Digi-Sense 20250-03 User manual

User Manual

THE STANDARD IN PRECISION MEASUREMENT

Thermocouple Thermometer
with Four Type K/J Inputs
and Data Logging

with NIST-Traceable Calibration

Model 20250-03

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Introduction

The Digi-Sense Thermocouple Thermometer with Four
Inputs and Data Logging (Model 20250-03) offers fast
response and high accuracy. This thermometer accepts
four 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.

1. Meter

2. Four type K flexible probes

3. USB cable

4. Software

5. Three AAA batteries

6. User manual

7. NIST-traceable calibration report with data

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Key Features

• Large backlit display shows any combination of T1, T2,
T1–T2, T3, T4, T3–T4; 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 to conserve battery life

• Four sensor inputs; accepts a wide variety of type K and
type J thermocouple probes

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Meter Description

1. Temperature sensor inputs (4)

2. LCD

3. SET /

4. (Up)/T1–T2/T3–T4 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

backlight button

1

2

3

4

6

9

4

5

8

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Display Layout

1. T1, T2, T1–T2, T3, T4,

and T3–T4 icons

2. HOLD icon

3. Auto power-off icon

4. Primary temperature

display

5. User-selectable

temperature units
(°C/°F/K)

6. Secondary display

(Max, Min, Avg,
Offset, or T1 to
T4 readings)

7. MAX, MIN, AVG icons

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)

1 2 3

4

5

6

14
13

12

11

10

9

7

8

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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/T3–T4 button to toggle showing

the T1, T2, and T1–T2 (differential temperature)
measurements or the T3, T4, and T3–T4 (differential
temperature) measurements in the primary and
secondary displays. Press and hold /T1–T2/T3–T4
button for three seconds to toggle showing the T1,
T2, T3, or T4 values in the primary and secondary
displays. When the meter is in Setup mode, press
/T1–T2/T3–T4 button to scroll to the Setup option
you want to change or press /T1–T2/T3–T4 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 dis-

played 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.

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6. Press /Max/Min button to step through the

maximum, minimum, and average readings.
To exit the Max/Min/Avg mode, press and hold
/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, APO/Sleep Mode" on
page 12.)

Setup Mode

Use the Setup mode to change offset, sample rate,
time, clear data logging memory, and sleep mode
settings. The meter stores the settings into its memory.

Option Menu item Settings

Offset T1, T2, T3, T4 T1 , T2, T3, T4 offset

Sample rate rAt Sampling of recording

Time setting tiE Show the time or set the time

Clear data logging
memory

Sleep mode SLP On (sleep mode on)

CLR Clear the memory operation

OFF (sleep mode off)

Entering or Exiting Setup Mode

When the meter 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.

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Changing Setup Options

1. Press /T1–T2/T3–T4 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/T3–T4 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.

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, T2, T3, and T4.

1. When the meter is in Setup mode,
the display shows the SETUP icon.
Press /T1–T2/T3–T4 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. Use /T1–T2/T3–T4 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 and continue to T2, T3, and T4 offsets.

Fig.1

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Using the Offset to Adjust for Probe Errors

Use the offset option in the Setup mode to adjust the
meter’s readings to compensate for the errors of a
specific thermocouple. The allowable adjustment
range is ±9.00°F or ±5.00°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" on page 8.)

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/T3–T4 and
Hold/ buttons to scroll to the
rAt option screen (Fig. 2).

3. Press Rec/Enter button to access
the “00:01” (minute, second)
value shown in the tertiary
display (Fig. 2).

4. Press /Max/Min button until the
minute value is flashing. Use the
/ T1–T2/T3–T4 and Hold/ but­tons to set the desired value.

Fig. 2

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Sample Rate of Data Recording (continued)

5. Press /Max/Min button again until the second
value is flashing. Use the /T1–T2/T3–T4 and
Hold/ buttons to set the desired value.

6. Press Rec/Enter button to store the new setting into
memory.

7. Note: When the meter is powered
down, the default sample rate is
the last setting.

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/T3–T4 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/T3–T4 and Hold/ buttons

to set the desired value.

