Extech Instruments EA15 Manuale utente

User Guide

Thermocouple Datalogging Thermometer

Seven (7) Thermocouple input types K, J, T, E, R, S, N

Dual thermocouple Input with PC Interface

Model EA15

Introduction

Congratulations on your purchase of the Extech Datalogging Thermometer. This device

offers dual thermocouple inputs with manual and automatic datalogging capabilities.

Careful use of this meter will provide years of reliable service.

Model EA15 Version 1.5 9/03

Specifications

Measurement Ranges K - Type : -200.0oF to +1999.9oF (-150.0oC to +1370.0oC)

J - Type : -200.0oF to +1994.0oF (-150.0oC to +1090.0oC)

T - Type : -200.0oF to +752.0oF (-150.0oC to +400.0oC)

E - Type : -200.0oF to +1598.0oF (-150.0oC to +870.0oC)

R - Type : +32oF to +1999.9oF (0.0oC to +1767.0oC)

S - Type : +32oF to +1999.9oF (0.0oC to +1767.0oC)

N - Type : -200.0oF to +1999.9oF (-150.0oC to +1300.0oC)

Resolution J, K, T, E, N Type: 0.1oF/oC/K

R, S Type: 1.0oF/oC/K (0.1° for reference only)

Accuracy

J, K, T, E, N Type: ±(0.05% reading + 1.5oF (0.75°C)

below -148°F (-100°C): add 0.15% of reading for J, K, E and N;

0.45% of reading for T; ±0.05 of reading +2°F(1°C) for R, S

Temperature Coefficient 0.01% of reading +0.06°F per °F (+0.03 °C) outside the specified

+64°F to 82°F (+18°C to 28°C) range

Below -148°F (-100°C): add 0.04% of reading for J, K, E and N

type; and 0.08% of reading for T type

Note: Temperature accuracy does not include the accuracy of the probe.

Note: The temperature scale is based on the international temperature scale of 1990 (ITS90).

Display Dual Display Multi-function LCD with Backlight

Input Protection 60VDC; 24VAC rms

Measurement Rate 1 time per 1.5 second

Over range indication "OL" appears on the LCD

Open input indication "OL" appears on the LCD

Low battery indication “BT” appears on the LCD

Manual Memory Capacity 98 sets

Datalogging Memory Capacity 8800 sets

Power supply 6 ‘AAA’ Batteries

Battery life Approximately 200 hours with alkaline batteries

Operating Temperature 32 to 122oF (0 to 50oC)

Operating Humidity < 80% RH

Storage Temperature 14 to 140oF (-10 to 60oC)

Storage Humidity 10 to 80% RH

Dimensions 5.91 x 2.8 x 1.4" (150 x 72 x 35mm)

Weight Approx. 8.29 oz. (235g) with batteries

Model EA15 Version 1.5 9/03

Meter Description

1. RS-232 and thermocouple input jacks

2. LCD display

3. Power, Data Hold, and Backlight buttons

4. Max/Min, display select, and units buttons

5. MEM, input TYPE, and READ buttons

6. SET button

7. Battery compartment (rear)

8. Up/Down scroll button

9. Enter Button

Operation

Connecting thermocouples

1. This meter accepts two thermocouples with spade plugs (sub-miniature type with one

spade wider than the other).

2. Plug the thermocouple(s) into the meter's T1 and/or T2 thermocouple input jack(s).

3. Always check LCD display for the proper thermocouple type selection..

Turn Power ON

Press the button to turn power on. The meter will perform a short self-test. If a

thermocouple is not plugged into the selected input or if the thermocouple is "open", the

display will show "- - - - -". The default thermocouple type, units and display is determined

from the parameters selected when the meter was last used.

Selecting thermocouple type

Press the TYPE button to select the type of thermocouple being used.

Selecting °C, °F or °K units of measure

Press the C/F/K button to select the unit of measure.

Selecting T1, T2, and T1-T2 Displays

Press the T1 T2 T1-T2 button to step through and select from the following displays:

a. T1 (thermocouple 1) primary display and T2 (thermocouple 2) lower display.

b. T2 primary display and T1 lower display

c. (T1-T2) (difference between T1 and T2) primary display and T1 lower display

d. (T1-T2)primary display and T2 lower display

Notes:

•To avoid electrical shock or personal injury, do not apply more than 20Vrms, between

the thermocouples, or between any thermocouple and earth ground.

•If voltage on the measurement surface results in potentials of more than 1V,

measurement errors may occur.

•If a potential exists between the thermocouples, use electrically insulated

thermocouples.

TYPE

KJTERSN MX AVG-MN

INTERVAL

mi n : se c

hour:min

7 8 9

Model EA15 Version 1.5 9/03

Data Hold

Press the HOLD button to freeze the displayed reading. The 'H' hold icon will appear on

the display. Press the HOLD button again to return to normal operation.

MIN, MAX, AVG Recording Function with Timer

Press the MX/MN button to begin capturing the Minimum (MN),

Maximum (MX), and Average (AVG) temperature values. The

Elapsed Time clock will appear on the lower left of the display.

The primary display shows the current temperature. The lower

display will indicate the MX, MN or AVG value (depending on

which is selected) captured since the MX/MN button was

pressed.

1. Press the MX/MN button to step through the MX, MN or AVG display Each reading

will be accompanied by a Timer value indicating the time when each reading was

recorded

2. Press and hold the ‘↵’ button to change the elapsed time format from min:sec to

hour:min

3. Press and Hold the MX/MN button to exit the MX/MN function.

Backlight

Press the backlight button to turn on the LCD display backlight. The backlight will

automatically turn off after one minute (or press the button again to turn the light off

manually).

