EXTECH EA25 User Guide

User's Guide

EasyView Digital Hygro-Thermometer Datalogger

Model EA25

Introduction

Congratulations on your purchase of the Extech EA25 EasyView Digital Hygro­Thermometer 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 25oC, 30 to 95% RH )

±5% RH (at 25

o

C, 10 to 30% RH )

Temperature* -4 to 140oF (-20 to 60oC) ±1.8oF (±1oC)

* Dew Point and Wet Bulb temperatures have the same range as shown above

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

95/98, ME, 2000, and XP 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 secs. using supplied software)
Operating Conditions 32 to 140
Storage Conditions 14 to 140

o

F (0 to 60oC); < 95% RH non-condensing

o

F (-10 to 60oC); <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)

Meter Description

1. Humidity/Temperature Probe

2. Multifunction LCD with bargraph
and status indicators

3. Power ON/OFF button

4. MX/MN button

5. DATA HOLD button

6. Humidity / Temperature select
button

7. SET button

8. Units (C/F) select button

9. MEM (memory) button

10. ENTER button

11. READ button

12. DEW POINT temperature select
& left arrow button

13. UP/DOWN programming keys

14. WET BULB temperature select &
right arrow button

15. RS-232 optical jack

16. The battery compartment is
located on the rear of the instrument

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EA25 V2.1 02/06 2