EA25 v3.1 8/13
2
Introduction
Congratulations on your purchase of the Extech EA25 EasyView Digital Hygro-Thermometer
Datalogger. This device measures and records Humidity, Temperature, Dew Point, and Wet Bulb
data in real-time. Careful use of this meter will provide years of reliable service.
Specifications
Function
Range and Resolution
Accuracy
Humidity
10.0 to 95.0% RH
±3% RH (at 25
o
C, 30 to 95% RH )
±5% RH (at 25
o
C, 10 to 30% RH )
Temperature*
-4 to 140
o
F (-20 to 60
o
C) ±1.8
o
F (±1
o
C)
Display
Multifunction LCD with bargraph and status indicators
Sensor Type
Humidity: capacitance sensor; Temperature: thermistor
Response Time
Humidity: 45% to 95% < 1 min; 95% to 45% < 3 min.
Temperature: Approx. 2 seconds for a 10
o
C change
Reading Rate
2 readings per second
RS-232 PC Interface
Optical connection with supplied interface cable. Software compatible
with Windows
TM
XP, Vista and Windows 7 systems
Datalogger storage
Stores 99 sets of data in manual mode (15,000 in auto mode)
Sampling Intervals
3 to 255 seconds (1 to 86,400 sec. using supplied software)
Operating Conditions
32 to 140
o
F (0 to 60
o
C); < 95% RH non-condensing
Storage Conditions
14 to 140
o
F (-10 to 60
o
C); <70% RH non-condensing
Power Supply
6 x 1.5V ‘AAA’ batteries
Auto power off
After 30 minutes of inactivity
Battery Life
Approx. 200 hours
Dimensions / Weight
5.9 x 2.8 x 1.4” (150 x 72 x 35mm); 8.3 oz. (235g)
