Digi-Sense 20250-02 User manual

User Manual
THE STANDARD IN PRECISION MEASUREMENT
Thermocouple Thermometer
with Dual Type K/J Inputs
and Data Logging
with NIST-Traceable Calibration
Model 20250-02

2
Introduction
The Digi-Sense Thermocouple Thermometer with Dual
Inputs and Data Logging (Model 20250-02) offers fast
response and high accuracy. This thermometer accepts
two thermocouple sensors (type K or J). Advanced features
include data logging, USB interface, relative time clock,
offset compensation, temperature differential, data Hold,
Max/Min/Avg readings, and auto power-off. The instrument
is fully tested and calibrated to NIST-traceable standards.
Careful use of this meter will provide years of reliable
service.
Unpacking
Check individual parts against the list of items below.
If anything is missing or damaged, please contact your
instrument supplier immediately. will provide years of
reliable service.
1. Meter
2. Two type K flexible probes
3. USB cable
4. Software
5. Three AAA batteries
6. User manual
7. NIST-traceable calibration report with data

3
Key Features
• Large backlit display shows any combination of T1, T2,
T1–T2; plus Max, Min, and Avg readings
• Relative time clock on Max/Min/Avg provides a time
reference for major events
• Electronic Offset function allows compensation of
thermocouple errors to maximize overall accuracy
• USB interface
• Data logging capacity of 18,000 sampling points
• User-selectable readout in °C, °F, or Kelvin (K)
• Automatic power-off (sleep) mode conserves
battery life
• Dual sensor inputs; accepts a wide variety of
type K and type J thermocouple probes

4
Meter Description
1. Temperature sensor inputs (2)
2. LCD
3. SET /
backlight button
4. (Up)/T1–T2 button
5. Units (°C/°F/K) button
6. (Return)/Max/Min button
7. Hold/(Down) button
8. Rec/Enter button
9. Power on/off button
5
6
1
4
7
8
9
3
2

5
Display Layout
1. T1, T2, T1–T2 icons
2. HOLD icon
3. Auto power-off icon
4. Primary temperature
display
5. User-selectable temper-
ature units (°C/°F/K)
6. Secondary display
(Max, Min, Avg, Offset,
T1, or T2 reading)
7. MAX, MIN, AVG icons
11
12
2
1
3
4
5
6
7
8
910
13
14
8. Tertiary display (elapsed
time)
9. Time icon (hour:min or
min:sec)
10. SETUP mode icon
11. Low-battery indicator
12. Thermocouple type icon
(K or J)
13. OFFSET icon
14. REC icon (data logging)

6
Setup and Operation
1. Press Power on/off button to turn the unit on. The
value immediately shown is the number of data
logging sample points remaining (from 18,000 to 0).
After one second, the display will then switch to the
temperature measurement reading mode.
2. Press Rec/Enter button for three seconds to start
recording and press again for three seconds to stop
recording. When the thermometer is in Setup mode,
press Rec/Enter button to enter a setup option and
press Rec/Enter button again to store the displayed
setting in memory.
3. Press /T1–T2 button to toggle showing the T1, T2,
and T1–T2 (differential temperature) measurements
in the primary and secondary displays. When the meter
is in Setup mode, press /T1–T2 button to scroll to
the Setup option you want to change or press
/T1–T2 button to increase the displayed setting.
4. Press Units button to switch between Celsius (°C),
Fahrenheit (°F), and Kelvin (K).
5. Press Hold/button to freeze or unfreeze the
displayed readings. When the meter is in Setup
mode, press Hold/button to scroll to the Setup
option you want to change or press Hold/button
to decrease the displayed setting.
6. Press /Max/Min button to step through the maxi-
mum, minimum, and average readings. To exit the
Max/Min/Avg mode, press and hold the /Max/Min
button for three seconds to return to normal operation.
7. Press Set/backlight button to turn the backlight on
and off. Press and hold the Set/backlight button for
three seconds to enter or exit the Setup mode. (See
"Changing Setup Options")

