User Manual
Professional Thermocouple Thermometer
with Dual Type K Inputs
and Optional Infrared Wand
with NIST-Traceable Calibration
Model 20250-17
Enter
REC
DIF
THE STANDARD IN PRECISION MEASUREMENT
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Introduction
The Digi-Sense Professional Thermocouple Thermometer (Model 20250-17) with
Dual Type K Inputs and Optional Infrared Wand offers fast response and high
accuracy. This heavy-duty meter works with two type K thermocouples 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. Two type K flexible probes
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, T3, T1–T2,
T1–T3, T2–T3; 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
• User-selectable readout in °C, °F, or Kelvin (K)
• 0.1°C / 0.1°F / 0.1 K resolution
• Scan function (T1, T2, T2, T1–T2, etc.)
• 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. Thermocouple type K (T2) input
3. LCD
4. Enter button
5. Up button
6. Down button
7. Power on/off button
8. Setup /
Backlight button
9. °C/°F/K button
10. MAX/MIN button
11. HOLD button
12. DIF/T1–T2–T3 button
13. IR (T3) input*
* Optional infrared wand (model
20250-24) must be ordered
separately.
Display Layout
1
13
8
9
10
12
2
3
Enter
REC
DIF
4
5
6
11
7
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 (T1,
T2, T3, T1–T2, T1–T3, or T2–T3
reading)
6. Secondary display (Max, Min, Avg,
or offset T1, T2, T3 reading)
7. Temperature unit icons (°C, °F, K)
8. Tertiary display (elapsed time or
T1, T2, T3 reading)
9. Low-battery indicator
10. Elapsed time (hour:min or min:sec)
11. MAX, MIN, AVG icons
1 2 3 4
5
6
7
11
8
9
10
3
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Setup and Operation
1. Press the Power on/off button to turn unit on.
Using Thermocouple Input(s)
1. Plug the type K thermocouples into the T1 and T2 input
connectors.
2. After one second the thermometer displays the first
readings (T1 on upper display, T2 on secondary display). 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 T3 (IR) input connector.
“T3 - - - -” will show on screen. If the IR wand is not
connected, “T3 - - - -” is not shown on the screen.
3. Press the SCAN button on the IR wand to begin
measuring. The IR (T3) measurement is shown on
the tertiary display.
Displaying Temperatures
1. Press °C/°F/K button to select desired temperature unit:
Celsius (°C), Fahrenheit (°F), or Kelvin (K).
2. As a default, the T1 temperature reading appears in
the primary display, the T2 reading in the secondary
display, the T3 reading in the tertiary display.
3. Use the DIF/T1–T2–T3 button to toggle between
showing the T1 (type K), T2 (type K), T3 (infrared),
T1–T2, T1–T3, T2–T3 (temperature differentials)
measurement in the primary, secondary, or
tertiary display.
Optional IR wand
(model 20250-24)
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Hold Function
1. Press HOLD button to freeze the readings on the display. The screen shows the
HOLD icon.
2. Use the DIF/T1–T2–T3 button to toggle between showing the T1 (type K), T2
(type K), T3 (infrared), and T1–T2, T1–T3, T2–T3 (temperature differentials)
measurement in the primary, secondary, or tertiary display.
3. Press HOLD button again to turn off the HOLD function and resume measuring.
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 Max/Min/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, T3.
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, T2 (T/C)
T1–T2 (T/C) ±[0.5% reading + 1.8°F (1°C)]
T3 (IR) ±[2.0% reading + 3.6°F (2°C)]
T1 (T/C) – T3 (IR) ±[2.0% reading + 5.4°F (3°C)]
T2 (T/C) – T3 (IR) ±[2.0% reading + 5.4°F (3°C)]
–328 to 2501°F (–200 to 1372°C)
±[0.15% reading + 1.8°F (1°C)] above –148°F (–100°C)
±[0.5% reading + 3.6°F (2°C)] below –148°F (–100°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 life
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_20250-17 Rev.1
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Manual Part No. 00100-56
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