User's Guide Digital Psychrometer + IR Thermometer Models RH401 and RH405 (kit) DP Wb Humi C % 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, and an RS-232 interface for capturing readings to a PC using optional 407752 software. The retractable probe protects the sensors when the meter is not in use. Careful use of this meter will provide years of reliable service. Meter Description 1. Emissivity adjust indicator 2. Laser pointer on indicator 3. Low Battery indicator 4. IR Surface Temperature button 5. ON/OFF/Setup button 6. Back Light button 7. Laser/Down button 8. °F/°C/Up button 9. Dew Point/Wet Bulb button 13 1 2 3 DP Wb Humi % 12 11 10 4 15 9 14 5 8 6 7 10. % Humidity display 11. Air Temperature, Dew Point or Wet Bulb display C 12. IR Surface Temperature display 13. Extended probe with Humidity & Air Temperature Sensors 14. PC interface port 15. AC adaptor jack Note: The battery compartment is located on the rear of the instrument 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 Department 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. 2 RH401 V1.5 8/08 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. After use, press the sensor into the stored (protected) position. Press Here Sensor Extended Power ON/OFF (or the button) to turn power on. The Press the meter will perform a short self-test when turned on. button for three seconds to turn power off. Press and hold the Sensor Stored 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 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. button until the button until the 3. To display the Wet Bulb measurement, press and hold 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 to IR temperature. button for more than 2 seconds to toggle the display back Non-Contact InfraRed Surface Temperature measurements 1. Point the meter toward the surface to be measured. button. 2. Press and hold the 3. View the temperature measurement in the upper display 4. Release the nd the reading will be held on the display until a new reading is taken. button, press the button to toggle the laser 5. While holding down the targeting pointer on/off. The 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 enables/disables the Laser pointer. When button turns on the Laser beam. Avoid looking directly enabled, each press of the 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 V1.5 8/08 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. key twice to enter the Emissivity setting procedure. 1. With the meter on, Press the will flash on the top left side of the display. 2. Use the up key and the down key to adjust the value. 3. When the desired setting appears in the display, press again to save and return back to normal operation. Emissivity Factors for Common Materials Material under test Emissivity Material under test Emissivity Asphalt 0.90 to 0.98 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. 4 RH401 V1.5 8/08 Selecting temperature units of measure (C/F) o o 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. and . When “n” appears, To disable auto power off, with the meter off, press 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 key to enter the setting procedure. Use the up key and the setting, press the down key to set the value. When the desired power-off time appears in the display, key again to save the parameters. press the 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. 1. E1 (Top display): IR temperature failure. Repair/replacement is necessary. 2. E2 (Top display): IR temperature >932°F (500°C). 3. E3 (Top display): IR temperature <-40°F (-40°C). 4. E9 (Top display): Calibration error. 5. E1 (Middle display): Temperature failure. Repair/replacement is necessary. 6. E2 (Middle display): Dew Point is out of range or Repair/replacement is necessary. 7. E3 (Middle display): Air temperature is out of range or Repair/replacement is necessary. 8. 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 V1.5 8/08 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 reference 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. and Hold down the key to turn the unit on. keys and then press the 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” button to enter the 75% calibration. display press the 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 V1.5 8/08 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 TM acquisition kit. The kit includes Windows compatible software that allows the user 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. 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 (±1 C) o o o Temperature (InfraRed) (@25ºC ±5ºC) o o -40 to -4 F, 842 to 932 F o o o o o ±3% reading or ±3 C/6 F whichever is greater o -4 to 842 F (-20 to 450 C) o o o -40 to -20 C, 450 to 500 C ±4% reading or ±4 C/8 F whichever is greater Display Triple LCD with backlight Sensor Type Humidity: Capacitance sensor; Temperature (air): Thermistor Dew Point -90.4 to 122.0 F (-68 to 50 C) (calculated from humidity and temperature measurements) Wet Bulb -6.9 to 122.0 F (-21.6 to 50 C) (calculated from humidity and temperature measurements) IR Emissivity Adjustable from 0.3 to 0.99 IR Spot/Distance Ratio 8:1 IR Response Time 0.5 seconds Operating Conditions -4 to 122 F (-20 to 50 C); < 99% RH non-condensing o o o o o o o o Storage Conditions -40 to 185 F (-40 to 85 C); <99% RH non-condensing Power Supply 4 x 1.5V ‘AAA’ batteries or AC adaptor Battery Life approx. 150 hours (laser inactive); 30 hours (laser active) Dimensions / Weight 6.8x2.7x1.9” (175x70x50mm); 4.9 oz. (140g) 7 RH401 V1.5 8/08 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 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. 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. Support line (781) 890-7440 Technical support: Extension 200; E-mail: [email protected] Repair & Returns: Extension 210; E-mail: [email protected] Product specifications subject to change without notice For the latest version of this User’s Guide, Software updates, and other up-to-theminute product information, visit our website: www.extech.com Copyright © 2008 Extech Instruments Corporation (a FLIR company) All rights reserved including the right of reproduction in whole or in part in any form. 8 RH401 V1.5 8/08