Extech RH350 Dual Input Hygro-Thermometer
Contents
1. change the settings After the Minute setting is complete press the T2 A WB button to confirm the date time setting and return to normal operation Data Hold Press the RECHOLD button momentarily to freeze the displayed reading The HLD icon will appear on the upper right hand side of the display Press the RECHoLp button again to return to normal operation Minimum MN Maximum MX Average AVG Function The MIN MAX Average mode allows the user to view only the lowest MN highest MX or average readings Press the M AVrstT button once and MN appears on the display The display is now showing the lowest humidity and temperature readings in memory Press the M AVRsT button again and MX appears on the display The display is now showing the maximum humidity and temperature readings in memory Press the M AVrsT button again to display the average AVG readings in memory To exit the MIN MAX AVG mode press the M AVrRsT button To clear the current min max avg readings in memory press and hold the M AVRsT button for more than two seconds 3 RH350 355 V2 1 8 08 Backlight Display Press the M AVnsT and MEM buttons together to turn on the backlight It will remain on for ten seconds Automatic Power OFF With the meter off press and hold down the ON OFFskT RECHoLD buttons for more than 1 second to enter auto power off settings Press the MEM button to select non sleep n or 2 5 10 20 40 and 602. User s Guide EXTECH L INSTRUMENTS A FLIR COMPANY SuperHeat Psychrometer Models RH350 and RH355 kit a ap Qus c 1 EXTECH Ua Introduction Congratulations on your purchase of the Extech RH350 SuperHeat Psychrometer This device measures Differential Temperature T1 T2 Air T1 T1 DP Humidity Air Temperature Dew Point and Wet Bulb Advanced features include built in memory and recall of up to 99 data points Min MAX Average readings from the captured data Data Hold selectable Auto Power Off and an RS 232 interface for capturing readings to a PC using optional 407752 software Careful use of this meter will provide years of reliable service Meter Description 1 Humidity Sensor amp Air Temperature Sensor Triple LCD Display On Off Set Mode Min Max Average Reset Min Max Air T1 Air T1 Dew Point T1 probe input T2 probe input T1 T2 T2 T1 Dew Point Wet Bulb 9 Store Current Reading Backlight 10 Hold Recall Mode 11 RS232 port ONOaP wh Note The battery compartment is located on the rear of the instrument Display Description Air T1 Air T1 Dew Point Low Battery Temperature C F T2 T1 T2 T1 Dew Point Wet Bulb Temperature C F Date month day year Time 24 hour clock Memory Store Recall Location Relative Humidity Maximum Minimum Hold Average o 0o o Ot doo m oL 2 RH350 355 V2 1 8 08 Operation CLOSE OPEN Open the Protecti
3. artment 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 4 RH350 355 V2 1 8 08 CALIBRATION The following verification and calibration procedures require the 33 and 75 RH reference bottles which are supplied with the Model RH355 kit Accuracy Verification Checking the 33 or 75 RH Calibration 1 Insert meter s sensor into the 33 or 75 salt reference bottle 2 Check the reading after a minimum of 10 minutes 3 Verify that the reading is within the accuracy specification Relative Humidity Calibration 33 and 75 33 Calibration 1 Turn the meter Off 2 Insert the meter sensor into the 33
4. h 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 symbol will appear on the LCD Replace the four 4 1 5 AAA batteries by removing the rear battery compartment cover and accessing the battery compartment Observe polarity when placing the batteries in the compartment Ensure that the compartment cover is securely fastened when finished s Support line 781 890 7440 Technical support Extension 200 E mail support extech com 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 O 2008 Extech Instruments Corporation a FLIR company All rights reserved including the right of reproduction in whole or in part in any form 6 RH350 355 V2 1 8 08
5. minutes autosleep Press T2 A WB to confirm the selection Manual Datalogging Manual datalogging allows the user to store and recall up to 99 readings with the press of a button 1 Press the MEM button to manually store a single reading into memory The display will flash 3 times and the memory location number will be displayed below the humidity reading 2 To view stored readings press and hold the RECHOoLD button for 2 seconds and RECALL will blink next to the memory location number on the display 3 Press the MEM button to manually increment through the stored readings Press RECHoLD MEM for more than 1 second to clear the memory 5 Press RECHoLp for more than 1 second to return to normal operation gt A Note In RECALL mode pressing the M AVRsT button for min max avg readings will auto search the stored readings in memory and display the minimum maximum and average values of the stored readings Note An infrared printer port is located on the side of the meter This feature is used on more advanced models and is not functional on this model Warranty EXTECH INSTRUMENTS CORPORATION A FLIR COMPANY 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 Dep
