User's Guide
Digital Psychrometer
Models RH300 and RH305 (kit)
ON/OFF |
HOLD |
T/DP |
/WB |
T1 |
T2 |
oC/oF |
RESET |
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 122.0oF (-68 to 50oC) (calculated from RH and Air |
|
|
temperature measurements) |
|
Wet Bulb |
-6.88 to 122.0oF (-21.6 to 50oC) (calculated from RH and Air |
|
|
temperature measurements) |
|
Operating Conditions |
-4 to 122oF (-20 to 50oC); < 99% RH non-condensing |
|
Storage Conditions |
-40 to 185oF (-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
3 |
ON/OFF |
HOLD |
8 |
4 |
T/DP |
/WB |
7 |
|
T1 |
T2 |
|||
|
|
|||
5 |
oC/oF |
RESET |
6 |
|
MX/MN |
2 |
RH300 |
V1.4 |
11/04 |
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