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User's Guide
Digital Psychrometer + IR Thermometer
Models RH401 and RH405 (kit)
C
DP
Wb
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H
umi
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.
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Summary of Contents for Extech Instruments RH401
- Page 1 Digital Psychrometer + IR Thermometer Models RH401 and RH405 (kit) 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.
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Page 2: Specifications
11. Air Temperature, Dew Point or Wet Bulb display 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 RH401 V1.4 11/07... -
Page 3: Operation
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. RH401 V1.4 11/07... - Page 4 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. RH401 V1.4 11/07...
- Page 5 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. RH401 V1.4 11/07...
- Page 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. RH401 V1.4 11/07...
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Page 7: Maintenance
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. RH401 V1.4 11/07... -
Page 8: Warranty
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...
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