User's Guide Digital Psychrometer + IR
Contents
1. Backlight Press the BKLT button to turn the display backlight on The backlight will remain on until the BKLT button is pressed again or the meter is turned off Error Messages An error message will appear on the display if the meter fails an internal diagnostic test E1 Top display IR temperature failure Repair replacement is necessary E2 Top display IR temperature gt 932 F 500 C E3 Top display IR temperature lt 40 F 40 C E9 Top display Calibration error E1 E2 E3 Middle display Temperature failure Repair replacement is necessary Middle display Dew Point is out of range or Repair replacement is necessary Middle display Air temperature is out of range or Repair replacement is necessary A Or O Do E1 Bottom display RH circuit error Repair replacement is necessary 9 E5 Bottom display RH circuit error Repair replacement is necessary Setup memory The selected display emissivity value auto power off time backlight status and the laser pointer status are stored in memory and will remain in memory as the user default setting until reprogrammed by the user 5 RH401 V1 4 11 07 Calibration The following verification and calibration procedures requires a humidity chamber or the 33 and 75 RH reference bottles which are supplied with the Model RH405 kit RH Accuracy Verification Checking the 33 or 75 RH Calibration 1 Insert meter s sensor into the 33 or 75 salt reference2. Sensor meter will perform a short self test when turned on Stored Press and hold the SET button for three seconds to turn power off Press Here Humidity and Air Temperature measurements 1 Hold the meter in the area to be tested 2 Allow adequate time for readings to stabilize 3 View the Relative Humidity measurement in the lower display 4 View the Air probe Temperature measurement in the middle display Wet Bulb and Dew Point measurements APPINE Dutton until the 1 To display the Dew Point measurement press and hold the symbol DP appears in the middle display 2 Dew Point temperature is now displayed To display the Wet Bulb measurement press and hold the PPE button until the symbol Wb appears in the middle display 4 Wet Bulb temperature is now displayed 5 To display IR temp DP temp IR surface temperature Dew Point press and hold the button for more than 2 seconds then press the IR Temp button The reading can now be viewed in the top display 6 Press and hold the APPIWB button for more than 2 seconds to toggle the display back to IR temperature Non Contact InfraRed Surface Temperature measurements 1 Point the meter toward the surface to be measured 2 Press and hold the IR Temp button 3 View the temperature measurement in the upper display 4 Release the IR Temp nd the reading will be held on the display until a new reading is taken 5 While holding down the IR Temp button press the yLASER b
3. Emissivity Material under test Emissivity Asphalt 0 90 to 0 98 f Cloth black 0 98 Concrete 0 94 Skin human 0 98 Cement 0 96 Lather 0 75 to 0 80 Sand 0 90 Charcoal powder 0 96 Soil 0 92 to 0 96 Lacquer 0 80 to 0 95 Water 0 92 to 0 96 Lacquer matt 0 97 Ice 0 96 to 0 98 Rubber black 0 94 Snow 0 83 Plastic 0 85 to 0 95 Glass 0 90 to 0 95 Timber 0 90 Ceramic 0 90 to 0 94 Paper 0 70 to 0 94 Marble 0 94 Chromium Oxides 0 81 Plaster 0 80 to 0 90 Copper Oxides 0 78 Mortar 0 89 to 0 91 Iron Oxides 0 78 to 0 82 Brick 0 93 to 0 96 Textiles 0 90 Spot to Distance Ratio The 8 1 spot to distance ratio determines the size of the measured surface area with respect to the distance the meter is held away from the surface E PE pa RH401 V1 4 Selecting temperature units of measure C F Press and hold the C F button momentarily to toggle the temperature units Automatic Power OFF The meter automatically shuts off after a programmed period of time To disable auto power off with the meter off press SET and a C F When n appears release the keys and the meter is now in Non Sleep Mode The power off time is adjustable from 5 to 600 seconds To change the auto power off setting press the SET key to enter the setting procedure Use the A C F up key and the yLASER down key to set the value When the desired power off time appears in the display press the SET key again to save the parameters
4. Flow control none RS 232 Connection Connect the optional interface cable from the meter to the communications port of the PC Using Windows Terminal or HyperTerminal program for PC Communication The Terminal or the HyperTerminal program is included in all Windows operating systems Typically it is located using the following path START Menu gt Programs gt Accessories gt Communications gt Terminal or HyperTerminal When in the Terminal or HyperTerminal program configure as follows 1 Inthe Connection Description window enter a name select an icon and click OK 2 In the Connect To window select COM1 or COM2 depending on which port is being used and click OK 3 In the Port Settings window select the following data format Baud rate 9600 no parity 8 data bits 1 stop bit and no flow control Click OK to enter the main HyperTerminal window 4 In the File Menu select Properties gt Settings gt ASCII SETUP select echo typed characters and Send line ends with line feeds Click OK twice to return to the main HyperTerminal window Format Txxx xC Txx xC Hxx x TxXx xC Txx xCLRC CRLF Where The 1 value is IR Temperature the 2 value is Air Temperature the 3 value is Humidity the 4 value is Wet Bulb and the 5 value is Dew Point Format for error value E01 no value E02 Overflow E03 Underflow Unit for error code is n For example if IR is disabled TE01n T23 5C H45 3 T14 90 T12 3CLRCCRLF Ma
