Digi-Sense 20250-01 User manual

User Manual

THE STANDARD IN PRECISION MEASUREMENT

Thermocouple Thermometer
with Single Type K/J Input

with NIST-Traceable Calibration

Model 20250-01

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Introduction

The Digi-Sense Thermocouple Thermometer with Single
Type K/J Input (Model 20250-01) offers fast response and
high accuracy. This thermometer works with one type K or
J thermocouple sensor. Advanced features include relative
time clock, offset compensation, data Hold, Max/Min/Avg
readings, and automatic 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. One flexible type K thermocouple probe

3. Three AAA batteries

4. User manual

5. NIST-traceable calibration report with data

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Key Features

• Large backlit display

• 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

• User-selectable readout in °C, °F, or Kelvin (K)

• Automatic power-off (sleep) mode to conserve battery life

• Accepts a wide variety of thermocouple type K and J
probes

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Meter Description

1. Temperature sensor input

2. LCD

3. Power on/off button

4. Enter button

5. Set button

6. °C/°F/K button

7.  (Up)/Hold button

8. Max/Min/(Down) button

9.

Backlight button

1

4

5

6

3

4

2

7

8

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Display Layout

1. Setup mode icon

2. Offset option

3. Hold icon

4. Auto power-off icon

5. Primary temperature

display

6. User-selectable

temperature units
(°C/°F/K)

1

12

7. Secondary display
(Max, Min, Avg, or
offset)

8. MAX, MIN, AVG icons

9. Time display

10. Time icon (hour:min
or min:sec)

11. Thermocouple type
icon (K or J)

12. Low-battery indicator

2

3 4

5

6

7

8

9

11

10

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Setup and Operation

1. Press Power on/off button to turn the unit on.

2. When thermometer is in Setup mode, press Enter
button to enter a setup option and press Enter
button again to store the displayed setting in
memory.

3. Press Set button to enter or exit Setup mode.
(See "Changing Setup Options" on page 7.)

4. Press °C/°F/°K button to switch between Celsius
(°C), Fahrenheit (°F), and Kelvin (K).

5. Press /Hold button to freeze or unfreeze the
displayed readings. When the thermometer is in
Setup mode, press /Hold button to scroll to the
Setup option you want to change or press /Hold
button to increase the displayed setting.

6. Press Max/Min/ button to step through the
maximum, minimum, and average of the logged
readings. When reading, the screen will indicate
the MAX, MIN, or AVG icon. To exit the Max/Min/
Avg mode, press and hold Max/Min/ button for
three seconds to return to normal operation. When
the thermometer is in Setup mode, press
Max/Min/ button to scroll to the Setup option
you want to change or press Max/Min/ button
to decrease the displayed setting.

7. Press Backlight button to the backlight on or off.

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Setup Mode

Use Setup mode to change offset and sleep mode settings.
The thermometer stores the settings in its memory.

Option Menu item Settings
Type TYPE K or J
Offset OFFSET Offset range –9 to 9°F (–5 to 5°C)

Sleep mode SLP

Entering or Exiting Setup Mode

When the thermometer is in Setup mode, the display
shows the SETUP icon. Press Set button to enter or exit
the Setup mode.

Changing Setup Options

1. Press /Hold button or Max/Min/ button to scroll to
the setup option you want to change.

2. Press Enter button to indicate that you want to change
this setting.

3. Press /Hold button or Max/Min/ button until the
setting you want to use appears on the display.

4. Press Enter button to store the new setting in memory.

Note: Setup is disabled in MAX/MIN mode.

On (sleep mode on)
Off (sleep mode off)

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Setup Mode (continued)

Offset Function

The primary display shows the
temperature plus the offset and
the secondary display shows
the offset.

1. When the thermometer is in
Setup mode, the display
shows the SETUP icon.

2. Press /Hold button or
Max/Min/ button to scroll
to the OFFSET setup option
page (see Fig. 1).

3. Press Enter button to indicate
the offset in the secondary display.

4. Press /Hold button or Max/Min/ button until the
value you want to use appears on the display.

5. Press Enter button to store the new setting
into memory.

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).

Fig. 1

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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 7.)

Auto Power-Off (APO) Mode

The meter’s default mode is to automatically shut off
after 20 minutes of non-use. To disable the auto power­off mode, enter the Setup mode.

1. While in Setup mode, press
/Hold button or Max/Min/
button to scroll to the “SLP” option
screen (see Fig. 2).

2. Press ENTER button to display “On.”

3. Use the /Hold button or
Max/Min/ button to toggle
between “On” (sleep mode on)
or “Off” (sleep mode off).

Note: Mode defaults back to “On”
once meter is powered off.

Fig. 2

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Measuring Temperatures

1. Plug the thermocouple into the T1 input connector.
Make sure that the polarity is correct.

2. Press power on/off button to turn on the thermometer.
After one second the thermometer displays the first
reading. 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 Setup menu.

4. Press °C/°F/K button to select the desired
temperature scale.

Hold Function

1. Press /Hold button to freeze the readings on the
display. The display shows the HOLD icon.

2. Press /Hold button again to turn off the Hold
function.

Min/Max/Avg Function

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 3 seconds
to exit Max/Min mode.

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Specifications

Range

Type K thermocouple –328 to 2501°F (–200 to 1372°C)
Type J thermocouple –346 to 2012°F (–210 to 1100°C)

Resolution

Temperature display 0.1 below 1000 or 1 above 1000

Accuracy

Temperature above –148°F (–100°C) ±[0.5% rdg + 1.8°F (1°C)]
Temperature below –148°F (–100°C) ±[0.5% rdg + 3.6°F (2°C)]

Auto power-off Unit shuts off automatically after

Operating
temperature

Storage
temperature

Weight 6.2 oz (177 g)

Dimensions 6

Power Three AAA batteries

20 minutes to preserve battery life

32 to 122°F (0 to 50°C)

14 to 122°F (–10 to 50°C)

3

⁄8" x 21⁄2" x 11⁄8" (16.2 x 6.4 x 2.9 cm)

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).

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Maintenance, Recalibration, and
Repair (continued)

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

measurements; 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.

For Product and Ordering Information, Contact:

1065DGMAN_20250-01 Rev.1

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Manual Part No. 00100-32