Digital Psychrometer Models RH300 and RH305 (kit)
Contents
1. EXTECH i USER GUIDE INSTRUMENTS Digital Psychrometer Models RH300 and RH305 kit SUMS ameter ciHLD g og THAN HOOD EXTRGH RH3 Introduction Congratulations on your purchase of the Extech RH300 Digital Psychrometer This device measures Humidity Air Temperature Dew Point temperature and Wet Bulb temperature Advanced features include External Temperature Measurement with optional probe Data Hold selectable Auto Power Off and MAX MIN Average reading Careful use of this meter will provide years of reliable service Meter Description Humidity Sensor amp Air Temperature Sensor Triple LCD Display ON OFF button T1 T2 Dew Point T1 button F C select MIN MAX RESET button T2 DP Wet Bulb T2 button HOLD button T2 Probe Jack SO ON o OV B ON oS Sabie HOOD Digital Psychrometer Note The battery compartment is located 2 on the rear of the instrument 2 RH300 EU EN v1 6 9 13 Display Description Relative Humidity T1 T1 T2 Dew Point Wet Bulb T2 Dew Point C F T2 Maximum Minimum Low Battery Hold 2B EG ONnNoahon gt O Operation Open the Protective Sensor Cap SE OPEN se gt Twist the protective sensor cap located at the top of the meter counter clockwise a quarter of a turn to expose the sensor Plug in the optional external temperature probe if needed Turn Power ON or OFF Press the ON OFF button to turn power on2. Battery Life Approx 80 hours Dimensions Weight 178 5 x 48 8 x 25 2mm 7 x 1 9 x 1 140g 4 9 oz Copyright 2013 FLIR Systems Inc All rights reserved including the right of reproduction in whole or in part in any form www extech com 7 RH300 EU EN v1 6 9 13
3. 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 wr 3 The Relative Humidity measurement appears in I the top display 2 Hw 4 Pressing the ATIDP button toggles the lower left aH display between T1 T2 internal temperature external temperature DP Dew Point and T1 Ti P t internal pert aes 5 Pressing the WB button toggles the lower right display between T2 DP external temperature Dew Point WB Wet Bulb and T2 external temperature Note If the external probe is not connected T1 T2 T2 DP and T2 measurements will not be displayed Selecting temperature units of measure C F Press and hold the C F button momentarily to toggle the temperature units 3 RH300 EU EN v1 6 9 13 Wet Bulb and Dew Point measurements 1 To read the Wet Bulb measurement press the WB button until the symbol Wb appears in the lower right display Note T2 will not be displayed unless the external probe is connected 2 Wet Bulb temperature is now displayed 3 To read the Dew Point measurement press the ATIDP button until the symbol DP appears in the lower left display 4 Dew Point temperature is now displayed Minimum MIN Maximum MAX Function The MIN MAX mode allows the user to view only the lowest MIN or highest MAX readings Press the Sw button once and MIN appears on
4. the meter to remain for one hour in the 75 salt bottle to stabilize Important Do NOT power the meter OFF while in the Calibration mode Note that AUTO POWER OFF is disabled while in the Calibration mode After one hour press and hold the MN MX button until 75 3 begins flashing on the meter display The meter has now entered the 75 0 calibration stage After 30 minutes have elapsed the meter will automatically exit the calibration mode and return to the normal operating mode The Calibration is complete turn power OFF Note To exit from the calibration procedure before completion press the ON OFF button Note If the salt at the bottom of the calibration bottles appears dry the bottles should be replaced 5 RH300 EU EN v1 6 9 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 dg symbol will appear on the LCD Replace the two 2 1 5 AAA batteries by removing the rear battery compartment cover and accessing the battery compartment Observe correct polarity when placing the batteries in the compartment Ensure that the compartment cover is securely fastened when finished EU Directive Never d
5. E r ER4 Internal temperature is out of range ER5 External temperature is out of range O E ON gt 4 RH300 EU EN v1 6 9 13 Calibration The following verification and calibration procedures require the 33 and 75 RH reference bottles which are supplied with the Model RH305 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 10 minutes 3 Verify that the reading is within the accuracy specification Relative Humidity Calibration 33 and 75 Calibration Preparation e Ensure that fresh batteries are installed in the meter e Move the protective vent cap to the Open position e Power the meter ON and set it to display dew point DP and wet bulb Wb in the lower display area Calibration Procedure 1 2 3 4 5 9 10 11 Follow the Preparation steps above before continuing Power the meter OFF Insert the meter into a 33 salt bottle Leave the meter OFF for one hour to stabilize After the meter has stabilized for one hour e Press and hold the C F button while powering the unit ON e The unit enters calibration mode 32 8 flashes on the display e The DP and Wb display areas show DP Wb C Once the 33 calibration is complete the display stops flashing and a constant 32 8 is displayed Allow the meter to remain ON and move it to the 75 salt bottle Allow
6. ispose of used batteries or rechargeable batteries in household waste As consumers users are legally required to take used batteries to appropriate collection sites the retail store where the batteries were purchased or wherever m batteries are sold Disposal Do not dispose of this instrument in household waste The user is obligated to take end of life devices to a designated collection point for the disposal of electrical and electronic eguipment Other Battery Safety Reminders o Never dispose of batteries in a fire Batteries may explode or leak o Never mix battery types Always install new batteries of the same type 6 RH300 EU EN v1 6 9 13 Specifications Range and Resolution Accuracy Humidity 0 0 to 100 0 RH 3 RH 10 to 90 23 C Temperature internal 20 to 50 C 4 0 to 122 0 F 217C 1 8 F Temperature external 20 to 70 C 4 0 to 158 0 F 217C 1 8 F Display Triple LCD Sensor Type Humidity Precision capacitance sensor Temperature Thermistor Response Time 60 seconds typical Dew Point 90 4 to 122 0 F 68 to 50 C calculated from RH and Air temperature measurements Wet Bulb 6 88 to 122 0 F 21 6 to 50 C calculated from RH and Air temperature measurements Operating Conditions 20 to 50 C 4 to 122 F lt 99 RH non condensing Storage Conditions 40 to 85 C 40 to 185 F lt 99 RH non condensing Power Supply 2 x 1 5V AAA batteries
7. the display The display is now showing the lowest humidity and temperature reading in memory Press the mxmw button again and MAX appears on the display The display is now showing the maximum humidity and temperature readings in memory To exit the MIN MAX mode press the town button again and the MIN and MAX icons disappear To clear the current min max readings in memory press and hold the Mxmw button for more than two seconds Data Hold Press the HOLD button momentarily to freeze the displayed reading The HLD icon will appear on the upper right hand side of the display Press the HOLD button again to return to normal operation Automatic Power OFF The meter automatically shuts off after a programmed period of time The default time is 10 minutes To program the time period press down the HOLD button while turning the meter on Continue to hold down both buttons and the meter will cycle through the selectable power off times n 2 5 10 20 40 or 60 minutes n disables the auto power off function When the desired power off time appears in the display release both buttons to select the time and return to normal operation Error Messages An error message will appear on the display if the meter fails an internal diagnostic test ER1 Relative Humidity failure Repair replacement is necessary ER2 Internal temperature failure Repair replacement necessary ER3 Reference resistance failure Repair replacement necessary
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