Auto Power OFF

The meter will automatically turn off after 30 minutes if no keys are pressed during this

period. AUTO POWER OFF is disabled in the max/min and datalogging modes.

To disable AUTO POWER OFF manually:

1. Hold the enter button ‘↵’ while turning power on.

2. The AUTO POWER OFF function will be reactivated when the meter is manually

turned off.

Turning Power OFF

Press the button to turn power off.

Manual Datalogging

Manual datalogging allows the user to store and recall up to 98 temperature readings with the

press of a button.

1. Press the MEM button to manually store a single reading

into memory. The ‘MEM’ icon and location number of the

reading will appear on display for two seconds and then the

normal display will return.

2. To view stored readings, press the READ button. The

memory location number will briefly appear and then the

‘READ’ icon and the stored values will appear on the

display

3. Press the ▲and ▲buttons to scroll through the memory locations and view the

logged readings.

4. Press the ‘READ’ button to exit the read mode

5. Press and hold the MEM button while turning the meter on

to clear the memory. When the LCD indicates "CLr", the

memory has been cleared.

Model EA15 Version 1.5 9/03

Automatic Datalogging

Automatic datalogging allows the user to store up to 8,800 temperature readings in memory

for later downloading and viewing using the supplied software. The storage interval rate is

programmable from 3 to 255 seconds.

1. Press and HOLD the SET button for two seconds to

enter the interval programming screen. The ‘MEM’ and

‘INTERVAL’ icons and interval time will appear on the

display. Use the ▲and ▲buttons to scroll through the

available intervals (3 to 255 seconds). Press the ‘↵’

button to select the desired logging interval

2. Make note of the start time (time of day) for your

datalogging session as you will be prompted for this

information when downloading the data.

3. Press and hold the MEM button for two seconds to enter the datalogging mode. The

‘MEM’ icon on the center of the display will flash each time a record is stored (at the

interval selected above). When the memory is full, ‘FULL’ will appear on the display

and the meter will stop logging data.

4. To stop and exit the datalogging mode, press the MEM button.

5. To download data, read the datalogging sections below.

Note: Max/Min and AVG functions can be used with the meter in datalogging mode

Clearing 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.

Datalogging Software

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

label. After reading the label’s

directions, load the software CD in the

PC CD-ROM drive.

When the program is opened a COM

PORT selection screen appears. Select

either COM 1 or COM 2 depending on

which computer port will be used to

connect to the meter with the supplied

cable (the cable connects to the top of

the meter and to a DB9 9-pin COM

PORT on the PC).

Once the COM PORT selection is

correctly made, the meter and PC begin

communicating. The main software

screen, shown at right, appears. The

menu icons at the top of the screen are

explained below.

Model EA15 Version 1.5 9/03

SAVE FILE ICON

The SAVE FILE icon is the first icon on the left (floppy disk symbol). Click on this icon to

save recorded data to a text file. When clicked, the PC will prompt for a filename and

location. Once saved, this file can be opened in other programs such as spreadsheets,

word processors, and databases.

OPEN FILE ICON

The OPEN FILE icon is located second from left. Click to open a file that has already been

saved.

DATA LIST ICON

The LIST icon is located third from left on the main

software screen. When clicked, data is shown on

the screen in list format (shown at right). To save,

graph, or print the list, click the SAVE, GRAPH, or

PRINT icons in the Data List window.

DATA GRAPH ICON

The GRAPH icon is located fourth from left. When

clicked, the data is shown on an x-y graph (see

diagram below). The vertical axis represents the temperature units; the horizontal axis

represents the time.

Click on the PRINT to get a hard copy of the

graph. Press the four-arrow icon (next to the

PRINT icon) to change the scale and to

select data range to be viewed. See

diagram below

SAMPLING INTERVAL

The INTERVAL icon (2nd icon from right) allows the user to change the number of

seconds that the meter waits before

logging a reading. If the interval is set to

5 seconds, the meter will record a

reading every 5 seconds, for example.

The range is 1 to 86,400 seconds.

Model EA15 Version 1.5 9/03

MIN/MAX/AVG ICON

The AVG icon (3rd icon from right) allows the user to view maximum, minimum and

average readings for T1 and T2 inputs in real time

when the meter is connected to the RS232 Port

via the optical cable.

Downloading Readings from the Meter to a PC

With the meter connected to the PC (as described earlier)

and the software running, click on the datalogger

download icon (first icon from the right) to begin

downloading data from the meter to the PC.

When the screen shown at right appears, select a set to

view by clicking on its number. A set is simply a datalog

session. Data will be displayed in the data list format

described earlier in DATA LIST ICON.

Once a data set has been selected

the screen shown below will appear.

Enter the time of day datalogging

began as noted earlier (in

HR:MN:SC format).

Model EA15 Version 1.5 9/03



Support Hotline (781) 890-7440

Tech support: Ext. 200; Email: [email protected]

Repair/Returns: Ext. 210; Email: repair@extech.com

Website: www.extech.com

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and

workmanship for one year from date of shipment (a six month limited warranty applies on sensors and

cables). If it should become necessary to return the instrument for service during or beyond the warranty

period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our

website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an RA

number). A Return Authorization (RA) number must be issued before any product is returned to Extech. The

sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in

transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper

wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification.

Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and

will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited

to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty,

whether written or oral, is expressed or implied.

Calibration and Repair Services

Extech offers complete repair and calibration services for most products we sell. For

periodic calibration, NIST certification or repair on most Extech products, 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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