5. Press /Max/Min button again
until the month value is flashing.
Use the /T1–T2/T3–T4 and
Hold/ buttons to set the desired
value.

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Fig. 3

Fig. 4

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6. Press /Max/Min button again until the day value
is flashing. Use the / T1–T2/T3–T4 and Hold/
buttons to set the desired value.

7. Press /Max/Min button again until the hour value
is flashing. Use the / T1–T2/T3–T4 and Hold/
buttons to set the desired value.

8. Press /Max/Min button again until the minute
value is flashing. Use the / T1–T2/T3–T4 and
Hold/ buttons to set the desired value.

9. Press Rec/Enter button to store the new setting into
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.

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/T3–T4 and Hold/
buttons to scroll to the CLR memory
option screen (Fig. 5). The screen
indicates the number of sample
points remaining.

Fig. 5 Screen shows

17,985 readings left

in memory.

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Clear Memory Operation (continued)

3. Press Rec/Enter button and “No” appears on the
screen. (Fig. 5)

4. Press / T1–T2/T3–T4 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.

Auto Power-Off (APO)/Sleep Mode

The meter’s default mode is to automatically shut off
after 15 minutes of non-use. To disable the auto power­off mode, enter the Setup mode.

1. While in Setup mode, press
/T1–T2/T3–T4 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/T3–T4 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.

Fig. 6

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Measuring Temperatures

1. Plug the thermocouple(s) into the T1, T2, T3, or T4
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
logging 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
temperature 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
temperature scale (°C, °F, or K).

5. Press /T1–T2/T3–T4 button to toggle between
showing the T1, T2, and T1–T2 readings in the
primary or secondary display.

6. Press and hold /T1–T2/T3–T4 button for three
seconds to bring up the T3, T4, and T3–T4 read­ings. Then press /T1–T2/T3–T4 button again to
toggle between showing the T3, T4, and T3–T4
readings in the primary or secondary display.

7. Press and hold /T1–T2/T3–T4 button for three
seconds to return to the T1, T2, and T1–T2
readings.

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Hold Function

1. Press Hold/ button to freeze the readings on the

display. The display shows the HOLD icon.

2. Press /T1–T2/T3–T4 button to toggle between

showing the T1, T2, and T1–T2 readings in the
primary or secondary display.

3. Press and hold /T1–T2/T3–T4 button for three

seconds to bring up the T3, T4, and T3–T4 read­ings. Then press /T1–T2/T3–T4 button again to
toggle between showing the T3, T4, and T3–T4
readings in the primary or secondary display.

4. Press and hold /T1–T2/T3–T4 button for

three seconds to return to the T1, T2, and T1–T2
readings.

5. 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.

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Recording/Data Logging Operation (Meter)

1. Press Power on/off button to turn the unit on. The
first value immediately 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 sample
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" on
pages 11–12.)

Fig. 7 Screen shows
18,000 readings left

in memory.

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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 dis­played on the screen. This will indicate that recording
function has been activated. Upon completion of desired
data logging of measurements, press and hold Rec/Enter
button for three seconds until the REC icon disappears
from the screen, indicating data logging has been
deactivated.

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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
summary information as captured on the “Data
Summary” tab.

12. To print recorded data, simply select the “print” icon

on the menu bar.

®

format that will include all

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.

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Specifications

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, T3, T4 temperatures
above –148°F (–100°C)

T1, T2, T3, T4 temperatures
below –148°F (–100°C)

T1–T2, T3–T4 temperature
differentials

±[0.5% rdg + 1.8°F (1°C)]

±[0.5% rdg + 3.6°F (2°C)]

±[0.5% rdg + 3.6°F (2°C)]

Auto power-off

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 6

Power Three AAA batteries

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Unit shuts off automatically after 15 minutes to
preserve battery life

1

⁄2" x 21⁄2" x 11⁄8" (16.5 x 6.4 x 2.9 cm)

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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 chart earlier in this manual).

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 compartment
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 measure-

ments; however, your quality system or regulatory body
may require more frequent calibrations. To schedule your
recalibration, please contact InnoCal, an ISO 17025 calibra­tion laboratory accredited by A2LA.

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