Extech RH305 Instruction Manual
User's Guide
Digital Psychrometer
Models RH300 and RH305 (kit)
ON/OFF
HOLD
T/DP
/WB
T1
T2
oo
C/ F
RESET
RESET
MX/MN
MX/MN
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.
Specifications
Function Range and Resolution Accuracy
Humidity 0.0 to 100.0% RH ±3% RH (10 to 90%) @ 23oC
Temperature (internal) -4.0 to 122.0oF (-20 to 50oC) ±1.8oF (±1oC)
Temperature (external) -4.0 to 158.0oF (-20 to 70oC) ±1.8oF (±1oC)
Display Triple LCD
Sensor Type Humidity: Precision capacitance sensor
Temperature: Thermistor
Response Time 60 seconds typical
Dew Point -90.4 to 122.0
o
F (-68 to 50oC) (calculated from RH and Air
temperature measurements)
o
Wet Bulb -6.88 to 122.0
F (-21.6 to 50oC) (calculated from RH and Air
temperature measurements)
Operating Conditions -4 to 122
Storage Conditions -40 to 185
o
F (-20 to 50oC); < 99% RH non-condensing
o
F (-40 to 85oC); <99% RH non-condensing
Power Supply 2 x 1.5V ‘AAA’ batteries
Battery Life Approx. 80 hours
Dimensions / Weight 7 x 1.9 x 1” (178.5 x 48.8 x 25.2mm); 4.9 oz. (140g)
Meter Description
1. Humidity Sensor & Air Temperature Sensor
2. Triple LCD Display
3. ON/OFF button
4. T1-T2/Dew Point/T1 button
5. °F/°C select
6. MIN/MAX/RESET button
7. T2-DP/Wet Bulb/T2 button
8. HOLD button
9. T2 Probe Jack
Note: The battery compartment is located
on the rear of the instrument
1
9
2
/WB
8
7
6
3
ON/OFF
HOLD
T/DP
4
5
2
T2
T1
RESET
oo
MX/MN
C/ F
RH300 V1.4 11/04
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