. tes indicated by the 5 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 H 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 Q 6 RH390 V2 0 03 05 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 Calibration and Repair Services Extech offers repair and calibration services for the products we sell Extech also provides NIST certification for most products Call the Customer Service Department for information on calibration services available for this product Extech recommends that annual calibrations be performed to verify meter performance and accuracy Seat pay Support line 781 890 7440 Technical support Extension 200 E mail support extech c
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