7
Setup Mode
Use the Setup mode to change offset, sample rate, time,
clear data logging memory, and sleep mode settings. The
thermometer stores the settings in its memory.
Entering or Exiting Setup Mode
When the thermometer is in Setup mode, the display
shows the SETUP icon. Press and hold SET button for three
seconds to enter or exit the Setup mode.
Changing Setup Options
1. Press /T1–T2 button or Hold/button to scroll to the
Setup option you want to change.
2. Press Rec/Enter button to indicate that you want to
change this setting.
3. Press /T1–T2 button or Hold/button until the setting
you want to use appears on the display.
4. Press Rec/Enter button to store the new setting into
memory.
Note: Setup is disabled in the Max/Min and Rec/Enter
modes.
Option Menu item Settings
Offset T1, T2 T1 , T2 offset
Sample rate rAt Sampling of recording
Time setting tiE Show the time or set the time
Clear data logging
memory CLR Clear the memory operation
Sleep mode SLP On (sleep mode on) or
OFF (sleep mode off)

8
Setup Mode (continued)
Offset Function
The primary display shows the
temperature plus the offset and the
secondary display shows the offset.
You can store individual offsets for
T1 and T2.
1. When the meter is in Setup mode,
the display shows the SETUP icon.
Press /T1–T2 button or Hold/
button to scroll to the T1 offset
setup option screen. Fig. 1
2. Press Rec/Enter button to access the T1 offset value
shown in the secondary display.
3. Press /T1–T2 button or Hold/button until the setting
you want to use appears on the display (Fig. 1). Press
Rec/Enter button to store the new setting in memory
and continue to T2 offset.
Using the Offset to Adjust for Probe Errors
Use the offset option in the Setup mode to adjust the
thermometer’s readings to compensate for the errors of a
specific thermocouple. The allowable adjustment range is
±9.0°F or ±5.0°C.
1. Plug the thermocouple into the input connector.
2. Place the thermocouple in a known, stable temperature
environment (such as an ice bath).
3. Allow the readings to stabilize.
4. In the Setup mode, change the offset until the primary
reading matches the calibration temperature. (See
“Changing Setup Options")

9
Sample Rate of Data Recording
1. Press and hold SET button for
three seconds to enter the
Setup mode. While in Setup
mode, the display shows the
SETUP icon.
2. Use the /T1–T2 and Hold/
buttons to scroll to the rate set-
ting option screen (see Fig. 2).
3. Press Rec/Enter button to
access the “00:01” (minute,
second) value shown in the
tertiary display (see Fig. 2).
Fig. 2
Fig. 2
4. Press /Max/Min button until the minute value is
flashing. Use the /T1–T2 and Hold/buttons to
set the desired value.
5. Press /Max/Min button again until the second
value is flashing. Use the /T1–T2 and Hold/
buttons to set the desired value.
6. Press Rec/Enter button to store the new setting in
memory.
7. Note: When the meter is powered down, the default
sample rate is the last setting.

10
Setup Mode (continued)
Time Setting Function
1. Press and hold SET button for
three seconds to enter the
Setup mode. While in Setup
mode, the display shows the
SETUP icon.
2. Use the /T1–T2 and Hold/
buttons to scroll to the time
setting option screen (Fig. 3).
3. Press Rec/Enter button to
access the values (Fig. 4). The
primary display shows the
year, the secondary display
shows the month and day, the
tertiary display shows the hour
and minute.
4. Press /Max/Min button until
the year value is flashing. Use
the /T1–T2 and Hold/but-
tons to set the desired value.
5. Press /Max/Min button again
until the month value is flash-
ing. Use the /T1–T2 and
Hold/buttons to set the
desired value.
Fig. 3
Fig. 4
Fig. 3
Fig. 4
6. Press /Max/Min button again until the day value
is flashing. Use the /T1–T2 and Hold/buttons
to set the desired value.

11
7. Press /Max/Min button again until the hour value is
flashing. Use the /T1–T2 and Hold/buttons to set
the desired value.
8. Press /Max/Min button again until the minute value
is flashing. Use the /T1–T2 and Hold/buttons to
set the desired value.
9. Press Rec/Enter button to store the new setting in
memory.
Clear Memory Operation
Immediately after turning on the meter, the first value
shown is the number of data logging sample points
remaining (from 18,000 to 0). Once the memory is full,
the first value shown will be “FULL” rather than a number.
Or if you try to record, the REC icon will flash five times
and disappear. At this point, you are no longer able to
record until the memory is cleared.
Fig. 5
Fig. 5
1. Press and hold SET button for
three seconds to enter the
Setup mode. While in Setup
mode, the display shows the
SETUP icon.
2. Use the /T1–T2 and
Hold/buttons to scroll to
the CLR memory option
screen (Fig. 5). The screen
indicates the number of sam-
ple points remaining.
3. Press Rec/Enter button and
“No” appears on the screen.
(Fig. 5)
Screen shows 17,985
readings left in memory.

