Extech Instruments EA15-NIST User manual

User Manual
Thermocouple Datalogging Thermometer
Seven (7) Thermocouple input types K, J, T, E, R, S, N
Dual thermocouple Input with PC Interface
Model EA15
Additional User Manual Translations available at www.extech.com

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Introduction
Congratulations on your purchase of the Extech Datalogging Thermometer. The EA15 offers dual
thermocouple inputs with manual and automatic datalogging capabilities. The EA15 includes a PC
interface and WindowsTM compatible software for real-time monitoring and storage of temperature
data. This meter is shipped fully tested and calibrated and, with proper use, will provide years of
reliable service.
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

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Operation
Connecting thermocouples
1. This meter accepts two thermocouples with spade plugs (sub-miniature type K 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 the 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. When a
thermocouple is not plugged into the selected input, or if a thermocouple is "open", the display will
show "- - - - -". The default thermocouple type, units and display configuration are determined from
the parameters selected when the meter was last used.
Selecting thermocouple type
Press the TYPE button to select the type of thermocouple.
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) is the primary display; T2 (thermocouple 2) is the lower display
b. T2 is the primary display and T1 is the lower display
c. T1-T2 (difference between T1 and T2) is the primary display and T1 the lower display
d. T1-T2 is the primary display and T2 is the 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.
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 and 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 the 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 switch on the LCD display backlight. The backlight will
automatically switch off after one minute (press button again to turn the light off manually).

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Auto Power OFF
The meter will automatically switch off after 30 minutes of inactivity. 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 reactivate when the meter is 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.
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. Use the up/down 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.
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 up/down
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 the datalogging
session as this information is needed 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).
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. Download the stored data using the supplied software.
Note: MAX/MIN/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.

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Maintenance
Cleaning
The meter can be cleaned with a damp cloth. A mild detergent may be used but avoid solvents,
abrasives, and harsh chemicals.
Battery Installation / Replacement
The battery compartment is located on the back of the meter. The compartment is easily accessed
by removing the ‘flat head’ screw on the back of the meter, and removing the compartment cover.
Replace or install the six ‘AAA’ batteries observing polarity and re-assemble the battery
compartment. Please dispose of batteries responsibly and in accordance with all regulations.
Never dispose of used batteries or rechargeable batteries in household waste.
As consumers, users are legally required to take used batteries to appropriate collection
sites, the retail store where the batteries were purchased, or wherever batteries are sold.
Disposal: Do not dispose of this instrument in household waste. The user is obligated to
take end-of-life devices to a designated collection point for the disposal of electrical and
electronic equipment
Storing
When the meter is to be stored, please remove the battery and affix the sensor’s protective cover.
Avoid storing the meter in areas of extreme temperature and humidity.
FCC Statement
Warning: Changes or modifications to this unit not expressly approved by the party
responsible for compliance could void the user's authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a Class
B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not occur
in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:
–Reorient or relocate the receiving antenna.
–Increase the separation between the equipment and receiver.
–Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
–Consult the dealer or an experienced radio/ TV technician for help.

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Specifications
Measurement Ranges
K - Type : -150.0oC to +1370.0oC (-200.0oF to +1999.9oF)
J - Type : -150.0oC to +1090.0oC( -200.0oF to +1994.0oF)
T - Type : -150.0oC to +400.0oC (-200.0oF to +752.0oF)
E - Type : -150.0oC to +870.0oC (-200.0oF to +1598.0oF)
R - Type : 0.0oC to +1767.0oC (+32oF to +1999.9oF)
S - Type : 0.0oC to +1767.0oC (+32oF to +1999.9oF)
N - Type : -150.0oC to +1300.0oC (-200.0oF to +1999.9oF)
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 + 0.75oC (1.5°F)
below -100°C (-148°F): add 0.15% of reading for J, K, E and N;
0.45% of reading for T; and ±0.05 of reading +1°C(2°F) for R, S
Temperature Coefficient
0.01% of reading +0.06°F per °F (+0.03 °C) outside the specified
+18°C to 28°C (+64°F to 82°F) range
Below -100°C (-148°F): 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 0 to 50oC (32 to 122oF)
Operating Humidity < 80% RH
Storage Temperature -10 to 60oC (14 to 140oF)
Storage Humidity 10 to 80% RH
Dimensions 150 x 72 x 35mm (5.91 x 2.8 x 1.4")
Weight Approx. 235g(8.29 oz) with batteries
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