Extech Instruments EA25 Bedienungsanleitung

User's Guide

EasyView Digital Hygro-Thermometer

Datalogger

Model EA25

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

EA25 v3.1 8/13

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 25oC, 30 to 95% RH )

±5% RH (at 25oC, 10 to 30% RH )

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

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 10oC change

Reading Rate 2 readings per second

RS-232 PC Interface Optical connection with supplied interface cable. Software compatible

with WindowsTM 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 140oF (0 to 60oC); < 95% RH non-condensing

Storage Conditions 14 to 140oF (-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)

EA25 v3.1 8/13

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

EA25 v3.1 8/13

Operation

Turn Power ON or OFF

1. Press the button to turn the meter on or off. The meter will perform a short self-test when

turned on.

2. The meter automatically turns off after 30 minutes of inactivity unless the MX/MN or Datalogging

modes are active.

Taking Measurements

1. Hold the probe in the air in the area to be tested. Do NOT immerse in liquid.

2. Allow adequate time for readings to stabilize.

3. Read the measurements on the LCD. The bargraph tracks the large digit display.

4. The %RH/TEMP button allows the user to choose whether the temperature or the humidity is

displayed on the large digit display.

Selecting temperature units of measure (C/F)

Press the oC/oF button momentarily to toggle the temperature units.

Maximum and Minimum recording (MX/MN)

NOTE: The Automatic Power OFF feature will be disabled while in the MX/MN mode.

The MX/MN mode allows the user to view only the highest and lowest readings while taking

measurements. (MX stands for maximum and MN for minimum).

1. Press the MX/MN button momentarily to start the elapsed timer and begin recording. The display

will now show only the highest reading (the MX icon will appear).

2. Press the MX/MN button again to view the lowest reading (MN will appear).

3. The SET button allows the user to view the elapsed time for a particular MX or MN reading in

Minutes:Seconds (59mins:59secs max) or Days:Hours (99days:24hours max).

4. To check the highest and lowest Dew Point or Wet Bulb temperatures, use the DEW and the

WET buttons.

5. The following data displays are available in the MX/MN mode:

Maximum and Minimum Humidity with the associated Temperature

Maximum and Minimum Temperature with the associated Humidity

Maximum and Minimum Dew Point temperature with the associated Temperature or Humidity

Maximum and Minimum Wet Bulb temperature with associated standard temperature or

humidity

6. To exit MX/MN mode, press and hold the MX/MN button (the MX/MN icons disappear).

Data Hold

Press the Hbutton momentarily to freeze the displayed reading. The 'H' icon will appear on the

upper left-hand side of the display. Press the Hbutton again to return to normal operation (the 'H'

hold icon will disappear).

DEW POINT and WET BULB Temperature Display

Dew Point and Wet Bulb temperatures are calculated by the meter based on humidity/temperature

measurements. To view the Dew Point or Wet Bulb temperatures, press the DEW or WET button

momentarily. The ‘DEW’ or ‘WET’ display icon will appear on the right side of the LCD and the

temperature will display on the bottom (larger) digits. The upper (smaller) digits will display the

regular temperature in oC or oF or the humidity in RH% (use the %RH/TEMP button to toggle

between the two).

EA25 v3.1 8/13

Manual Datalogging

Clearing Previously Stored Data

1. Press the “ ” button to turn the meter off.

2. Press and hold the "MEM" button, then press the “ ” button to turn the meter on. When the

LCD indicates "CLr", the entire memory has been erased.

Manual Datalogging

1. Press the "MEM" button to store a reading manually. The LCD will display the "M" icon and the

address number. The total memory size for manual recording is 99 sets.

2. When the datalogger memory is full, the LCD will display "Full".

Recalling manually stored data

1. Press the "READ" button to view stored data. The LCD will show the "R" (recall) icon and the

current address number.