12
Setup Mode (continued)
4. Press /T1–T2 button or Hold/button until the
display shows “YES”, indicating the memory will be
cleared.
5. Press Rec/Enter button to select the “YES” setting
and clear the memory. Data logging capacity now
returns to 18,000 sample points.
Fig. 6
Auto Power-Off (APO)/Sleep Mode
The meter’s default mode is to auto-
matically shut off after 15 minutes
of non-use. To disable the auto
power-off mode, enter the Setup
mode.
1. While in Setup mode, press
/T1–T2 or Hold/button to
scroll to the “SLP” option screen
(Fig. 6).
2. Press Rec/Enter button to display
“On.”
3. Use the /T1–T2 and Hold/
buttons to toggle between “On”
(sleep mode on) or “Off” (sleep
mode off).
4. Note: Meter defaults back to “On”
once meter is powered off.

13
Measuring Temperatures
1. Plug the thermocouple(s) into the T1 or T2 input
connector(s). Make sure that the polarity is correct.
2. Press Power on/off button to turn the unit on. The
value immediately shown is the number of data log-
ging sample points remaining (from 18,000 to 0).
After one second, the display will then switch to the
first temperature measurement reading.
Note: If no thermocouple is plugged into the
selected input or the thermocouple is not connected
properly, the display shows "- - - - ". If the tempera-
ture being measured is outside the thermocouple’s
valid range, the display shows “OL” (overload).
3. Set the thermometer for the correct thermocouple
type (K or J) in the Setup menu.
4. Press the Unit button to select the desired tempera-
ture scale (°C, °F, or K).
5. Hold or attach the thermocouple(s) to the measure-
ment location. The temperature reading appears in
the primary display. Use the /T1–T2 button to
toggle between showing the T1, T2, and T1–T2
readings in the primary or secondary display.

14
Hold Function
1. Press Hold/button to freeze the readings on the
display. The display shows the HOLD icon.
2. Use the /T1–T2 button to toggle between showing
the T1, T2, and T1–T2 readings in the primary or
secondary display.
3. Press Hold/button again to turn off the Hold
function.
Max/Min/Avg Functions
1. Press /Max/Min button to step through the maximum
(MAX), minimum (MIN), and average (AVG) readings.
The elapsed time since entering MAX/Min mode, or the
time at which the maximum or minimum reading
occurred, appears on the display.
2. Press and hold /Max/Min button for three seconds to
exit MAX/MIN mode.

15
Recording/Data Logging Operation (Meter)
Fig.7
1. Press Power on/off button to turn
the unit on. The first value imme-
diately shown is the number of
data logging sample points
remaining. (Fig. 7)
2. Press and hold Rec/Enter
button for three seconds until
the REC icon appears. The meter
is now data logging temperature
readings.
3. Press and hold Rec/Enter button
again for three seconds to stop
data logging function.
4. Note: A maximum of 18,000 sam-
ple points is available (Fig. 7). As
you log temperature readings,
this value will be lower each time
you turn the meter. When the
memory is full (with 0 sample
points remaining), the first value
shown will be “FULL” rather than
a number. Or if you try to record,
the REC icon will flash five times
and disappear. At this point, you
are no longer able to record until
the memory is cleared. (See
"Changing Setup Options",
"Clear Memory Operation")
Fig. 7
Screen shows 18,000
readings left in memory.

