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Summary of Contents for Extech Instruments RH25
- Page 1 USER GUIDE Heat Index Psychrometer Model RH25 ...
- Page 2 Introduction Thank you for selecting the Extech Instruments Model RH25 Heat Index Psychrometer. The RH25 measures Temperature and Relative Humidity (using precision capacitance RH sensor). The RH25 also calculates and displays Heat Index, Dew Point, Wet Bulb, and Wet Bulb Globe temperatures. The High Temperature Alarm feature alerts the user when Heat Index or Wet Bulb Globe levels exceed user‐preset limits. Data Hold and MIN/MAX/AVG memory utilities make it easier to recall important data. This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Please visit our website (www.extech.com) to check for the latest version of this User Guide, Product Updates, and Customer Support. Description Meter Sensor area Display area (LCD) POWER button HOLD button MODE button Battery compartment on rear of instrument Display TEMP Temperature ...
- Page 3 With the meter powered ON, press the HOLD button momentarily. The HOLD icon will appear and the current reading will freeze on the display. Press HOLD again to exit (the HOLD icon will switch OFF). Automatic Power OFF (Sleep) Mode The meter switches OFF automatically after 15 minutes of inactivity. To defeat this feature temporarily: With the meter switched OFF, press the HOLD and POWER buttons simultaneously until the meter displays the screen shown below. Now, the user must switch the meter OFF manually by pressing and holding the POWER button for at least 2 seconds. Note that the next time the meter’s power is cycled, the Auto Power OFF utility will again be active. 3 RH25‐EU‐EN v1.0 5/13 ...
- Page 4 F) for Wet Bulb Globe temperature alarm limits 9. When either alarm limit is exceeded, the meter continuously beeps. To determine which alarm is sounding, check the HI (Heat Index) and WB/HI (Wet Bulb Globe) temperature displays to see which unit of measure is blinking, that will indicate the tripped alarm. 10. To silence an alarm the user must either switch the alarm OFF or change its alarm limit value. Error Message Displays E‐2: Humidity Sensor failure. Replace unit. E‐3: Temperature Sensor failure. Replace unit. E‐4: Temperature over‐range; E‐5: Temperature under‐range E‐6: Hardware failure. Replace unit 4 RH25‐EU‐EN v1.0 5/13 ...
- Page 5 134 145 Appendix C – Heat Index and Health Effects Heat Index of 80 to 90 F: Fatigue possible with prolonged exposure and physical activity Heat Index of 90 to 105 F: Sunstroke, heat cramps, and heat exhaustion possible Heat Index of 105 to 130 F: Sunstroke, heat cramps, heat exhaustion likely; heat stroke possible Heat Index of 130 F or greater: Heat stroke highly likely with continued exposure The Heat Index is determined using the dry bulb temperature and the relative humidity. It is based on charts available through the U.S. National Weather Service. The Heat Index represents how an average person feels relative to climate conditions. For a given temperature, the higher the humidity, the higher the heat index will be. 5 RH25‐EU‐EN v1.0 5/13 ...
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Page 6: Specifications
F) Wet Bulb ‐20 to 50 C (‐4 to 122 F) Wet Bulb Globe ‐25 to 54.5 C (‐13 to 130 F) Relative Humidity 0 to 99.9% RH o Resolution F/%RH Accuracy Temperature ±0.6 C (1 F) o Relative Humidity ±3%RH @ 25 C from 10 to 90% RH otherwise ±5% RH Power supply 1 x CR2032 Lithium Battery Dimensions 140 x 35 x 18mm (5.5 x 1.4 x 0.7") Weight 50g (1.8 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 6 RH25‐EU‐EN v1.0 5/13 ...
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