Digi-Sense 20250-18 User manual

User Manual

Professional Thermocouple Thermometer
with Single Type K Input
and Optional Infrared Wand

with NIST-Traceable Calibration

Model 20250-18

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THE STANDARD IN PRECISION MEASUREMENT

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Introduction

The Digi-Sense Professional Thermocouple Thermometer
(Model 20250-18) with Single Type K Input and Optional Infrared Wand
offers fast response and high accuracy. This heavy-duty meter works with
one type K thermocouple (supplied) and one optional infrared probe*.
Advanced features include backlight, Max/Min/Avg readings, data Hold,
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 type K flexible probe

3. Carrying case

4. One 9 V battery

5. User manual

6. NIST-traceable calibration report with data

*Optional infrared wand (model 20250-24) must be ordered separately.

Key Features

• Large backlit display shows any combination of T1, T2, T1–T2
(temperature differential); plus Min, Max, and Avg readings

• Relative time clock on Min, Max, and 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)

• 0.1°C / 0.1°F / 0.1 K resolution

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

• Accepts a wide variety of thermocouple type K probes

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Meter Description

1. Thermocouple type K (T1) input

2. LCD

3. Enter button

4. Up  button

5. HOLD buttonon

6. Power on/off button

7. DIF/T1–T2 button

8. MAX/MIN button

9. °C/°F/K button

10. Down  button

11. Setup /

Backlight button

12. IR (T2) input*

*Optional infrared wand (model
20250-24) must be ordered separately.

Display Layout

1. Thermocouple TYPE K icon

2. Infrared IR TEMP icon (requires

Optional IR wand sku number
20250-24)

3. Data HOLD icon

4. SETUP mode icon

5. Primary temperature display

6. Secondary display (Min/Max/Avg

or offset)

7. Temperature unit icons (°C, °F, K)

8. Tertiary display (elapsed time or

T1, T2 reading)

9. Low-battery indicator

10. Elapsed time (hour:min or min:sec)

11. MAX, MIN, AVG icons

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Setup and Operation

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

Using Thermocouple Input

1. Plug the type K thermocouple into the T1 input connector.

2. After one second the thermometer displays the first reading. If no thermocouple is

plugged into the selected input or the thermocouple is not properly connected,
the display will show "- - - -". If the temperature being measured is outside the
unit’s valid range, the display will show “OL” (overload).

Using Infrared Input

1. Purchase optional infrared wand (model 20250-24).

2. Plug the IR wand into the T2 (IR input) connector. “T2 - - - -” will show on

screen. If the IR wand is not connected, “T2 - - - -” is not shown on the screen.

3. Press the SCAN button on the IR wand to begin measuring.

Optional IR wand
(model 20250-24)

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Displaying Temperatures

1. Press °C/°F/K button to select desired temperature unit: Celsius (°C),

Fahrenheit (°F), or Kelvin (K).

2. The T1 temperature reading appears in the primary display. Use the DIF/T1–T2

button to toggle between showing the T1 (type K), T2 (infrared), and T1–T2
(temperature differential) measurement in the primary, secondary, or tertiary
display.

Hold Function

1. Press HOLD button to freeze the readings on the display. The screen shows

the HOLD icon.

2. Press DIF/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, and AVG Function

1. Press MAX/MIN button to step through the maximum (MAX), minimum (MIN),

and average (AVG) readings. The elapsed time since entering Min/Max/Avg
mode, or the time at which the minimum or maximum occurred, appears on
the display.

2. Press and hold the MAX/MIN button for three seconds to exit the

Max/Min/Avg mode and return to normal operation.

Backlight Function

Quickly press the Setup/Backlight button to turn the backlight on and off.

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Setup Options

Use the Setup mode to change the temperature offset and sleep mode settings.

Note: Setup mode is disabled in Max, Min, and Avg modes.

Changing a Setup Option

1. Press and hold Setup/Backlight button for three seconds to enter or exit Setup

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

2. Press Up  or Down  button to scroll to the setup option you want to change.

3. Press ENTER button to indicate that you want to change this setting.

4. Press Up  or Down  button until the setting you want to use appears

on the display.

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

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.

Use the Offset option in the Setup mode to adjust the thermometer’s readings to
compensate for the errors of a specific thermocouple and IR temperature. The
allowable adjustment range is ±9.0°F or ±5.0°C.

1. Plug the thermocouple into the T1 input connector.

2. Place the thermocouple in a known, stable temperature environment

(such as an ice dry well calibrator).

3. Allow the readings to stabilize.

4. While in Setup mode, press the Up  or Down  button to scroll to the

“T1” screen.

5. Press Enter button to access the setting.

6. Use the Up  and Down  buttons to change the offset value until the

primary reading matches the calibration temperature.

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

Changing the 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 power-off mode, enter the Setup mode.

1. While in Setup mode, press Up  or Down  button to scroll to the

“SLP” screen.

2. Press ENTER button to display “On.”

3. Use the Up  or Down  buttons to toggle between “On” (sleep mode on)

or “Off” (sleep mode off).

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

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

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Specifications

Range

Temperature,
external type K
thermocouple

Resolution

Temperature display 0.1 (<1000) or 1 (≥1000)

Accuracy

T1 (T/C)

T2 (IR)

T1 (T/C)–T2 (IR)

–328 to 2501°F (–200 to 1372°C)

T1 above –148°F (–100°C) ±[0.15% reading + 1.8°F (1°C)]

T1 below –148°F (–100°C) ±[0.5% reading + 3.6°F (2°C)]

T2 above 14°F (–10°C) ±[2.0% reading + 3.6°F (2°C)]

T2 below 14°F (–10°C) ±9°F (5°C)

T2 above 14°F (–10°C) ±[2.0% reading + 5.4°F (3°C)]

T2 below 14°F (–10°C) ±11°F (6°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 9.8 oz (280 g)

Dimensions 8" x 3" x 2" (20.1 x 7.5 x 5 cm)

Power One 9 V battery

Optional Infrared Wand (Model 20250-24)

Temperature range –31 to 1022°F (–35 to 550°C)

Resolution 1 mV per °F/°C

Basic accuracy ±2% or ±4°F (2°C)

Response time Less than 500 ms

Optical resolution
(Distance-to-Spot ratio)

Plug diameter Banana plug: 0.16" (4 mm)

Dimension 6

Power One 9 V battery

Unit shuts off automatically after 20 minutes to preserve
battery lif

8:1

1

⁄2" x 2" x 11⁄2" (16.4 x 5 x 4 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 within the storage range indicated in the
Specifications on page 7.

Battery Replacement

When the battery power falls low, the low-battery icon will appear on the screen.
Replace the 9 V battery in the rear battery compartment by removing the cover.
Ensure that the cover is securely refastened when finished,

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.

1065DGMAN_20250-18 Rev.1

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Manual Part No. 00100-57