5. User s Guide EXT INSTRUMENTS Digital Psychrometer IR Thermometer Models RH401 and RH405 kit EXTEC H RH401 E PSYCHROMETEI AR Thermomeren amp Introduction Congratulations on your purchase of the Extech RH401 Digital Psychrometer InfraRed Thermometer This device measures Humidity Air Temperature Dew Point and Wet Bulb Advanced features include Infrared Non Contact Surface Temperature Measurement Data Hold and programmable Auto Power Off The retractable probe protects the sensors when the meter is not in use Careful use of this meter will provide years of reliable service Specifications Function Range and Resolution Accuracy Humidity 0 0 to 100 0 RH 3 RH 10 to 90 Temperature Air 4 0 to 122 0 F 20 to 50 C 1 8 F 41 C 25 C 45 C Display Sensor Type Dew Point Wet Bulb IR Emissivity IR Spot Distance Ratio IR Response Time Operating Conditions Storage Conditions Power Supply Battery Life Dimensions Weight Temperature InfraRed 3 reading or 3 C 6 F whichever is greater 4 reading or 4 C 8 F whichever is greater 4 to 842 F 20 to 450 C 40 to 4 F 842 to 932 F 40 to 20 C 450 to 500 C Triple LCD with backlight Humidity Capacitance sensor Temperature air Thermistor 90 4 to 122 0 F 68 to 50 C calculated from humidity and temperature measur
6. bottle Rotating the bottle will assist in placing it over the sensor 2 Check the reading after 10 minutes 3 Verify that the reading is within the accuracy specification 33 or 75 Cal Bottle RH Calibration 33 and 75 This two point calibration takes approximately one hour to complete 33 Calibration 1 Turn off the meter and insert the meter sensor into the 33 salt reference bottle Rotating the bottle will assist in placing it over the sensor 2 Hold down the WEASER ang a C F keys and then press the amp SET key to turn the unit on 3 32 8 reading may vary depending on temperature will flash on the display After 30 minutes the flashing will stop to indicate that the 33 calibration is complete 75 Calibration 4 Insert the meter sensor into the 75 salt reference bottle From a steady 32 8 display press the SET button to enter the 75 calibration 5 75 2 reading may vary depending on temperature will flash on the display After 30 minutes the flashing will stop to indicate that the 75 calibration is complete and the calibration data has been saved to memory 6 The screen will return to the normal display Calibration is now complete Note If the salt at the bottom of the calibration bottles appears dry the bottles should be replaced 6 RH401 V1 4 11 07 RS 232 PC Communications Interface RS 232 data format Baud rate 9600 Parity none Data bits 8 Stop bits 1
7. ements 6 9 to 122 0 F 21 6 to 50 C calculated from humidity and temperature measurements Adjustable from 0 3 to 0 99 8 1 0 5 seconds 4 to 122 F 20 to 50 C lt 99 RH non condensing 40 to 185 F 40 to 85 C lt 99 RH non condensing 4 x 1 5V AAA batteries or AC adaptor approx 150 hours laser inactive 30 hours laser active 6 8x2 7x1 9 175x70x50mm 4 9 oz 140g Meter Description 1 Emissivity adjust indicator lt 3 2 Laser pointer on indicator 3 Low Battery indicator E sonata 4 IR Surface Temperature button eS 5 ON OFF Setup nee AEE bes bt 8 11 6 Back Light button 3 El Humi 88 5 10 7 Laser Down button 8 F C Up button e15 9 Dew Point Wet Bulb button 4 9 10 Humidity display je 14 11 Air Temperature Dew Point or Wet Bulb display 5 8 12 IR Surface Temperature display 13 Extended probe with Humidity amp 6 7 Air Temperature Sensors 14 PC interface port 15 AC adaptor jack Note The battery compartment is located on the rear of the instrumen 2 RH401 V1 4 11 07 Operation Retractable Humidity and Air Temperature Sensor Press down on the sensor located at the top of the meter to release it Humidity and air temperature will not be displayed if the sensor is not extended Sec d After use press the sensor into the stored protected position Power ON OFF Press the SET or the HR Temp button to turn power on The
8. intenance 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 symbol will appear on the lower left of 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 7 RH401 V1 4 11 07 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 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 i
9. mproper 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 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 r N 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 2007 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 8 RH401 V1 4 11 07
10. utton to toggle the laser targeting pointer on off The amp symbol will appear in the middle left of the display indicating that surface temperature measurement is active and the laser pointer is on WARNING The Laser button R enables disables the Laser pointer When enabled each press of the IR Temp button turns on the Laser beam Avoid looking directly into the path of the Laser or pointing the Laser toward anyone s eyes Mirrored surfaces near a measurement object can redirect the Laser use extreme caution Do not allow the Laser beam to be directed toward explosive gases 3 RH401 V1 4 11 07 IR Emissivity Adjustment Emissivity is adjustable from 0 3 to 0 99 The default value is 0 95 which is the typical emissivity value of many non metallic surfaces If the surface to be measured is highly reflective and the emissivity is not known cover the surface with paint or tape to improve measurement accuracy If the emissivity of the surface is known follow this procedure to set the value 1 With the meter on Press the SET key twice to enter the Emissivity setting procedure E will flash on the top left side of the display 2 Use the 4 C F up key and the yLASER down key to adjust the value 3 When the desired setting appears in the display press SET again to save and return back to normal operation Emissivity Factors for Common Materials Material under test
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