Extech RH490 Hygro-Thermometer Manual PDF
Contents
1. Humidity 0 0 to 10 0 RH 3 RH 10 0 to 90 0 RH 2 RH 90 0 to 100 0 RH 3 RH Temperature 22 0 to 3 9 F 2 7 F 30 0 to 19 9 C 1 5 C 20 0 to 70 0 C 1 C 4 0 to 158 0 F 1 8 F 70 1 to 100 0 C 1 5 C 158 1 to 199 0 F 2 7 F 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 a __ Oto 1120 GPP grains per pound temperature measurements Mixing Ratio 0 to 160 g kg grams per kilogram Display Dual LCD Response Time lt 30 seconds 90 of final value in moving air Operating Conditions 0 to 50 C 32 to 122 F lt 80 RH non condensing Storage Conditions 40 to 85 C 40 to 185 F lt 99 RH non condensing Power Supply 9 Volt battery Battery Life Approx 24 hours Dimensions Weight 200 x 45 x 33mm 7 8 x 1 7 x 1 3 200g 7 oz Copyright 2009 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 6 RH490 EU V2 0 12 062. User s Guide EXT INSTRUMENTS A FLIR COMPANY Precision Hygro Thermometer Model RH490 HIT CE Introduction Congratulations on your purchase of the Extech RH490 Precision Hygro Thermometer This device measures Humidity Air Temperature Dew Point temperature Wet Bulb temperature and Grains of Water Vapor Per Pound of Air Advanced features include Data Hold Auto Power Off and MAX MIN reading This meter is shipped fully tested and calibrated and with proper use will provide years of reliable service Meter Description 1 2 ONDAY Note The battery compartment is located on the rear of the instrument Copyright 2006 Extech Instruments Corporation Reservados todos los derechos incluyendo el derecho de reproducci n total o parcial en cualquier medio Humidity amp Temperature Sensor LCD Display Power ON OFF button F C WBT wet bulb Dew Point button Hold MIN MAX button RH GPP g Kg Backlight button Display Description A A DWN CON OV ON Relative Humidity Dew Point Wet Bulb C F Temp WB DP Display Maximum Minimum Low Battery Hold RH Display Auto Off Grains per pound 12 1 6 7 9 RH490 EU V2 0 12 06 Operation Power Press the power button to turn power on or off RH 1 To select RH measurement press the RH GPP g Kg button 2 Hold t
3. e H MAX MIN button momentarily to freeze the displayed readings HOLD will appear on the upper left hand side of the display 2 Press the H MAX MIN button three more times to return to normal operation Steps through MAX and MIN RH490 EU V2 0 12 06 Minimum MIN Maximum MAX Function The MIN MAX mode allows the user to view only the lowest MIN or highest MAX readings 1 Press the H MAX MIN button twice and MIN appears on the display The LCD is now displaying the minimum value recorded in both the top and bottom display The display will not change until a lower reading is registered 2 Press the H MAX MIN button again and MAX WRH MAX appears on the display The LCD is now displaying ed the maximum value recorded in both the top and na bottom display The display will not change until a wTrfr higher reading is registered MLI 3 To exit the MIN MAX mode press the H MAX F MIN button again The MAX icon will disappear P Aes Note Max and Min values are recorded into memory while the meter is on The values are erased when power is turned off Backlight Press and hold the light button E 4 until the backlight turns on To turn the backlight off press and hold the light button E g 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 j symbol on the display Th
4. he probe in the area to be tested 3 Allow adequate time for readings to stabilize 4 The Relative Humidity measurement appears in the top display 5 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 Mixing Ratio Grains Per Pound or Grams Per Kilograms 1 To select GPP or g kg measurement press the RH GPP g Kg button 2 Hold the probe in the area to be tested 3 Allow adequate time for readings to stabilize 4 The GPP or g Kg measurement appears in the top display 5 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 3 RH490 EU V2 0 12 06 Dew Point 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 Wet Bulb 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 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 1 Press th
5. is battery saving feature can be disabled To disable the auto power off function press and hold the H MAX MIN 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 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 becomes weak the H 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 E device at the end of its lifecycle 5 RH490 EU V2 0 12 06 Specifications Function Range and Resolution Accuracy
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