Extech Instruments EA20 User's Manual
Contents
1. Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 5 EA20 V15 03 042. minute to 59 minutes in 7 selectable times Approx 200 hours 5 9 x 2 8 x 1 4 150 x 72 x 35mm 8 3 oz 235g Meter Description 1 Humidity Temperature Probe ry MN 2 Multifunction LCD with bargraph lt and status indicators U 3 Power ON OFF button 4 MX MN button 5 DATAHOLD button E mini 6 Humidity Temperature select k sila Aa button MOBAB 7 TIME button for MX MN elapsed BBE timer 8 Temperature units C F selet ww 3 button re 9 DEW POINT temperature select te o button SS 10 RELATIVE mode button Ll ae Frees 11 WET BULB temperature select es button eet 12 MEM key manual datalogging control key 13 READ key manual memory data reading control key 14 a v keys to select memory location Note The battery compartment is located on the rear of the instrument 2 EA20 V15 03 04 Operation NOTE Do not immerse the probe in liquid it is intended for use in air only Turn Power ON or OFF Press the button to turn power on or off The meter will perform a short self test when turned on Taking measurements 1 Hold the probe in the area to be tested 2 Allow adequate time for readings to stabilize 3 Read the humidity and temperature on the LCD The RH TEMP button allows the user to choose whether the temperature or the humidity is displayed on the larger digits Press the RH TEMP button to toggle the display configuration Selecting temperatu
3. Service Department at 781 890 7440 EXTENSION 210 for authorization or visit www extech com for more 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 Calibration and Repair Services Extech offers complete repair and calibration services for all of the products we sell or periodic calibration NIST certification or repair of any Extech product call customer service for details on services available Extech recommends that calibration be performed on an annual basis to ensure calibration integrity Support Hotline 781 890 7440 Tech support Ext 200 Email support extech com Repair Returns Ext 210 Email repair extech com Website www extech com Copyright 2004 Extech
4. User s Guide EXT INSTRUMENTS EasyView Digital Hygro Thermometer and Datalogger Model EA20 Temperature Meter OAD yy MX MN yeas in vi Mj BB85 IRC TEMP Cow 2 MEM READ Introduction Congratulations on your purchase of the Extech EasyView EA20 Digital Hygro Thermometer This device measures Humidity Temperature Dew Point temperature and Wet Bulb temperature Advanced features include Manual Datalogging of up to 99 sets MAX MIN recording Relative measurement mode and elapsed timer Careful use of this meter will provide years of reliable service Specifications Function Range and Resolution Accuracy Humidity 10 0 to 95 0 RH 3 RH at 25 C 30 to 95 RH 5 RH at 25 C 10 to 30 RH Temperature 4 to 140 F 20 to 60 C 0 9 F 0 5 C Display Multifunction LCD with bargraph and status indicators Sensor Type Humidity Precision capacitance sensor Response Time Sampling Rate Datalogging Memory Operating Conditions Storage Conditions Power Supply Battery Life Dimensions Weight Temperature Thermistor Humidity 45 to 95 lt 1 min 95 to 45 lt 3 min Temperature Approx 2 seconds for a 10 C change 2 times per second 99 sets 32 to 140 F 0 to 60 C lt 95 RH non condensing 14 to 140 F 10 to 60 C lt 70 RH non condensing 6 x 1 5V AAA batteries with programmable auto power off 1
5. ll the display will show FULL Data Recall 1 Press the READ key to enter the READ mode The LCD will show an R and the memory address number 2 Press the w keys to scroll through the memory locations 3 Press DEW or WET to view the stored Dew Point or Wet Bulb temperature 4 Press the READ key to exit this mode Relative mode Measurements can be displayed as a difference between actual humidity temperature and stored reference values To store a humidity temperature reading group as a reference press the REL button when the desired reference readings are on the LCD the triangle icon will appear steady in the upper left hand corner of the LCD All subsequent displayed readings will be relative to the stored reference value For example if the reference values are 50 0 amp 100 F and the actual readings are 53 0 amp 105 F the meter will display 3 0 amp 5 F To exit the Relative mode press and hold the REL button until the triangle icon disappears Automatic Power OFF The meter automatically shuts off after a programmed period of time To program the time period press and hold the TIME button while turning the meter on Release the TIME button after the meter finishes its self test Press the TIME button to scroll through the eight time selections shown on the smaller digits at the center of the LCD Select from the following list 0 disabled 1 3 5 10 15 30 or 59
6. minutes Press the H button to store the desired time 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 BT symbol will appear on the LCD Replace the six 6 1 5 AAA batteries by removing the rear center battery compartment screw and accessing the battery compartment Observe polarity when placing the batteries in the compartment Ensure that the compartment cover is securely fastened when finished 4 EA20 V15 03 04 Calibration and Repair Services Extech offers complete repair and calibration services for all of the products we sell For periodic calibration NIST certification or repair of this Extech product call customer service for details on services available Extech recommends that calibration be performed on an annual basis to ensure calibration integrity Warranty EXTECH INSTRUMENTS CORPORATION warrants the basic instrument to be free of defects in parts and workmanship for one year from date of shipment a six month limited warranty applies on sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer
7. o return to normal operation the H hold icon will disappear DEW POINT temperature display Dew Point temperature is calculated by the meter based on humidity temperature measurements To view the Dew Point temperature press the DEW button momentarily The DEW display icon will appear on the right side of the LCD The Dew Point temperature will display on the bottom larger digits The upper smaller digits will display the regular temperature in C or F or the humidity in RH use the RH TEMP button to toggle between the two WET BULB temperature display Wet Bulb temperature is calculated by the meter based on humidity temperature measurements To view the Wet Bulb temperature press the WET button momentarily The WET display icon will appear on the right side of the LCD The Wet Bulb temperature is displayed on the bottom larger digits The upper smaller digits will display the regular temperature in C or F or the humidity in RH use the RH TEMP button to toggle between the two 3 EA20 V15 03 04 Manual Datalogging Clearing The Memory 1 Press the button to power off the meter 2 Press and hold down the MEM key then press the key to power on the meter The display will show CLr indicating that the memory has been erased Entering A Reading 1 Press the MEM key to enter a reading The display will momentarily show an M and the memory location number from 1 to 99 2 When the memory is fu
8. re units of measure C F Press the C F button momentarily to toggle the temperature units Maximum MX and Minimum MN recording NOTE The Automatic Power OFF feature will be disabled while the MX MN mode is selected The MX MN mode allows the user to view only the highest MX or lowest MN readings Press the MX MN button momentarily to start the elapsed timer and begin recording The display will now only show the highest reading the MX icon will appear Press the MX MN button again to view the lowest reading MN will display The TIME button allows the user to view the elapsed time for a particular Max or Min reading in Minutes Seconds 59mins 59secs max or Days Hours 99days 24hours max To check the highest or lowest Dew Point or Wet Bulb temperatures use the DEW and the WET buttons The following data displays are available in the MX MN mode a Maximum and Minimum humidity with its associated temperature reading b Maximum and Minimum temperature with its associated humidity reading c Maximum and Minimum Dew point temperature with its associated standard temperature or humidity d Maximum and Minimum Wet Bulb temperature with associated standard temperature or humidity To exit the MX MN mode press and hold the MX MN button until the MX and MN icons disappear Data Hold Press the H button momentarily to freeze the displayed reading The H icon will appear on the upper left hand side of the display Press the H button again t
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