2. Use the " " or " " button to select another memory address to view.

3. Press the DEW or WET button to display the Dew Point or the Wet Bulb value.

4. Press " " (enter) to exit this mode.

Automatic Datalogging

NOTE: Before datalogging ensure that previous data has been downloaded otherwise it

will be lost. Up to 15,000 sets of data can be recorded in automatic datalogging mode.

ALL of the following settings must be configured before datalogging:

Real-Time Clock: Set to the current time in hours, minutes, and seconds

Start Time: Set the time that datalogging will automatically begin

Stop Time: Set the time that datalogging will automatically stop

Interval Time: Set the sampling rate (time between logged readings)

Real-Time Clock Setting

1. Press the button to power the meter.

2. Press and hold the SET button until two beeps

sound (screen shown at right appears). Note

that if the "" logging icon is already on the

LCD before pressing the SET button, the meter

is already datalogging and cannot be

programmed. To stop logging press " " (enter

button).

3. Press " " or " " to set the current hour.

4. Press "" to move to the two flashing digits representing minutes.

5. Press " " or " " to set the current minutes.

6. Press "" to move to the two flashing digits representing seconds.

7. Press " " or " " to set the current seconds.

8. Press " " (enter) to store the time and move to the next screen.

EA25 v3.1 8/13

Datalogging Start-Time (St) Setting

1. The Datalogging start-time screen displays

"St1" and two flashing digits (for the hour).

2. Press " " or " " to set the hour of the day

that datalogging will begin.

3. Press "" to move to the two flashing digits

representing minutes.

4. Press " " or " " to set the desired minute

that datalogging will begin.

5. Press "" to move to the two flashing digits representing the seconds.

6. Press " " or " " to set the desired second that datalogging will begin.

7. Press " " (enter key) to store the datalogging start-time and move to the next screen.

Datalogging Stop-Time (SP) Setting

1. The Datalogging stop-time setting screen shows

"SP1" and the two flashing numbers (for the hour).

2. Press " " or " " to set to the desired hour of

the day that datalogging will end.

3. Press "" to move to the two flashing digits

representing minutes.

4. Press " " or " " to set the desired minute that

datalogging will end.

5. Press "" to move to the two flashing digits representing seconds.

6. Press " " or " " to set the desired second that datalogging will end.

7. Press " " (enter key) to store the datalogging stop-time and move to the next screen.

Datalogging Sampling Interval Setting

1. "INTV" (interval) appears along with the current

interval selection (in seconds).

2. Use the " " or " " buttons to change the

number of seconds (3 to 255). For example, with

003 selected a reading will be automatically recorded every three seconds.

3. Press " " (enter key) to store the sampling interval rate and begin datalogging.

Datalogging Mode

1. In datalogging mode, the LCD will continue to display the "" (logging icon). The LCD will also

flash the "M" icon each time a reading is logged. The meter will shut off when the Stop time is

reached.

2. Use the " " button to display the Start-Time and the " " button to display the Stop-Time.

3. Press "" (enter) to stop datalogging and exit the datalogging mode ("" will disappear).

Note: Readings automatically logged can only be viewed by downloading them to a PC.

EA25 v3.1 8/13

Datalogging Software

The instructions on how to install the datalogging software are printed on the Software CD label.

The software operating manual can be found on the CD.

Note that the software is compatible with WindowsTM XP, Vista and WindowsTM 7 operating

systems.

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).

Battery Replacement

When the battery power falls low, the ‘BT’ symbol will appear on the LCD. Replace the six 1.5 ‘AAA’

batteries by removing the rear battery compartment screw and accessing the battery compartment.

Check that the polarity (orientation) is correct when placing the batteries in the compartment.

Ensure that the compartment cover is securely fastened when finished.

Calibration and Repair Services

Extech offers complete repair and calibration services for all of the products we sell. For

periodic calibration, NIST certification or repair of this Extech product, call customer service for

details on services available. Extech recommends that calibration be performed on an annual basis

to ensure calibration integrity.

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