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Summary of Contents for Extech Instruments RH305
- Page 1 USER GUIDE Extech RH305 Hygro Thermometer Psychrometer Kit Extech RH305-NIST Hygro Thermometer Psychrometer Kit Digital Psychrometer Models RH300 and RH305 (kit) netzerotools.com...
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Page 2: Meter Description
netzerotools.com Introduction Congratulations on your purchase of the Extech RH300 Digital Psychrometer. This device measures Humidity, Air Temperature, Dew Point temperature and Wet Bulb temperature. Advanced features include External Temperature Measurement (with optional probe), Data Hold, selectable Auto Power Off, and MAX/MIN/Average reading. Careful use of this meter will provide years of reliable service. Meter Description Humidity Sensor &... -
Page 3: Display Description
netzerotools.com Display Description Relative Humidity % T1-T2 Dew Point Wet Bulb T2-Dew Point °C/°F Maximum 10. Minimum 11. Low Battery/Hold Operation Open the Protective Sensor Cap CLOSE OPEN Twist the protective sensor cap, located at the top of meter, counter-clockwise a quarter of a turn to expose sensor Plug in the optional external temperature probe (if needed). -
Page 4: Error Messages
netzerotools.com Wet Bulb and Dew Point measurements 1. To read the Wet Bulb measurement, press the button until the symbol Wb appears in the lower right display. Note: T2 will not be displayed unless the external probe is connected. 2. Wet Bulb temperature is now displayed. T/DP 3. - Page 5 Calibration The following verification and calibration procedures require the 33% and 75% RH reference bottles which are supplied with the Model RH305 kit. Accuracy Verification Checking the 33% or 75% RH Calibration: 1. Insert meter’s sensor into the 33% or 75% salt reference bottle.
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Page 6: Maintenance
netzerotools.com 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). -
Page 7: Specifications
netzerotools.com Specifications Range and Resolution Accuracy Humidity 0.0 to 100.0% RH ±3% RH (10 to 90%) @ 23 Temperature (internal) -20 to 50 C (-4.0 to 122.0 ±1 C (±1.8 Temperature (external) -20 to 70 C (-4.0 to 158.0 ±1 C (±1.8 Display Triple LCD...
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