16
Recording/Data Logging Operation (Software)
1. First install software on PC following the setup wizard (see
“Software Installation” on next page). Once software is
successfully installed, the “MultiDL” software icon shortcut
will be automatically placed on your PC desktop.
2. Connect the meter to your PC via the supplied USB cable.
3. Power the meter on.
4. Open the installed Multi Data Logger Software by double-
clicking on the “MultiDL” icon on your PC desktop.
5. When opened, double-click on the image of the meter
located in the left-hand white pane box. This will activate
the image of the meter’s screen to illuminate.
6. On the menu bar, select the PC image icon (when mouse is
dragged over the icon, it is titled “Data Logger Setting”).
7. In the Data Logger Setting menu confirm time and select
date format, sampling rate, memory full directions, auto
power-off status, and start method, then select “OK”.
You must set these parameters before meter will record
measurements.
8. Note: Manual start method is controlled by pressing
Rec/Enter button on the meter. Automatic start method will
instantly activate recording via the software once selected.
9. In manual record mode, press and hold Rec/Enter button
on the meter for three seconds until the REC icon is dis-
played on the screen. This will indicate that recording func-
tion has been activated. Upon completion of desired data
logging of measurements, press and hold Rec/Enter but-
ton for three seconds until the REC icon disappears from
the screen, indicating data logging has been deactivated.

17
10. To download the data to the PC, select the downward-
facing arrow in menu bar in the software window. The
software screen will display the data being downloaded
from the meter. Upon completion of downloading the
data to the PC, the data results will be displayed
graphically.
11. To save the measurement data to your PC select the
“Data List” tab to open the list of measurements
recorded. Select “File” icon from the menu bar and save
data to desired location on your PC. Note: Data will be
saved in an Excel®format that will include all summary
information as captured on the “Data Summary” tab.
12. To print recorded data, simply select the “print” icon
on the menu bar.
Software Installation
1. Insert the CD into the PC.
2. Double-click the set up.exe file to launch the software
installation program.
3. Follow the installation wizard to complete the installation.
4. If the USB driver needs to be updated or driver error
message is received, please got to the folder with driver
on the CD and double-click the file CP210xVCPInstaller.exe
to update the driver.
5. Upon successful installation of the software, the
“MultiDL” software icon shortcut will be automatically
placed on your PC desktop.

18
Range
Type K thermocouple(s) –328 to 2501°F (–200 to 1372°C)
Type J thermocouple(s) –346 to 2012°F (–210 to 1100°C)
Resolution
Temperature display 0.1 below 1000 or 1 above 1000
Accuracy
T1, T2 temperatures above
–148°F (–100°C) ±[0.5% rdg + 1.8°F (1°C)]
T1, T2 temperatures below
–148°F (–100°C) ±[0.5% rdg + 3.6°F (2°C)]
T1–T2 temperature
differential ±[0.5% rdg + 3.6°F (2°C)]
Specifications
Auto power-off Unit shuts off automatically after 15 minutes
to preserve battery life
Operating
temperature
32 to 122°F (0 to 50°C)
Storage
temperature
14 to 122°F (–10 to 50°C)
Weight 6.2 oz (177 g)
Dimensions 63⁄8" x 21⁄2" x 11⁄8" (16.2 x 6.4 x 2.9 cm)
Power Three AAA batteries

19
Maintenance, Recalibration, and Repair
Cleaning and Storage
• The meter should be cleaned with a damp cloth and
mild detergent when necessary. Do not use solvents
or abrasives.
• Store the meter in an area with moderate temperature
and humidity (refer to the operating and storage
ranges in the "Specifications" on page 18).
Phone: 1-866-INNOCAL (1-866-466-6225)
Fax: [phone]
E-mail: [email protected]
Web: InnoCalSolutions.com
Battery Replacement
When the battery power falls low, the low-battery icon will
appear on the screen. Replace the three AAA batteries by
removing the screw holding the rear battery compart-
ment cover to access the battery compartment. Ensure
that the compartment cover is securely fastened when
finished. Note: If you do not intend to use the meter for
a long time, remove the batteries.
It is recommended that Digi-Sense products are
calibrated annually to ensure proper function and
accurate measurements; however, your quality system
or regulatory body may require more frequent calibra-
tions. To schedule your recalibration, please contact
InnoCal, an ISO 17025 calibration laboratory accredited
by A2LA.

For Product and Ordering Information, Contact:
Toll-Free: 1-800-358-5525
Phone: [phone]
Fax: [phone]
Davis.com/Digi-Sense
1065DGMAN_20250-02 Rev.1
Manual Part No. 00100-34