User's Guide Hygro-Thermometer + InfraRed Thermometer Model RH101 Patented Introduction Congratulations on your purchase of the Extech Hygro-Thermometer plus InfraRed Thermometer. This device measures relative humidity, air temperature (with probe), and surface temperature (with the InfraRed function). The large, easy-to-read backlit LCD includes primary and secondary displays plus numerous status indicators. The InfraRed feature includes a laser pointer for convenient targeting. Careful use of this meter will provide years of reliable service. Specifications Function Range and Resolution Accuracy Humidity 10.0 to 95.0% RH ± 3.5% RH o o o Air Temperature -4 to 140 F (-20 to 60 C) IR Temperature o -58.0 to -4.0 F (-50.0 to -20.0 C) o o o ± 9 F (± 5 C) o -4.0 to 199.9 F (-20.0 to 93.3 C) o o ± 3.0 F (± 2.0 C) o o o 200 to 400 F (93 C to 204 C) o o o 400 to 932 F (204 C to 500 C) o o ± 2% of rdg or ± 4 F (± 2 C) ± 3% of rdg Display Dual LCD with Backlight and status indicators Sensor Type Humidity: Precision capacitance sensor Temperature: Thermistor (probe) and InfraRed Response Time IR Temperature: 0.5 seconds; Probe Temperature and Relative Humidity: 3 minutes Accuracy note Accuracy is specified for the following ambient temperature range: 64 to 82°F (18 to 28°C) Sampling Rate 2.5 samples per second InfraRed Emissivity 0.95 (fixed) IR Field of View D/S = Approx. 8:1 ratio (D = distance, S = spot) Laser power Less than 1mW IR Spectral Response 6 to 14 μm (wavelength) Operating Conditions 32 to 122 F (0 to 50 C); < 80% RH non-condensing o o o o Storage Conditions 14 to 140 F (-10 to 60 C); <80% RH non-condensing Power Supply 9V Battery with auto power off (after 10 minutes) Battery Life Approx. 24 hours (if Backlight and Laser are used continuously the battery life is reduced to 2 to 3 hours approx.) Dimensions / Weight 5.9 x 2.8 x 1.4” (150 x 72 x 35mm); 8.3 oz. (235g) Patent Notice U.S. Patent 7168316 Safety • Use extreme caution when the laser pointer beam is on • Do not point the beam toward anyone's eye or allow the beam to strike the eye from a reflective surface • Do not use the laser near explosive gases or in other potentially explosive areas 2 RH101 V2.1 8/07 Meter Description 1. Humidity/Air Temperature Probe 2. Probe input jack 3. Laser pointer 4. IR Sensor 5. Rubber holster 6. LCD Display 7. IR thermometer measurement button 8. IR and Relative Humidity function buttons (4) 9. Air Temperature function buttons (3) 10. Probe holder 11. Power ON/OFF button 12. Backlight button Note: The battery compartment, tilt stand, tripod mount, and probe holder removal screw are located on the rear of the instrument Display Layout • MAX (top of LCD): Max Hold function engaged for the Air Temperature function • HOLD (top of LCD): Data Hold function engaged for the Air Temperature function • PROBE TEMP: Reminder that the top LCD digits represent Air (Probe) Temperature • : Indicates that the laser pointer is on. • IR TEMP: Indicates that the larger LCD digits represent IR temperature measurement • MAX (bottom of LCD): Max Hold for the IR Temperature and RH function • HOLD (bottom of LCD): Data Hold for the IR Temperature function and RH function • o • %RH: Relative Humidity unit of measure • Large LCD digits at center of display for Relative Humidity and IR Temperature • Smaller LCD digits at top, right of display for Probe Temperature • o C / F: Temperature units of measure : Low battery indicator 3 RH101 V2.1 8/07 Operation Power Press the button to turn power on or off. Probe Humidity and Temperature Measurements 1. Attach the probe to the meter via the jack at the top of the meter. 2. Hold the probe in the area to be tested & allow adequate time for readings to stabilize. 3. Read the Relative Humidity (center of LCD) and Probe Temperature (top of LCD). NOTE: Do not immerse the probe in liquid; it is intended for use in air only. InfraRed (Non-Contact) Temperature Measurements 1. The IR sensor is located at the top of the meter. 2. Point the sensor toward the surface to be measured. 3. Press and hold the large red IR button to begin measuring the surface temperature of a desired target. IR TEMP and will appear on the display. The laser pointer will switch on to help aim the meter. 4. The measured IR surface temperature will appear at the center of the LCD (larger digits). The temperature displayed is the temperature of the area within the spot. 5. When the red IR button is released, the laser pointer will switch off and the reading will freeze (data hold) on the display for approx 10 seconds. 6. Note that the probe (Air Temperature wand) continues to monitor temperature during IR tests and its temperature is displayed on the top of the LCD (smaller digits). 7. After approx. 