6. salt reference bottle 3 Allow the meter one hour to stabilize 4 While holding down the M AVnsT button press and hold the ON OFFskT button for 2 seconds to enter calibration mode 5 32 8 reading may vary depending on operating temperature will flash on the LCD screen After 30 minutes the flashing will stop to indicate that the 3396 calibration is complete Note To exit from the calibration procedure before completion pressing the ON OFFskr button will turn the meter off 6 Proceed to the 75 Calibration below 75 Calibration 1 Insert the meter sensor into the 75 salt reference bottle 2 Allow the meter one hour to stabilize 3 Press and hold the M AVnsT button for 2 seconds to enter the 75 calibration 4 75 3 reading may vary depending on operating temperature will flash on the LCD After 30 minutes the flashing will stop to indicate that the 75 calibration is complete 5 Turn power off Calibration is now complete Note Frequently check the water level in the salt bottles Both the 33 and 75 bottles should be completely saturated with some water present The bottles are sealed and not refillable RS 232 PC Communications Interface The meter is equipped with an RS 232 PC interface jack 3 5mm phono for connection to a PC The cable to connect the meter to the PC is included in the optional 407752 data acquisition kit The kit includes Windows compatible software that allows the user
7. to store readings in a text file and display real time measurements in a series of selectable formats For more information or specific operating instructions refer to the User Guide included with the 407752 kit or contact Extech Instruments 5 RH350 355 V2 1 8 08 Specifications Function Range and Resolution Accuracy T 3 RH 10 to 90 o Humidity 0 0 to 100 0 RH Q 23 C Temperature air 4 0 to 122 0 F 20 to 50 C 1 8 F 1 C Temperature external K 40 to 1832 F 40 to 1000 C 0 3 rdg 1 8 F 1 C Display Sensor Type Response Time Dew Point Wet Bulb Low Battery Indicator Overrange Indicator Underrange Indicator Operating Conditions Storage Conditions Power Supply Battery Life Dimensions Weight Maintenance Cleaning and storage Triple LCD Humidity Precision capacitance sensor Internal Temperature Thermistor External Temperature K Type Thermocouple 60 seconds typical 90 4 to 122 0 F 68 to 50 C calculated from RH and Air temperature measurements 6 88 to 122 0 F 21 6 to 50 C calculated from RH and Air temperature measurements Yes E2 air E5 T1 E8 T2 E3 air E6 T1 E9 T2 4 to 122 F 20 to 50 C 99 RH non condensing 40 to 185 F 40 to 85 C lt 99 RH non condensing 4x 1 5V AAA batteries Approx 300 hours 9 x 2 2 x 1 7 230 x 57 x 44mm 5 3 oz 153g 1 The meter should be cleaned wit
8. ve Sensor Cap Twist the protective sensor cap located at the top of the meter counter clockwise a quarter of a turn to expose the sensors Turn Power ON or OFF Press the ON OFF button to turn power on or off The meter will perform a short self test when turned on yh 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 right display along with the date and time 4 Air Temperature appears in the top left display Wet Bulb is in the lower left display 6 Pressing the T1T DPsEL button toggles the top left display between Air temperature T1 temperature Air T1 and DP Dew Point 7 Pressing the T2A WB button toggles the lower left display between WB Wet Bulb T1 T2 T2 and T1 DP Dew Point e Selecting temperature units of measure C F When the meter is off press and hold the ON OFFskT button for more than one second to enter setup mode Momentarily press the T1T DPsEL button until unit appears in the display Press the MEM button to toggle between C or F Press the T2A WB button to confirm the setting and return to normal operation Setting the Date Time 24 hour clock When the meter is off press and hold the ON OFFskT button for more than one second to enter setup mode Press the T1T DPsEL button to select Year Month Day Hour and Minute in sequence Press the MEM button to
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