10 secs. the meter defaults to the Humidity and Air Temperature display. IR Spot Automatic Power OFF To conserve battery life the meter automatically shuts off after 10 minutes. o o F/ C buttons The Air Temperature and the IR Temperature units can be selected by the user. For Air o o Temperature, press the F/ C button on the bottom left. For the IR temperature units, press o o the F/ C button at the center of the meter. Data Hold Buttons Displays can be held (frozen) at any time by pressing the HOLD button. For Air Temperature, use the HOLD button on the bottom right. For IR Temperature and for Relative Humidity, use the HOLD button on the right center of the meter. Press HOLD again to exit the mode. Note that in IR temperature mode Data Hold is automatically engaged when the red IR button is released. MAX Buttons Press the MAX button (bottom of meter for Air Temperature; center of meter for IR temperature and Relative Humidity) to display only the highest reading. The displayed measurement will now only change when a higher reading is detected. Press the MAX button again to exit this mode. Backlight Press the backlight button to turn the light on. Press again to turn it off. 4 RH101 V2.1 8/07 InfraRed Measurement Considerations • When taking IR measurements the meter automatically compensates for ambient temperature changes. Note that it may take up to 30 minutes to adjust to extremely wide ambient changes. • Low temperature measurements quickly followed by high temperature measurements may require several minutes to stabilize as a result of the IR sensor cooling process. • If the surface of the object under test is covered with frost, oil, grime, etc., clean before taking measurements. • If an object's surface is highly reflective apply masking tape or flat black paint before measuring. • Steam, dust, smoke, etc. can obstruct measurements. • To find a hot spot, aim the meter outside the area of interest then scan across (in an up and down motion) until the hot spot is located. IR Theory IR thermometers measure the surface temperature of an object. The meter’s optics sense emitted, reflected, & transmitted energy that is collected and focused onto the meter’s detector. The meter’s circuitry translates this information into an LCD reading. IR Field of View Ensure that the desired target is larger than the spot size as shown in the diagram below. As the distance from an object increases, the spot size of the area measured by the meter becomes larger. The meter’s field of view ratio is 8:1, meaning that if the meter is 8 inches from the target, the diameter (spot) of the object under test must be at least 1 inch. Other distances are shown below in the field of view diagram. Distance to Object in inches 10” 8” 6” 0.75” 1” 1.25” Diameter of Spot in inches 12” 1.5” Emissivity Most organic materials and painted or oxidized surfaces have an emissivity of 0.95 (fixed setting in the model RH101). Inaccurate readings will result when measuring shiny or polished surfaces. To compensate, cover the surface under test with masking tape or flat black paint. Allow time for the tape to reach the same temperature as the material underneath then measure the temperature of the tape or the painted surface. 5 RH101 V2.1 8/07 Thermal Emissivity Table for Common Materials Material Emissivity Cloth (black) 0.98 Asphalt 0.90 to 0.98 Human skin 0.98 Concrete 0.94 Lather 0.75 to 0.80 Cement 0.96 Charcoal (powder) 0.96 Sand 0.90 Lacquer 0.80 to 0.95 Earth 0.92 to 0.96 Lacquer (matt) 0.97 Water 0.67 Rubber (black) 0.94 Ice 0.96 to 0.98 Plastic 0.85 to 0.95 Snow 0.83 Timber 0.90 Glass 0.85 to 1.00 Paper 0.70 to 0.94 Ceramic 0.90 to 0.94 Chromium oxides 0.81 Marble 0.94 Copper Oxides 0.78 Plaster 0.80 to 0.90 Iron Oxides 0.78 to 0.82 Mortar 0.89 to 0.91 Textiles 0.90 Brick 0.93 to 0.96 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. Battery Replacement The battery symbol to be replaced. appears on the lower right of the LCD when the 9V battery needs Replace the 9V battery as follows: 1. Turn the meter off and disconnect the air temperature probe. 2. Remove the large flat-head screw on the rear of the meter to remove the probe holder. 3. Remove the rubber holster that surrounds the entire meter by pulling it over the top of the meter. 4. Remove the small Phillips head screw on the rear of the meter. 5. Open the battery compartment and replace the 9V battery. 6. Re-assemble the meter before operating. 6 RH101 V2.1 8/07 Calibration A humidity calibration adjustment is located in the battery compartment. Cal Adjust 1. Remove the battery door and move the battery to one side. 2. Place the humidity probe in a humidity chamber or humidity calibration bottle and wait 20 minutes 3. Turn the meter on and turn the adjustment until the humidity reading on the display agrees with the calibration source. Battery Compartment 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. 7 RH101 V2.1 8/07 Warranty EXTECH INSTRUMENTS CORPORATION 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 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 ext. 210 for authorization or visit our website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an RA number). 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. ` Support Hotline (781) 890-7440 Tech support: Ext. 200; Email: [email protected] Repair/Returns: Ext. 210; Email: [email protected]; Website: www.extech.com Copyright © 2004 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form. 8 RH101 V2.1 8/07